Grade 9 Chemistry Quiz

What is the change of physical state from solid to liquid called?

• melting

• freezing

• condensation

• sublimation

Choose the element from the list below.

• Water

• CO2

• Magnesium

• Salt

How can we separate sand from a sand-water mixture?

• Crystallisation

• Filtration

• Chromatography

An atom has 4 protons and 5 neutrons. What is the atomic number?

• 4

• 5

• 9

How many electrons can the first shell hold?

• 2

• 8

• 18

All the elements in the same group have ...

• The same number of protons.

• The same number of valence electrons.

As we move down group 1, the alkali metals ... in reactivity.

• increase

• decrease

As we move down group 7, the halogens ... in reactivity.

• increase

• decrease

We use dot and cross diagrams to draw ...

• Simple molecules

• Giant structures

The most abundant gas in the atmosphere.

• N2

• O2

• CO2

• Argon