Simple molecules and covalent bonds — Paper 2 · IGCSE Chemistry (9-1) 0971

5 How many electrons are used to form covalent bonds in a molecule of methanol, CH3OH? A 5 B 6 C 8 D 10

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2018

6 Potassium bromide and methanol are both compounds. Their melting points are different. Which row is correct? substance with the reason why the melting points are different higher melting point A methanol the attractive forces between oppositely charged ions is greater than the attractive forces between molecules B methanol the attractive forces between molecules is greater than the attractive forces between oppositely charged ions C potassium bromide the attractive forces between oppositely charged ions is greater than the attractive forces between molecules D potassium bromide the attractive forces between molecules is greater than the attractive forces between oppositely charged ions

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2018

5 Which row describes the formation of single covalent bonds in methane? A atoms share a pair of electrons both atoms gain a noble gas electronic structure B atoms share a pair of electrons both atoms have the same number of electrons in their outer shell C electrons are transferred from one both atoms gain a atom to another noble gas electronic structure D electrons are transferred from one both atoms have the same number atom to another of electrons in their outer shell

1 marks

Answer: A

This question in 0971/21 May/June 2019

5 What is the total number of electrons in one molecule of ammonia, NH3? A 6 B 8 C 10 D 11

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2019

5 The electronic structures of two atoms, P and Q, are shown. P Q P and Q combine together to form a compound. What is the type of bonding in the compound and what is the formula of the compound? type of bonding formula A ionic PQ B ionic PQ2 C covalent PQ2 D covalent PQ

1 marks

Answer: A

This question in 0971/21 May/June 2020

7 Which statement explains why methane has a lower boiling point than water? A Methane has weaker covalent bonds than water. B Methane has weaker attractive forces than water. C Methane molecules are heavier than water molecules. D Methane molecules have more bonds than water molecules.

1 marks

Answer: B

This question in 0971/21 May/June 2020

5 The electronic structures of two atoms, P and Q, are shown. P Q P and Q combine together to form a compound. What is the type of bonding in the compound and what is the formula of the compound? type of bonding formula A ionic PQ B ionic PQ2 C covalent PQ2 D covalent PQ

1 marks

Answer: A

This question in 0971/22 May/June 2020

7 The bonding, structure and melting point of sodium chloride and sulfur dichloride are shown. compound bonding structure melting point / °C sodium chloride ionic giant lattice 801 sulfur dichloride covalent simple molecular –121 Why does sulfur dichloride have a lower melting point than sodium chloride? A The covalent bonds in sulfur dichloride are weaker than the attractive forces between molecules in sodium chloride. B The covalent bonds in sulfur dichloride are weaker than the ionic bonds in sodium chloride. C The attractive forces between molecules in sulfur dichloride are weaker than the attractive forces between molecules in sodium chloride. D The attractive forces between molecules in sulfur dichloride are weaker than the ionic bonds in sodium chloride.

1 marks

Answer: D

This question in 0971/22 May/June 2020

7 Which row identifies compounds that contain single covalent bonds only, double covalent bonds only or both single and double covalent bonds? single covalent bonds double covalent bonds both single and only only double covalent bonds A C2H4 CH3OH CO2 B CH3OH C2H4 CO2 C CH3OH CO2 C2H4 D CO2 C2H4 CH3OH

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2020

5 A covalent molecule Q contains only six shared electrons. What is Q? A ammonia, NH3 B chlorine, Cl 2 C methane, CH4 D water, H2O

1 marks

Answer: A

This question in 0971/21 May/June 2021

24 Element R forms a covalent compound R2Si with silicon. Which row describes R? metallic or group number in non-metallic character the Periodic Table A metallic II B metallic VI C non-metallic II D non-metallic VI

1 marks

Answer: D

This question in 0971/21 May/June 2021

5 A covalent molecule Q contains only six shared electrons. What is Q? A ammonia, NH3 B chlorine, Cl 2 C methane, CH4 D water, H2O

1 marks

Answer: A

This question in 0971/22 May/June 2021

7 Which statement describes the attractive forces between molecules? A They are strong covalent bonds which hold molecules together. B They are strong ionic bonds which hold molecules together. C They are weak forces formed between covalently-bonded molecules. D They are weak forces which hold ions together in a lattice.

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2021

6 Which diagram represents the outer-shell electron arrangement in a nitrogen molecule? A B C D N N N N N N N N

1 marks

Answer: D

This question in 0971/21 May/June 2022

6 Which dot-and-cross diagram shows the arrangement of outer shell electrons in a molecule of hydrogen chloride? A B C D H Cl H Cl H Cl H Cl

1 marks

Answer: A

This question in 0971/22 May/June 2022

6 Which molecule contains only three shared pairs of electrons? A CH3OH B Cl 2 C H2O D N2

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2022

6 Which row describes the formation of single covalent bonds in methane? A atoms share a pair of electrons both atoms gain a noble gas electronic structure B atoms share a pair of electrons both atoms have the same number of electrons in their outer shell C electrons are transferred from one both atoms gain a atom to another noble gas electronic structure D electrons are transferred from one both atoms have the same number atom to another of electrons in their outer shell

1 marks

Answer: A

This question in 0971/21 May/June 2023

3 Ammonia, NH3, is a covalent molecule. Which diagram shows the outer-shell electron arrangement in a molecule of ammonia? A B H N H H N H H H C D H N H H N H H H

1 marks

Answer: C

This question in 0971/22 May/June 2023

6 Which substance has the lowest melting point? A graphite B methanol C silicon(IV) oxide D sodium chloride

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2023

8 How many electrons are shared in one molecule of nitrogen and in one molecule of ethene? nitrogen ethene A 2 12 B 2 8 C 6 12 D 6 8

1 marks

Answer: C

This question in 0971/21 May/June 2024

9 What is the total number of electrons in one molecule of ammonia, NH3? A 6 B 8 C 10 D 11

1 marks

Answer: C

This question in 0971/21 May/June 2024

4 Which diagram shows the arrangement of the outer shell electrons in a molecule of water? A B H H H H O O C D H H H H O O

1 marks

Answer: C

This question in 0971/22 May/June 2024

6 Which diagram shows the covalent bonding in a molecule of carbon dioxide? A O–C–O B O=C–O C O=C=O D O≡C≡O

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2024

7 The bonding, structure and melting point of sodium chloride and sulfur dichloride are shown. compound bonding structure melting point / C sodium chloride ionic giant lattice 801 sulfur dichloride covalent simple molecular –121 Why does sulfur dichloride have a lower melting point than sodium chloride? A The covalent bonds in sulfur dichloride are weaker than the attractive forces between molecules in sodium chloride. B The covalent bonds in sulfur dichloride are weaker than the ionic bonds in sodium chloride. C The attractive forces between molecules in sulfur dichloride are weaker than the attractive forces between molecules in sodium chloride. D The attractive forces between molecules in sulfur dichloride are weaker than the ionic bonds in sodium chloride.

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2024