12 Worksheets on Chemical Reactions & Chemical equations – MCQ | Multiple Choice Questions – chemistry

Last updated on June 12th, 2021 at 01:53 pm

Chemical Reactions & Chemical Energy – MCQ Worksheet (with answer) – set 10

1. Which statement describes a role of energy in chemical reactions?
   a. Energy is created in exothermic reactions.
   b. Energy is always released in chemical reactions.
   c. Energy is needed for chemical reactions to start.
   d. Energy is destroyed in endothermic reactions.
2. The energy needed for photosynthesis is in the form of
   a. glucose.
   b. oxygen.
   c. light.
   d. heat.
3. When products have less chemical energy than reactants, a chemical reaction
   a. is endothermic.
   b. is exothermic.
   c. absorbs energy.
   d. two of the above
4. According to the law of conservation of energy, energy
   a. cannot be created.
   b. cannot be destroyed.
   c. cannot change form.
   d. two of the above
5. Factors that affect reaction rates include
   a. temperature.
   b. concentration.
   c. surface area.
   d. all of the above
6. Crushing a solid reactant into a powder will
   a. decrease the reactant’s surface area.
   b. increase the rate of the reaction.
   c. decrease the concentration of products.
   d. increase the temperature of reactants.
7. Which statement about catalysts is true?
   a. They change the rate of chemical reactions.
   b. They are reactants in chemical reactions.
   c. They are used up in chemical reactions.
   d. two of the above

Answers to MCQ Worksheet

Multiple Choice

1. c
2. c
3. b
4. d
5. d
6. b
7. a

Chemical Reactions & Chemical Energy- Matching worksheet (Match the definition with a term) – set 11

Matching Assignment:
Match each definition with the correct term.

Definitions
1. energy stored in chemical bonds
2. substance that speeds up chemical reactions
3. turning out heat
4. how fast a reaction occurs
5. energy needed to start a reaction
6. taking in heat
7. number of particles of a substance in a given volume

Terms
a. activation energy
b. catalyst
c. concentration
d. endothermic
e. exothermic
f. reaction rate
g. chemical energy

Answer – Matching Assignment

Matching

1. g
2. b
3. e
4. f
5. a
6. d
7. c

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Chemical Reactions & Chemical Energy- Fill in the Blanks worksheet – set 12

Fill in the Blank: Fill in the blank with the appropriate term.

1. In a(n) __ chemical reaction, less energy is needed to break bonds in reactants than is released when
   bonds form in products.
2. A constant input of energy is needed to keep a(n) __ chemical reaction going.
3. The general equation for a(n) __ chemical reaction is: Reactants -> Products + Energy
4. A drop in temperature is a sign that a chemical reaction is __.
5. Chemical reactions occur more __ when the temperature is higher.
6. A greater concentration of reactants __ the reaction rate.
7. Catalysts increase reaction rates by decreasing the amount of __ energy needed.

Answer – Fill in the Blank (answers)

Fill in the Blank

1. exothermic
2. endothermic
3. exothermic
4. endothermic
5. quickly
6. increases
7. activation

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