Chemical reactions unit test physical science a

Answer 1

Sure! Here's a sample unit test for a Physical Science class focused on chemical reactions. You can use these questions to assess understanding of key concepts related to chemical reactions.

Chemical Reactions Unit Test

Name: ___________________________
Date: ___________________________

Part A: Multiple Choice (1 point each)

1. Which of the following is an indicator of a chemical reaction? a) Change in color
   b) Change in temperature
   c) Production of gas
   d) All of the above

2. The law of conservation of mass states that: a) Mass can be created or destroyed in a chemical reaction.
   b) Mass must be conserved in a closed system.
   c) Mass depends on the type of chemical reaction occurring.
   d) None of the above.

3. In a chemical equation, the substances that undergo the reaction are called: a) Products
   b) Reactants
   c) Catalysts
   d) Solvents

4. Which type of reaction involves the breakdown of a compound into two or more simpler substances? a) Synthesis
   b) Decomposition
   c) Single-replacement
   d) Double-replacement

5. What is produced in a combustion reaction? a) Heat
   b) Light
   c) Water
   d) All of the above

Part B: True or False (1 point each)

6. ___ A catalyst is consumed in a chemical reaction.
7. ___ In a balanced chemical equation, the number of atoms of each element must be the same on both sides.
8. ___ An exothermic reaction absorbs heat from the surroundings.
9. ___ Reactants are found on the right side of a chemical equation.
10. ___ A precipitate is a solid that forms from a solution during a chemical reaction.

Part C: Short Answer (2 points each)

11. Define the term "activation energy."

12. What is the difference between an endothermic reaction and an exothermic reaction?

13. Describe one way to speed up a chemical reaction.

14. Write the balanced chemical equation for the combustion of propane (C₃H₈).

15. Explain what a double-replacement reaction is and provide an example.

Part D: Applying Concepts (3 points each)

16. Given the reaction: \[ A + 2B \rightarrow 3C + D \]
    If 4 moles of A are used, how many moles of B are needed to fully react with A?

17. Identify and describe the five general types of chemical reactions.

Total Points: ___ / 40

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Feel free to modify the questions or the point values to better suit your class's needs!