DP Chemistry (first assessment 2025)

Question 20N.1A.SL.TZ0.15

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.SL.TZ0.15
Level	SL	Paper	1A	Time zone	TZ0
Command term	Determine	Question number	15	Adapted from	N/A

15.

[Maximum mark: 1]

20N.1A.SL.TZ0.15

Which statements about bond strength and activation energy are correct for this reaction?

${CH}_{4} (g) + 2 O_{2} (g) \to {CO}_{2} (g) + 2 H_{2} O (l)$ $∆ H^{⦵} = - 891 kJ$

[1]

Markscheme

Examiners report

More than 60% could select relative bond strength of products and reactants in an exothermic reaction, and correctly apply the magnitude of activation energy between forward and reverse reactions for this.

Syllabus sections

Reactivity 2. How much, how fast and how far? » Reactivity 2.2—How fast? The rate of chemical change » Reactivity 2.2.4—Activation energy, Ea, is the minimum energy that colliding particles need for a successful collision leading to a reaction. Construct Maxwell–Boltzmann energy distribution curves to explain the effect of temperature on the probability of successful collisions.

Question 20N.1A.SL.TZ0.15

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