L2-3 - Respiration Experiments

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objectives

Outline the role of respiration in providing energy for the activities of cells
State the equation for aerobic respiration using symbols: C₆H₁₂O₆ + 6O₂ → 6CO₂+ 6H₂O

Aerobic Respiration - A recap

The products of aerobic respiration are carbon dioxide, water and energy.

Energy is released as chemical energy (ATP) and heat. ATP is used for various things, such as muscle contraction. The heat energy helps to maintain a steady body temperature.

Class Practical

Lime water turns milky/cloudy when you pass carbon dioxide through it because a reaction takes place that produces a white precipitate.

This can be used as evidence that carbon dioxide is excreted by the lungs.

Class Practical 2 - Germinating Seeds

Complete the class practical using Germinating seeds - you may need to leave this for 24 hours!

CO2-production-prac.pdf

alternative to class practicals - gizmo activity

Due to the coronavirus epidemic it may not be possible to perform the practical experiments in the laboratory. In this case please complete the gizmo titled 'Cell Energy Cycle' - the worksheet can be found below:

CellEnergySE.pdf

Aerobic respiration produces CO₂

Carbon dioxide production can also be detected using an indicator called hydrogen carbonate indicator. Hydrogen carbonate indicator changes colour to show the level of carbon dioxide in the surrounding air.

Predicting respiration activity

Task: What colour will each go? Explain your answer

Respiration and Heat practical

Complete the practical worksheet below:

Heat-production-prac.pdf

Predicting Temperature change in our practical activity

Answer the Questions below:

What would you expect to happen to the temperature in the bell jar containing the germinating seeds? Explain your answer.
What is the purpose of the boiled seeds?
Why were the bell jars sealed with wet cotton wool?
Why should the seeds be sterilised (surface bacteria killed) before putting them into the bell jars?

Respiration and Heat

Respiration produces Heat Energy

When we are cold we shiver as this increases respiration in our muscle cells

This produces Heat and warms us up