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Which tools should be used to record the most complete data about a gas?
A
a gas-collecting bottle and an electronic balanceB
a graduated cylinder and a thermometerC
a manometer and a thermometerD
an electronic balance and a manometer22
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When a theory is disproved by further evidence, which of the following occurs?
A
It should be considered a failure.B
It adds to scientific knowledge.C
It becomes a law.D
New data must be found to support it.23
Why do scientists use scientific notation to represent very small and large numbers?
A
accuracy of measured quantitiesB
to simplify the number by using fewer digitsC
number of significant figuresD
precision of measurements24
William adds two values, following the rules for using significant figures in computations. He should write the sum of these two numbers by using
A
the same number of decimal places as the least precise value.B
the same number of decimal places as the most precise value.C
a range of the number of significant figures in the two values.D
an average of the number of significant figures in the two values.25
Andi performs the calculation that is shown below.How should the answer be reported using the correct number of significant figures?
A
3.59B
3.591C
3.6D
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