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Chapter 7: Electrochemistry + Chapter 8: Energetics

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Question 1 of 10 0% read

1. Mohamed is learning about prevention of corrosion. He understands that painting is a common method to prevent corrosion. How does painting prevent corrosion?

A By reacting with the metal
B By providing a barrier between the metal and the environment
C By making the metal stronger
D By changing the metal's composition

2. Which type of cell requires an external power source?

A Voltaic cell
B Galvanic cell
C Electrolytic cell
D Dry cell

3. Julia is studying exothermic reactions. She knows that neutralization reactions are exothermic. What is observed when an acid reacts with a base?

A Temperature decreases
B Temperature increases
C Temperature remains constant
D No reaction occurs

4. A reducing agent is a substance that:

A Gains electrons
B Loses electrons
C Accepts oxygen
D Stops reduction

5. Hina is studying activation energy. She knows that activation energy is the minimum energy required for a reaction to occur. How does a catalyst affect the activation energy?

A Increases activation energy
B Decreases activation energy
C No effect on activation energy
D Increases reaction temperature

6. The cathode in a galvanic cell is:

A Negatively charged
B Neutral
C Positively charged
D Insulated

7. Xia is studying corrosion and its prevention. She learns that corrosion can be prevented by making the metal the cathode. What is this method called?

A Galvanizing
B Tinning
C Cathodic protection
D Electroplating

8. George is studying bond formation and bond dissociation. He knows that energy is released when bonds are formed and energy is absorbed when bonds are broken. What is the term for the energy required to break a bond?

A Bond formation energy
B Bond dissociation energy
C Activation energy
D Enthalpy change

9. Which statement is true for exothermic reactions?

A Products have more energy
B Reactants have less energy
C Energy is absorbed
D Energy is released

10. Ibrahim is learning about catalysts. He knows that catalysts speed up reactions without being consumed. What is the function of a catalyst?

A To increase the activation energy
B To provide an alternative pathway with lower activation energy
C To change the enthalpy of reaction
D To consume reactants

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