To determine whether the changes in matter depicted in each image are
physical or
chemical, we need to understand the key differences between these two types of changes:
-
Physical Change: A change in which the substance's physical properties (e.g., shape, size, state) are altered, but its chemical composition remains the same. No new substances are formed.
-
Chemical Change: A change in which the substance undergoes a chemical reaction, resulting in the formation of new substances with different chemical properties.
Let’s analyze each image step by step:
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Row 1
1.
Image 1: A person eating a hamburger.
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Explanation: Eating a hamburger involves chewing and breaking it down into smaller pieces, which is a physical change. However, digestion further breaks down the food chemically, but that part is not shown here.
-
Answer: Physical
2.
Image 2: Slicing an apple.
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Explanation: Cutting an apple into slices only changes its shape and size; the apple itself remains chemically unchanged.
-
Answer: Physical
---
Row 2
3.
Image 3: Folding a piece of paper.
-
Explanation: Folding paper changes its shape but does not alter its chemical composition.
-
Answer: Physical
4.
Image 4: Baking a cake.
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Explanation: Baking a cake involves a chemical reaction where ingredients like flour, sugar, and eggs combine to form new substances, changing the chemical composition.
-
Answer: Chemical
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Row 3
5.
Image 5: Nails being hammered into wood.
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Explanation: Hammering nails into wood changes the position and arrangement of the nails and wood but does not alter their chemical composition.
-
Answer: Physical
6.
Image 6: Sugar dissolving in water.
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Explanation: Dissolving sugar in water is a physical change because the sugar molecules simply spread out in the water without forming new substances.
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Answer: Physical
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Row 4
7.
Image 7: An apple rotting.
-
Explanation: Rotting is a chemical change because it involves decomposition, where the apple's organic matter breaks down into new substances due to microbial activity.
-
Answer: Chemical
8.
Image 8: Paper burning.
-
Explanation: Burning paper is a chemical change because it reacts with oxygen in the air to produce new substances such as carbon dioxide and ash.
-
Answer: Chemical
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Row 5
9.
Image 9: Freezing food in a refrigerator.
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Explanation: Freezing food changes its state from liquid to solid but does not alter its chemical composition.
-
Answer: Physical
10.
Image 10: Frying an egg.
-
Explanation: Frying an egg involves heat causing proteins in the egg to denature and coagulate, forming new substances. This is a chemical change.
-
Answer: Chemical
---
Final Answers
1. Physical
2. Physical
3. Physical
4. Chemical
5. Physical
6. Physical
7. Chemical
8. Chemical
9. Physical
10. Chemical
Boxed Final Answer
\[
\boxed{
\begin{array}{cc}
\text{Physical} & \text{Physical} \\
\text{Physical} & \text{Chemical} \\
\text{Physical} & \text{Physical} \\
\text{Chemical} & \text{Chemical} \\
\text{Physical} & \text{Chemical} \\
\end{array}
}
\]
Parent Tip: Review the logic above to help your child master the concept of physical changes in matter worksheet.
