Year 9 Chemistry Pretest

Front

Which ONE of the following is a physical change? melting ice, burning wood, rotting food, rusting iron

Back

melting ice

Front

How is chemical change different from physical change?

Back

In a chemical change a new substance is formed.

Front

Which of the following is ONE of the signs of a chemical reaction?

• gas production
• water changing to water vapour
• Ice changing to water
• butter melting

Back

gas production

Front

Iron reacts with oxygen to form iron oxide (rust). What is the correct word equation?

Back

Iron + oxygen ---------> iron oxide

Front

An atom is made up of which subatomic particles?

Back

Protons, neutrons, electrons

Front

Molecule

Back

group of atoms chemically bonded together.

Front

The picture below shows:
Options: an atom, an ion, a compound, an element

Back

an element

Front

The picture shown represents:

Back

a compound

Front

What is the maximum number of electrons found in the innermost (first) shell?

Back

2

Front

Correct Bohr diagram for Lithium (atomic number = 3). Options: A, B, C, D.

Back

B