Chemistry Measurement & Estimation Study Guide

1. Unit 1 Chemistry Study guide: Measurement and Estimation *Click on each slide to see the answer

3. Question 1A • How many significant digits are there in the number 123.45? • 5

4. Question 1B • How many significant digits are in the number 0.00670? • 3

5. Question 1C • How many significant digits are there in the number 100.0? • 4

6. Question 2 A • Convert the following number into scientific notation: 3,450,700 • 3.45067 X 106

7. Question 2 B • Convert the following number into scientific notation: 0.00045 • 4.5 x 10 -4

8. Question 2C • Convert the following number into scientific notation: 1,000,000,000.00 • 1 x 10 9

9. Question 3 A • Convert this number from scientific notation into standard notation: 6.02 x 105 • 602,000

10. Question 3B • Convert this number from scientific notation into standard notation: 9.1 x 10 -3 • 0.0091

11. Question 3C • Convert the following number from scientific notation into standard notation: 5.40 x 10 9 • 5,400,000,000

12. Question 4A • What metric unit would be most useful for finding the volume of a swimming pool? • Kiloliter

13. Question 4B • What metric unit would be most useful for finding the distance across a room? • meter

14. Question 4C • What metric unit would be most useful for finding the mass of a paperclip? • gram

15. Question 5A • Convert the following: 50 m to Km • 0.050 Km

16. Question 5B • Convert the following: 0.0067 Kg to cg • 670 cg

17. Question 5C • Convert the following: 12 cm to mm • 120 mm

18. Question 6A • Convert the following: 1.3 x 10 -3 mL to L • 1.3 x 10 -6 L

19. Question 6B • Convert the following: 44 cm to m • 0.44 m

20. Question 6C • Convert the following: 7.4 Kg to g • 7,400 g

21. Question 7A • How many variables and controls should you have in any given experiment? • One variable we are testing, one that will change because of the test and many controls.

22. Question 7B • If we were going to test how sunlight affects the growth of a plant what might be some controls that we would need to have? • Temperature, number of hours of light/dark, amount of food and water, time of day of watering, etc.

23. Question 7C • One of the best ways to illustrate data is with a graph, what is a best fit line? • It is a line that shows the general trend of your data, it gives us the average of the values.

24. Question 8A • Round the following to 3 significant digits:30,450 • 30,400

25. Question 8B • Round the following to 1 significant digit:0.00010 • 0.0001

26. Question 8C • Round the following to 4 significant digits: 1,200,569 • 1,201,000

27. Question 9A • Which of the following values is the most precise? 3.02; 3; 3.0 • 3.02

28. Question 9B • Why is the hundredths place more precise than the tenths? • Because it is a smaller value which indicates smaller (more precise) units on your measuring tool.

29. Question 9C • An object measures exactly 3.445 cm; which of the following is the most accurate? 3.460; 3.500; 3.437 • 3.437

30. Question 10A • What are some tools that we might use to measure volume in the laboratory? • Beaker, graduated cylinders, Erlenmeyer flasks, burette, etc.

31. Question 10B • How are ml and cm3 related to each other? • 1 ml = 1 cm3

32. Question 10C • What is 1000 cm3 equivalent to in liquid volume? • 1L

33. Question 11A • What is the difference between mass and weight? • Mass does not change while weight is dependant on the pull of gravity so can change depending on your location.

34. Question 11B • What types of tools do we use to measure mass? • Balances such as triple beam or double pan.

35. Question 11C • What is the standard unit of measurement for mass? • Kilogram

36. Question 12A • This graph indicates what type of relationship? • Direct

37. Question 12B • What type of relationship does this graph indicate? • Inverse

38. Question 12C • What is the equation for an inverse relationship? • K = yx