Page 16 - 新思维科学学生用书8 样章

1.2 Gas exchange

Continued

7 Continue until the limewater in one of the tubes has gone cloudy. Make a note
of which tube it is.

Questions
1 The air that you breathe out is called expired air.
In which tube did your expired air bubble through the limewater?

2 The air that you breathe in is called inspired air.
In which tube did your inspired air bubble through the limewater?
3 In which tube did the limewater go cloudy first?
4 Name the gas that makes limewater go cloudy.

5 Copy and complete these sentences. Use some of these words:
A B expired inspired less more
The limewater went cloudy first in tube ………………… .
This is the limewater that ………………… air bubbles through.

Our results show that expired air contains ………………… carbon dioxide than
inspired air.

Self-assessment
Think about how you did the experiment.
Copy each bulleted statement, and then draw a face next to each one according to
how well you think you performed.

I think I did this really well.

I did OK, but I could probably do better.

I didn’t do this very well at all.

• I worked out which tube the air would go into when I breathed in and when I
breathed out.

• I managed to breathe in and out with just the right force to make the air bubble
through the limewater.
• I stopped as soon as the limewater in one of the tubes went cloudy.
• I understand what this experiment shows about how much carbon dioxide there
is in inspired air and expired air.

Is there anything that you would do differently if you did this experiment again?

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