Enthalpy, Entropy, and Gibbs Free Energy and Spontaneity

Which of the following reactions releases heat to the surroundings?

• Endothermic

• Exothermic

• Both

• Neither

Tags

NGSS.HS-PS1-4

In an endothermic reaction, the enthalpy change (ΔH) is:

• Negative

• Positive

• Zero

• Always decreasing

Tags

NGSS.HS-PS1-4

In an exothermic reaction, the enthalpy change (ΔH) is:

• Negative

• Positive

• Zero

• Always decreasing

Tags

NGSS.HS-PS1-4

Which reaction absorbs heat from the surroundings?

• Combustion

• Condensation

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

A chemical reaction has ΔH = -100 kJ. This reaction is:

• Endothermic

• Exothermic

• Neither

• Cannot be determined

Tags

NGSS.HS-PS1-4

A chemical reaction has ΔH = +200 kJ. This reaction is:

• Endothermic

• Exothermic

• Neither

• Cannot be determined

Tags

NGSS.HS-PS1-4

During an exothermic reaction, the temperature of the surroundings usually:

• Decreases

• Increases

• Stays the same

• Becomes neutral

Tags

NGSS.HS-PS1-4

Melting ice is an example of a(n):

• Exothermic process

• Endothermic process

• Neutral process

• Radioactive process

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which would feel cold to the touch during the reaction?

• Exothermic

• Endothermic

• Both

• Neither

Tags

NGSS.HS-PS1-4

When a chemical cold pack is activated, the cold pack:

• It releases energy

• It absorbs energy

• It produces entropy

• It becomes radioactive

Tags

NGSS.HS-PS1-4