In this question Q is used to represent a halogen atom. Magnesium and calcium each form a compound with chlorine and a compound with bromine. One of these compounds contains: - the element in Group 2 with the higher first ionisation energy and - the element in Group 17 with the higher $$$\mathrm{Q}-\mathrm{Q}$$$ bond energy. What is the formula of this compound?

$\mathrm{MgCl}_{2}$

$\mathrm{MgBr}_{2}$

$\mathrm{CaCl}_{2}$

$\mathrm{CaBr}_{2}$

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_w24_qp_11 Year：2024 Question No：1

Answer:

Knowledge points:

1.4.1 define and use the term first ionisation energy, IE

1.4.2 construct equations to represent first, second and subsequent ionisation energies

1.4.3 identify and explain the trends in ionisation energies across a period and down a group of the Periodic Table

1.4.4 identify and explain the variation in successive ionisation energies of an element

1.4.5 understand that ionisation energies are due to the attraction between the nucleus and the outer electron

1.4.6 explain the factors influencing the ionisation energies of elements in terms of nuclear charge, atomic/ionic radius, shielding by inner shells and sub-shells and spin-pair repulsion

1.4.7 deduce the electronic configurations of elements using successive ionisation energy data deduce the position of an element in the Periodic Table using successive ionisation energy data

11.2.1 describe the relative reactivity of the elements as oxidising agents

11.2.2 describe the reactions of the elements with hydrogen and explain their relative reactivity in these reactions

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

Answer:

Knowledge points:

Solution:

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