Question

A student wants to compare the amounts of CO2 given off by yeast provided

with different amounts of sugar. The student places a balloon over each

container to catch the released CO2. Which observation is a quantitative

observation the student can make to compare the amounts of CO2 given off?

O

A. The relative size of each filled balloon

O

B. The shape of each filled balloon

O

C. The weight of each filled balloon

O

D. The temperature of each filled balloon

Answer 1

The weight of each filled balloon

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Answer 2

C. The weight of each filled balloon

Step-by-step explanation:

If the two balloons are the same and made of the same material, the student can observe the weight of each filled balloon to determine if the two balloons have the same amount of gas.

For this, he must have access to a precision scale, to position an empty balloon, to know what weight a balloon has when it is empty. Then, he must position each balloon filled with gas at a time, look at the weight indicated by the scale and subtract the weight of the empty balloon. If after that, the balloons show the same result, it means that the balloons have the same amount of the same gas.