Question

A student setup an experiment to study the human respiratory system. In the experiment, the student places candle and a living cockroach in the flask A, while a candle and a dead cockroach in flask B. The burning of candle needs oxygen. After 10 minutes, the student observes that the candle in flask A extinguish faster while candle in flask B keeps burning for a longer time. What can be evaluated from this experiment?
1 point
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(a) candle produces high amount of carbon dioxide
(b) living beings consumes oxygen during respiration
(c) burning of candle decreases the life span of cockroach
(d) water vapours produced by living beings prevents burning of candle​

Answer 1

Explanation:

I think the answer is (a)

I hope it helps you

Answer 2

A candle that produces a high amount of carbon dioxide can be evaluated from this experiment.

Explanations

• This is because candles also emit carbon dioxide.  

• Most candles are made from paraffin, a heavy hydrocarbon made from crude oil.  

• Burning a paraffin candle for 1-hour releases about 10 grams of carbon dioxide.  

• Another factor is that carbon dioxide is much more soluble in water than other air components, so it may disappear from the glass over time (if not immediately), freeing up more space.

• Another factor is that the air in the glass is quite hot while the candle is burning. It shrinks as soon as it cools.