Thermochemistry

Exothermic reactions are reactions that

• release heat
• do not involve heat
• absorb heat
• take place instantaneously

Tags

NGSS.HS-PS1-4

Which of the following is an endothermic process?

• solid to gas
• liquid to solid
• solid to liquid
• gas to liquid

Tags

NGSS.MS-PS1-4

In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is the...

• free energy
• heat of reaction
• heat of fusion
• activation energy

Tags

NGSS.HS-PS1-4

What kind of graph is this?

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

Which of the letters (A-D) represents activation energy?

• A
• B
• C
• D

Tags

NGSS.HS-PS3-1

Which of the letters (A-D) represents the potential energy of the reactants?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-4

Which of the letters (A-D) represents the potential energy of the products?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-4

What kind of reaction has a positive heat of reaction (ΔHr)?

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4

Compared to the potential energy of the products, the potential energy of the reactants above is?

• greater than
• less than
• the same
• impossible to determine

Tags

NGSS.HS-PS1-4

What kind of reaction has a negative heat of reaction (ΔHr)?

• endothermic
• exothermic

Tags

NGSS.HS-PS1-4