Energy in Chemical Reactions

The process by which one or more substances change to produce one or more different substances

• Photosynthesis

• Exothermic

• Chemical reaction

• Endothermic

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical reaction or process that releases heat

• Endothermic

• Chemical reaction

• Photosynthesis

• Exothermic

Tags

NGSS.HS-PS1-4

If the reactants have more energy than the products, what type of chemical reaction will occur?

• Exothermic reaction

• Only a physical change will occur.

• Endothermic reaction

• There will not be a reaction.

Tags

NGSS.HS-PS1-4

Endothermic

• The process by which one or more substances change to produce one or more different substances

• A chemical process or reaction that absorbs heat from the surroundings

• The total kinetic (motion) energy of the tiny particles that make up matter.

• When energy from the Sun interacts with matter on Earth.

Tags

NGSS.HS-PS1-4

A campfire is an example of a(n) –

• Physical reaction

• Endothermic reaction

• Exothermic reaction

• Temperature reaction

Tags

NGSS.MS-PS1-4

Students are asked to design a device that uses a chemical reaction that absorbs heat energy in order to chill a beverage. The criteria for the design challenge as provided by the teacher are listed below. The chemical reaction must meet the following criteria: - Produce a drop in temperature of at least 15°C - Require no more than 50 grams total of reactants - Result in products that are not harmful - The reaction should happen in less than one minute One group of students finds that by combining 30 grams of one substance with 25 grams of another substance, they can produce a drop in temperature of 18°C in about 30 seconds. The only product of the reaction is water. This group of students need to redesign their product because they have failed to meet which of the design challenges?

• Produce a drop in temperature of at least 15°C.

• Require no more than 50 grams total of reactants.

• Result in products that are not harmful.

• The reaction should happen in less than one minute.

Tags

NGSS.HS-ETS1-2

NGSS.HS-ETS1-3

Students are challenged to design cold packs for treating injuries. To do this they must find a chemical reaction that absorbs heat energy. The ideal chemical reaction will reach a temperature in the range of 0°C to 4°C and maintain that temperature for a minimum of 20 minutes. Based on the information provided in the table, and a room temperature of 25°C, which reaction best fits the criteria of the design challenge?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

Meals-ready-to-eat (MREs) are packaged meals that include their own disposable heat pack to warm the food. Students are challenged to duplicate MREs in the science classroom using chemical reactions. The final product must be safe and light. Based on the observations, which chemical reaction would be the best choice for making a heat pack?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

In a certain chemical reaction, Reactant 1 and Reactant 2 release thermal energy. Students collect data by measuring the temperature change produced by adding increasing amounts of Reactant 2 to 25 grams of Reactant 1. They graph the data. Students must design a device that uses 25 grams of Reactant 1 and produces the maximum amount of heat with the smallest amount of Reactant 2. How much of Reactant 2 should they use to meet the criteria of the design challenge?

• 10 grams

• 15 grams

• 20 grams

• 25 grams

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS1-2

NGSS.MS-PS3-3

Students are asked to design a device that uses a chemical reaction that absorbs heat energy in order to chill a beverage. The criteria for the design challenge as provided by the teacher are listed below. The chemical reaction must meet the following criteria: •Produce a drop in temperature of at least 15°C •Require no more than 50 grams total of reactants •Result in products that are not harmful •The reaction should happen in less than one minute One group of students finds that by combining 30 grams of one substance with 25 grams of another substance, they can produce a drop in temperature of 18°C in about 30 seconds. The only product of the reaction is water. This group of students need to redesign their product because they have failed to meet which of the design challenges?

• Produce a drop in temperature of at least 15°C.

• Require no more than 50 grams total of reactants.

• Result in products that are not harmful.

• The reaction should happen in less than one minute.

Tags

NGSS.HS-ETS1-2

NGSS.HS-ETS1-3