Test Bank for Chemistry, 6th Edition,
Thomas R Gilbert, Rein V Kirss
,1. Which step is a part of the scientific method?
a. form a testable hypothesis
b. prove the hypothesis right or wrong
c. generalize results to various situations
d. consider results as determined by a single variable
e. stop experimentation once the desired results are achieved
2. For a hypothesis to be considered a valid scientific theory, it must
a. summarize experimental data without trying to predict future results.
b. be impossible to prove wrong by experiment.
c. explain widely observed phenomena based on extensive testing.
d. never be modified or expanded.
e. be voted on by the scientific community and accepted by all.
3. Which of the following definitions applies to a scientific law?
a. a prediction about the results of future scientific investigations
b. a concise description of a fundamental scientific truth
c. an explanation of repeated observations about nature
d. an educated guess about a fundamental scientific truth
e. a historically accepted fact
,4. Which of the following is a hypothesis?
a. Energy is required to vaporize a liquid.
b. The composition of a pure substance is fixed and definite.
c. Hydrogen gas and oxygen gas can react to form water.
d. If the car won’t start, its battery must be dead
e. matter cannot be created or destroyed
5. According to the law of definite proportions,
a. atoms forming a given compound react in variable proportions depending on
conditions.
b. different samples of the same compound contain the same proportions of the
same elements.
c. all compounds containing the same types of atoms have identical properties.
d. all compounds containing the same types of atoms have relative masses that
are whole-number multiples.
e. only one type of molecule can be produced when two elements combine.
6. The law of definite proportions states that
a. compounds such as NO and NO2 have identical chemical properties.
b. compounds such as NO and NO2 must have masses that are whole-number
multiples of each other.
c. nitrogen and oxygen can combine to form a variety of compounds, such as NO
or NO2.
, d. the elements forming a given compound always react in the same proportions.
e. only one compound can be produced when two elements combine.
7. Which of the following illustrates the law of multiple proportions?
a. The mass ratio of O to N in NO2 is twice that in NO.
b. NO2 always contains one nitrogen atom and two oxygen atoms.
c. The mass of NO2 is a small whole-number multiple of the mass of NO.
d. NO and NO2 have similar chemical and physical properties.
e. NO always contains one nitrogen and one oxygen atom.
8. Do a large sample and a small sample of a given compound contain the same number of
each type of atom? Why?
a. Yes, the numbers of each type of atom in a given compound do not vary.
b. No, the constituent elements of one sample of a compound are different than
in another sample of a compound
c. Yes, all samples of a given compound are identical
d. No, because a compound has atoms in identical proportions, not atoms in
identical numbers.
e. No, because a large sample and a small sample of a compound have different
chemical formulas.
9. Given that the chemical formula of methanol is CH4O, what do you know about the
relative numbers of its constituent atoms?
Thomas R Gilbert, Rein V Kirss
,1. Which step is a part of the scientific method?
a. form a testable hypothesis
b. prove the hypothesis right or wrong
c. generalize results to various situations
d. consider results as determined by a single variable
e. stop experimentation once the desired results are achieved
2. For a hypothesis to be considered a valid scientific theory, it must
a. summarize experimental data without trying to predict future results.
b. be impossible to prove wrong by experiment.
c. explain widely observed phenomena based on extensive testing.
d. never be modified or expanded.
e. be voted on by the scientific community and accepted by all.
3. Which of the following definitions applies to a scientific law?
a. a prediction about the results of future scientific investigations
b. a concise description of a fundamental scientific truth
c. an explanation of repeated observations about nature
d. an educated guess about a fundamental scientific truth
e. a historically accepted fact
,4. Which of the following is a hypothesis?
a. Energy is required to vaporize a liquid.
b. The composition of a pure substance is fixed and definite.
c. Hydrogen gas and oxygen gas can react to form water.
d. If the car won’t start, its battery must be dead
e. matter cannot be created or destroyed
5. According to the law of definite proportions,
a. atoms forming a given compound react in variable proportions depending on
conditions.
b. different samples of the same compound contain the same proportions of the
same elements.
c. all compounds containing the same types of atoms have identical properties.
d. all compounds containing the same types of atoms have relative masses that
are whole-number multiples.
e. only one type of molecule can be produced when two elements combine.
6. The law of definite proportions states that
a. compounds such as NO and NO2 have identical chemical properties.
b. compounds such as NO and NO2 must have masses that are whole-number
multiples of each other.
c. nitrogen and oxygen can combine to form a variety of compounds, such as NO
or NO2.
, d. the elements forming a given compound always react in the same proportions.
e. only one compound can be produced when two elements combine.
7. Which of the following illustrates the law of multiple proportions?
a. The mass ratio of O to N in NO2 is twice that in NO.
b. NO2 always contains one nitrogen atom and two oxygen atoms.
c. The mass of NO2 is a small whole-number multiple of the mass of NO.
d. NO and NO2 have similar chemical and physical properties.
e. NO always contains one nitrogen and one oxygen atom.
8. Do a large sample and a small sample of a given compound contain the same number of
each type of atom? Why?
a. Yes, the numbers of each type of atom in a given compound do not vary.
b. No, the constituent elements of one sample of a compound are different than
in another sample of a compound
c. Yes, all samples of a given compound are identical
d. No, because a compound has atoms in identical proportions, not atoms in
identical numbers.
e. No, because a large sample and a small sample of a compound have different
chemical formulas.
9. Given that the chemical formula of methanol is CH4O, what do you know about the
relative numbers of its constituent atoms?
