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Chemistry

Which of the following would involve the largest production of heat per mole?
a)the burning of gasoline
b)the evaporation of water
c)the fission of uranium
d)the freezing of water
e)the rusting of iron

Is it C)

Which of the following would involve the greatest absorption of heat per mole?
a)the burning of gasoline
b)the evaporation of water
c)the fission of uranium
d)the freezing of water
e)the rusting of iron

Is it B)

When solid ammonium chloride is added to water, the solution feels cold to the hand. Which statement best describes the observation?
a)NH4CL-> NH4CL+ 34kJ
b)The reaction is exothermic
c)NH4CL-> NH4CL DeltaH= 34kJ
d)The system releases heat, so it feels colder
e)The boiling point is increased so it feels colder

Is it c)

Which of the following statements is not true?
a)Delta H is the difference in enthalpy between reactants and products
b)Delta H may be written part of the equation
c)Delta H is negative for an endothermic reaction
d) A reaction consumes heat if Delta H is positve
e) Delta H equals the heat transferred to or from the surroundings.

Is it C?

Can somebody prove/double check if my answers are correct

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Christian

  1. Which of the following would involve the largest production of heat per mole?
    a)the burning of gasoline
    b)the evaporation of water
    c)the fission of uranium
    d)the freezing of water
    e)the rusting of iron

    Is it C)
    I would think so.

    Which of the following would involve the greatest absorption of heat per mole?
    a)the burning of gasoline
    b)the evaporation of water
    c)the fission of uranium
    d)the freezing of water
    e)the rusting of iron

    Is it B)
    I think B is the only endothermic reaction listed.

    When solid ammonium chloride is added to water, the solution feels cold to the hand. Which statement best describes the observation?
    a)NH4CL-> NH4CL+ 34kJ
    b)The reaction is exothermic
    c)NH4CL-> NH4CL DeltaH= 34kJ
    d)The system releases heat, so it feels colder
    e)The boiling point is increased so it feels colder

    Is it c)
    yes

    Which of the following statements is not true?
    a)Delta H is the difference in enthalpy between reactants and products
    b)Delta H may be written part of the equation
    c)Delta H is negative for an endothermic reaction
    d) A reaction consumes heat if Delta H is positve
    e) Delta H equals the heat transferred to or from the surroundings.

    Is it C?
    yes

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    3. ℹ️
    4. 🚩
    DrBob222

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