Unit 13: Acids and Bases
Which of these pH numbers indicates the highest level of acidity?
a) 7 b) 5 c) 10 4) 8
b) 5
An ideal gas is made up of gas particles that
a) have volume c) can be liquified
b) attract each other d) are in random motion
d) are in random motion
1. A small quantity of salt is stirred into a liter of water until it dissolves. The water in the mixture is
a) the solute c) a precipitate
b) dispersed material d) the solvent
d) the solvent
Which equation represents energy being absorbed as a bond is being broken?
a) H + H -> H2 + energy c) H2 -> H + H + energy
b) H + H + energy -> H2 d) H2 + energy -> H + H
d) H2 + energy -> H + H
What is entropy?
measure of disorder/randomness of particles in a substance
Which of the following metals is likely to react with nitric acid to produce hydrogen gas?
a) silver b) gold c) chromium d) copper
c) chromium
According to the kinetic molecular theory, which statement explains why an ideal gas can be compressed to a smaller volume?
a) the motion of the gas particles is circular and orderly
b) the force of attraction between the gas particles is strong
c) as the gas particles collide, the total energy of the system decreases
d) the gas particles are separated by great distances relative to their size
d) the gas particles are separated by great distances relative to their size
2. What happens when copper(II) bromide, CuBr2 is
dissolved in water?
a) Br- ions are attracted to the oxygen atoms of water
b) Br- ions are attracted to the hydrogen atoms of water
c) Cu2+ ions are attracted to the hydrogen atoms of water
d) No attractions are involved, the crystal just falls apart
b) Br- ions are attracted to the hydrogen atoms of water
A substance conducts electricity in the liquid phase but not in the solid phase. This substance can be classified as
a) covalent c) metallic
b) ionic d) molecular
b) ionic
During which phase chance does the entropy of a sample of H2O increase?
a) H2O(g) -> H2O(l) c) H2O(l) -> H2O(g)
b) H2O(g) -> H2O(s) d) H2O(l) -> H2O(s)
c) H2O(l) -> H2O(g)
Which type of reaction occurs when equal molar of an acid and a base are combined?
a) combustion c) single replacement
b) nuetralization d) hydrolysis
At STP, which property would be the same for 1 liter of helium and 1 liter of argon?
a) boiling point c) mass
b) density d) number of atoms
d) number of atoms
According to Reference Table F, which of these compounds is least soluble in water at STP?
a) ZnSO4 c) ZnCO3
b) BaSO4 d) Na2CO3
b) BaSO4 and c) ZnCO3
Which formula represents a compound that is formed primarily by sharing electrons?
a) KCl c) CrCl3
b) CaCl2 d) CCl4
d) CCl4
Which chemical reaction is showing the substances in the reaction going from a state of lower entropy to a state of higher entropy?
a) H2(g) + O2 -> H2O(l) c) H2O(g) + O2 -> H2O(g)
b) C(s) + O2 -> CO2(g) d) C2H2(g) -> 2C(s) + O2(g)
b) C(s) + O2 -> CO2(g)
What substances are produced in reactions between an acid and a base?
a) water and salt b) water and hydrogen gas
c) salt and hydrogen gas d) sugar and salt
a) water and salt
Which of the following gases behaves most like an ideal gas?
a) H2(g) b) O2(g) c) NH3(g) d) CO2(g)
a) H2(g)
As temperature of water increases, the solubility of all gases
a) Decrease, and the solubility of all solids increase
b) Increase, and the solubility of all solids decrease
c) Decrease, and the solubility of all solids also decrease
d) Increase, and the solubility of all solids also increase
a) Decrease, and the solubility of all solids increase
Which substance is correctly paired with its type of bonding?
a) Br2 - polar covalent c) NaBr- nonpolar covalent
b) HCl - no polar covalent d) NH3 - polar covalent
d) NH3 - polar covalent
What is equilibrium?
a state of balance between two opposing processes or reactions
Water solutions conduct electrical current because the solution contains mobile
a) ions b) molecules c) atoms d) electrons
a) ions
At STP, which of the following gases diffuses most rapidly?
a) H2 b) F2 c) Ne d) Xe
a) H2
The solubility of which substance will not be affected by an increase in pressure?
a) Cl2 (g) - chlorine
b) NH3 (g) - ammonia
c) NaNO3 (s) - sodium nitrate
d) CH4 (g) - methane
c) NaNO3 (s) - sodium nitrate
Which statement explains why a C-O bond
is more polar than a F-O bond?
a) At STP, carbon has a greater density than fluorine.
b) A carbon atom has more valence electrons than a fluorine atom.
c) The difference in electronegativity between carbon and oxygen is greater than that between fluorine and oxygen.
d) The difference in first ionization energy between carbon and oxygen is greater than that between fluorine and oxygen.
c) The difference in electronegativity between carbon and oxygen is greater than that between fluorine and oxygen.
As the concentration of the product is decreased in a reversible reaction that has reached equilibrium, the concentration of the reactants will
a) increase c) remain the same
b) decrease d) all of the above
b) decrease