Multiple Choice
Which of the following is not an accurate statement regarding experimental error?
1. Intro to General Chemistry
Significant Figures
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Which of the following has the largest number of significant figures?
A
21
B
2.10 × 104
C
0.000021
D
200.1
E
0.0020010
Verified step by step guidance1
Identify the number of significant figures in each given number. Significant figures are the digits in a number that contribute to its precision, including all non-zero digits, any zeros between significant digits, and any trailing zeros in the decimal portion.
For the number '21', count the significant figures. Since both digits are non-zero, it has 2 significant figures.
For '2.10 × 10^4', count the significant figures in the coefficient '2.10'. The digits '2', '1', and the trailing zero are all significant, giving it 3 significant figures.
For '0.000021', count the significant figures. The leading zeros are not significant, so only the digits '2' and '1' are significant, resulting in 2 significant figures.
For '200.1', count the significant figures. The digits '2', '0', '0', and '1' are all significant because the trailing zero is in the decimal portion, giving it 4 significant figures. Therefore, '200.1' has the largest number of significant figures among the options provided.
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Multiple Choice
How many significant figures are contained in the following measurement?
3,482,005 mg
Textbook Question
A scientist uses an uncalibrated pH meter and measures the pH of a rainwater sample four times. A different pH meter was calibrated using several solutions with known pH. The true pH of the rain was found by the calibrated pH meter to be 5.12. What can be said about the level of accuracy and precision of the uncalibrated pH meter? (LO 1.14)(a) The uncalibrated pH meter is accurate and precise. (b) The uncalibrated pH meter is neither accurate nor precise. (c) The uncalibrated pH meter is accurate but not precise. (d) The uncalibrated pH meter is precise but not accurate.
