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Worksheet 36: Energy and chemical reactions Topic 9
Set A: Terms and definitions Objective: By defining these words, you should become more familiar
with energy related terms and their definitions.
Define, neatly and clearly, the following energy of reaction terms.
1. Potential energy
2. Heat (energy) of reactants
3. Heat (energy) of products
4. Heat of reaction ( ∆H)
5. Exothermic reaction Need help? Study Book: Use Glossary
Teacher Preview Copy
Teacher Preview Copy
6. Endothermic reaction
7. Activated complex
8. Potential energy diagram
Set B: Energy of reactions Objective: To test your ability to recall facts related to energy of reactions.
Read and study notes on page 196 -197 set 14-17. As you read fill in the correct words in the blanks.
9. Potential energy of a substance depends on ______________ and ______________ of the substance.
10. ∆H (heat of reaction) is the_____________ between energy of ____________and that of __________.
11. ∆H = _____________________________ - ___________________________________
12. - ∆H means that products of a reaction have ___________ ___________ than the reactants.
13. - ∆H means that a reaction is ____________________ ( ______________ heat) .
14. +∆H means that the products of a reaction have ___________ ___________ than the reactants.
15. +∆H means that a reaction is ___________________ ( ______________ heat). Need help? Study Book Pg 196 - 197 Set 14 - 17
16. In exothermic reactions, products always have ___________ __________ than the reactants
17. In exothermic reactions, energy is always ___________, and temperature of surrounding __________.
18. In endothermic reactions, products always have ___________ __________ than the reactants
19. In endothermic reactions, energy is always ___________, and temperature of surrounding __________.
74 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
Worksheet 36: Energy and chemical reactions Topic 9
Set A: Terms and definitions Objective: By defining these words, you should become more familiar
with energy related terms and their definitions.
Define, neatly and clearly, the following energy of reaction terms.
1. Potential energy
2. Heat (energy) of reactants
3. Heat (energy) of products
4. Heat of reaction ( ∆H)
5. Exothermic reaction Need help? Study Book: Use Glossary
Teacher Preview Copy
Teacher Preview Copy
6. Endothermic reaction
7. Activated complex
8. Potential energy diagram
Set B: Energy of reactions Objective: To test your ability to recall facts related to energy of reactions.
Read and study notes on page 196 -197 set 14-17. As you read fill in the correct words in the blanks.
9. Potential energy of a substance depends on ______________ and ______________ of the substance.
10. ∆H (heat of reaction) is the_____________ between energy of ____________and that of __________.
11. ∆H = _____________________________ - ___________________________________
12. - ∆H means that products of a reaction have ___________ ___________ than the reactants.
13. - ∆H means that a reaction is ____________________ ( ______________ heat) .
14. +∆H means that the products of a reaction have ___________ ___________ than the reactants.
15. +∆H means that a reaction is ___________________ ( ______________ heat). Need help? Study Book Pg 196 - 197 Set 14 - 17
16. In exothermic reactions, products always have ___________ __________ than the reactants
17. In exothermic reactions, energy is always ___________, and temperature of surrounding __________.
18. In endothermic reactions, products always have ___________ __________ than the reactants
19. In endothermic reactions, energy is always ___________, and temperature of surrounding __________.
74 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com
