Anonymous
Anonymous asked in Science & MathematicsChemistry · 2 years ago

HELP I AM IN NEED OF CHEMISTRY HOMEWORK HELP?

9. The activation energy for the reaction in this lab is determined by investigating the effects of temperature on reaction rate. Assuming a positive activation energy, Ea, what effect will increasing the temperature have on the rate constant, k?

A. Increasing temperature will decrease the rate constant, k.

B. Increasing temperature will increase the rate constant, k.

C. Increasing temperature will not have an effect on the rate constant, k.

10. How is activation energy, Ea, like the one you determined in the above problem, affected by temperature?

A.Changing temperature will not have an effect on the activation energy, Ea

B. Increasing temperature will increase the activation energy, Ea

C. Increasing temperature will decrease the activation energy, Ea

5. Which of these most accurately describes the end point of the reaction and when the final time should be taken?

A. The sulfuric acid reacts to form water which dilutes the indicator and changes the red/pink color to clear.

B. Bromine reacts with the phenol causing a white solid to form.

C. Once all the phenol has been consumed bromine reacts with the methyl red indicator causing the red/pink color to fade.

D. Phenol reacts with the methyl red indicator causing the red/pink color to fade.

6. The thermometers used in the lab measure in degrees Celsius. In order to perform any calculations and plot your graph what units should your temperature, T, be in?

A.Celcius

B. Farenheit

C. Kelvin

D. Rankine

2 Answers

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  • Dr W
    Lv 7
    2 years ago
    Favorite Answer

    *** (9) ***

    from the arrhenius equation

    .. k = Ao exp(-Ea / RT)

    assuming Ao, Ea, R are all +,

    then increasing T increases k.... . .plug in values and try it if you need to.

    *** 10 ***

    we can assume activation energy is independent of temperature

    *** 5 ***

    see this link

    http://1chemistry.blogspot.com/2011/07/determinati...

    C is the correct choice..

    fyi.. dilution is almost never the reason for an indicator changing color.. meaning you can immediately eliminate A

    *** 6 ***

    if you're using the arrhenius equation, T must be in K

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  • david
    Lv 7
    2 years ago

    9. B. Increasing temperature will increase the rate constant, k.

    10. C. Increasing temperature will decrease the activation energy, Ea

    you try the others

    • Dr W
      Lv 7
      2 years agoReport

      9 is correct.... 10 is not.

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