Atoms
Which statement concerning the structure of the atom is correct?
a.) Protons and neutrons have most of the mass and occupy most of the volume of the atom.
b.) Electrons have most of the mass and occupy most of the volume of the atom.
c.) Electrons have most of the mass but occupy very little of the volume of the atom.
d.) Protons and neutrons have most of the mass but occupy very little of the volume of the atom.
d.) Protons and neutrons have most of the mass but occupy very little of the volume of the atom.
Resonance structures describe molecules that have
a.) hybrid orbitals
b.) rapid equilibria
c.) resonating electrons
d.) multiple electron-dot formulas
d.) multiple electron-dot formulas
What volume of 12 M HCl solution is required to prepare exactly 500 mL of a 0.60 M HCl solution?
a.) 10 mL
b.) 14 mL
c.) 25 mL
d.) 40 mL
c.) 25 mL
For which of these processes is the change of entropy expected to be negative?
I. Sugar is dissolved in water.
II. Steam is condensed
III. CaCO3 is decomposed into CaO and CO2
a.) I only
b.) I and III only
c.) II only
d.) II and III only
c.) II only
A particular solid is soft, a poor conductor of heat and electricity, and has a low melting point. Generally, such a solid is classified as
a.) ionic
b.) molecular
c.) metallic
d.) network covalent
b.) molecular
An atom of the element of atomic number 84 and mass number 199 emits an alpha particle. The residual atom after this change has an atomic number of _______ and a mass number of ________.
a.) 82, 195
b.) 84, 203
c.) 85, 195
d.) 86, 199
a.) 82, 195
A compound consisting of an element having a low ionization energy and a second element having a high electron affinity is likely to have
a.) covalent bonds
b.) metallic bonds
c.) coordinate covalent bonds
d.) ionic bonds
d.) ionic bonds
What is the solubility product, Ksp, of Mg(OH)2 if its solubility in water in 1.6 x 10-4 mol/L?
a.) 1.6 x 10-11
b.) 2.6 x 10-8
c.) 3.2 x 10-4
d.) 4.1 x 10-12
a.) 1.6 x 10-11
DAILY DOUBLE!!!!!!!!!!!!!!!!!!!
Which of the following are true about the process of water making the transition from the liquid to the gaseous state at 310oC?
a. ∆G>0, ∆H<0, and ∆S=0
b. ∆G<0, ∆H>0, and ∆S<0
c. ∆G>0, ∆H>0, and ∆S>0
d. ∆G<0, ∆H<0, and ∆S>0
e. ∆G<0, ∆H>0, and ∆S>0
e. ∆G<0, ∆H>0, and ∆S>0
All of these changes increase the value of the rate constant for a reaction except
a.) decreasing the activation energy
b.) raising the temperature
c.) adding a catalyst
d.) increasing the concentration of reactants
d.) increasing the concentration of reactants
Avogadro's number equals the number of
a.) atoms in one mole of atoms
b.) molecules in one mole of O2
c.) marbles in one mole of marbles
d.) all of the above
d.) all of the above
How many valence electrons are represented in the Lewis electron-dot structure for SO2?
a.) 6
b.) 8
c.) 18
d.) 32
c.) 18
The number of atoms in 9.0 g of aluminum is the same as the number of atoms in
a.) 8.1 g of magnesium
b.) 9.0 g of magnesium
c.) 12.1 g of magnesium
d.) 18.0 g of magnesium
a.) 8.1 g of magnesium
When a material in the liquid state is vaporized and then condensed to a liquid, the steps in the process are, respectively,
a.) exothermic and exothermic
b.) exothermic and endothermic
c.) endothermic and exothermic
d.) endothermic and endothermic
c.) endothermic and exothermic
Which gas is most soluble in water?
a.) ammonia, NH3
b.) hydrogen, H2
c.) methane, CH4
d.) nitrogen, N2
a.) ammonia, NH3
What significant information about atomic structure came from the Millikan experiment using charged oil drops?
a.) Millikan shows that cathode rays were identical to a stream of electrons coming from an atom.
b.) Millikan confirmed that the neutron and proton were of about the same mass.
c.) Millikan determine the magnitude of the charge of an electron.
d.) Millikan proved that the mass of an atom was concentrated in the nucleus.
c.) Millikan determine the magnitude of the charge of an electron.
Which species have both covalent and ionic bonds?
a.) NH3BF3
b.) H3O+
c.) NaKS
d.) Mg(CN)2
d.) Mg(CN)2
Calculate the mass of SbF3(MM = 179 g/mol) needed to produce 1.00 g of CCl2F2(MM = 121 g/mol). The reaction is represented by the following equation.
3CCl4 + 2SBF3 --> 3CCl2F2 + 2SbCl3
a.) 0.667g
b.) 0.986g
c.) 1.48g
d.) 2.22 g
b.) 0.986g
A particular chemical reaction has a negative delta H and a negative delta S. Which statement is correct?
a.) the reaction is spontaneous at all temperatures
b.) the reaction is non-spontaneous at all temperatures
c.) the reaction becomes spontaneous as temperature increases
d.) the reaction becomes spontaneous as temperature decreases
d.) the reaction becomes spontaneous as temperature decreases
A plot of reactant concentration as a function of time gives a straight line. What is the order of the reaction for this reactant?
a.) zero
b.) first
c.) second
d.) third
a.) zero
A typical silicon chip, such as those in electronic calculators, has a mass of 2.3x10-4 g. Assuming the chip is pure silicon, how many silicon atoms are in such a chip?
a.) 4.9 x 1018
b.) 1.4 x 1020
c.) 3.9 x 1021
d.) 2.6 x 1027
a.) 4.9 x 1018
Knowing that F is more electronegative than either B or P, what conclusion can be drawn from the fact that BF3 has no dipole moment, but PF3 does?
a.) BF3 is not spherically symmetrical, but PF3 is.
b.) The BF3 molecule must be trigonal planar.
c.) The BF3 molecule must be linear.
d.) The atomic radius of P is larger than the atomic radius of B.
b.) The BF3 molecule must be trigonal planar.
In a 0.050 M solution of a weak monoprotic acid, [H+] = 1.8 x 10-3. What is its Ka?
a.) 3.6 x 10-2
b.) 9.0 x 10-5
c.) 6.7 x 10-5
d.) 1.6 x 10-7
c.) 6.7 x 10-5
What will be the effect of increasing the temperature of reactants that are known to undergo an endothermic reaction?
a.) Both the rate of reaction and the value of the equilibrium constant increase.
b.) The rate of reaction increases and the value of the equilibrium constant decreases.
c.) The rate of reaction decreases and the value of the equilibrium constant increases.
d.) The rate of reaction increases and the value of the equilibrium constant is unchanged.
a.) Both the rate of reaction and the value of the equilibrium constant increase.
When the three elements S, Se, and Cl are arranged in order of increasing atomic radius, which is the correct order?
a.) Se < S < Cl
b.) S < Cl < Se
c.) Cl < S < Se
d.) S < Se < Cl
c.) Cl < S < Se