Chemistry Review

What is the term for gaseous molecules that are made up of two conjoined atoms, such as H₂, O₂, and N₂?

• diatomic

• monotomic

• ionic

• compound

Ammonia gas is prepared at the front of a laboratory.

The pungent smell of ammonia spreads throughout the laboratory slowly.

Name the process that occurs when ammonia gas spreads throughout the laboratory.

A bottle of liquid perfume is left open at the front of a room.

After some time, the perfume can be smelled at the back of the room.

What two physical processes are taking place?

• evaporation

• condensation

• diffusion

• dissolution

• precipitation

The table shows some properties of the Group 0 elements helium, neon, argon and krypton.

Which element in the table has the highest melting point?

• helium

• neon

• argon

• krypton

Tags

NGSS.MS-PS1-4

Some changes of state of sodium are shown.

Give the names of the changes of state represented by R.

Tags

NGSS.MS-PS1-4

Some changes of state of sodium are shown.

Give the names of the changes of state represented by S.

Tags

NGSS.MS-PS1-4

The changes of state of water are shown.

Give the names of the changes of state represented by A.

Tags

NGSS.MS-PS1-4

The changes of state of water are shown.

Give the names of the changes of state represented by B.

Tags

NGSS.MS-PS1-4

Refinery gas is a mixture of hydrocarbons.

One refinery gas is butane, C₄H₁₀.

Suggest the name of one other refinery gases.

Petroleum is a useful natural resource.

The diagram shows how petroleum can be separated into useful substances.

What is the name of the separation process shown in the diagram?