Bonding and properties of materials test questions

1

Which of the following pairs are both diatomic elements?

Hydrogen and helium

Iodine and nitrogen

Boron and fluorine

2

How can the bonding in silicon dioxide (SiO₂) be described?

Silicon and oxygen atoms bonded together in a large, regular, repeating structure.

Ionic

Discrete covalent molecular

Covalent network

3

Why do ionic compounds not conduct when they are solid?

Their atoms are not free to move

Their electrons are not free to move

Their ions are not free to move

4

Substance	Melting Point (°C)	Boiling Point (°C)	Electrical conductivity as a solid	Electrical conductivity as a liquid	Electrical conductivity in aqueous solution
A	1538	2862	Good	Good	Insoluble
B	1414	3625	Poor	Poor	Poor
C	650	1091	Good	Good	Insoluble
D	801	1413	Poor	Good	Good
E	-182	-162	Poor	Poor	Poor
F	851	1633	Poor	Good	Good

The table shows the properties of some different substances. Which substances are covalent?

B + E

A + C

C + E

5

Substance	Melting Point (°C)	Boiling Point (°C)	Electrical conductivity as a solid	Electrical conductivity as a liquid	Electrical conductivity in aqueous solution
A	1538	2862	Good	Good	Insoluble
B	1414	3625	Poor	Poor	Poor
C	650	1091	Good	Good	Insoluble
D	801	1413	Poor	Good	Good
E	-182	-162	Poor	Poor	Poor
F	851	1633	Poor	Good	Good

The table above shows the properties of some different substances. Which substances are ionic?

A + C

B + E

D + F

6

In the compound tin(IV) chloride, a small group of atoms are held together by shared pairs of electrons. What type of bonding is present in tin (IV) chloride?

Ionic

Discrete covalent molecular

Covalent network

7

Which of these compounds are made up of diatomic molecules?

Nitrogen monoxide (NO)

Magnesium oxide (MgO)

Carbon dioxide (CO₂)

8

Which of these does not have a covalent network structure?

Chlorine

Diamond

Graphite

9

Which of these diagrams best represents the attractions that form the covalent bond holding the atoms together in the molecule?

Atom one nucleus at 6 o'clock. Electron sits at 1 o'clock. Atom two nucleus at 10 o'clock and electron at 4 o'clock. Nucleus one exerts a pull on electron two, but not on electron one.

Atoms overlapping outer shells. Nucleus centre of both atoms. Two electrons in overlap of energy shells. Nucleus one pulls on electron two, not one. Nucleus two pulls on electron one, not two.

Two atoms overlapping energy shells. Nucleus sits centre atoms one and two. Two electrons sit in overlap Nucleus one equal pull on electrons one and two Nucleus two equal pull on electrons one and two

10

How can the shape of methane (CH₄) molecules be described?

Bent

Tetrahedral

Pyramidal