foods and fuels

Question 1

Define energy store

Answer 1

Something such as a food or hot object that enables you to account for the energy at the start and end of a transfer.

Question 2

Define joules

Answer 2

Unit of measuring energy (J)

Question 3

Define calories

Answer 3

Units of measuring energy ( foods ) (cal)

Question 4

How many calories in one kilocalorie

Answer 4

1000 calories

Question 5

How many calories in one kilojoule

Answer 5

1000 joules

Question 6

How many joules in one calories

Answer 6

1 calorie = 4.184 joules

Question 7

What does our body use the energy from food for?

Answer 7

1- Movement
2- Growth
3- Repair
4- Insulation

Question 8

How can we find out how much energy is in different foods

Answer 8

Nutritional food labels

Question 9

Some examples of foods and the energy they contain ( KJ per 100g)

Answer 9

Apples: 240
Bananas: 340
Peas:250
Chips: 1000
Steak : 1000
Chocolate: 1500

Question 10

How could you experimentally determine how much energy is in cereal?

Answer 10

Burn the food and record the temperature change of water.

Question 11

Independent variable:

Answer 11

Different types of food

Question 12

Dependent variable:

Answer 12

Temperature change of water

Question 13

2 Control variables:

Answer 13

1- Same amount of water used in each type of food

2- Same mass of food sample .

Question 14

How much energy do we use up while sleeping and why

Answer 14

We use 70 kcal per hour while sleeping which is used to heep the heart beating and insulate the body ( keep it at a safe temperature)

Question 15

True or false:

We don’t use energy when we are doing nothing

Answer 15

False