DP Chemistry (first assessment 2025)

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Question 21M.1A.SL.TZ2.14

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.SL.TZ2.14
Level	SL	Paper	1A	Time zone	TZ2
Command term	Derive	Question number	14	Adapted from	N/A

14.

[Maximum mark: 1]

21M.1A.SL.TZ2.14

What is the heat change, in kJ, when 100.0 g of aluminium is heated from 19.0 °C to 32.0 °C?

Specific heat capacity of aluminium: 0.90 J g⁻¹K⁻¹

A. $0.90 \times 100.0 \times 13.0$

B. $0.90 \times 100.0 \times 286$

C. $\frac{0.90 \times 100.0 \times 13.0}{1000}$

D. $\frac{0.90 \times 100.0 \times 286}{1000}$

[1]

Markscheme

C

Syllabus sections

Reactivity 1. What drives chemical reactions? » Reactivity 1.1—Measuring enthalpy changes » Reactivity 1.1.4—The standard enthalpy change for a chemical reaction, ΔH⦵, refers to the heat transferred at constant pressure under standard conditions and states. It can be determined from the change in temperature of a pure substance. Apply the equations Q = mcΔT and ΔH = − Qn in the calculation of the enthalpy change of a reaction.