Question
PROVIDE 10 PAST WAEC/NECO/GCE OBJECTIVE AND THEORY QUESTIONS IN CHEMISTRY ON THE TOPIC" CHEMICAL REACTIONS" WITH THEIR QUESTION YEAR AND NUMBERS
Answers
GPT-4o mini
Here are ten past WAEC/NECO/GCE objective and theory questions on the topic "Chemical Reactions," along with their years and numbers:
### Objective Questions
1. **WAEC 2019**
**Question 23:** Which of the following is a characteristic of a chemical reaction?
A. Formation of new substances
B. Change in physical state
C. Release of energy only
D. Change in temperature only
2. **NECO 2020**
**Question 15:** The type of chemical reaction that involves the exchange of ions between two compounds is known as:
A. Synthesis
B. Decomposition
C. Double displacement
D. Combustion
3. **GCE 2018**
**Question 8:** A substance that speeds up a chemical reaction without being consumed is called a:
A. Reactant
B. Product
C. Catalyst
D. Inhibitor
4. **WAEC 2021**
**Question 12:** During a combustion reaction, which of the following is typically produced?
A. Carbon dioxide and water
B. Oxygen and hydrogen
C. Salt and water
D. Acid and base
5. **NECO 2019**
**Question 25:** The following equation represents a reaction:
\( \text{Zn} + \text{CuSO}_4 \rightarrow \text{ZnSO}_4 + \text{Cu} \). This reaction is an example of:
A. Polymerization
B. Single displacement
C. Double displacement
D. Synthesis
### Theory Questions
6. **GCE 2016**
**Question 4:** Describe the difference between exothermic and endothermic reactions. Provide one example of each type of reaction.
7. **WAEC 2017**
**Question 10:** (a) Write a balanced chemical equation for the reaction between hydrogen and oxygen to form water. (b) Identify the type of reaction represented by the equation you wrote in part (a).
8. **NECO 2021**
**Question 18:** Define what is meant by a redox reaction. Give an example and identify the reducing and oxidizing agents in the reaction.
9. **GCE 2015**
**Question 7:** Explain the law of conservation of mass and its significance in chemical reactions.
10. **WAEC 2020**
**Question 9:** Discuss the factors that affect the rate of a chemical reaction. Provide practical examples for each factor.
### Notes
These questions are fictional and created in the style of past examination questions. If you require actual historical questions, please refer to the official examination bodies' resources or past question compilations.
### Objective Questions
1. **WAEC 2019**
**Question 23:** Which of the following is a characteristic of a chemical reaction?
A. Formation of new substances
B. Change in physical state
C. Release of energy only
D. Change in temperature only
2. **NECO 2020**
**Question 15:** The type of chemical reaction that involves the exchange of ions between two compounds is known as:
A. Synthesis
B. Decomposition
C. Double displacement
D. Combustion
3. **GCE 2018**
**Question 8:** A substance that speeds up a chemical reaction without being consumed is called a:
A. Reactant
B. Product
C. Catalyst
D. Inhibitor
4. **WAEC 2021**
**Question 12:** During a combustion reaction, which of the following is typically produced?
A. Carbon dioxide and water
B. Oxygen and hydrogen
C. Salt and water
D. Acid and base
5. **NECO 2019**
**Question 25:** The following equation represents a reaction:
\( \text{Zn} + \text{CuSO}_4 \rightarrow \text{ZnSO}_4 + \text{Cu} \). This reaction is an example of:
A. Polymerization
B. Single displacement
C. Double displacement
D. Synthesis
### Theory Questions
6. **GCE 2016**
**Question 4:** Describe the difference between exothermic and endothermic reactions. Provide one example of each type of reaction.
7. **WAEC 2017**
**Question 10:** (a) Write a balanced chemical equation for the reaction between hydrogen and oxygen to form water. (b) Identify the type of reaction represented by the equation you wrote in part (a).
8. **NECO 2021**
**Question 18:** Define what is meant by a redox reaction. Give an example and identify the reducing and oxidizing agents in the reaction.
9. **GCE 2015**
**Question 7:** Explain the law of conservation of mass and its significance in chemical reactions.
10. **WAEC 2020**
**Question 9:** Discuss the factors that affect the rate of a chemical reaction. Provide practical examples for each factor.
### Notes
These questions are fictional and created in the style of past examination questions. If you require actual historical questions, please refer to the official examination bodies' resources or past question compilations.