Question: All of the following are examples of units EXCEPT

1. ounce

2. B. kilometer

3. C. gram

4. D. mass

5. Answer: D. Mass

6. Question: The symbols for units of length in order from largest to smallest are

7. Answer: km, m, cm, mm

8. Question: Which of the following observations is qualitative?

9. A. the solid had a mass of 23.4 grams

10. B. the pH of a liquid was 5

11. C. salt crystals formed as the liquid evaporated

12. D. a chemical retain was complete in 2.3 seconds

13. Answer: C. salt crystals formed as the liquid evaporated

14. Question: Three samples of 1.12g, 1.8g, and 1.562g are mixed together. The combined mass of the three samples, expressed to the correct number of significant figures, would be recorded as

15. Answer: 4.5g

16. Question: These values were recorded as the mass of products when a chemical reaction was carried out three separate times: 8.83g; 8.84g; 8.82g. The mass of products from that reaction is 8.83g. The values are

17. Answer: both accurate and precise

18. Question: Which of these is NOT an SI base unit?

19. A. liter

20. B. kilogram

21. C. Kelvin

22. D. second

23. Answer: liter

24. Question: The average distance between the earth and the moon is 386,000 km. Expressed in scientific notation, this distance is written as

25. Answer: 3.86x10^5 km

26. Question: The capacity of a Florence flask is 250 mL. Its capacity in liters expressed in scientific notation is

27. Answer: 2.5x10^-1 L

28. Question: A measurement that closely agrees with an accepted value is best described as

29. Answer: accurate

30. Question: A numerical result is said to have good precision if

31. Answer: repeated measurements agree closely