Spontaneous Reactions

Spontaneous reactions may be extremely slow.

• True

• False

Tags

NGSS.HS-PS1-5

What information do we need to perform a calculation of Gibbs Free Energy?

• Enthalpy of the reaction.

• Entropy of the reaction.

• The temperature of the reaction in Kelvin.

• All of the above are needed.

A reaction has a positive ΔH and a positive ΔS. Which of the following is true?

• It will be spontaneous at all temperatures.

• It will be nonspontaneous at all temperatures.

• It will be spontaneous at low temperatures.

• It will be spontaneous at high temperatures.

Your enthalpy is high and negative but your entropy is also negative. What type of temperature would you want to get a spontaneous reaction?

• low

• high

Your enthalpy is positive and your entropy is positive. What type of temperature would you want to ensure a spontaneous reaction.

• very high

• very low

A spontaneous reaction is more profitable to a company.

• True

• False

Tags

NGSS.HS-PS1-4

True/False: The rate of a chemical reaction is unrelated to the spontaneity of the reaction.

• True

• False

Which of the following statements about spontaneous reactions is true?

• They always occur quickly.

• They always release energy.

• They can be endothermic.

• They always have a negative Gibbs Free Energy change.

Tags

NGSS.HS-PS1-4

What is the primary factor that determines whether a reaction is spontaneous?

• The change in enthalpy (ΔH).

• The change in entropy (ΔS).

• The change in Gibbs Free Energy (ΔG).

• The activation energy.

A reaction is spontaneous at room temperature. What can be inferred about its Gibbs Free Energy change (ΔG)?

• ΔG is positive.

• ΔG is negative.

• ΔG is zero.

• ΔG is greater than the activation energy.