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Chapter 1 Review - Week 2, Exercises of Chemistry

Selected exercises chapter 1 review, Chemistry Nivaldo Tro

Typology: Exercises

2021/2022

Uploaded on 12/17/2023

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CHEM 107 SI Session Week 2 Day 1 (Chapter 1)
1. Determine whether each molecular diagram represents a pure substance or a mixture. If it
represents a pure substance, classify the substance as an element or a compound. If it represents a
mixture, classify the mixture as homogeneous or heterogeneous.
2. Classify each of the listed properties of ozone (a pollutant in the lower atmosphere but part of
a protective shield against UV light in the upper atmosphere) as physical or chemical.
a) bluish color
b) pungent odor
c) very reactive
d) decomposes on exposure to UV light
e) gas at room temperature.
3. Are the following changes chemical or physical? Explain.
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CHEM 107 SI Session Week 2 Day 1 (Chapter 1)

  1. Determine whether each molecular diagram represents a pure substance or a mixture. If it represents a pure substance, classify the substance as an element or a compound. If it represents a mixture, classify the mixture as homogeneous or heterogeneous.
  2. Classify each of the listed properties of ozone (a pollutant in the lower atmosphere but part of a protective shield against UV light in the upper atmosphere) as physical or chemical. a) bluish color b) pungent odor c) very reactive d) decomposes on exposure to UV light e) gas at room temperature.
  3. Are the following changes chemical or physical? Explain.
  1. Calculate the following to the correct number of significant figures.

a) [ ( 1.7 × 106 ) ÷ ( 2.63 × 105 ) ] +7.

b) (568.99−232.1) ÷ 5.

  1. An ibuprofen suspension for infants contains 100 mg/5.0 mL suspension. The recommended dose is 10 mg/kg body weight. How many mL of this suspension should be given to an infant weighing 18 lb? Use 1 lb = 0.45 kg. (Assume two significant figures.)

  2. A volatile liquid (one that easily evaporates) is put into a jar, and the jar is then sealed. Does the mass of the sealed jar and its contents change upon the vaporization of the liquid?

  3. Explain how the potential energy between two opposite charge changes as a function of the distance between them.

  4. ( Challenge yourself!) Suppose that polluted air has carbon monoxide (CO) levels of 15.0 ppm. An average human inhales about 0.50 L of air per breath and takes about 20 breaths per minute. How many milligrams of carbon monoxide does the average person inhale in an 8-hour period at this level of carbon monoxide pollution? Assume that the carbon monoxide has a density of 1. g/L. (Hint: do you know what ppm means?)