S1 Christmas Test Questions (Practice)

Question 1

State the size of a nanoparticles?

Answer 1

1-100nm

Question 2

Describe in detail the structure and bonding of graphite.

Answer 2

Graphite is a giant covalent structure which is made up of multiple layers of carbon held together by weak Van der Waal’s forces. The carbon atoms are held together by strong covalent bonds which allows for high melting and boiling point, 4 carbon atoms are covalently bonded together while the fifth is delocalised allowing it to carry charge.

Question 3

State one physical property of graphite.

Answer 3

It can conduct electricity.

Question 4

How many protons, electrons and neutrons are in silver?

Answer 4

Proton- 47
Electron- 47
Neutron- 61

Question 5

Explain why silver has a high melting point.

Answer 5

Silver has a high melting point due to the strong metallic bonds holding the structure together requiring more energy to break the bonds of silver giving it a high melting point.

Question 6

State the type of structure present in silver chloride.

Answer 6

Ionic lattice

Question 7

Explain why silver chloride conducts electricity when molten.

Answer 7

This is because the charged particles can move freely and carry charge to the positive and negative terminal.

Question 8

What is this: CH4

Answer 8

Methane

Question 9

What is NH3

Answer 9

Ammonia

Question 10

What is N

Answer 10

Nitrogen

Question 11

Explain why Nitrogen has a low boiling point.

Answer 11

Nitrogen has a low boiling point due to the weak Van der Waals forces between molecules. Forces require little (heat) energy to break.

Question 12

What is a covalent bond?

Answer 12

Shared electrons

Pair of electrons

Question 13

Explain why this compound has a high melting point and conducts electricity when molten.

Answer 13

This ionic compound has a high melting point and conducts electricity when molten because of the strong ionic bonds requiring substantial energy to break which explains the high melting point. The reason it only conducts electricity when molten is because when held together by the strong ionic bonds the charged particles cannot move but when molten they can move freely and carry charge to their positive and negative terminals.

Question 14

What is meant by the term alloy?

Answer 14

Alloy is a mixture of two or substances to gain a desirable property.

Question 15

What type of bonding and structure is in graphite?

Answer 15

Bonding: covalent
Structure: giant covalent lattice

Question 16

What type of bonding and structure is in iron?

Answer 16

Bonding: metallic
Structure: giant metallic lattice

Question 17

What type of bonding is found in silicon dioxide?

Answer 17

Covalent bonding

Question 18

What type of bonding is found in calcium oxide?

Answer 18

Ionic bonding

Question 19

What is meant by the term ion?

Answer 19

Ion means an atom that has gained or lost an electron to become a charged particle.