Back
Problem 44
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 ultraviolet light e. gas at room temperature
Problem 45
Classify each property as physical or chemical. a. the tendency of ethyl alcohol to burn b. the shine on silver c. the odor of paint thinner d. the flammability of propane gas
Problem 46
Classify each property as physical or chemical. a. the boiling point of ethyl alcohol b. the temperature at which dry ice evaporates c. the tendency of iron to rust d. the color of gold
Problem 47
Classify each change as physical or chemical. a. Natural gas burns in a stove. b. The liquid propane in a gas grill evaporates because the valve was left open. c. The liquid propane in a gas grill burns in a flame. d. A bicycle frame rusts on repeated exposure to air and water.
Problem 48
Classify each change as physical or chemical. a. Sugar burns when heated in a skillet. b. Sugar dissolves in water. c. A platinum ring becomes dull because of continued abrasion. d. A silver surface becomes tarnished after exposure to air for a long period of time.
Problem 49
Based on the molecular diagram, classify each change as physical or chemical.
Problem 50
Based on the molecular diagram, classify each change as physical or chemical.
Problem 51
Convert each temperature. a. 32 °F to °C (temperature at which water freezes) b. 77 K to °F (temperature of liquid nitrogen) c. -109 °F to °C (temperature of dry ice) d. 98.6 °F to K (body temperature)
- The coldest temperature ever measured in the United States is -80 °F, recorded on January 23, 1971, in Prospect Creek, Alaska. What are the equivalents of that temperature in °C and K, assuming -80 °F is precise to two significant figures?
Problem 53
Problem 54
The warmest temperature ever measured in the United States is 134 °F, recorded on July 10, 1913, in Death Valley, California. Convert that temperature to °C and K.
Problem 55a
Use the prefix multipliers to express each measurement without exponents. a. 1.2×10−9 m
Problem 55b
Use the prefix multipliers to express each measurement without exponents. b. 22×10−15 s
Problem 55d
Use the prefix multipliers to express each measurement without exponents. d. 3.5×106 L
Problem 56a,c,d
Use prefix multipliers to express each measurement without exponents. a. 38.8×105 g c. 23.4×1011 m d. 87.9×10−7 L
Problem 56b
Use prefix multipliers to express each measurement without exponents. b. 55.2×10−10 s
Problem 57a,b,c
Use scientific notation to express each quantity with only base units (no prefix multipliers). a. 4.5 ns b. 18 fs c. 128 pm
Problem 57d
Use scientific notation to express each quantity with only base units (no prefix multipliers). d. 35 μm
Problem 58a,b,c,d
Use scientific notation to express each quantity with only base units (no prefix multipliers). a. 35 mL b. 225 Mm c. 133 Tg d. 1.5 cg
Problem 59a
Complete the table. a. 1245 kg _ 1.245×106 g _ 1.245×109 mg
Problem 59b
Complete the table. b. 515 km _____dm _____cm
Problem 59c
Complete the table. c. 122.355 s _____ms _____ks
Problem 59d
Complete the table. d. 3.345 kJ _____J _____mJ
Problem 60a
Complete the table. a. 355 km/s _____cm/s _____m/ms
Problem 60b,d
Complete the table. b. 1228 g/l _____g/ml _____kg/ml d. 2.554 mg/ml _____g/l _____mg/ml
Problem 60c
Complete the table. c. 554 mK/s _____K/s _____mK/ms
Problem 62
Express the quantity 556.2×10−12 s in each unit. a. ms b. ns c. ps d. fs
Problem 63
How many 1-cm squares would it take to construct a square that is 1 m on each side?
- How many 1-cm cubes does it take to construct a cube that is 4 cm on each edge?
Problem 64
Problem 65
A new penny has a mass of 2.49 g and a volume of 0.349 cm3. Is the penny made of pure copper? Explain your answer.
Problem 66
A titanium bicycle frame displaces 0.314 L of water and has a mass of 1.41 kg. What is the density of the titanium in g/cm3?