Y8 Reactions 2 revision

What name do we use for the chemicals which are present at the start of a reaction?

• Reactions

• Reactants

• Products

• Producers

What name do we use for the chemicals which are present after a reaction?

• Reactions

• Reactants

• Products

• Producers

Which of the following statements is true?

• There are more atoms after a reaction than before

• There are more atoms before a reaction than after

• There is the same number of atoms before and after a reaction

Complete the statement:

In a chemical reaction the atoms...

• Disappear

• Burn away

• Rearrange to form new compounds

• Rearrange into a different state

Hydrogen + Oxygen --> ________

• Hydroelectric

• Hydrogen carbonate

• Water

• Oxide

How many different types of atom are in Nitrogen dioxide

• 1

• 2

• 3

• 4

How many oxygen atom are in Nitrogen dioxide

• 1

• 2

• 3

• 4

Which of these is a sign of a chemical reaction taking place?

• Bad smell

• Fizzing / bubbles

• Change of state

• Nothing happens

Which of these is a sign of a chemical reaction taking place?

• Colour change

• Melting

• Change of state

Lithium + Oxygen --> _________

• Lithium oxide

• Lithium nitrate

• Lithium Hydroxide

• Lithium carbonate