1. butane has a chemical formula ch4h10. the equation 2c4h10 + 13o2 → 8co2 + 10h2o represents which of these?
a) a physical change of butane into other substances.
b) a chemical change of butane into other substances.
c) a physical change of other substances into butane.
d) a chemical change of other substances into butane.
2. an atom is analyzed in terms of its energy levels.
when a hydrogen atom absorbs a photon, and an electron moves from energy level 1 to level 2, what happens to the energy of the atom?
a) it increases.
b) it decreases.
c) it remains the same.
d) it increases and then decreases.
3. the initial pressure exerted on 1.0 liter of gas is 100 kpa. the pressure is changed and the new volume of gas is 0.25 liters. the pressure is changed to
a) 25 kpa.
b) 200 kpa.
c) 400 kpa.
d) 4000 kpa.
4.all but one of these compounds is a base. that is
a) nh3.
b) naoh.
c) hclo4.
d) nh4oh.
5.
consider the reaction mechanism,
a + o3(g) → b + o2(g)
c + o(g) → d + o2(g)
if a catalyst were used in the reaction mechanism, where would it likely appear?
a) a and b
b) c and d
c) b and c
d) a and d
6. the melting and boiling points of the hydrides of the elements of a group increase with increasing molecular weight. then why is hydrogen sulfide (h2s) a gas, but water (h2o) is a liquid?
a) h2s is acidic in nature
b) h2s has higher molecular weight
c) h2s has stronger intermolecular force of attraction
d) h2o has stronger intermolecular force of attraction
Answers: 1
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