Elements/ Compounds Etc

Question 1

State 2 sources of methane

Answer 1

• hydrocarbons
• animal waste
• decaying organic matter
• natural gas/ coal/ crude oil/ petroleum
• anaerobic digestion

Question 2

Describe the volume and shape of liquids

Answer 2

Liquids have a fixed volume and take the shape of the container

Question 3

State one medical use of radioactive isotopes

Answer 3

Radiotherapy/ treating cancer

Question 4

What is meant by the term relative atomic mass?

Answer 4

The average mass of a naturally occurring atom compared to an atom of 12C

Question 5

Suggest why the relative atomic mass of chlorine is not a whole number

Answer 5

• chlorine has more than one isotope

- the masses of these isotopes are averaged

Question 6

How is an Rf value calculated? (Formula)

Answer 6

Rf= distance moved by substance / distance moved by solvent

Question 7

Explain what is meant by the term base

Answer 7

A substance which is a proton / hydrogen ion ACCEPTOR

Question 8

Give 2 physical properties of silicon (IV) oxide

Answer 8

• poor conductor of electricity
• high melting/ boiling point
• hard
• insoluble

Question 9

What is ionic bonding?

Answer 9

electrostatic attraction between oppositely charged ions

Question 10

Name a source of sulfur

Answer 10

Fossil fuels

Question 11

Concentrated sulfuric acid is added to glucose. Steam is given off and a black solid (carbon) is formed. What type of reaction has occurred?

Answer 11

Dehydration

Question 12

The oxide that does not react with acid or alkali

Answer 12

Carbon monoxide

Question 13

Give 1 use of ammonia

Answer 13

Making fertilisers

Nitric acid

Nylon

Explosives

Urea