Which of the following are not a reason for a chemical change to occur ?

• Electricity

• Catalyst

• Heat

• Mixing ( close contact )

• They all are reasons why a chemical change can occur.

What are the 4 chemical changes we have studied ?

relax for this question I have given 2 mins so take your time and answer.

which definition given below define a synthesis / direct combination reaction.

• A reaction where 1 substance breaks down to form 2 substances.

• A reaction where 2 substances combine together to form a single substance

• A combination of 3 or more substances to form 2 substances.

• A banana

A compound made up of a liquid and another element is a:

• Solution

• Solute

• Solvent

• Salutation

Catalysts (BLANK) chemical reactions.

• slow down

• speed up

• stop

• reverse

A chemical reaction has two parts: the (BLANK) and the products.

• Elements

• Compounds

• Reactants

• None of these

In saltwater, the water is the:

• Solute

• Solvent

• Wet Stuff

• None of these

To start a reaction you need:

• Light

• Power

• Fire

• Activation Energy

In our body, we have these catalysts to help us digest food:

• white blood cells

• hormones

• enzymes

• none of these

Sodium (Na) and Chlorine (Cl) come together to make sodium chloride (NaCl), this is:

• salt

• powder

• gas

• sugar