Endothermic and Exothermic Reactions: What’s the Difference?

Endothermic and Exothermic Reactions: What’s the Difference?
Endothermic and Exothermic Reactions: What’s the Difference?
Endothermic and Exothermic Reactions: What’s the Difference?
Endothermic and Exothermic Reactions: What’s the Difference?
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Standards
NGSSMS-PS1-6
NGSSMS-PS1-2
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Endothermic reactions absorb heat from the environment, and exothermic reactions release it. I use this reading after showing one of the several great videos out there that show endothermic and exothermic reactions (type endothermic exothermic reactions demonstration into your search engine). Students are asked to make a T-chart to organize what they learned from the reading. I follow this activity with a quick lab in which we use salt or a commercial ice-melt product to melt ice (exothermic), plus the old standby baking soda plus vinegar (endothermic).

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NGSSMS-PS1-6
Undertake a design project to construct, test, and modify a device that either releases or absorbs thermal energy by chemical processes. Emphasis is on the design, controlling the transfer of energy to the environment, and modification of a device using factors such as type and concentration of a substance. Examples of designs could involve chemical reactions such as dissolving ammonium chloride or calcium chloride. Assessment is limited to the criteria of amount, time, and temperature of substance in testing the device.
NGSSMS-PS1-2
Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred. Examples of reactions could include burning sugar or steel wool, fat reacting with sodium hydroxide, and mixing zinc with hydrogen chloride. Assessment is limited to analysis of the following properties: density, melting point, boiling point, solubility, flammability, and odor.
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