S1 Food Science TEST

Breaks down QUICKLY into the GLUCOSE needed for respiration.

Breaks down SLOWLY into the GLUCOSE needed for respiration.

Breaks down into AMINO ACIDS which form new proteins used in many life processes. Eg. Meat

Needed in very small amounts to keep you healthy.

Used to make bodily fluids, allows chemicals to react in cells, and gives them shape. Eg. Drinks

A balanced diet means eating a good range of the different nutrients/ food groups.

Stored in fat cells. If there is no CARBOHYDRATE, fat breaks down into the GLUCOSE needed for respiration.

NOT digested, but keeps food moving. Gut bacteria feed off it. Eg. Anything plant-based

Food is a chemical store. Organisms need energy to reproduce, grow and move.

Kilojoules (kJ) and Kilocalories (kcal)

Kilocalories is often just called calories in everyday life.

4.2 kJ = 1 kcal

k is the abbreviation for kilo which means a thousand.

1 kJ = 1000 J

The amount of thermal energy released from combusting (burning) food can be used to measure the amount of energy in its chemical store.

We can do this by heating water in a boiling tube using burning food and then measuring the increase in temperature of the water.

The variable you decide to change.

The variable that changes because you changed the independent variable.

A variable that needs to be kept the same. Changing it will affect the results.

Type of crisp.

Temperature change of the water.

Mass of crisp.

Complete combustion of crisp