Atoms

Question 1

Describe why these gases diffuse [1]

Answer 1

random motion of molecules

Question 2

Describe nucleon number [2]

Answer 2

total number of protons and neutrons
in the nucleus of an atom

Question 3

Identify the particles in the air which cause the random movement of dust particles [2]

Answer 3

nitrogen/oxygen
molecules

Question 4

Suggest the identity of a covalent compund with a higher mp than LiCL [1]

Answer 4

silicon (IV) oxide

Question 5

Describe the bonding in iron [3]

Answer 5

positive ions
sea of electrons
electrostatic forces of attraction

Question 6

Steel has small amount of carbon in iron. Explain why steel is less malleable than iron [2]

Answer 6

particles different sizes
layers cannot slide

Question 7

What is a covalent bond? [2]

Answer 7

a shared
pair of electrons

Question 8

Explain why chlorine does not react with aqueous sodium fluoride [1]

Answer 8

chlorine less reactive than fluorine

Question 9

what type of structure does sodium chloride have? [1]

Answer 9

giant ionic lattice

Question 10

Why do sodium ions have charge of +1? [1]

Answer 10

1 more proton than electrons

Question 11

Phosphorus, P4, reacts with air to produce phosphorus (V) oxide, P4O10. What type of chemical reaction is this? [1]

Answer 11

redox/combustion