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Chem 1
Lesson: 6-7 Precision, Accuracy, and significant figures
| Question | Answer |
|---|---|
| It refers to how close a measurement is to the true or accepted value | Accuracy |
| It refers to how close measurements of the same item are to each other | Precision |
| How do you determine the accuracy of the given measurements | Getting the average of the measured values (a1+a2+...+a5)/how many values there are. If the average value is close to the standard value, we can conclude that the measurements are accurate |
| What pertains to the digits or figures that are certain to give reasonably reliable information? | Significant Figures |
| What are Significant Figures? | Significant figures pertain to the digits or figures that are certain to give reasonably reliable information. Significant figures are helpful in attaining a level of certainty when expressing a calculated quantity. |
| Which rule in determining significant figures is rule no.1? | All nonzero digits (1 to 9) are significant |
| Which rule in determining significant figures is rule no.2? | Zeros to the left of the first nonzero digit are not significant |
| Which rule in determining significant figures is rule no.3? | Zeros between nonzero digits are significant |
| Which rule in determining significant figures is rule no.4? | Zeros to the right of a nonzero digit with a decimal point are significant |
| Which rule in determining significant figures is rule no.5? | Zeros at the end of a nonzero digit without a decimal point are not significant |
| How many significant figures does the ff. have? 0.29060 | 5 |
| How many significant figures does the ff. have? 1785 | 4 |
| How many significant figures does the ff. have? 0.02 | 1 |
| How many significant figures does the ff. have? 23.0 | 3 |
| How many significant figures does the ff. have? 0.91 | 2 |
| How many significant figures does the ff. have? 007850 | 3 |
| How many significant figures does the ff. have? 23.0561 | 6 |
| How many significant figures does the ff. have? 1.020000 | 7 |
| How many significant figures does the ff. have? 10203005 | 8 |
| How many significant figures does the ff. have? 50 | 1 |
| How many significant figures does the ff. have? 47.2950 | 6 |
| How many significant figures does the ff. have? 0847020 | 5 |
| How many significant figures does the ff. have? 1.234 | 4 |
| How many significant figures does the ff. have? 0660 | 2 |
| How many significant figures does the ff. have? 8.0 | 2 |
| How many significant figures does the ff. have? 1000 | 1 |
| In addition and subtraction, the number of (BLANK) places in the answer should be the (BLANK) as the number with the (BLANK) decimal places among those being added or subtracted | decimal, same, least |
| In multiplication and division, the answer should have the same number of (BLANK) as the number, among those being multiplied or subtracted, with the (BLANK) number of significant figures. | significant figures, least |
Created by:
annebelle
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