4. The word "properties" in line 10 is closest in meaning to
(A) interpretations
(B) locations
(C) characteristics
(D) virtues

50. Where in the passage does the author mention factors that might prevent people from enjoying themselves? (A) Lines 3-5 (B) Lines 12-14 (C) Lines 17-20 (D)Lines 25-27

1. What does the passage mainly discuss? (A) The chemical composition of phlogiston. (B) Attempts to explain what happens when materials burn. (C) Limitations of seventeenth-century scientific theories. (D) The characteristics of the residue left after fires.

2. The word "it" in line 4 refers to (A) burning (B) phlogiston (C) combustible material (D) air

3. The "phlogiston transfer" mentioned in line 5 is a term used to describe the (A) natural limits on the total volume of phlogiston (B) absence of phlogiston in combustible material (C) ability of phlogiston to slow combustion (D) release of phlogiston into the air from burning material

5. The phrase "ascribed to" in line 10 is closest in meaning to (A) analyzed and isolated in (B) returned to their original condition in (C) assumed to be true of (D) diagrammed with

6. The author mentions magnesium in line 14 as an example of a substance that (A) seemed to have phlogiston with a negative weight (B) leaves no residue after burning (C) was thought to be made of nearly pure phlogiston (D)was thought to contain no phlogiston

7.The "different materials" mentioned in line 17 were considered different because they (A) required more heat to burn than other substances did (B) burned without leaving much residue (C) were more mysterious than phlogiston (D) contained limited amounts of phlogiston

8. The word "constituent" in line 19 is closest in meaning to (A) component (B) opposite (C) principle (D) temperature

9. The word "Since" in line 20 is closest in meaning to (A) later (B) because (C) during (D) although

10. Which of the following is true of both the phlogiston theory of burning and Lavoisier's theory of burning? (A) Both theories propose that total weight always increases during burning. (B) Both theories are considered to be reasonable and straightforward. (C) Both theories have difficulty explaining why residue remains after burning. (D)Both theories recognize that air is important to combustion.