Measuring Accuracy v Precision pg 8 Precision how

Accuracy v. Precision pg. 8 Precision - how closely the measurements match each other.

How To Read Scientific Instruments • 1) Record the _______ digit on the instrument.

How to Count Significant Figures 1. Count all of the digits you are sure

Percent Error • When quantities have accepted or true values, we can calculate the

How to Read a Graduated Cylinder • Sit the graduated cylinder on a level

1) Measuring Length A. B. C. D. 2 cm 19 cm 1. 95238 cm

2) Measuring Length A. B. C. D. 10 cm 1. 1 cm 1. 05

3) Measuring Length A. B. C. D. 17 cm 17. 5 cm 18. 0

4) Measuring Length A. B. C. D. 4 cm 4. 30 cm 4. 3057

5) Measuring Length A. B. C. D. 12 cm 12. 0 cm 12. 7

6) Measuring Liquids • The meniscus is the curve in the upper surface of

7) Measuring Liquid Volume A. 10 ml B. 10. 3 ml C. 11. 5

8) Measuring Liquid Volume A. B. C. D. 266 ml 287 ml 290 ml

9) Measuring Liquid Volume A. 52 ml B. 53 ml C. 54. 5 ml

10) Measuring Liquid Volume A. 80 ml B. 80. 0 ml C. 81. 0

11) Measuring Liquid Volume A. 2. 8 ml B. 2. 80 ml C. 2.

12) Measuring Liquid Volume A. 4. 90 ml B. 4. 80 ml C. 5.

13) Measuring Solids A. 625. 62 g B. 26. 57 g C. 265. 73

14) Measuring Solids A. 373. 33 g B. 734. 33 g C. 374. 33

15) Measuring Solids A. 222. 50 g B. 221. 50 g C. 221. 5

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Measuring

Accuracy v. Precision pg. 8 Precision - how closely the measurements match each other. Instruments that measure using more decimals are more precise. Accuracy – how closely the measurement matches the true or accepted value.

Accurate Precise

How To Read Scientific Instruments • 1) Record the _______ digit on the instrument. • 2) Then ________ the last digit.

How to Count Significant Figures 1. Count all of the digits you are sure of. 2. Add the last digit you estimate.

Percent Error • When quantities have accepted or true values, we can calculate the percent error between our measurement of the value and the accepted value with the formula

How to Read a Graduated Cylinder • Sit the graduated cylinder on a level surface. • Lower your eyes to the level of the liquid (called the meniscus). • Take your reading from the bottom of the meniscus. • Count all of the digits you are sure of. • Add the last digit that you estimate.

Quiz • Number your paper 1 to 15.

1) Measuring Length A. B. C. D. 2 cm 19 cm 1. 95238 cm

2) Measuring Length A. B. C. D. 10 cm 1. 1 cm 1. 05 cm 1. 526 cm

3) Measuring Length A. B. C. D. 17 cm 17. 5 cm 18. 0 cm 17. 5082 cm

4) Measuring Length A. B. C. D. 4 cm 4. 30 cm 4. 3057 cm

5) Measuring Length A. B. C. D. 12 cm 12. 0 cm 12. 7 cm 12. 0953 cm

6) Measuring Liquids • The meniscus is the curve in the upper surface of a liquid close to the surface of the container or another object, caused by surface tension. It can be either convex or concave. Is this meniscus convex or concave? 6) _________ For questions 7 to 12, measure the amount of liquid in each graduated cylinder by reading the bottom of the meniscus.

7) Measuring Liquid Volume A. 10 ml B. 10. 3 ml C. 11. 5 ml D. 13. 0 ml

8) Measuring Liquid Volume A. B. C. D. 266 ml 287 ml 290 ml 294 ml

9) Measuring Liquid Volume A. 52 ml B. 53 ml C. 54. 5 ml

10) Measuring Liquid Volume A. 80 ml B. 80. 0 ml C. 81. 0 ml

11) Measuring Liquid Volume A. 2. 8 ml B. 2. 80 ml C. 2. 90 ml

12) Measuring Liquid Volume A. 4. 90 ml B. 4. 80 ml C. 5. 0 ml D. 5. 0853 ml

13) Measuring Solids A. 625. 62 g B. 26. 57 g C. 265. 73 D. 526. 6 g

14) Measuring Solids A. 373. 33 g B. 734. 33 g C. 374. 33 g D. 373. 3 g

15) Measuring Solids A. 222. 50 g B. 221. 50 g C. 221. 5 g