Energy Changes in Chemistry

What is an Exothermic Reaction?

• Energy is taken in from the surroundings

• Energy is given out to the surroundings

• The reaction gets hotter

• The reaction gets colder

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What is an Endothermic Reaction?

• Energy is taken in from the surroundings

• Energy is given out to the surroundings

• Reaction gets hotter

• Reaction gets colder

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What does this energy profile show?

• An Exothermic reaction

• An Endothermic reaction

• The hill of life

• Energy cannot be created or destroyed, it changes from one form to another

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What does this energy profile show?

• An Exothermic reaction

• An Endothermic reaction

• Trouble at mill

• Energy in the circle of life

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Why are Chemical reactions Exothermic?

• The amount of energy required to break bonds is less than the energy produced from making bonds

• The amount of energy required to break bonds is higher than the energy produced from making bonds

• The amount of energy made from breaking bonds is greater than the energy required to create bonds

• The amount of energy made from breaking bonds is less than the energy required to create bonds

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The Energy required to break bonds is....

• Exothermic

• Endothermic

• Ambithermal

• Less than the energy produced to make the same bond

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Ice cream melting is an example of

• a chemical change
• a physical change
• energy
• an exothermic process

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Energy from a stove is used to grill a sandwich. The chemical changes
involved in toasting the bread are

• endothermic.
• exothermic
• neither endothermic nor exothermic
• both endothermic and exothermic

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NGSS.HS-PS1-4

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The energy transferred between objects at different temperatures is

• chemical energy.
• heat.
• potential energy.
• temperature.

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The temperature 295 K equals

• 18°C.
• 22°C.
• 273°C
• 568°C