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Physics

Edexcel2024

A film involves a gang of bank robbers making a getaway on a bus loaded with gold bars. The bus spins out of control and ends up balancing on the edge of a cliff, as shown. (Source: © maforche/Shutterstock) (a) State what is meant by the moment of a force about a point. (1) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (b) The bus is balanced on a pivot that is a distance y from the centre of the bus. The centre of mass of the gold is 1.5 m from one end of the bus. The centre of mass of the bank robbers is 1.0 m from the other end of the bus, as shown.

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Physics

Edexcel2023

5 m support rod Y column The masses of support rods X and Y are negligible. (a) (i) Determine, by taking moments, the force exerted on rod X by rod Y. (4) .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. Force = ..............................................................

Question

Mathematics

Edexcel2019

The standard molar enthalpy change of neutralisation is the enthalpy change when an acid and an alkali react under standard conditions to form one mole of water. (a) An experiment was carried out to determine the enthalpy change of neutralisation for the reaction between propanoic acid and sodium hydroxide. The equation for this reaction is CH CH COOH(aq) + NaOH(aq) (cid:111) CH CH COO–Na+(aq) + H O(l)

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Mathematics

Edexcel2019

2 3 2 2

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Mathematics

Edexcel2019

2 4 Deduce two ionic equations to show how cobalt(II) ions catalyse the reaction in acidic solution. State symbols are not required. (2)

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Mathematics

Edexcel2019

Draw the dot-and-cross diagrams of these ions. Use dots ( • ) for the hydrogen electrons and crosses (×) for the oxygen electrons. (2)

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Mathematics

Edexcel2019

4 2 2 The K expression for this equilibrium is c (1) [Fe]×[H O] A K = 2 c [Fe O ]×[H ]

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Mathematics

Edexcel2019

4 2 [Fe]3 ×[H O]4 B K = 2 c [Fe O ]×[H ]4

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Mathematics

Edexcel2019

4 2 [H O] C K = 2 c [H ]

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Mathematics

Edexcel2019

*P58306A0328* Turn over AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD AERA SIHT NI ETIRW TON OD PMT (c) The total number of electrons in all the occupied p orbitals in a chloride ion, Cl–, is (1) A 5 B 6 C 12 D 18 (d) Which of these isoelectronic ions has the largest ionic radius? (1) A N 3– B O 2– C Na + D A l3+ (Total for Question 1 = 4 marks)

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