UNIT 5: CHEMICAL REACTIONS

What chemical reaction is shown in this picture?

• oxidation

• fermentation

• combustion

What chemical reaction is shown in the picture?

• oxidation

• fermentation

• combustion

What chemical reaction is shown in the picture?

• oxidation

• fermentation

• combustion

Click on the TRUE statements

• The original substances of a chemical reaction are called products.

• New products are always formed from a chemical reaction.

• Microorganisms, oxygen and thermal energy can cause chemical reactions to take place

• The atoms within the new products of a chemical reaction are not

  chemically linked

• We cannot use simple separation methods, like distillation, to separate

  the products of a chemical reaction

The energy change that PRODUCES energy and then, products become WARMER is called....

• exothermic reaction

• endothermic reaction

• precipitate formation

The energy change that ABSORBS energy and then, products become COLDER is called....

• Exothermic reaction

• Endothermic reaction

• Color change

When two solutions are combined and show a change in composition, it is called...

• Gas formation

• Colour change

• Precipitate formation

It can happen through bubbles or smell. It is...

• Color change

• Gas formation

• Precipitate formation

When the original reactant changes to a different color, it is called...

• Color change

• Gas formation

• Precipitate formation

COMPLETE WITH THE MISSING WORD:

During a chemical reaction, the ___________ within the substances reorganise and unite in different ways

• reactants

• lights

• atoms