Chemistry Chapter 4
C. 8.74%
Calculate the mass percent of carbon in CCl3F(Freon-11) a. 77.5% b. 25.8% c. 8.74% d. 13.8%
C. 175
How many sulfur atoms would it take to obtain a mass of 9.31 x 10^-21 of S? a. 15 b. 75 c. 175 d. 500
D. 6.18 x 10^24 g
Liquid propane (C3H8) is the fuel used in gas grills as well as the main source of heat energy for many rural residences. How many molecules are found in 16 ounces of propane with mass of 453 g? a. 6.57 x 10^19 g b. 6.41 x 10^-18 g c. 3.32 x 10^-20 g d. 6.18 x 10^24 g
A. 2.54 g
Although coal is a complex mixture of substances, its elemental composition can be approximated by the formula C126 H96 O9 NS. How much carbon dioxide (in grams) could be generated from 25.0 g of coal as the primary source of carbon. C(S) + 2(g)--CO2(g) a. 2.54 g b. 3.74 g c. 12.68 g d. 125.0 g
B. Colder
Although greenhouse gases likely account for the problem of global warming, they are also responsible for making Earth habitable. Would the temperature of the Earth be warmer or colder on average if CO2 were not present in our atmosphere? a. Warmer b. Colder c. No change in temperature is expected
B. 5.00 x 10^8 t-0.09(5.00 x 10^8 t)
CO2 emissions in China declined by 9% over the five-year period ending in 2000. If 5.00 x 10^8 metric tons (t) of CO2 was emitted in 1995, how would you calculate how much CO2 was released in 2000? a. 0.09 (5.00 x 10^8 t) b. 5.00 x 10^8 t-0.09(5.00 x 10^8 t) c. 5.00 x 10^8 t + 0.09(5.00 x 10^8 t) d. 0.09 x 5 years x 5.00 x 10^8 t/year
C. CaCO3
Calcium carbonate is known as chalk and also found in the rock portion of the carbon cycle. What is its formula? a. CaCO b. CaCO2 c. CaCO3 d. Ca(HCO3)2
A. 2.94 x 10^-18 g
Calculate the mass of 2.50 x 10^4 molecules of chlorine gas. a. 2.94 x 10^-18 g b. 1.07 x 10^30 g c. 1.77 x 10^6 g d. 5.28 x 10^26 g
D. Trigonal planar
Determine the molecular shape or geometry of CO3^-2. a. tetrahedral b. trigonal pyramidal c. bent d. trigonal planar
C. 60.11 g/mol
Find the molar mass of propanol C3 H8 O a. 69.2 g/mol b. 65.06 g/mol c. 60.11 g/mol d. 69.0 g/mol
A. 2.86 x 10^23
Hydrogen gas (H2) is a promising alternative to fossil fuels. How many molecules are present in 100.0 L of hydrogen gas with density of 0.0899 g/L? a. 2.86 x 10^23 b. 5.36 x 10^24 c. 3.0 x 10^26 d. 6.0 x 10^26
A. True
O-O-O bond angle is an ozone (O3) molecule is likely to be less than 120 degrees due to the unbonded pair of electrons on the central oxygen atom. a. True b. False
B. False
On average, cloudy nights are warmer than clear nights because clouds reflect light from the moon. a. True b. False
B
The carbon cycle refers to the mechanism by which carbon dioxide causes global warning. a. True b. False
B. False
The most abundant greenhouse gas in Earth's atmosphere is CO2. a. True b. False
B. False
The weighted average mass of carbon is found by adding the mass of its 3 existing isotopes: C-12, C-13, and C-14 together and dividing by 3. a. True b. False
A. Fossil Fuels
What is the greatest source of carbon in the carbon reservoirs? a. Fossil Fuels b. Sand and silt c. soils d. Deep ocean
B. 180.16 g/mol
What is the molar mass of fructose C6H12O6? a. 179.3 g/mol b. 180.16 g/mol c. 195.3 g/mol d. 197.1 g/mol
C. to the ocean
Where do you notice the greatest movement of carbon through the system? a. Through respiration b. through photosynthesis c. to the ocean
C. It is the natural process in which atmospheric gases trap more than 80% of the heat energy radiated by Earth.
Which definition best explains enhanced greenhouse effect? a. It is the natural process by which the atmospheric gases trap a major portion b. It is the natural effect of the sun warming the earth by the oceans absorbing UV light and warming the ground by heat transfer. c. It is the natural process in which atmospheric gases trap more than 80% of the heat energy radiated by Earth. d. It is the increasing of the the average global temperature by humans.
