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Physics

CAIE2024

(cid:44)(cid:1)(cid:1)(cid:1)(cid:1)(cid:9)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:1)(cid:2)(cid:10)(cid:44) (iii) Determine the root‑mean‑square (r.m.s.) current in the resistor. r.m.s. current = ....................................................... A [1] (c) Use data from (b), including your answer in (b)(iii), to show by calculation that the mean power in the 680 Ω resistor is half of the peak power. [3] [Total: 9] © UCLES 2024 (cid:300) (cid:300) (cid:207) (cid:236) (cid:266) (cid:185) (cid:190) (cid:249) (cid:288) (cid:207) (cid:180) (cid:293) (cid:237) (cid:292) (cid:200) (cid:268) (cid:245) (cid:221) (cid:207) (cid:245) (cid:298) (cid:248) (cid:197) (cid:300) (cid:266) (cid:203) (cid:222) (cid:179) (cid:249) (cid:178) (cid:183) (cid:241) (cid:258) (cid:272) (cid:215) (cid:258) 9702/42/O/N/24 [Turn over (cid:293)(cid:277)(cid:229)(cid:213)(cid:181)(cid:245)(cid:229)(cid:213)(cid:293)(cid:277)(cid:293)(cid:197)(cid:261)(cid:245)(cid:261)(cid:245)(cid:197)(cid:213) NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD NIGRAM SIHT NI ETIRW TON OD PMT * 0000800000020 *

Question

Physics

Edexcel2024

Impulse W = QV

Question

Physics

Edexcel2023

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Question

Physics

CAIE2023

A battery of e.m.f. 12 V and internal resistance 0.5 Ω is connected to an external resistor of 4.5 Ω. (a) Calculate the current in the circuit. (b) Calculate the terminal potential difference of the battery. (c) Calculate the power dissipated in the external resistor. (d) State and explain what happens to the terminal p.d. as the external resistance is decreased.

[7 marks]

Physics

Edexcel2023

Overhead electricity cables for railway lines are supported by structures like the one shown. An electric cable of mass 45 kg is suspended from a support rod X. A second support rod Y is attached to X. X and Y are attached at one end to a column. support rod X

Question

Physics

Edexcel2023

005 0.01 0.015 0.02 0.025 0.03 –2 t / s –4 –6 (a) (i) Calculate the root‑mean‑square potential difference. (1) .................................................................................................................................................................................................................................................. Root‑mean‑square potential difference = .............................................................. (ii) The formula used to generate this graph is V = 5 sin (100 πt) Explain why this formula leads to the graph above. (3) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. ..................................................................................................................................................................................................................................................

Question

Physics

Edexcel2023

An electrical conductor XY carries a current I as shown. I X Y I The current density j is defined as j = where A is the cross‑sectional area of A the conductor. (a) Current density is a vector quantity. State what is meant by a vector quantity. (1) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (b) I is constant but A decreases towards end Y. Explain how this affects the drift velocity of the free electrons in the conductor. (2) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. ..................................................................................................................................................................................................................................................

Question

Physics

Edexcel2023

7 V. This should happen as the light level reaching the LDR increases above 30 lux.

Question

Physics

Edexcel2023

*P71915A0928*  Turn over DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD PMT E (c) The resistivity ρ of the conducting material is given by ρ = j where E is the electric field strength. Show that the units are the same on both sides of this equation. (4) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (Total for Question 12 = 7 marks) *P71915A01028* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD PMT

Question

Physics

Edexcel2023

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Question

Mathematics

Edexcel2022

*P67093RA01132* Turn over PMT (ii) Which of these substances has a high melting temperature, and conducts electricity when solid and when molten? (1) A Substance P B Substance Q C Substance R D Substance S 

Question

Physics

Edexcel2022

Impulse W = QV

Question

Mathematics

Edexcel2022

*P67093RA0232* PMT Answer ALL questions. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross .

Question

Mathematics

Edexcel2022

This question is about the elements in Group 2 of the Periodic Table. (a) Magnesium powder is added to a beaker of water containing a few drops of Universal Indicator. The apparatus is set up as shown and allowed to stand for a few days. test tube filled with water water and Universal Indicator filter funnel magnesium powder State two changes that will be seen after a few days. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (b) Explain how the trend in the reactivity of the Group 2 elements is determined by their electronic configurations. (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 

Question

Mathematics

Edexcel2022

2 Explain, in terms of electrons, why this is a redox reaction. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (d) An experiment was carried out to determine the molar volume of hydrogen at room temperature.

Question

Mathematics

Edexcel2022

2 Calculate the molar volume of hydrogen from the results of this experiment. Include units in your answer. (2) (Total for Question 2 = 9 marks) 

Question

Mathematics

Edexcel2022

2 B Br (aq) + 2NaF(aq) → 2NaBr(aq) + F (aq)

Question

Mathematics

Edexcel2022

2 C Cl (aq) + 2NaBr(aq) → 2NaCl(aq) + Br (aq)

Question

Mathematics

Edexcel2022

2 D Cl (aq) + 2NaF(aq) → 2NaCl(aq) + F (aq)

Question

Mathematics

Edexcel2022

2 (c) The halogens can form halide ions during reactions. Complete the electronic configuration of the chloride ion. (1) 1s2 ....................................................................................................................................... 

Question

Mathematics

Edexcel2022

2HOBr(aq) + 2H+(aq) + 2e–  Br (aq) + 2H O(l) Ed = +1.57 V

Question

Mathematics

Edexcel2022

2 (i) Explain why the disproportionation of bromine in water is not thermodynamically feasible under standard conditions. Include the overall equation for the disproportionation and its Ed value. cell (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) Bromine disproportionates in water to a small extent at 298 K. Give a possible reason why this reaction occurs. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 

Question

Mathematics

Edexcel2022

though it has fewer electrons in its molecules • the density of ice at 0 °C is less than that of water at 0 °C. Explain these properties. You should include a labelled diagram to show the intermolecular forces between two molecules of water. (6) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 

Question

Mathematics

Edexcel2022

3 (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 

Question

Mathematics

Edexcel2022

3 3 

Question

Mathematics

Edexcel2022

2 (c) Lead-acid batteries are used as storage cells in some cars. The electrolyte is sulfuric acid, one electrode is lead and the other is lead(IV) oxide, PbO .

Question

Mathematics

Edexcel2022

As the cell discharges, the lead and the lead(IV) oxide are both converted to solid lead(II) sulfate, PbSO , and the concentration of the sulfuric acid decreases.

Question

Mathematics

Edexcel2022

7 2 (i) Write the overall equation for the reduction of dichromate(VI) ions to chromium(III) ions by zinc in acid conditions. State symbols are not required. (2) (ii) Calculate Ed for the reaction in (c)(i). cell (1) (iii) Predict whether or not a further reduction of chromium(III) ions to chromium(II) ions will occur. Justify your answer. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 

Question

Mathematics

Edexcel2022

7 2 Determine, using the experimental data, the brand of nail that was analysed. (5) 

Question

Mathematics

Edexcel2022

2 B 2H (g) + 2O (g) + 4e– → 4OH – (aq)

Question

Mathematics

Edexcel2022

2 C 4OH – (aq) → 2H (g) + 2O (g) + 4e–

Question

Mathematics

Edexcel2022

2 D 2H O(l) → 4H + (aq) + O (g) + 4e–

Question

Physics

Edexcel2021

Question

Physics

Edexcel2021

Which of the following is the current I in ampere? A 3.0 B 4.0 C 5.0 D 6.0 (Total for Question 4 = 1 mark)

Question

Physics

Edexcel2020

Impulse W = QV

Question

Mathematics

Edexcel2017

(i) Give a reason why the partial pressure of carbon is not included in the expression. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (ii) Explain the effect of an increase in pressure on the equilibrium position of this reaction. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (iii) Explain, by reference to any change in the value of K , the effect of an increase p in temperature on the equilibrium position of this reaction. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... ....................................................................................................................................................................................................................................................................................

Question

Mathematics

Edexcel2017

2 2 At 1100 K, K = 1.00 c In an experiment, 1 mol of carbon monoxide was mixed with 1 mol of steam,

Question

Mathematics

Edexcel2017

mol of carbon dioxide and 2 mol of hydrogen. Deduce, with reasons, the direction in which the reaction will shift to reach equilibrium. (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (Total for Question 10 = 12 marks) TOTAL FOR PAPER = 90 MARKS

Question

Mathematics

Edexcel2017

MnO (s) + 4H+(aq) + 2e– (cid:85) Mn2+(aq) + 2H O(l) +1.23

Question

Mathematics

Edexcel2017

2 Cl (aq) + 2e– (cid:85) 2Cl–(aq) +1.36

Question

Mathematics

Edexcel2017

MnO–(aq) + 8H+(aq) + 5e– (cid:85) Mn2+(aq) + 4H O(l) +1.51

Question

Mathematics

Edexcel2017

*P48058A0228* DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA Answer ALL questions. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then mark your new answer with a cross .

Question

Mathematics

Edexcel2017

Magnesium nitrate decomposes on heating as shown by the equation. 2Mg(NO ) (cid:114) 2MgO + 4NO + O

Question

Mathematics

Edexcel2017

Fe3+(aq) + e– (cid:85) Fe2+(aq) +0.77 Br (aq) + 2e– (cid:85) 2Br –(aq) +1.09

Question

Mathematics

Edexcel2017

B C l–(aq) C I (aq)

Question

Mathematics

Edexcel2017

D Mn 2+(aq) (ii) Write the ionic equation and calculate the E value for the reaction between cell MnO– ions and Br – ions in acidic solution.

Question

Mathematics

Edexcel2017

6 2 6 form a colourless solution. Explain why zinc ions are colourless. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (c) Hydrated iron(II) ions react with ethanedioate ions, C O2–, to form a complex ion.

Question

Mathematics

Edexcel2017

4 [Fe(H O) ]2+ + 2C O2– (cid:85) [Fe(C O ) (H O) ]2– + 4H O

Question

Mathematics

Edexcel2017

6 2 4 2 4 2 2 2 2 (i) Draw a structure of the [Fe(C O ) (H O) ]2– ion, showing all of the bonds.

Question

Mathematics

Edexcel2017

4 2 2 2 (2)

Question