CAIE IGCSE Chemistry 5.1.5 Activation Energy Ea As the Minimum Questions

Define activation energy and identify the minimum energy required for reacting particle collisions.

Exam points

define activation energy as the minimum energy for reaction
identify activation energy on an energy profile
relate activation energy to successful particle collisions
compare activation-energy barriers in reaction pathways
interpret activation-energy labels in combustion diagrams

[Maximum number: 1]

Three statements about activation energy, $E_{a}$ , are listed.

1 Colliding particles must have at least $E_{\mathrm{a}}$ before they can react.
$2 E_{\mathrm{a}}$ for exothermic reactions is always greater than for endothermic reactions.
$3 E_{a}$ is always endothermic.

Which statements are correct?

1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

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CAIE IGCSE Chemistry 5.1.5 Activation Energy Ea As the Minimum Questions question 1