Atoms & Molecules

Question 1

What is an atom

Answer 1

the smallest part of an element which can take part in a chemical reaction

Question 2

What elements exist as individual atoms

Answer 2

• Some elements, such as the noble gases, exist as individual atoms

Question 3

What is a molecule

Answer 3

the smallest part of a substance, either element or compound, which can exist having all the properties of the substance

Question 4

What do we call molecules

Answer 4

elements that consist of two or more atoms joined together

Question 5

What is a compound

Answer 5

if the molecules of a compound consist of two or more different kinds of atoms, the substance is a compound

Question 6

Give an example of an atom

Answer 6

Hydrogen atom - H

Question 7

Give an example of a molecule

Answer 7

Hydrogen molecule - H2

Question 8

Give an example of a compound

Answer 8

 Hydrogen-oxygen compound H2O (water)

Question 9

Name some common compounds

Answer 9

H 2 O water

NH 3 ammonia

N 2 O nitrous oxide

CO carbon monoxide

CS2 carbon disulfide

SO 3 sulfur trioxide

CCl 4 carbon tetrachloride

PCl 5 phosphorus pentachloride

SF 6 sulfur hexafluoride

Question 10

Is methane, CH4 an element or compound?

Answer 10

compound

Question 11

Is hydrogen peroxide, H2O2 an element or compound?

Answer 11

Compound

Question 12

Is oxygen (ozone), O3 an element or compound?

Answer 12

Element

Question 13

Is sulphur, S8 an element or compound?

Answer 13

Element

Question 14

Is sulphuric acid, H2SO4 an element or compound

Answer 14

Compound

Question 15

Is carbon, C60 an element or compound?

Answer 15

Element