KS3 Chemical reactions

True or false? Chemical reactions are easily reversible

• True

• False

Tags

NGSS.HS-PS1-6

True or false: A change in state is a chemical reaction

• True - something melting would be an example of a chemical reaction

• False - a change in state is a physical change

Tags

NGSS.MS-PS1-2

In a word equation, the starting chemicals are called...

• reactants

• products

• ingredients

Tags

NGSS.MS-PS1-5

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

Magnesium + Oxygen --> Magnesium oxide

• magnesium

• magnesium and oxygen

• magnesium oxide

• oxygen

Tags

NGSS.HS-PS1-2

A material that burns to transfer energy is called a...

• compound

• wood

• fuel

• petrol

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

What is the scientific term given when something burns?

• a fuel

• flammable

• combustion

• heating

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What does a fuel need in order to burn?

• fuel

• electricity

• oxygen

• hydrogen

In the thermal decomposition of calcium carbonate:

Calcium carbonate --> Calcium oxide + ?

HINT: gas

• oxygen

• calcium

• carbon monoxide

• carbon dioxide

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

What is the conservation of mass?

• mass of reactants > mass of products

• mass of reactants < mass of products

• mass of reactants = mass of products

Tags

NGSS.MS-PS1-5

magnesium + oxygen --> magnesium oxide

If you started with 5g of magnesium and 2.5g of oxygen, what mass of magnesium oxide would be produced?

• 5g

• 2.5g

• 7.5g

• 10g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5