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Question

Choose the answer that best completes the statement or answers the question. All multiple-choice questions are 2 points each. A homogenous mixture has regions that are different in composition or phase. a. True b. False Oxygen is: a. a mixture b. an element c. a solution d. a compound e. always combined with hydrogen Ethylene glycol has a density of 1.11 g/mL. What is the volume occupied by 30.0 g of ethylene glycol? a. 0.037 mL b. 33.3 mL c. 31.1 mL d. 30.0 mL e. 27.0 mL Perform the following calculation and express the result with the appropriate number of significant figures. (1.302 + 953.2)/(2.0) = ? a. 477 b. 477.25 c. 477.3 d. 4.80 times 10^2 e. 4.8 times 10^2

Explanation / Answer

1)
homogeneous should have same composition and phase
Answer: False

2)
Oxygen exist as O2
It is a compound
Answer: d

3)
volume = mass/density
= 30.0 g / 1.11 g/mL
= 27.0 mL
Answer: e

4)
(1.302 + 953.2) / 2.0
=954.5 / (2.0)
= 4.8*10^2

Answer: e

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