1. Unit 1 Review

2. What are 3 safety precautions you should always take in the lab when working with a Bunsen Burner?

3. Answer Wear goggles Never reach over an open flame No horseplay
Never point a test tube directly at you or others when heating.
Don’t wear baggy clothing.

4. A ruler was used to measure the length of a piece of copper
A ruler was used to measure the length of a piece of copper. The length of this piece of metal was cm.
How many sig figs are in this measurement?
Place a bar over the estimated digit.

5. Answer
4 sig figs
Bar over the zero

6. Why do we use a graduated cylinder to measure liquid volume instead of a beaker? Be specific!

7. Answer
More increments leads to greater precision.

8. What unit is used to measure mass in chemistry?
What units are used to measure volume in chemistry? (2)

9. Answer
Grams (g)
Cubic centimeters (cm3) or milliliters (mL)

10. Which of the following are physical properties?
Sugar is a white, crystalline solid.
Acids neutralize bases to form salt and water.
Magnesium burns in a flame.
The density of copper is 8.96 g/cm3

11. Answer Sugar is a white, crystalline solid.
The density of copper is 8.96 g/cm3

12. List 2 intensive and 2 extensive physical properties about 25 mL of Sprite. The mass of this sample is g.

13. Answer Intensive: Sprite is transparent Tastes sweet Colorless
Extensive:
25 mL
14.86 g

14. Which of the following can be classified as pure substances?
Water
Sugar
Koolaid
Saltwater
Salt
Homogeneous mixtures
Compounds
Elements

15. Answer
Water
Sugar
Salt
Elements
Compounds

16. Which of the following are chemical changes?
Milk souring
Sublimation
Deposition
Melting
Fireworks being lit
Cutting hair
Making cookies

17. Answer
Milk souring
Fireworks being lit
Making cookies

18. Calculate the following using the correct number of sig figs and units:
6.99 cm x 10. cm =
3 m3 /45 m2 =

19. Answer
70. cm2
.07 m

20. Calculate the following using the correct number of sig figs and units:
5.2 m m m =
568.2 g g - .1 g =

21. Answer
511 m
568.1 g

22. Calculate and report your answer in scientific notation
(6.2 x 103) x (3.876 x 10-5)
(5.70 x 103) / (2.10 x 105)

23. Answer
2.4 x 10-1
2.71 x 10-2

24. Write the following numbers in scientific notation:

25. Answer
4 x 106
2.50 x 10-4

26. Write the following in standard form:
6.8 x 10-5
2.896 x 107

27. Answer

28. Determine how many sig figs are in the following measurements?
10 basketball players m
1000 g

29. Answer
10 or 2 4 1

30. Determine how many sig figs are in the following measurements?
45600 mL
4.50 x 106 s cm

31. Answer 3 5

32. Round each calculation to the number of sig figs requested.
75000 (1)
(3)
45890 (4)

33. Answer
80000
8.00
45890

34. Which state of matter is characterized by:
A definite shape and volume, particles packed very close together, vibrational movement.
No definite shape and volume, particles are spread very far apart and moving fast.
A definite volume, but not shape.

35. Answer
Solid
Gas
liquid

36. Suppose you have a sample of unknown metal with a mass of 30. 00 g
Suppose you have a sample of unknown metal with a mass of g. You place this sample in a graduated cylinder filled with water to the 34.0 mL mark. The sample sinks to the bottom and the water level rises to 55.0 mL. What is the density of this sample?

37. Answer
1.43 g/mL

38. A liquid with a mass of 3. 75 g has a density of. 789 g/mL
A liquid with a mass of 3.75 g has a density of .789 g/mL. What is the volume of this liquid?
Would it float or sink in water? How do you know? The density of water is 1.00 g/mL.

39. Answer
4.75 mL
It would float because the density of ethanol is less that the density of water.

40. Convert using dimensional analysis and report answer in scientific notation:
45 g  mg

41. Answer
4.5 x 104 mg

42. Convert using dimensional analysis and report answer in scientific notation:
678 hm  m

43. Answer
6.78 x 104 m

44. Convert using dimensional analysis and report answer in scientific notation:
4.28 dag  Mg

45. Answer
4.28 x 10-5 Mg

46. Convert using dimensional analysis and report answer in scientific notation:
328 mL  μL

47. Answer
3.28 x 105 μL