Chemistry Paper 1

Question 1

Independent variable

Answer 1

variable that you change

Question 2

Control variable

Answer 2

variable you keep the same

Question 3

Dependant variable

Answer 3

variable being tested or measured

Question 4

Metal oxide / hydroxide + acid

Answer 4

salt + water

Question 5

Metal carbonate + acid

Answer 5

salt + water + carbon dioxide

Question 6

Formula for limewater

Answer 6

calcium hydroxide Ca(OH)2

Question 7

Why is chlorine as gas at room temp

Answer 7

• Hydrogen chloride is made up of small molecules
• So it has weak intermolecular forces
• Which require little energy to break

Question 8

Pipette vs Burette

Answer 8

Pipette measures a fixed volume
Burette measures a variable volume

Question 9

What is a covalent bond

Answer 9

Nuclei attrracted to shared pair of electrons by electrostatic forces

Question 10

Simple molecular substances

Answer 10

• covalent
• atoms within molecules held togehter by very strong covalent bonds
• forces between molecules are very weak
• gas or liquid at room temp

Question 11

Intermolecular forces

Answer 11

very weak and require little energy to break
larger when in a polymer so require more enrgy to break so polymers are solid at room temp

Question 12

giant ionic latice structure

Answer 12

strong electrostatic forces of attraction between oppositely charged ions
ionic bonding