Baird Chem in Your life Chapter 02
1. Which of the following would be a chemical property of iron?
a. It rusts
b. It is malleable
c. It has volume
d. It has mass
a: Rusting is a chemical reaction of iron and oxygen that forms a new substance.
2. Dissolving is different from melting because ______.
a. a solvent is needed and heat does not need to available
b. it always forms ions
c. it always needs heat for a change to take place.
d. it happens at a specific temperature.
a: Dissolving is a process that requires a solvent. Melting always needs heat energy to take place.
3. When a liquid changes to a gas it is called______.
a. evaporation
b. condensation
c. sublimation
d. boiling
a: Evaporation occurs when a liquid forms a gas below its normal boiling point.
4. The vapor pressure of a liquid ______.
a. increases with an increase of temperature
b. increases with an increase of temperature
c. decreases with a decrease of temperature
d. stays the same with an increase of temperature
a: This is illustrated by Figure 2.10 on page 43.
5. The boiling point of a liquid is defined as ______.
a. the temperature at which the vapor pressure equals the atmospheric pressure
b. the temperature at which vapor pressure forms
c. the temperature at which the condensation point equals the atmospheric pressure
d. the temperature when the liquid forms bubbles
a: This is defined on page 44.
6. Which of the following represents a chemical property of gold?
a. It does not oxidize.
b. It can form alloys.
c. It does not float on water.
d. It is malleable.
a: The ability of a solution not to oxidize is a sign of a chemical property just as the ability of a substance (such as iron) to oxidize is.
7. Balance the following reaction: C2H5OH + O2 CO2 + H2O.
a. 1,3,2,3
b. 2,3,4,6
c. 1,4,2,3
d. 2,6,4,8
a: This answer shows 2C, 6H, and 7O on the reaction side and 2C, CH, and 7O on the product side.
8. The product of combustion is always ______.
a. CO2
b. H2O
c. CO + H2O
d. CO + H2O
a: This answer is found on page 52 as compared to burning that does not require CO2 .
9. A common by-product of incomplete combustion is _____.
a. soot
b. carbon
c. carbon dioxide
d. carbon tetrachloride
a: A powdered form of carbon is called soot.
10. The decimal equivalent of 4 ppm of CO in the air is equal to _____.
a. .000004
b. .0004
c. .004
d. .0000004
a: When 4 is divided by 1,000,000 the answer is .000004 (six places).
11. What is the ppm if there are 12 molecules per 100,000?
a. 120 ppm
b. 12 ppm
c. 1.20 ppm
d. 1200 ppm
a: When 100,000 is multiplied by 10 to get 1 million, you must multiply the 12 by 10.
12. What concentration of CO exposure would be lethal to a healthy adult in one hour?
a. 1600 ppm
b. 400 ppm
c. 800 ppm
d. 1200 ppm
a: This is from Table 2.1.
13. What is the maximum concentration in an 8-hour period that a healthy person could be exposed to
CO without risk?
a. 9 ppm
b. 5 ppm
c. 15 ppm
d. 20 ppm
a: This is from Table 2.1, as stated by guidelines from the U.S. government.
14. What metal is placed in a baking soda solution to remove the tarnish from silver?
a. aluminum
b. barium
c. calcium
d. zinc
a: The metal aluminum will react with tarnished silver (Ag2S) and replace the silver.
15. What gas is released in a car’s air bag when it inflates in a collision?
a. nitrogen
b. oxygen
c. nitrogen dioxide
d. carbon dioxide
a: From page 60, the reaction of sodium azide (NaN3) releases the gas N2 chemically.