3. Evaluate the following expression: 18 + (6 - 2)² × 3 4. Express the following sum as a decimal to four significant figures: 1/3 + 3/4 = 5. Solve for the positive value of x that satisfies the following equation: (x + 9)(x - 2) = 60 6. Solve for x to the proper number of significant figures: (0.500)^(x/4.50) = 0.100 7. Solve for x: 14x + 10 = 38 8. Which of the following is a pure substance that cannot be broken down into simpler substances by chemical means? A) Homogeneous mixture B) Chemical compound C) Chemical element D) heterogeneous mixture E) Solution 9. Which one of the following is NOT an example of a compound? A) concrete B) rust (iron oxide) C) carbon dioxide D) ammonia 10. Which one of the following is an example of an element? A) brass B) nickel C) bronze D) sterling silver

3. Evaluate the following expression: 18 + (6 - 2)² × 3 4. Express the following sum as a decimal to four significant figures: 1/3 + 3/4 = 5. Solve for the positive value of x that satisfies the following equation: (x + 9)(x - 2) = 60 6. Solve for x to the proper number of significant figures: (0.500)^(x/4.50) = 0.100 7. Solve for x: 14x + 10 = 38 8. Which of the following is a pure substance that cannot be broken down into simpler substances by chemical means? A) Homogeneous mixture B) Chemical compound C) Chemical element D) heterogeneous mixture E) Solution 9. Which one of the following is NOT an example of a compound? A) concrete B) rust (iron oxide) C) carbon dioxide D) ammonia 10. Which one of the following is an example of an element? A) brass B) nickel C) bronze D) sterling silver

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

ChapterA: Scientific Notation And Experimental Error

Section: Chapter Questions

Problem 10P

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Concept explainers

Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.

Question

3. Evaluate the following expression:

18 + (6 - 2)² × 3

4. Express the following sum as a decimal to four significant figures:

1/3 + 3/4 =

5. Solve for the positive value of x that satisfies the following equation:

(x + 9)(x - 2) = 60

6. Solve for x to the proper number of significant figures: (0.500)^(x/4.50) = 0.100

7. Solve for x:

14x + 10 = 38

8. Which of the following is a pure substance that cannot be broken down into simpler substances by chemical means?

A) Homogeneous mixture

B) Chemical compound

C) Chemical element

D) heterogeneous mixture

E) Solution

9. Which one of the following is NOT an example of a compound?

A) concrete

B) rust (iron oxide)

C) carbon dioxide

D) ammonia

10. Which one of the following is an example of an element?

A) brass

B) nickel

C) bronze

D) sterling silver

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