Year 7B Science Unit 8 Revision

What is on the left hand side of a chemical reaction?

e.g. magnesium + hydrochloric acid -> magnesium chloride + hydrogen

• reactants

• products

• metals

• gases

What is on the right hand side of a chemical reaction?

e.g. magnesium + hydrochloric acid -> magnesium chloride + hydrogen

• reactants

• products

• metals

• gases

Melting is a physical change because...

• something new is made

• no new products are made, it is just a change of state

• new water is produced

• new products are made

The scientific name for burning is...

• combustion

• composition

• decomposition

• combobulation

What is the process called when a solid turns into a liquid?

• Sublimation

• Evaporation

• Condensation

• Melting

What gas is produced when a metal reacts with an acid

• hydrogen

• hydrogen oxide

• oxygen

• carbon dioxide

• squeaky pop

How can you test to show that when a metal reacts with water, hydrogen gas is produced?

• Relights a glowing splint
• A lit splint produces a squeaky pop
• Puts out a burning splint
• Is cold to the touch

Which gas is required for something to burn?

• Carbon dioxide 
• Hydrogen 
• Oxygen 
• Water 

Which one is an example of a physical change?

• Burning paper

• Rusting of iron

• Boiling water

• Cooking an egg

In this chemical reaction, which is the product/s?

Magnesium + Oxygen --> Magnesium oxide

• magnesium

• magnesium and oxygen

• magnesium oxide

• oxygen