The density of air at room temperature is about 1.2 g/cm3. Estimate the mass of air
inside a 0.80-m3 volume refrigerator. (There are 1 million cm3 in 1 m3.)
A) 0.96 g
B) 960 kg
C) 1000 kg
D) more than 1000 kg
Answer:
How many moles of water are there in 100. grams of water?
A) 1800 moles
B) 100 moles
C) 0.018 moles
D) 5.55 moles
Answer:
Dinosaurs were abundant during the
A) Paleozoic era.
B) Devonian era.
C) Mesozoic era.
D) Cenozoic era.
Answer:
The yeast in bread dough feeds on sugar to produce carbon dioxide. Why does the
dough rise faster in a warmer area?
A) There is a greater number of effective collisions among reacting molecules.
B) Atmospheric pressure decreases with increasing temperature.
C) The yeast tends to “wake up” with warmer temperatures, which is why baker’s yeast
is best stored in the refrigerator.
D) The rate of evaporation increases with increasing temperature.
Answer:
Which solute graphed above has a solubility in water that does not markedly increase
with increasing temperature?
A) NaN
B) LiCl
C) KCl
D) NaCl
Answer:
Regions in which earthquakes are common are also regions in which
A) hurricanes are common.
B) volcanoes are common.
C) the geomagnetic force is strong.
D) many fossils are found.
Answer:
The Mohorovicic discontinuity occurs because of a
A) change in temperature with depth.
B) shift in the density of minerals with the same composition.
C) change in the composition of rocks on both sides of the boundary.
D) density change in rocks of the same composition on both sides of the boundary.
Answer:
A glacier grows and shrinks with the seasons. When a glacier is growing, we say it is
A) retreating.
B) advancing.
C) stationary.
D) crevassing.
Answer:
Which of the following statements about strong and weak bases is not true?
A) A weak base does not completely dissociate in water.
B) A weak base will not react with a strong acid.
C) A strong base can be extremely corrosive.
D) A strong base will readily accept protons from even weak acids.
E) All of the above are untrue.
Answer:
Fresh water enters the ocean by runoff from streams and rivers,
A) precipitation of rain over the ocean, and evaporation of coastal waters.
B) evaporation of surface water, and melting of glacial ice.
C) precipitation, and melting of glacial ice.
D) none of these
Answer:
A sandbag is motionless in outer space. A second sandbag with 3 times the mass
moving at 12 m/s collides with it and they both stick together and move at a speed of
A) 3 m/s.
B) 4 m/s.
C) 6 m/s.
D) 8 m/s.
E) none of the above
Answer:
Chlorine, , is a gas at room temperature, but bromine, , is a liquid. Explain.
A) Chlorine atoms are larger and this makes the formation of induced dipole-induced
dipole attractions more favorable.
B) Bromine atoms are larger and this makes the formation of induced dipole-induced
dipole attractions more favorable.
C) The smaller chlorine molecules are able to pack together in a tighter physical
orientation.
D) The bromine ions are held together by ionic bonds.
Answer:
What does the line in the following example actually represent?
HH
A) a shared pair of electrons
B) a covalent bond
C) an ionic bond
D) a pair of nonbonding electrons
E) A and B
Answer:
If air were a better conductor than it is, nighttimes on Earth would be
A) considerably colder.
B) considerably warmer.
C) not appreciably different in temperature.
Answer:
The magnetic field lines generated by a bar magnet
A) are external only.
B) are both external and internal to the magnet.
C) follow an inverse-square law.
D) none of the above
Answer:
Which of the following best explains what is happening when an atom emits light?
A) An electron is dropping from a higher to a lower energy level with the difference in
energy between the two being emitted as light.
B) A proton is undergoing a nuclear change in the nucleus and is emitting a high energy
light wave in the process.
C) An electron is jumping from a low energy state to a high energy state with the
difference in energy being converted to light.
D) Heat energy is speeding up the orbit of the electrons and the resulting Doppler shift
causes light to be emitted from the electrons.
E) Heat energy is converting a neutron into a proton and an electron, which is ejected
into the orbit of the nucleus, releasing light energy.
Answer:
Reverberation is a phenomenon you would be likely experience while singing in the
A) shower.
B) desert.
C) tundra.
Answer:
Visible light that shines on a pane of transparent glass
A) is mostly reflected.
B) produces a chain of absorptions and re-emissions through the glass.
C) mostly transforms to thermal energy.
Answer:
Ice cubes submerged at the bottom of a liquid mixture indicate that the mixture
A) fails to produce a buoyant force on the ice.
B) has dissolved air in a liquid state.
C) is composed of open-structured crystals.
D) is less dense than ice.
Answer:
An open freight car rolls friction-free along a horizontal track in vertically pouring rain.
As water accumulates in the car, its speed
A) increases.
B) decreases.
C) doesn’t change.
Answer:
In the vacuum of outer space far from our Sun, there is no
A) gravity.
B) atmospheric pressure.
C) both of these
D) none of the above
Answer:
A good cook knows that the temperature of violently boiling water is
A) higher than that of simmering water.
B) the same as that of simmering water.
C) actually lower than 100C.
D) neither of the above
Answer:
According to the following reaction, which molecule is acting as an acid?
OH– + NH4
+ → H2O + NH3
A) H2O
B) NH3
C) OH–
D) NH4
+
E) none of the above
Answer:
Technology is mainly
A) a body of scientific knowledge.
B) a tool of science.
C) what is wrong with the world.
D) a solution to all of mankind’s problems.
Answer:
The final temperature of 1 liter of 40C water poured into 1 liter of 20C water is
A) less than 30C.
B) at or about 30C.
C) more than 30C.
Answer:
Alfred Wegener supported his theory of continental drift by
A) fitting together the shorelines of the African and South American continents.
B) using paleoclimatic dataevidence of glaciers in the Northern Hemisphere.
C) paleomagnetic data.
D) making a connection between rocks, rock structures, and plant and animal fossils
found in both Africa and South America.
Answer:
What is responsible for causing weather on Earth?
A) the presence of the oceans
B) the unequal heating of Earth’s surface
C) carbon dioxide in the atmosphere
D) the jet streams.
Answer:
Radioactivity is a tendency for an element or a material to
A) emit radiation.
B) emit light.
C) emit electrons.
D) glow in the dark.
E) radiate heat.
Answer:
In a gaseous mixture of hydrogen and oxygen, the slower molecules on average are
A) hydrogen.
B) oxygen.
C) both the same
D) not enough information
Answer:
Glaciers will retreat when the amount of accumulation
A) is less than the amount of ablation each year.
B) exceeds the amount of ablation each year.
C) is equal to the amount of ablation.
Answer:
Compared to a recoiling rifle, the bullet that is fired has a greater
A) momentum.
B) kinetic energy.
C) none of the above
Answer:
Why is Mars’ greenhouse effect negligible compared to that of Earth’s?
A) Its mass is only one-ninth of Earth’s.
B) Greenhouse gas emissions were greatly curtailed according to the International Mars
Greenhouse Gas Reduction Treaty of 2003.
C) The Martian atmosphere is much thinner and retains little heat.
D) Martian carbon dioxide contains a rare isotope with little ability to trap heat.
Answer:
Which of the following species is undergoing reduction?
2 CuBr → 2Cu + Br2
A) Cu
B) CuBr
C) Cu+
D) Br–
E) Br2
Answer:
If an object falls with constant acceleration, the velocity of the object must
A) be constant also.
B) continually change by the same amount each second.
C) continually change by varying amounts, depending on its speed.
D) continually decrease.
E) none of the above
Answer:
Which is more dangerous, touching a faulty 120-V light fixture, or a Van de Graaff
generator charged to 100,000 V?
A) light fixture
B) generator
C) both equally
Answer: