C1.2.2 - Atoms, mixtures and compounds

Question 1

Which images contain molecules?

Answer 1

A, B, C and D

Question 2

What is a compound?

Answer 2

A substance made up of atoms of 2 or more elements.

Question 3

What is a mixture?

Answer 3

A group of substances that are not chemically bonded together.

Question 4

In which state are the substances shown in the diagrams?

Answer 4

Gas

Question 5

Which images contain 1 type of molecule only and nothing else?

Answer 5

A, C and D

Question 6

How are properties of the compound H₂O (water) different to the properties of its elements?

Answer 6

H₂ - hydrogen is a gas

O - oxygen is a gas

H₂O - water is a liquid

Question 7

Are the properties of a compound the same as the properties of the elements that make the compound?

Answer 7

No compounds have different properties compared to their elements.

Question 8

Salt is a common compound. What is the chemical name for salt?

Answer 8

Sodium Chloride

(NaCl)

Question 9

Which image shows a compound made from 3 different types of element?

Answer 9

C

Question 10

Which image shows a mixture?

Answer 10

B

Question 11

Which images show compounds?

Answer 11

A and C

Question 12

Compounds containing 2 elements always end in which suffix?

Answer 12

“ide”

e.g. sodium + chlorine –> sodium chloride

Question 13

What is a molecule?

Answer 13

When more than one atom is bonded together.

Question 14

The diagram below shows some particles of a substance at room temperature.

Explain what the diagram tells you about the substance.

Answer 14

• The substance is made up of molecules.
• The substance is in the gas state at room temperature…
• …since its molecules are separate from each other and randomly arranged.
• The substance is a compound…
• …since it is made up of atoms of more than one element.
• One molecule of the substance is made up of one atom of one element and two atoms of another element.