Acids and Alkali Quiz

A chemical reaction is a change in which atoms are rearranged to make new substances.

• True

• False

How do you know if a chemical reaction has taken place?

• see huge flames or tiny sparks

• notice a sweet smell or a foul stink

• feel the substances getting hotter or colder

• hear a loud bang or a gentle fizzing

Chemical reactions are useful to make many useful substances like:

• All of these answers

• Medicines, such as paracetamol

• Fabrics, such as polyester

• building materials, such as cement

A change that is reversible, in which new substances are not made.

• Physical change

• Chemical change

All changes are chemical reactions.

• False

• True

Example of a physical change

• Change of state

• Cooking an egg.

• Mixing an acid with a base

Vomit, vinegar and lemon juice are all examples of...

• Acids

• Alkalis

• Neutral solutions

Baking soda, Cleaning products, Soap, Toothpaste, Indigestion tablets are all examples of ...

• Alkalis

• Acids

• Neutral solutions

What does this hazard symbol mean?

• corrosive

• flammable

• toxic

• irritant

What does this hazard symbol mean?

• toxic

• corrosive

• flammable

• irritant