3rd Q Review 6 Question Preview (ID: 61409)
3 Rd Q Review.
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Which statement describes a concept included in the wave-mechanical model of the atom?
a) A) Protons, neutrons, and electrons are located in the nucleus
b) B) Electrons orbit the nucleus in shells at fixed distances.
c) C) Atoms are hard, indivisible spheres.
d) D) Electrons are located in regions called orbitals.
Two atoms that are different isotopes of the same element have
a) A) the same number of protons and the same number of neutrons
b) B) the same number of protons but a different number of neutrons
c) C) a different number of protons but the same number of neutrons
d) D) a different number of protons and a different number of neutrons
Which term identifies a type of intermolecular force?
a) ionic bonding
b) hydrogen bonding
c) metallic bonding
d) covalent bonding
Entropy is a measure of
a) accuracy
b) the disorder of a system
c) the attraction of a nucleus for an electron
d) heat
Systems in nature tend to undergo changes toward
a) lower energy and less randomness
b) higher energy and less randomness
c) lower energy and greater randomness
d) higher energy and greater randomness
In a neutralization reaction, an aqueous solution of an acid reacts with an aqueous solution of an base to produce
a) a salt and water
b) a salt and an alcohol
c) another base
d) another acid
Which radioactive emission has the greatest penetrating power?
a) positron
b) gamma ray
c) alpha particle
d) beta particle
Which terms identify two different categories of compounds?
a) covalent and molecular
b) covalent and empirical
c) ionic and molecular
d) ionic and empirical
Which statement describes the EARLIST model of the atom?
a) An atom is an indivisible hard sphere.
b) An atom has a small, dense nucleus.
c) Electrons are negative particles in an atom.
d) Electrons in an atom have wave-like properties.
Which element is classified as a metalloid?
a) boron
b) potassium
c) sulfur
d) xenon
Strontium and barium have similar chemical properties because atoms of these elements have the same number of
a) protons
b) neutrons
c) electron shells
d) valence electrons
Distillation is a process used to separate a mixture of liquids based on different
a) densities
b) solubilities
c) boiling points
d) freezing points
The arrangement of the elements from left to right in Period 4 on the Periodic Table is based on
a) atomic mass
b) atomic number
c) the number of electron shells
d) the number of oxidation states
Which property can be defined as the ability of a substance to be hammered into thin sheets?
a) conductivity
b) malleability
c) solubility
d) melting point
Which expression could represent the concentration of a solution?
a) 3.5 g
b) 3.5 M
c) 3.5 mL
d) 3.5 mol
Which form of energy is associated with the random motion of the particles in a sample of water?
a) chemical energy
b) electrical energy
c) nuclear energy
d) thermal energy
Which changes can reach dynamic equilibrium?
a) nuclear changes, only
b) chemical changes, only
c) nuclear and physical changes
d) chemical and physical changes
What occurs when a reaction reaches equilibrium?
a) The concentration of the reactants increases.
b) The concentration of the products increase
c) The rate of the forward reaction is equal to the rate of the reverse reaction,
d) The rate of the forward reaction is slower than the rate of the reverse reaction.
When the hydronium ion concentration of an aqueous solution is increased by a factor of 10, the pH value of the solution
a) decreases by 1
b) increases by 1
c) increases by 10
d) decreases by 10
What occurs when potassium reacts with chlorine to form potassium chloride?
a) Electrons are shared and the bonding is ionic.
b) Electrons are shared and the bonding is covalent.
c) Electrons are transferred and the bonding is ionic.
d) Electrons are transferred and the bonding is covalent.
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