Significant Figures in Chemistry

This video tutorial covers the concept of significant figures, explaining their importance in indicating the accuracy of data. It outlines the rules for determining significant figures, including the Atlantic-Pacific rule as a shortcut. The tutorial provides examples and practice exercises to help understand the application of these rules. Additionally, it discusses rounding numbers to significant figures, offering practical examples to illustrate the process.

Why are significant figures important in scientific measurements?

• They are used to convert units.

• They indicate the precision of the measurement.

• They help in identifying the type of measurement tool used.

• They determine the speed of data collection.

Which of the following numbers has three significant figures?

• 0.005

• 0.050

• 500

• 5.00

According to the rules, when is a zero considered significant?

• When it is at the end of a number without a decimal.

• When it is at the end of a number with a decimal.

• When it is at the beginning of a number.

• When it is between two non-zero digits.

What does the 'Pacific' in the Atlantic-Pacific Rule signify?

• Count from the middle.

• Count from the right.

• Decimal is present.

• Decimal is absent.

Using the Atlantic-Pacific Rule, how many significant figures are in 0.00450?

• 5

• 4

• 3

• 2

If a number is 0.00780, how many significant figures does it have?

• 4

• 3

• 5

• 2

When rounding 62.5347 to four significant figures, what is the result?

• 62.534

• 62.535

• 62.54

• 62.53

How should you round 3.78721 to three significant figures?

• 3.8

• 3.787

• 3.79

• 3.78

What is the rounded value of 726.835 to five significant figures?

• 726.83

• 726.835

• 726.84

• 726.836

When rounding 743,513 to three significant figures, what should be the result?

• 743,500

• 743,000

• 744,000

• 743