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Describe an activity to show that exhaled air contains catu |
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Answer» (A, B and C refer to the tubes unless specified) Close end of B. Breathe in. Air from atmosphere enters through A, passes through limewater and enters your mouth (cannot enter through B because closed). Open end of B and close end of A. Breathe out. Exhaled air passes through limewater in test tube B and exits through B. Limewater in test tube B (which contained the air you exhaled) turns milky much faster than in test tube A (which contained the air you inhaled). |
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