Respiration

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Slide 1

Respiration

Slide 2

Custard powder experiment

Did the food contain energy?

What kind of energy did it have to start with?

What kinds of energy was this released as?

Slide 3

Slide 4

Comparing energy in carbohydrates, proteins and fats

Use different types of food to calculate which will give the most energy

Slide 5

Results

Slide 6

Calculating energy in food

A given amount of any substance always requires the same amount of energy to produce a particular increase in temperature.

1000g of water needs……………… 4.2 kJ to make its temperature rise by 1 oC

Slide 7

Calculating the energy content of foods

The formula to calculate the energy release is

4.2 x M x T

Now calculate the energy content of your foods

1000

M = mass of water (g)

T=rise in temperature ( °C)

Slide 8

Calorimeter

Slide 9

Gases and respiration

A: Living Peas B: Dead Peas

Burn a lighted splint in each gas jar.

Slide 10

Do other organisms respire?

breathing and respiration

Slide 11

1 Which type of energy does food contain?

2 What is this energy converted to by other organisms? Give at least 3 examples.

(i)

(ii)

(iii)

3 What name is given to the process by which organisms release energy?

4 What kind of energy is always released in respiration?

Slide 12

The Chemistry of Respiration

energy and mitochondria clip

Slide 13

Adenosine triphosphate

The energy released during respiration is not used directly by cells.

Instead it is used to make a molecule called ATP which stores the energy until it is needed.

ATP = Adenosine triphosphate

Slide 14

What does ATP do?