Q32 of 9701_w14_qp_11

Question 32

Question 32 of 40

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Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.

A 1, 2 and 3 are correct

B 1 and 2 only are correct

C 2 and 3 only are correct

D 1 only is correct

Topics Tested

5. Chemical energetics

5.1. Enthalpy change, \(\Delta H\)

use bond energies (\(\Delta H\) positive, i.e. bond breaking) to calculate enthalpy change of reaction, \(\Delta H_r\)

11. Group 17

11.2. The chemical properties of th...

describe the relative thermal stabilities of the hydrogen halides and explain these in terms of bond strengths

3. Chemical bonding

3.4. Covalent bonding and coordinat...

(a) define the terms: - bond energy as the energy required to break one mole of a particular covalent bond in the gaseous state - bond length as the internuclear distance of two covalently bonded atoms (b) use bond energy values and the concept of bond length to compare the reactivity of covalent molecules