Chemical Reactions
What is the category of the following chemical reaction? Zn+2HCl→H2+ZnCl2
Single Displacement
What is the net ionic equation of the following chemical reaction?
AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)
Ag++(aq)+Cl-(aq)→AgCl(s)
Which postulate does not describe the behavior of an ideal gas?
a) Particles in constant motion
b) Negligible molecular volume
c) Negligible attractive forces negligible
d) Collisions are inelastic
e) The motion of the particles occurs in straight paths
Collisions are inelastic
Which of the following is an example of a situation where kinetic energy is developed?
a) A falling rock
b) A stretched spring
c) A charged capacitor
d) A photon from a laser
e) A glowing light bulb
A
What is the molecular weight of the following hydrate?
CuSO4⋅5H2O
249.72 g/mol
Which of the following species undergoes reduction?\
KClO3→KCl+3/2 O2
Chlorine
9) Which of the following are examples of homogeneous mixtures (solutions)?
a) Air (oxygen + nitrogen)
b) Ice cream
c) A sugar solution in water
d) a and b
e) a and c
e) a & c
Which of the following is a/are general property(ies) of gasses?
a) Not easily compressible
b) Fast molecular motion
c) No defined shape (based on the container)
d) a and b
e) b and c
E) b and c
The following term describes the total energy of all particles in a substance.
a) Thermal energy
b) Temperature
c) Potential energy
d) Internal energy
e) Kinetic energy
D
Which chemical characteristic is responsible for the fantastic properties of water on Earth’s conditions?
a)Freezing Point
b)Non-polar O-H bonds
c) Hydrogen Bonding
d)Boiling Point
e)Van der Waals constants
c) Hydrogen Bonding
Which sequence of numbers balances the following reaction? _Al2O3+_HCl→_AlCl3+_H2O
1,6,2,3
What is the category of the following species that dissolves in water?
NH3(aq)+H2O(l)↔NH4+(aq)+OH-(aq)
a) weak electrolyte
b) non-electrolyte
c) strong electrolyte
d) non-polar molecule
e) heterogeneous mixture
weak electrolyte
All of the following are characteristics of real gasses except…
a) Inelastic collisions
b) Significant molecular volume
c) Significant attractive forces
d) Elastic Collisions
e) Large spacing between molecules
d) Elastic Collisions
In a thermodynamic study, this term is used to describe everything outside the system.
a) System
b) Surroundings
c) Universe
d) Boundary
e) Exothermic body
B
A mixture of two gasses has a pressure of 8.0 atm. If the mole fraction of one gas is 0.60, what is the partial pressure of the other gas?
3.2 atm
You obtain A = 6.354 g, 2B = 31.700g from the reaction
“A + 2B----> 6C”. What Is the mass of 6C?
38.054 g
What is the molarity (M) of a solution prepared by dissolving 20.0 g of NaCl in 250.0 mL of water?
0.03 M
What is the volume of 12.5 moles of a gas at STP conditions?
278.4 L
10.0 g of H2O at 60°C are needed to bring 3.0 g of a substance at 5°C to a temperature of 25°C. What is its specific heat (Cs)?
24.38 J/g*C
Using Hess’s law, what is the ΔHrxn for the reaction Z → 3Y, given that X + Y → Z, ΔHrxn = -40.0 kJ/mol, and Y → 2Z, ΔHrxn = +60.0 kJ/mol?
-20 kJ
40.0 g of Na reacts completely. How many grams of NaOH are produced?
2 Na + 2 H2O ----> 2 NaOH + H2
69.99 g NaOH
You wish to prepare 150.0 mL of a 0.2% m/m solution of NaCl. How many mL of a stock solution of 4.0% m/m NaCl do you need?
7.5 mL
At constant volume, a gas at 30°C is pressurized to 5.0 atm and heated to 100°C. What is the initial pressure of the gas?
4.5 atm
23) What is the ΔHrxn for the following reaction?
C(s) + O2(g) → CO2(g)
ΔH°C = 0.0 kJ/mol ; ΔH°O2 = 0.0 kJ/mol ; ΔH°CO2 = -393.5 kJ/mol
-393.5 kJ
When the crest of wave A overlaps with the crest of wave B, this occurs (Consider wave A and B to be identical):
a) Constructive interference
b) Destructive interference
c) Amplified interference
d) Disrupted interference
e) No interference
Constructive interference