DP Chemistry (first assessment 2025)

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Question 21M.2.SL.TZ1.c

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.2.SL.TZ1.c
Level	SL	Paper	2	Time zone	TZ1
Command term	Determine	Question number	c	Adapted from	N/A

c.

[Maximum mark: 1]

21M.2.SL.TZ1.c

Iron has a relatively small specific heat capacity; the temperature of a 50 g sample rises by 44.4°C when it absorbs 1 kJ of heat energy.

Determine the specific heat capacity of iron, in J g⁻¹K⁻¹. Use section 1 of the data booklet.

[1]

Markscheme

specific heat capacity « = $\frac{q}{m \times ∆ T} / \frac{1000 J}{50 g \times 44 K}$ » = 0.45 «J g⁻¹K⁻¹» ✔

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.

Tools » Tool 1: Experimental techniques