Chapter 15

Exothermic reactions are reactions that

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

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NGSS.HS-PS1-4

Which of the following is an endothermic process?

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

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NGSS.MS-PS1-4

What kind of graph is this?

• endothermic
• exothermic

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

• A
• B
• C
• D

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

• A
• B
• C
• D

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NGSS.HS-PS1-4

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

• endothermic
• exothermic

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

• endothermic
• exothermic

What kind of reaction is this?

• endothermic

• exothermic

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NGSS.HS-PS1-4

Consider the reaction: 2 H₂O + energy --> 2H₂ + O₂

• exothermic, releasing energy
• exothermic, absorbing energy
• endothermic, absorbing energy
• endothermic, releasing energy

Tags

NGSS.HS-PS1-4

Heat is measured in 

• joules
• grams
• degrees celcius