1 What is the approximate mass of a proton?
(1) 1 u (3) 1 g
(2) 0.0005 u (4) 0.0005 g
2 An electron in a sodium atom gains enough
energy to move from the second shell to the
third shell. The sodium atom becomes
(1) a positive ion
(2) a negative ion
(3) an atom in an excited state
(4) an atom in the ground state
3 Which particle has no charge?
(1) electron (3) positron
(2) neutron (4) proton
4 Which quantity represents the number of
protons in an atom?
(1) atomic number
(2) oxidation number
(3) number of neutrons
(4) number of valence electrons
5 The element sulfur is classified as a
(1) metal (3) nonmetal
(2) metalloid (4) noble gas
6 The elements in Group 2 have similar chemical
properties because each atom of these elements
has the same
(1) atomic number
(2) mass number
(3) number of electron shells
(4) number of valence electrons
7 What is formed when two atoms of bromine
(1) a monatomic molecule
(2) a diatomic molecule
(3) a heterogeneous mixture
(4) a homogeneous mixture
8 Gold can be flattened into an extremely thin
sheet. The malleability of gold is due to the
(1) radioactive decay mode of the isotope Au-198
(2) proton-to-neutron ratio in an atom of gold
(3) nature of the bonds between gold atoms
(4) reactivity of gold atoms
9 Which term represents the attraction one atom
has for the electrons in a bond with another atom?
(2) electrical conductivity
(3) first ionization energy
(4) mechanical energy
10 Salt water is classified as a
(1) compound because the proportion of its
atoms is fixed
(2) compound because the proportion of its
atoms can vary
(3) mixture because the proportion of its
components is fixed
(4) mixture because the proportion of its
components can vary
11 Which substance can not be broken down by a
(1) ammonia (3) ethane
(2) arsenic (4) propanal
12 Some physical properties of two samples of iodine-127
at two different temperatures are shown in the table below.
Selected Physical Properties of Iodine-127 Samples at 1 atm
Sample Sample Temperature(K) Description Density(g/cm 3)
1 298 dark-gray crystals 4.933
2 525 dark-purple gas 0.006
These two samples are two different
(1) mixtures (3) phases of matter
(2) substances (4) isotopes of iodine
13 Powdered iron is magnetic, but powdered sulfur
is not. What occurs when they form a mixture in a
beaker at room temperature?
(1) The iron retains its magnetic properties.
(2) The iron loses its metallic properties.
(3) The sulfur gains magnetic properties.
(4) The sulfur gains metallic properties.
14 Which property is a measure of the average
kinetic energy of the particles in a sample of
(1) mass (3) pressure
(2) density (4) temperature
15 According to the kinetic molecular theory,
which statement describes the particles of an
(1) The gas particles are arranged in a regular
(2) The force of attraction between the gas
particles is strong.
(3) The gas particles are hard spheres in
continuous circular motion.
(4) The collisions of the gas particles may result
in the transfer of energy.
16 The concentration of a solution can be
(1) milliliters per minute
(2) parts per million
(3) grams per kelvin
(4) joules per gram
17 Two hydrogen atoms form a hydrogen molecule
(1) one atom loses a valence electron to the other
(2) one atom shares four electrons with the other
(3) the two atoms collide and both atoms gain
(4) the two atoms collide with sufficient energy
to form a bond
18 Which type of formula represents the simplest
whole-number ratio of atoms of the elements in
(1) molecular formula (3) empirical formula
(2) condensed formula (4) structural formula
19 The coefficients in a balanced chemical equation
(1) the mass ratios of the substances in the
(2) the mole ratios of the substances in the
(3) the total number of electrons in the reaction
(4) the total number of elements in the reaction
20 Systems in nature tend to undergo changes
(1) lower energy and higher entropy
(2) lower energy and lower entropy
(3) higher energy and higher entropy
(4) higher energy and lower entropy
21 Which formula represents an organic compound?
(1) CaH 2 (3) H 2O 2
(2) C 4H 8 (4) P 2O 5
22 Which class of organic compounds contains
(1) aldehyde (3) amine
(2) alcohol (4) ether
23 Which term identifies a type of organic reaction?
(1) deposition (3) esterification
(2) distillation (4) sublimation
24 Which compound is classified as a hydrocarbon?
(1) butanal (3) 2-butanol
(2) butyne (4) 2-butanone
25 In an oxidation-reduction reaction, the number
of electrons lost is
(1) equal to the number of electrons gained
(2) equal to the number of protons gained
(3) less than the number of electrons gained
(4) less than the number of protons gained
26 Which substance is an electrolyte?
(1) C 6H 12O 6(s) (3) NaOH(s)
(2) C 2H 5OH(ℓ) (4) H 2(g)
27 Which energy conversion must occur in an
operating electrolytic cell?
(1) electrical energy to chemical energy
(2) electrical energy to nuclear energy
(3) chemical energy to electrical energy
(4) chemical energy to nuclear energy
28 Which compound yields H + ions as the only
positive ions in an aqueous solution?
(1) KOH (3) CH 3OH
(2) NaOH (4) CH 3COOH
29 Which statement describes the relative masses
of two different particles?
(1) A neutron has less mass than a positron.
(2) A beta particle has less mass than a neutron.
(3) An alpha particle has less mass than a
(4) An alpha particle has less mass than a beta
30 Which term represents a type of nuclear reaction?
(3) single replacement
(4) natural transmutation