1. Unit 1&2 Exam Review Questions
Items to look for in your notes:
Everything!!! 

2. Filtration Techniques for Mixtures
Here are the five (5) types of separation:
Solubility
Separation of various substances by their abilities to dissolve
Magnetism
Separation of metallic substances by use of their magnetic property
Chromatography
Separation of substances that are mixed within a liquid by a special type of paper
Distillation
Separation of substances that are mixed within a liquid by difference in boiling point
Filtration
Separation of a solid from a liquid using a piece of filter paper

3. Before using a bunsen burner, be safe by making sure your…
Hair is tied back
Goggles are on

4. This symbol represents chemicals that are ______ hazards
Fire

5. This symbol represents chemicals that are ___________
Highly Corrosive

6. Which of these would be best to measure 45 mL of water? A) B) C)
B, the graduated cylinder (more gridlines = more precise measurement)

7. What must be on file for all chemicals in the stockroom?
MSDS – material safety data sheet

8. Which of the following behaviors are not permitted in the chemistry lab? (answer all that are correct)
writing
sandals
contact lenses
lighting a bunsen burner
running
talking
boots
calling 911
eating
using a calculator
using the eyewash
entering the stockroom
washing hands
c, e, h, and m
CHEM !!

9. All matter has both mass and _____
volume

10. Which of the following units would be used to express a density. cm2
Which of the following units would be used to express a density? cm2 g/m g/mL ml/L
g/mL (mass/volume)

11. Which state of matter has the least amount of Kinetic Energy (KE)
Which state of matter has the least amount of Kinetic Energy (KE)? Solid Liquid Gas
solid

12. Which state of matter is the easiest to compress? Solid Liquid Gas
Gas (particles are the furthest apart from each other)

13. Which of these properties could be used to identify an unknown substance? Length density mass volume
Density (an intensive physical property)

14. Which of these properties could be considered a chemical property
Which of these properties could be considered a chemical property? length density reactivity weight volume conductivity
Reactivity (describes how the substance can go through a chemical change)

15. Which of the following is an example of a physical change
Which of the following is an example of a physical change? A) burning B) melting C) reacting with acid D) decomposing
B) Melting (just spreading molecules)

16. Which of the following is an example of a chemical change
Which of the following is an example of a chemical change? A) ice cubes freezing B) salt dissolving in water C) grinding sugar into fine powder D) iron rusting
D) iron rusting

17. A beaker contains separate layers of sand, salt, and sugar
A beaker contains separate layers of sand, salt, and sugar. The contents of the beaker are a- A) homogeneous mixture B) heterogeneous mixture C) element D) compound
B) Heterogeneous mixture

18. Aluminum oxide is a solid composed of aluminum and oxygen atoms chemically bonded together. Aluminum oxide is a - A) homogeneous mixture B) heterogeneous mixture C) element D) compound
D) compound

19. Pencil lead is not actually lead, but graphite
Pencil lead is not actually lead, but graphite. Graphite is flat sheets of carbon atoms. Graphite can best be described as – A) a homogeneous mixture B) a heterogeneous mixture C) an element D) a compound
C) an element (the element carbon)

20. Bleach is a solution of sodium hypochlorite dissolved in water
Bleach is a solution of sodium hypochlorite dissolved in water. The sodium hypochlorite is evenly mixed throughout the water. Bleach is an example of – A) a homogeneous mixture B) a heterogeneous mixture C) an element D) a compound
A) Homogeneous mixture

21. Sodium hypochlorite (NaClO) is the active substance in bleach
Sodium hypochlorite (NaClO) is the active substance in bleach. It can be chemically separated into sodium, chlorine, and oxygen atoms. Sodium hypochlorite is an example of - A) a homogeneous mixture B) a heterogeneous mixture C) an element D) a compound
D) a compound

22. Water and alcohol have different boiling points, so how would they be able to be separated?
distillation

23. A mixture of sand and water could be separated using this technique
filtration

24. Which of these numbers has the most significant figures. 8. 02 E 5
(6 SF)

25. Round this number so that it has 3 significant figures: 3187.21
3190

26. Perform the following calculation and express your answer to the proper number of significant figures: 14 mL mL
6 mL

27. Perform the following calculation and express your answer to the proper number of significant figures: g / 7.3 mL
6.6 e -1
0.66 g/mL

28. Perform the following calculation and express your answer to the proper number of significant figures: cm x cm x cm
1.87 cm3

29. What volume in mL would you record from this beaker?30 20 10
16 mL (or 17 mL, or 13 mL, etc.)

30. 1.3 cm or 1.2 cm or 1.5 cm Even 1.8 cm would be an acceptable answer
How long is this object?
1.3 cm or 1.2 cm or 1.5 cm
Even 1.8 cm would be an acceptable answer

31. How long is this object? 1.45 cm or 1.43 cm or 1.48 cm
1.4 cm or 1.5 cm would not be an acceptable answer

32. What temperature does this thermometer read?
30.0o is correct, and so is 30.1o or 29.9o

33. Record mL measurements and the number of sig figs for these:

34. Change this number to scientific notation: .0006015 g
6.015 x 10-4 g

35. Convert 12.5 g into ounces (1 ounce = 28.35 g)

36. Perform the following calculation and express your answer to the proper number of significant figures: X 10-5 g / X 10-8 cm3
2.7 X 102 g/cm or g/cm3

37. Convert the previous answer into the following unit: kg/m3
Convert g to kg; 1000g = 1kg
Convert cm3 to m3 ; 100cm = 1m
You must convert cm to m three times in order to get m3
270,000 kg/m3 or X 105 kg/m3

38. You place a marble on a scale and measure its mass to be 8. 450 g
You place a marble on a scale and measure its mass to be g. You fill a graduated cylinder and measure its volume to be 34.5 mL. After placing the marble in the cylinder, the water level rises to 39.7 mL. Calculate the density of the marble.
Subtract the initial volume from the final volume to get the volume of the marble (5.2; 2 SF due to the addition subtraction rule))
Divide mass by volume to get density
Answer: 1.6 g/mL (2 SF due to the multiplication rule)