Thermochemistry
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21 QuestionsShow answers
  • Question 1
    60 seconds
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    Q. Is the combustion of gasoline endothermic or exothermic?
    answer choices
    Endothermic
    Exothermic
  • Question 2
    60 seconds
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    Q. What is the symbol for heat?
    answer choices
    q
    H
    J
    ∘C
  • Question 3
    120 seconds
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    Q.

    What are chemical reactions that absorb energy?

    answer choices

    endothermic

    fast

    slow

    exothermic

  • Question 4
    120 seconds
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    Q.

    What is the study of heat changes that accompany chemical reactions and phase changes?

    answer choices

    energy

    chemistry

    work

    thermochemistry

  • Question 5
    60 seconds
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    Q.

    What is the formula for calculating heat?

    answer choices

    q = mcΔT

    H = ΔH x moles

    H = ΔH x grams

    products - reactants

  • Question 6
    300 seconds
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    Q.

    Convert 42 kJ into joules

    answer choices

    0.042 J

    175.73 J

    42000 J

    10.04 J

  • Question 7
    45 seconds
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    Q.

    What are the two main types of energy?

    answer choices

    endothermic and exothermic

    spontaneous and nonspontaneous

    potential and kinetic

    entropy and enthalpy

  • Question 8
    180 seconds
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    Q.

    Consider the reaction: 2 H2O + energy --> 2H2 + O2

    answer choices

    exothermic because releasing energy

    exothermic because absorbing energy

    endothermic because absorbing energy

    endothermic because releasing energy

  • Question 9
    120 seconds
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    Q. The heat required to raise the temperature of a SUBSTANCE by 1∘C
    answer choices
    calorie
    joule
    specific heat
    4.184 J
  • Question 10
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    Q. The heat required to raise the temperature of WATER 1∘C
    answer choices
    calorie
    joule
    specific heat
    energy
  • Question 11
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    Q. Heat flows from _______ to ______ objects
    answer choices
    cooler to warmer
    warmer to warmer
    warmer to cooler
    cooler to cooler
  • Question 12
    300 seconds
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    Q.

    A 500g piece of aluminum has a temperature of 7°C. What is the heat energy produced? Specific heat of Aluminum is 0.900 J/gºC.

    answer choices

    3000 J

    3000 g

    3150 J

    3150 g

  • Question 13
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    Q.

    What does temperature measure?

    answer choices

    heat

    average kinetic energy

    space

    time

  • Question 14
    300 seconds
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    Q.

    How much heat does an aluminum block absorb if 10.00 grams is heated from 25.0oC to 50.0oC? *Specific heat of aluminum is 0.900 J/goC

    answer choices

    450 J

    -450 J

    225 J

    -225 J

  • Question 15
    120 seconds
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    Q. Durning a phase change the temperature of a substance_________.
    answer choices
    always increases
    always decreases
    always stays the same
    varies
  • Question 16
    300 seconds
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    Q.

    A 24.0 gram sample of copper was heated from 25.0oC to 500.0oC, 4378 J of heat were absorbed, what is the specific heat of copper?

    answer choices

    0.384 J/g°C

    49909200 J/g°C

    2.60 J/g°C

    8.77 J/g°C

  • Question 17
    300 seconds
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    Q.

    The specific heat of platinum is 0.133 J/g°C. How much heat is released when a 10 g piece of platinum cools from 100°C to 50°C?

    answer choices

    66.5 J

    665 J

    0.0266 J

    0.665 J

  • Question 18
    300 seconds
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    Q.

    The temperature of an unknown piece of metal with a mass of 30.00 g changes from 25.0°C to 35.0°C when the metal absorbs 350.0 J of energy. What is the specific heat of the metal?

    answer choices

    1.17 J/g°C

    -1.17 J/g°C

    0.857 J/g°C

    -0.857 J/g°C

  • Question 19
    60 seconds
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    Q.

    Releasing heat into the surroundings occurs during an ___________________ reaction.

    answer choices

    Exothermic

    Endothermic

    Kinetic Energy

    Thermal Energy

  • Question 20
    300 seconds
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    Q.

    A sample of iron receives 50 J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of 0.10 J/g°C, what is the mass of the iron sample?

    answer choices

    25g

    30g

    20g

    50g

  • Question 21
    300 seconds
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    Q.

    If 238 J of heat is absorbed by a sample of metal with a mass of 40.7 g, and it raises the temperature from 20.0°C to 32.4°C, what is the specific heat capacity of the metal?

    answer choices

    2.34 J/g°C

    0.472 J/g°C

    6.13 J/g°C

    0.163 J/g°C

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