U2.L4: Endothermic and Exothermic

Drag and Drop

When the hand warmer is activated​ ​

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energy is converted into ​

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energy. This makes the particles in the hand warmer vibrate ​

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. When you hold it, the particles in the hand warmer ​ bump into the particles in your hand. Kinetic energy is transferred from the hand warmer which has ​

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energy to your skin which has ​

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. You feel this as heat.

Drag these tiles and drop them in the correct blank above

chemical

thermal

faster

slower

light

more

less

mechanical

electrical

Multiple Select

Which reactions caused an INCREASE in temperature? Choose all that apply.

• A: Baking soda and vinegar

• B: Copper sulfate and aluminum

• C: Calcium chloride and water

• D: Ammonium nitrate and water

Poll

Which reaction do you think would be the best candidate for our egg incubator?

• A

• B

• C

• D

Draw

Draw an arrow between the thermometer and the chemical reaction to show the direction of energy transfer in each reaction.

Dropdown

This model shows an

Select answer

reaction. When the atoms rearrange in the reaction, ​

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energy is absorbed than is released so the temperature goes ​

Select answer

.

Dropdown

This model shows an​

Select answer

reaction. When the atoms rearrange, more energy is ​

Select answer

into the surroundings than is absorbed, so the temperature goes ​

Select answer

.

Multiple Choice

Is Reaction A, baking soda and vinegar, endothermic or exothermic?

• endothermic

• exothermic

Multiple Choice

Is Reaction B, copper sulfate and aluminum, endothermic or exothermic?

• endothermic

• exothermic

Multiple Choice

Is Reaction C, calcium chloride and water, endothermic or exothermic?

• endothermic

• exothermic

Multiple Choice

Is Reaction D, ammonium nitrate and water, endothermic or exothermic?

• endothermic

• exothermic

Poll

Compared to 1Rxn:1Food, what do you predict will happen to the temperature of the FOOD when the REACTION is doubled (2 heat packs)?

• The temperature of the food will not change.

• The temperature will increase more than before.

• The temperature will increase, but not by not by as much as before.

• The food temperature will decrease.

Multiple Choice

Which model demonstrates the energy transfer when the reaction is doubled?

Open Ended

Explain the model.

Poll

Compared to 1Rxn:1Food, what do you predict will happen to the temperature of the food when the FOOD is doubled (with 1 heat pack)?

• The temperature of the food will stay the same.

• The temperature will increase more.

• The temperature will increase, but not by not by as much.

• The temperature of the food will decrease.

Multiple Choice

Which model demonstrates the energy transfer when the food is doubled?

Open Ended

Explain the model.

Open Ended

Next class, we will begin to design our egg incubators. How could we apply what we have learned today to our egg incubators?