Endothermic Exothermic
Reaction How alike? Reaction
1.
2.
3.

How different?

Endothermic Reaction / With regard to / Exothermic Reaction
______/ Meaning of prefix and terms
______
equations
p. 361, 362 / ______
Temperature change
labs
Photosynthesis and respiration
p. 362
Examples
P. 361
Endothermic Exothermic
Reaction How alike?(class discussion) Reaction
1. both involve energy
2. Both relate to chemical reactions
3. Both can be shown in a chemical equation

How different?

Endothermic Reaction / With regard to / Exothermic Reaction
Energy (heat) goes in
Energy enters
______
energy is a reactant / Meaning of prefix and terms
______
equations
p. 361, 362 / Energy (heat) goes out
Energy exits
______
energy is a product
Temp. decrease
Vinegar and baking soda / Temperature change
labs / Temp. increase
Yeast and peroxide
photosynthesis / Photosynthesis and respiration
p. 362 / respiration
Chemical cold pack / Examples
P. 361 / Light sticks
Chemical reaction in fire
Chemical reaction inside a battery

Endothermic Reactions vs. Exothermic Reactions

In our labs, vinegar + baking soda was an endothermic reaction because the temperature decreases and the products feel cold.

When peroxide (yeast was a catalyst) decomposes, this is an exothermic reaction because the temperature increases and the products feel warm.

Use pages 361 – 363 to sort the sandwich bag contents.

When you’re sure your information is correct, copy it in the spaces below.

Endothermic Reaction / With regard to / Exothermic Reaction
______/ Meaning of prefix and terms
______
equations
p. 361, 362 / ______
Temperature change
labs
Photosynthesis and respiration
p. 362
Examples
P. 361

Review - Endothermic and Exothermic Reactions.

Read each of the following statements or phrases.

Decide if it describes an endothermic reaction, an exothermic reaction or both.

Write “endo”, “exo” or “both” beside each statement or phrase.

Refer to your graphic organizer and your textbook (pages 361 – 363) for help.

1. Has to do with energy during a chemical reaction.

2. Energy is released during the reaction.

3. Energy is absorbed (used) during the reaction.

4. Contains the root word “thermic” which means “heat”

5. Contains a prefix that means “enter” or “go in.”

6. Contains a prefix that means “exit” or “go out.”

7. Respiration.

8. Photosynthesis

9. Can be represented in a chemical equation.

10. Energy is written as a reactant in a chemical equation.

11. Energy is written as a product in a chemical equation.

12. CH4 + 2O2 à 2H2O + CO2 + energy

13. 2H2O + energy à 2H2 + O2

14. Requires a continuous supply of activation energy in order to keep the

reaction going.

15. The energy released from the products supplies the activation energy

that keeps the reaction going.

16. Requires activation energy to get started.

17. Light sticks would be an example.

18. A chemical cold pack would be an example.

19. The energy provided by a battery would be an example.

20. Fire would be an example.

21. A chemical reaction in which the products are colder than the reactants

would be an example.

ENDOTHERMIC EXOTHERMIC

REACTION REACTION

Energy is released Energy is absorbed (used)

during the reaction during the reaction

prefix that means prefix that means

“enter” or “go in” “exit” or “go out”

Respiration Photosynthesis

energy is a reactant energy is a product

CH4 + 2O2 à 2H2O + CO2 (energy)

2H2O (energy) à 2H2 + O2

requires a large amount requires a small amount

of activation energy of activation energy;

produce energy that

keeps the reaction

going

light sticks, fires chemical cold packs

temperature of reactants temperature of reactants

decreases during reaction increases during reaction

Photosynthesis vs. Respiration

Use the Smart Notebook Sort to complete this chart.

Photosynthesis How alike? Respiration
1.
2.
3.
photosynthesis / With regard to / respiration
______/ Reactants
______
products / ______
Energy
What organisms?
purpose

Endothermic Reactions vs. Exothermic Reactions

One of our labs tomorrow will be an endothermic reaction and the other will be exothermic. Use your textbook pages 361 – 363 to complete the Smart Notebook sort on these types of reactions. Copy your correct answers onto the chart.

Endothermic Exothermic
Reaction How alike? Reaction
1.
2.
3.
Endothermic Reaction / With regard to / Exothermic Reaction
______/ Meaning of prefix and terms
______
equations
p. 361, 362 / ______
Temperature change
labs
Photosynthesis and respiration
p. 362
Examples
P. 361