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Test your basic knowledge |
CLEP Chemistry 1
Start Test
Study First
Subjects
:
clep
,
science
,
chemistry
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. For a cell at concentrations and conditions other than standard - a potential can be calculated using this equation.
Nernst equation
positive charge
kinetic molecular theory
left - right (Le Chatelier's principle)
2. The amount of heat energy required to raise the temperature of a given quantity of a substance one degree celcius.
increases
heat capacity
electrolytic cells
boiling point elevation
3. The heat required to change 1mole of solid completely to vapor.
...
second law of thermodynamics
molar heat of sublimation
point particles
4. The change in enthalpy of an exothermic reaction is ________.
positive
negative
equation of state
activation energy
5. Decreasing the concentrations of reactants shifts the equilibrium to the ______ - thus decreasing the concentration of products formed.
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6. In titration - this is the point at which a particular indicator changes color.
isopiestic process (thermodynamics)
entropy
kinetic molecular theory
end point
7. The _____ speed up the rate of a chemical reaction but do not change the equilibrium constant - it simply speeds up the rate of approach to equilibrium.
2
bohr model
single replacement/displacement
catalysts
8. A chemical reaction where one substance is displacing another. ex: Fe + CuSo4 -> FeSo4 + Cu.
third law of thermodynamics
titration
kinetic molecular theory
single replacement/displacement
9. A catalyst lowers the ______ _____ _____ that must be overcome in order for the reaction to proceed. It merely speeds the approach to equilibrium but does not change Keq at all.
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10. Increasing the pressure on a system at equilibrium will cause a shift in the position of equilibrium in the direction of the fewest number of ______ of gaseous reactants or products.
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11. **Proceeding across a period from left to right - the ionization energy _______.
activation energy barrier (Le Chatelier's principle)
crystallizes
increases
...
12. Rays made up of positive electrodes in basic electron charges.
dynamic equilibrium
anode rays
hydrolysis
Le Chatelier's principle
13. The law stating that in any spontaneous process there is an increase in the entropy of the universe.
moles (Le Chatelier's principle)
2
Valence Shell Electron Pair Repulsion (VSEPR)
second law of thermodynamics
14. The process of determining the amount of a solution of known concentration that is required to react completely with a certain amount of a sample that is being analyzed.
Daltons law
kinetic molecular theory
titration
reversible reaction
15. For a ________ reaction - the energy liberated in the exothermic reaction equals the energy absorbed in the endothermic reaction.
kinetic molecular theory
reversible reaction
freezing point depression
crystallizes
16. If an inert gas is introduced into a reaction vessel containing other gases at equilibrium - it will cause an increase in the ______ _____ within the container - but the increase will not affect the position of equilibrium.
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17. *Each wave function corresponds to a certain electron energy and describes a region about the nucleus (orbital) where an electron having that energy may be found.
phase equilibrium
emits (in atomic spectra)
wave mechanical model
...
18. When solids are heated at certain perssures - some solids vaporize directly without passing through the liquid phase.
boiling point
positive charge
Charles law
sublimation
19. Metals have electronegativities less than ____
lower left corner
ionization energy
2
Charles law
20. *The hypothetical ideal gas obeys exactly the mathematical statement of the ideal gas law. This statement is also called the _____ ___ ____ of an ideal gas because it relates the variables (P - V - n - T) that specify properties of the gas.
equation of state
Charles law
electromotive force (emf)/ cell
combination
21. For a solution in which a nonvolatile solute is dissolved in a solvent - the vapor pressure is due only to the vapor of the solvent above the solution. This vapor pressure is given by _______ law.
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22. Reactions that do not occur spontaneously can be forced to take place by supplying energy with an external current.
Daltons law
boiling point elevation
electrolytic reactions
positive
23. Cells that convert electrical energy into chemical energy.
freezing point depression
activation energy barrier (Le Chatelier's principle)
electrolytic cells
Charles law
24. The average kinetic energy of all the molecules collectively is directly proportional to the absolute temperature of the gas. The average kinetic energy of equal numbers of molecules of any gas is the same at the same temperature.
total pressure (Le Chatelier's principle)
negative
...
kinetic molecular theory
25. The freezing point - boiling point - and vapor pressure of a solution differ from those of the pure solvent by amounts which are directly proportional to the molal concentration of the solute.
partial
combination
equivalent point
colligative property law
26. Rays made up of electrons in basic electron charges.
cathode rays
boiling point elevation
standard atmospheric pressure
decreases
27. The normal boiling point of a liquid is the temperature at which its vapor pressure is 760mm Hg.
state functions (thermodynamics)
specific heat
standard atmospheric pressure
heat capacity
28. Increase in the concentrations of reactants shifts the equilibrium to the ______ - thus increasing the amount of products formed.
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29. The temperature at which a substance's solid and liquid phases are in equilibrium.
activation energy
boiling point elevation
melting point
lower left corner
30. When a hydrogen atom is bonded to a highly electronegative atom - it will become partially _____-charged - and will be attracted to neighboring electron pairs. This creates a hydrogen bond. The more polar the molecule - the more effective the hydroge
decreases
positive charge
combined gas law
zero
31. When the rate of evaporation equals the rate of condensation - the system is in __________.
combination
reversible
phase equilibrium
equilibrium
32. The solubility of gases in liquid or solid solvents always increases with ________ pressure.
isothermal process (thermodynamics)
increasing
moles (Le Chatelier's principle)
partial
33. In a _______ expansion of a gas - the opposing pressure is virtually equal to the pressure exerted by the gas. It is ______ because any slight increase in the external pressure will reverse the process and cause compression to occure.
third law of thermodynamics
specific heat
reversible
Van der Waals
34. A law stating that the vapor pressure of a solution at a particular temperature is equal to teh mole fraction of the solvent in the liquid phase multiplied by the vapor pressure of the pure solvent at the same temperature.
increases
Raoults law
metallic
molar heat of sublimation
35. The energy required to remove an electron from an isolated atom in its ground state.
ionization energy
Raoults law
Le Chatelier's principle
heat capacity
36. The ________ of an element is a number that measerures the relative strength in which the atoms of the element attract valence electrons in a chemical bond - on a scale of 0-4.
non-ideal
kinetic molecular theory
vapor pressure
electronegativity
37. The molecules in a gas collide with one another - but the collisions are perfectly elastic (they result in no net loss of energy).
lower left corner
point particles
kinetic molecular theory
decomposition
38. Any spontaneous change in a chemical reaction will decrease the amount of free energy toward _______ as the process proceeds towards equilibrium.
sublimation
zero
decreases
ideal gas
39. In a closed system - when opposing changes are taking place at equal rates - the system is said to be in _____ _______.
standard atmospheric pressure
sublimation
dynamic equilibrium
bohr model
40. Real gases act in a less than ideal way - especially under conditions of increased pressure and/or decreased temperture. Real gas behavior approaches that of ideal gases as the gas pressure becomes very low. The ideal gas is thus considered a _____ _
increasing
activation energy
activation energy barrier (Le Chatelier's principle)
limiting law
41. Liquids with strong attractive forces have ______ boiling points.
ideal gas
left - right (Le Chatelier's principle)
specific heat
high
42. A theory of the hydrogen atom stating that the electron can exist in only certain stable energy levels and that when the electronic state of the atom changes - it must absorb or emit exactly that amound of energy equal to the difference betweent he f
Raoult's law
decreases
...
bohr model
43. *The nature of the reactants and products affect chemical reactions because some elements and compounds have bonds that when broken/formed - react more rapidly with each other than others.
enthalpy
ionization energy
...
adiabatic process (thermodynamics)
44. **As we proceed to the right of the table - ______-forming properties decrease and _____-forming properties increase.
base - acid
end point
zero
kinetic molecular theory
45. A chemical reaction formed from the union of its elements.
equivalent point
hydrolysis
melting point
combination
46. An increase in temperature causes the position of equilibrium of an exothermic reaction to be shifted to the _____ - while that of and endothermic reactions is shifted to the _______.
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47. A catalyst affects a chemical reaction by lowering the _____ _____ for both the forward and the reverse reactions equally.
activation energy
Van der Waals
combination
Raoults law
48. When a system at equilibrium is disturbed by adding or removing one of hte substances - all the concentrations will change until a new equilibrium point is reached with the same value of Keq.
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49. Gases are composed of tiny - invisible molecules that are widely separated from one another in otherwise empty space.
entropy
kinetic molecular theory
temperature
positive charge
50. The ______ of the system is some particular set of conditions of pressure - temperature - number of moles of each component - and their physical form (ex: gas - liquid - solid or crystalline form).
total pressure (Le Chatelier's principle)
end point
valence
state (thermodynamics)