Preview ease 2

what is an acid?

• A pH lower then 7

• A pH higher then 7

• A pH of 7 (neutral)

What is an alkali?

• A pH lower then 7

• A pH higher then 7

• A pH of 7 (neutral)

What happens when an alkali and acid is mixed together?

• They become neutral if an acid and alkali is added equally

• They explode as soon as they've touch each other

• They have shown no reaction

• The color changes to blue when mixed for a short time

Lemons are sour because it has...

• Citric acid

• Malic acid

• Fumaric acid

• Tartaric acid

When an alkali or acid is spilled, you should...

• Wipe the area with cloth quickly

• Ignore it

• Cover the area with an item

• Quickly wash the area with lots of water

What colour is universal indicator in a strong alkali?

• Green
• Orange
• Purple
• Red

What colour is universal indicator in strong acid?

• Green
• Orange
• Purple
• Red

Reaction between acid and alkali producing salt and water:

• Combustion

• Neutralization

• Precipitation

• Decomposition

A substance that changes colour when mixed with an acid or base is a(n) ___.

• indicator

• neutraliser

• corrosive

• electricity

What color does litmus paper turn in the presence of an acid?

• blue
• black
• green
• red