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CHEM 101 ACTUAL EXAM QUESTIONS AND CORRECT DETAILED ANSWERS ALREADY GRADED A+ (NEWEST VERSION)
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CHEM 101 ACTUAL EXAM QUESTIONS AND CORRECT DETAILED ANSWERS ALREADY GRADED A+ (NEWEST VERSION) Which of the following is an example of reactant concentration affecting the rate of a reaction? Select the correct answer below: A wooden table burns more quickly in a fire than an iron headboard. ...

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  • September 17, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • chem 101
  • chem 101 actual exam questions

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  • CHEM 101

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CHEM 101 ACTUAL EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS ALREADY
GRADED A+ (NEWEST VERSION)
Which of the following is an example of reactant concentration affecting the rate of a
reaction?
Select the correct answer below:
A wooden table burns more quickly in a fire than an iron headboard.
Five 4-inch diameter saplings burn more rapidly than a 20-inch tree of the same height.
Phosphorus burns much more rapidly in an atmosphere of pure oxygen than in air,
which is about 21% oxygen.
Food spoils more quickly on a kitchen counter than in a refrigerator. - Answer ✔
Phosphorus burns much more rapidly in an atmosphere of pure oxygen than in air,
which is about 21% oxygen.

Which is an example of concentration affecting the rate of reaction? - Answer ✔ a
solution containing two moles of each reactant has a faster instantaneous rate of
reaction than a solution of the same volume with only one mole of each reactant

An increase in temperature of ten degrees Celsius will have what effect on the rate? -
Answer ✔ depends on the reaction

Identify the options below that decrease the rate of a reaction. (select all that apply) -
Answer ✔ Decreasing the temperature of an endothermic reaction
Decreasing the concentration of a second order reactant

All of the following are examples of the temperature of reactants affecting the rate of a
reaction except: - Answer ✔ Phosphorus burns much more rapidly in an atmosphere of
pure oxygen than in air.

Which of the following actions increases the rate of a chemical reaction? (select all that
apply) - Answer ✔ adding a catalyst
lowering the activation energy
increasing the concentration of a first order reactant
increasing the temperature

Which is an example of temperature affecting the rate of reaction? - Answer ✔ a
reaction proceeds more quickly in the laboratory when placed over a Bunsen burner

A catalyst will- - Answer ✔ reduce the activation energy of a reaction

The structure in a reaction that has the highest potential energy is the:

, Select the correct answer below:
reactant
product
transition state
depends on the reaction - Answer ✔ transition state

Which description best fits the definition of activated complex? - Answer ✔ An activated
complex is an unstable combination of reactant species representing the highest energy
state of a reaction system.

Which of the following decreases the rate of a reaction?
Select the correct answer below:
Decreasing the concentration of a reactant that does not appear in the rate law
Heating up the reaction vessel on a hot plate
Taking a break after continuously stirring a very slow reaction for half an hour
Decreasing the concentration of a first order reactant - Answer ✔ Decreasing the
concentration of a first order reactant

Which of the following will burn the fastest?
Select the correct answer below:
A 2-pound log at 50∘C
A 2-pound log at 0∘C
A 2-pound log at room temperature
Each will react at the same rate. - Answer ✔ A 2-pound log at 50∘C


The relative numbers of reactants and products are represented by: - Answer ✔
coefficients

The correct order, from slowest to fastest, according to the rate of reaction of each with
sulfuric acid is: _______.
Select the correct answer below:
a 5-pound iron pipe; 5 pounds of iron shavings; 5 pounds of iron powder; a 5-pound iron
cube
a 5-pound iron cube; a 5-pound iron pipe; 5 pounds of iron shavings; 5 pounds of iron
powder
a 5-pound iron cube; 5 pounds of iron shavings; a 5-pound iron pipe; 5 pounds of iron
powder
a 5-pound iron pipe; 5 pounds of iron powder; 5 pounds of iron shavings; a 5-pound iron
cube - Answer ✔ a 5-pound iron cube; a 5-pound iron pipe; 5 pounds of iron shavings; 5
pounds of iron powder

A catalyst lowers the activation energy of a reaction by: - Answer ✔ providing an
alternate pathway or mechanism

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