Chapter 2 Matter Test B
Use the Scrantron and a pencil to record your answers
Answer the following questions True (A) or False (B)
1. A pure substance made of two or more elements that are chemically combined is a mixture.
2. An element is a pure substance that cannot be broken down into any other substances by chemical means.
3. During a chemical change, the form of a substance is altered, but not its identity.
4. Steel rod being heated into a molten metal is an example of a phase change.
5. Ice is an example of the liquid state of matter.
6. Inferences are observations made by using your five senses.
7. A dependent (responding) variable is the factor in an experiment that is purposely changed to test a hypothesis.
Read the statement and identify whether it is a Chemical or Physical Change. Answer the following questions Chemical (A) or Physical (B) Change
8. Eating and digesting cheese pizza.
9. Iodine turning a piece of bread black.
10. Crumbling a piece of paper.
11. Ice melting
12. A solid is crushed into a powder
Choose the letter of the best answer.
13. Which of the following is an example of a physical property?
a. color b. ability to rust
c. flammability d. ability to combust
14. Which of the following is NOT a characteristic of a compound?
a. has different properties from the elements that formed it
b. pure substance made of two or more elements
c. different samples have different properties
d. can be represented by a chemical formula
15. ____ is an example of a homogenous mixture that is very evenly mixed.
a. MnMs b. chocolate chip cookies c. salad d. sugar water
16. The parts of a mixture
a. Cannot be separated
b. Can be separated
c. Have new properties after they are mixed.
d. form a chemical combination of two or more atoms.
17. Anything that has mass and takes up space is an example of
a. energy. b. chemical change. c. matter. d. temperature.
18. Which of the following is NOT true of atoms?
a. They are composed of molecules.
b. They can combine with other atoms.
c. They make up elements.
d. They are extremely small.
19. A(n) ______of a pure substance can be observed without changing the substance.
a. chemical property b. atom c. element d. physical property
20. A compound
a. is the same as a mixture
b. has the same properties as the elements it is made of
c. has different properties from the elements it is made of
21. If you describe methane as a gas that easily catches fire, you are describing a
a. chemical formula b. chemical property
c. physical property d. state of matter
22. New substances are always formed when matter undergoes a ___.
a. change in shape b. physical change
c. change in temperature d. chemical change.
23. Which of the following is an example of a chemical change?
a. melting butter b. mixing milk and chocolate syrup
c. breaking a pencil d. burning a marshmallow
24. Which of the following is an example of a heterogeneous mixture?
a. salt water b. brass c. salad d. tomato soup
25. Substances that CANNOT be broken down chemically into other substances are
a. elements b. compounds c. mixtures d. solutions
Significant Figures: how many significant figures are in each number?
26. 1000 a. 4 b. 3 c. 1
27. 780 a. 1 b. 2 c. 3
28. 1.20 a. 3 b. 2 c. 1
Read this for the next two problems: When a 125 g obsidian rock is placed into a graduated cylinder, the water level rises from the 15 mL to the 47 mL mark.
29. What is the rocks volume?
a) 62 mL b) 32 mL c) 15 mL d) 47 mL
30. What is the rocks density?
a) 0.25 g/mL b) 1 g/mL c) 2.0 g/mL d) 3.9 g/mL
31. If you add a mass of 3.7 g to a mass of 9.495 g, the sum with the correct number of significant digits is
a) 13.2 g b) 13.20 g c) 13.19 g d) 13.195 g
Identify the figures below as either a pure substance (A) or a mixture (B).