Problem Analysis:
The question asks about the nature of the reaction when wood is burned. To solve this, we need to understand the chemical process involved in burning wood and whether it releases or absorbs energy.
#### Key Concepts:
1.
Burning Wood (Combustion):
- Burning wood is a combustion reaction, where wood reacts with oxygen in the presence of heat.
- The general chemical equation for the combustion of wood can be simplified as:
\[
\text{Wood} + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} + \text{Energy}
\]
- This reaction produces carbon dioxide (\(\text{CO}_2\)), water (\(\text{H}_2\text{O}\)), and releases energy in the form of heat and light.
2.
Exothermic vs. Endothermic Reactions:
-
Exothermic Reaction: A reaction that releases energy (usually in the form of heat) to the surroundings.
-
Endothermic Reaction: A reaction that absorbs energy from the surroundings.
3.
Nature of Combustion:
- Combustion reactions are typically exothermic because they release energy. This is why fire feels hot and can produce flames.
Solution:
When wood is burned, the reaction is a combustion process, which is exothermic. This means it releases energy in the form of heat and light. Therefore, the correct answer is:
A. release energy
Explanation of Other Options:
-
B. absorb energy: This would imply that the reaction requires energy input to proceed, which is not the case for combustion.
-
C. neither absorb nor release energy: This is incorrect because combustion definitely releases energy.
-
D. connections release and sometimes absorb energy depending on the kind of wood: While different types of wood may burn at slightly different rates or temperatures, all combustion reactions involving wood are fundamentally exothermic. This option introduces unnecessary complexity and is incorrect.
Final Answer:
\[
\boxed{\text{A}}
\]
Parent Tip: Review the logic above to help your child master the concept of quiz questions year 5.
