Calculating with Significant Figures

Why are significant figures important in chemistry calculations?

• They help in identifying chemical compounds.

• They are used to determine molecular weights.

• They ensure precision and accuracy in measurements.

• They help in balancing chemical equations.

When performing addition and subtraction, to which decimal place should you round your answer?

• To the highest number of decimal places in the problem.

• To the least number of decimal places in the problem.

• To the nearest whole number.

• To the nearest tenth.

If you add 22.4 and 3.52, what is the correct rounded result?

• 26.0

• 25.9

• 25.92

• 25.8

How do you round a number without a decimal place in subtraction?

• To the leftmost digit that is not zero.

• To the nearest ten.

• To the nearest whole number.

• To the nearest hundred.

What is the result of 30 minus 6.5 rounded to the correct significant figure?

• 23.5

• 24

• 20

• 30

In multiplication and division, to how many significant figures should you round your answer?

• To the highest number of significant figures in the problem.

• To the nearest tenth.

• To the least number of significant figures in the problem.

• To the nearest whole number.

What is the result of multiplying 4.56 by 3.2 rounded to the correct significant figures?

• 14.6

• 14.592

• 14.59

• 15

If you divide 17.33 by 3.3, what is the correct rounded result?

• 5.25

• 5.3

• 5.2

• 5.33

When performing combined operations, when should you round your answer?

• After each operation.

• Before starting the operations.

• Only at the end of all operations.

• After addition and subtraction, but before multiplication and division.

What is the final result of (5.32 + 6.251) / 2.00 rounded to the correct significant figures?

• 5.7855

• 5.79

• 5.8

• 5.78