Review for 3rd Quarterly Examination - Atomic Structure, Solutions, Kinetics & Equilibrium
Atomic Structure
What is the total charge of the nucleus of a nitrogen atom?
(1) +5
(3) +7
(2) +2
(4) +14
2 What can be determined if only the atomic number of an atom is known?
(1) total number of neutrons in the atom, only
(2) total number of protons in the atom, only
(3) total number of protons and the total number of neutrons in the atom
(4) total number of protons and the total number of electrons in the
atom
3 The wave-mechanical model of the atom is required to explain the
mass number and atomic number of an atom
(1) organization of atoms in a crystal
(2) radioactive nature of some atoms
(3) spectra of elements with multielectron atoms
Which atom in the ground state has a partially filled second electron shell?
(1) hydrogen
(3) lithium
(2) potassium
(4) sodium
4 An atom contains 9 protons, 9 electrons, and 10 neutrons, what is the nuclear charge of this
atom?
(1) 0
(2) +9
(3) +10
(4) +19
Solutions
1.
Why did the man jump into the homogeneous mixture?
(1) to keep his eye on the ions.
(2) to save the solvent
(3) to salute the solute
(4) to be part of the solution.
2.
A solution
(1) is a heterogeneous mixture
(2) can be separated through filtration
(3) does not scatter light
(4) will separate on standing
3.
What is the total mass of solute in 1000. grams of a solution having a concentration of
5 parts per million?
(1) 0.005 g
(3) 0.5 g
(2) 0.05 g
(4) 5 g
4.
Which compound is least soluble in water at 60.°C?
Review for 3rd Quarterly Examination - Atomic Structure, Solutions, Kinetics & Equilibrium
(1) KClO3
(2) KNO3
(3) NaCl
(4)
NH4Cl
5.
Which sample of HCl(aq) contains the greatest number of moles of solute particles?
(1) 1.0 L of 2.0 M HCl (aq)
(3) 3.0 L of 0.50 M HCl (aq)
(2) 2.0 L of 2.0 M HCl (aq)
(4) 4.0 L of 0.50 M HCl
(aq)
6.
Which phrase describes the molarity of a solution?
(1) liters of solute per mole of solution
(2) liters of solution per mole of solution
(3) moles of solute per liter of solution
(4) moles of solution per liter of solution
7.
When 5 grams of KCl are dissolved in 50. grams of water at 25°C, the resulting mixture
can be described as
(1) heterogeneous and unsaturated
(3) homogeneous and
unsaturated
(2) heterogeneous and supersaturated (4) homogeneous and supersaturated
8.
At 50oC, 100 g of water is saturated with NH4Cl. According to Table G, what
mass of NH4Cl must be added to saturate the solution at 70oC?
(1) 0.10 g
(2) 0.20 g
(3) 10. g
(4) 20. g
9.
A thermometer is in a beaker of water. Which statement best explains why the
thermometer reading initially increases when LiBr (s) is dissolved in the water?
(1) The entropy of the LiBr (aq) is greater than the entropy of the water.
(2) The entropy of the LiBr (aq) is less than the entropy of the water.
(3) The dissolving of the LiBr (s) in water is an endothermic process.
(4) The dissolving of the LiBr (s) in water is an exothermic
process.
10.
11.
Which barium salt is insoluble in water?
(1) BaCO3
(2) Ba(ClO4)2
(3) BaCl2
Which unit can be used to express solution concentration?
(1) J/mol
(2) L/mol
(3)
(4) Ba(NO3)2
mol/L
(4) mol/s
12.
How many moles of solute are dissolved in 100 mL of a 2.0 M solution?
(1) 200
(2)
50
(3) 0.20
(4) 0.050
13.
As water is added to a 0.10 M NaCl aqueous solution, the conductivity
(1) decreases because the concentration of ions decreases
(2) decreases, but the concentration of ions remains the same
(3) increases because the concentration of ions decreases
(4) increases, but the concentration of ions remains the same
Review for 3rd Quarterly Examination - Atomic Structure, Solutions, Kinetics & Equilibrium
14.
What is the concentration of O2 (g), in parts per million, in a solution that contains 0.008
gram of O2 (g) dissolved in 1000. grams of H2O(l)?
(1) 0.8 ppm
(2) 8 ppm
(3) 80 ppm
(4) 800
ppm
15.
16.
Which of the following solutions will have the highest freezing point temperature?
(1) 0.8 M NaCl (aq)
(3) 0.8 MgCl2 (aq)
(2) 1.1 M NaCl (aq)
(4) 1.1 M MgCl2 (aq)
Which of the diagrams below correctly shows the orientation of water molecules and ions
in an aqueous solution?
CHOICE 3 negative ion faces + hydrogen, - oxygens face positive ion
17.
Under which conditions of temperature and pressure would a sample of a gas be least
soluble?
(1) At 5oC and 1.0 atm
(2) At 5oC and 2.0 atm
(3) At 10oC and 1.0 atm
Highest Temperature, Lowest Pressure
(4) At 10oC and 2.0 atm
18. Compared to the freezing point and boiling point of water at 1 atmosphere, a solution of
salt and water at 1 atmosphere has a
(1) lower freezing point and a lower boiling point
(2) lower freezing point and a higher boiling point
(3) higher freezing point and a lower boiling point
(4) higher freezing point and a higher boiling point
19. Which of the following solutions is most concentrated? Most solute / Least solvent
(2)
(1) 80.0 grams of solute dissolved in 120. grams of water 80 / 120 = 0.6667
100. grams of solute dissolved in 140. grams of water 100 / 140 = 0.7142
(3) 50. grams of water in 50. grams of water (not a solution)
(4) 25. grams of water in 40. grams of water (not a solution)
Review for 3rd Quarterly Examination - Atomic Structure, Solutions, Kinetics & Equilibrium
Kinetics and Equilibrium
1. The energy needed to start a chemical reaction is called
(1)
(2)
(3)
potential energy
kinetic energy
ionization energy
(4)
activation energy
2. Which statement explains why the speed of some chemical reactions are increased when the surface area of the re
(1)
(2)
(3)
This change increases the density of the reacting particles
This increases the concentration of the reacting particles
This change alters the electrical conductivity of the reacting particles
(4) This exposes more area of the reacting particles to a possible
collision
3. If the pressure on gaseous reactants is decreased the rate of the reaction is decreased because
there is an decrease in
(1)
activation energy
(2)
concentration
(3)
(4)
volume
heat of reaction
4. Given the reaction below:
Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g)
If the concentration of HCl (aq) is increased the frequency of the reacting collisions will
(1)
increase, producing an increase in reaction rate.
(2) decrease, producing an increase in reaction rate.
(3) increase, producing an decrease in reaction rate.
(4) decrease, producing a decrease in reaction rate.
5. From the reactions below which of the following would have the fastest rate of reaction?
(1) CO2 (g) --> C (s) + O2 (g)
(2) Al(s) + O2 (g) → Al2O3(s)
(3) Na+(aq) + Cl- (aq) → NaCl (aq)
(4) 2 H2 (g) + O2 (g) → 2 H2O (l)
Review for 3rd Quarterly Examination - Atomic Structure, Solutions, Kinetics & Equilibrium
5 Which of the following phase changes is exothermic?
(1) boiling
(2) freezing
(3) sublimation
(4) melting
Base your answer to questions 7 - 11 based on the diagram below
1 Which two intervals would be affected by the addition of a catalyst?
(1) 1 and 2
(3) 2 and 3
(2) 3 and 4
(4) 4 and 5
1 Which interval represents the potential energy of the products?
(1) 1
(2) 2 (3) 3
(4) 4
2 ΔH would be represented by which integer?
(1) 1
(2) 2
(3) 3
(4) 4
3 When added which intervals would be equal to the activated complex?
(1) 1 + 5
(3) 2 + 3
(2) 4 + 5
(4) 2 + 5
4 Which statement is true for the graph above?
Review for 3rd Quarterly Examination - Atomic Structure, Solutions, Kinetics & Equilibrium
(1) The reaction is endothermic and the activation energy is highest
for the forward reaction.
(2) The reaction is endothermic and the activation energy is highest for the reverse reaction.
(3) The reaction is exothermic and the activation energy is highest for the forward reaction.
(4) The reaction is exothermic and the activation energy is highest for the reverse reaction.
12 Given the following reaction
3 H2 (g) + N2 (g) --> 2 NH3 (g) + 92 kJ
When 2 moles of NH3 (g) are produced,
92 kJ of heat energy is absorbed
(1)
(2)
(3)
(4)
92 kJ of heat energy is released
184 kJ of heat energy is absorbed
184 kJ of heat energy is released
13 Given the reaction:
A (s) + B (aq) + 30 kJ  AB (aq)
Which statement is correct?
(1)
The reaction is exothermic and the activation energy is higher for the forward reaction as
compared to the activation energy for the reverse reaction.
(2)
The reaction is exothermic and the activation energy is higher for the reverse reaction as
compared to the activation energy for the forward reaction.
(3)
The reaction is endothermic and the activation energy is higher for the forward
reaction as compared to the activation energy for the reverse reaction.
(4)
The reaction is endothermic and the activation energy is higher for the reverse reaction as
compared to the activation energy for the reverse reaction.
14 During sublimation, the disorder of the sample
(1)
(2)
(3)
(4)
increases as energy is released.
increases as energy is absorbed.
decreases as energy is released.
decreases as energy is absorbed.
15 Based on Reference Table I, which change occurs when pellets of solid NaOH are added to
water and stirred?
(1)
(2)
(3)
(4)
The water temperature increases as chemical energy is converted to heat energy.
The water temperature increases as heat energy is stored as chemical energy.
The water temperature decreases as chemical energy is converted to heat energy.
The water temperature decreases as heat energy is stored as chemical energy.
Review for 3rd Quarterly Examination - Atomic Structure, Solutions, Kinetics & Equilibrium
16 Given the reaction at equilibrium:
2SO2(g) + O2(g)
→
2SO3(g) + heat
Which change will shift the equilibrium to the right?
(1)
increasing the temperature
(2)
increasing the pressure
(3)
(4)
decreasing the amount of SO2(g)
decreasing the amount of O2(g)
17 Given the system at equilibrium:
4 HCl(g) + O2(g) → 2 Cl2(g) + 2 H2O (g)
Which change will not shift the point of equilibrium?
(1)
changing the pressure
(2)
adding a catalyst
(3)
(4)
changing concentration of H2O(g)
changing the concentration of Cl2(g)