What a fizzer

Question 1

What are the three particle models?

Answer 1

Solid, liquid and gas.

Question 2

What are the features of a chemical and physical change?

Answer 2

Chemical: Not easily reversed, change in colour, substance and temperature.
Physical: Change in colour, shape and state, easily reversed.

Question 3

What is a pure substance?

Answer 3

Pure substances are made up of the same element and are not chemically combined.

Question 4

What is a mixture?

Answer 4

Mixtures are made up of more than one thing and are not chemically combined.

Question 5

What are elements?

Answer 5

Substances which are made up of ONE type of atom.

Question 6

What are compounds?

Answer 6

Substances which are made up of at least two different types of atoms and are chemically combined.

Question 7

List the outcomes of Neutralisation equations.

Answer 7

Acid + Base –> salt + water
Acid + Metal –> salt + hydrogen
Acid + Carbonate –> salt + carbon dioxide + water

Question 8

What is an endothermic reaction?

Answer 8

Energy which is absorbed by an object. Decrease in surrounding temperature. New bonds are formed.

Question 9

What is an exothermic reaction?

Answer 9

Energy is released from an object. Increase in surrounding temperature as they gain kinetic energy.

Question 10

What is the chemical formula for photosynthesis?

Answer 10

Carbon Dioxide + water ——> glucose + oxygen
sunlight
- endothermic

Question 11

What is the chemical formula for respiration?

Answer 11

Glucose + oxygen –> carbon dioxide + water + energy
- exothermic