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CAIE IGCSE Chemistry 5.1.7 Bond Breaking Is an Endothermic Questions

Explain reaction energy changes by comparing energy absorbed in bond breaking with energy released in bond making.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • relate bond breaking to energy absorption
  • relate bond making to energy release
  • explain exothermic reactions using bond-energy changes
  • explain endothermic reactions using bond-energy changes
  • identify reaction type from relative bond-breaking and bond-making energy
  • apply bond-energy reasoning to water, hydrogen, halogens and combustion

CAIE IGCSE Chemistry 5.1.7 Bond Breaking Is an Endothermic Questions question 1

[Maximum number: 1]

The equation for the reaction between gaseous hydrogen and gaseous iodine to form gaseous hydrogen iodide is shown.

H2( g)+I2( g)→2HI( g)\mathrm{H}_{2}(\mathrm{~g})+\mathrm{I}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{HI}(\mathrm{~g})

The reaction is exothermic.
Which statement explains why the reaction is exothermic?

A

Energy is released when H-H and I-I bonds are broken.

B

The bond energies of the reactants are larger than the bond energies of the products.

C

The products are at a higher energy level than the reactants.

D

More energy is released when two HI bonds are formed than is used when the H-H and I-I bonds are broken.

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