Acids, alkalis and electricity

The chemicals created after a chemical reaction is called _________.

• reactant

• product

• reactor

• prodant

When carbon-based fuel is burned completely, what is produced?

• carbon

• carbon monoxide

• carbon dioxide

• carbon trioxide

When a metal reacts with an acid, __________ and __________ are produced.

• alkali

• salt

• oxygen gas

• hydrogen gas

How does toothpaste function?

• It neutralises the acid produced by bacteria.

• It neutralises the alkali produced by bacteria.

• It poisons the bacteria in our mouths.

• It reacts with the bacteria to create sugar.

What do farmers use to neutralise the acid in the soil?

• coal

• lemon

• lime (the fruit)

• lime (not the fruit)

Which of the following are clues that a reaction has occured? Choose two.

• There is a colour change

• The volume of a reactant increases

• Gas turns into a liquid

• A precipitate is formed

Which of the following is a way to test the presence of hydrogen gas?

• using a glowing splinter

• using a universal indicator

• using a burning splinter

• using a litmus paper

Which of the following is a way to test the presence of oxygen gas?

• using a glowing splinter

• using a universal indicator

• using a burning splinter

• using a litmus paper

When carbon dioxide is tested with a burning splinter, the fire _______________.

• gets bigger

• gets smaller

• doesn't change

• is extinguished

When carbon dioxide is added to limewater, it

• explodes

• turns cloudy

• releases oxygen

• creates lime (not the fruit)