Chemistry Reference
In-Depth Information
18. Which of the following represents a compound?
a) Co b) He c) Ar d) NO
19. Which of the following is made up of more than one type of atom?
a) gold
b) table salt
c) silver
d) oxygen
20. Which of the following is an example of a chemical property?
a) conductivity c) luster
b) hardness d) reactivity to acid
21. Which of the following is an extensive property?
a) volume
b) melting point c) density
d) ductility
22. Which of the following is an example of a chemical change?
a) breaking glass c) melting metal
b) rusting iron d) cutting wood
23. Which of the following is an example of a physical change?
a) photosynthesis
c) sublimation of carbon dioxide
b) burning gasoline
d) zinc reacting with acid
Part III—Short Essay
Answer the following questions in a few sentences.
24. Compare and contrast mixtures and compounds.
25. Explain the Law of Conservation of Energy.
Answer Key
The actual answers will be shown in brackets, followed by the explana-
tion. If you don't understand an explanation that is given in this section, you
may want to go back and review the lesson that the question came from.
Lesson 1-1 Review
1.
[element]
2.
[mixture]—You might have said “solution, “homogeneous mixture,” or
“heterogeneous mixture,” which are also true answers. “Mixture” is the
most general of the possible correct answers.
3.
[compound]—Remember: The key is that the elements in a compound are
chemically combined. If the question asked about things that are physically
combined, the answer would have been a “mixture.”
