DP Chemistry (first assessment 2025)

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Question 22M.1A.SL.TZ1.10

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.1A.SL.TZ1.10
Level	SL	Paper	1A	Time zone	TZ1
Command term	State	Question number	10	Adapted from	N/A

10.

[Maximum mark: 1]

22M.1A.SL.TZ1.10

What is the explanation for the high melting point of sodium chloride?

A. The covalent bond between sodium and chlorine atoms is strong.

B. Electrostatic attraction between sodium and chloride ions is strong.

C. Intermolecular forces in sodium chloride are strong.

D. Delocalized electrons cause strong bonding in sodium chloride.

[1]

Markscheme

B

Syllabus sections

Structure 2. Models of bonding and structure » Structure 2.3—The metallic model » Structure 2.3.1—A metallic bond is the electrostatic attraction between a lattice of cations and delocalized electrons. Explain the electrical conductivity, thermal conductivity and malleability of metals.

Structure 2. Models of bonding and structure » Structure 2.2—The covalent model » Structure 2.2.1—A covalent bond is formed by the electrostatic attraction between a shared pair of electrons and the positively charged nuclei. The octet rule refers to the tendency of atoms to gain a valence shell with a total of 8 electrons. Deduce the Lewis formula of molecules and ions for up to four electron pairs on each atom.

Structure 2. Models of bonding and structure » Structure 2.1—The ionic model » Structure 2.1.3—Ionic compounds exist as three-dimensional lattice structures, represented by empirical formulas. Explain the physical properties of ionic compounds to include volatility, electrical conductivity and solubility.