Students fix three physical/chemical change errors — melting ice as chemical, cutting paper as chemical, and baking as physical. Part B has four questions about new substance formation and dissolving sugar. Part C has two questions listing signs of chemical change and explaining why freezing is physical.
Correcting change classification errors — where students focus on appearance rather than substance identity — builds the rule that physical changes preserve substance identity while chemical changes produce new substances.
Style:
Properties of Matter
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
Melting ice is a chemical change because the ice turns into a completely different substance.
Rewrite: Melting ice is a physical change because the water molecules stay the same even though the state changes.
2. Fix the sentence:
Cutting paper is a chemical change because the paper looks different after you cut it.
Rewrite: Cutting paper is a physical change because the paper is still paper even though its shape changed.
3. Fix the sentence:
Baking a cake is a physical change because you can still see the flour and eggs.
Rewrite: Baking a cake is a chemical change because heat causes the ingredients to form a new substance.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. In a physical change, no new substance is formed and the material stays the same.
2. Bubbles forming during a reaction can be a sign of a chemical change.
3. Dissolving sugar in water is a physical change because the sugar molecules remain the same.
4. Burning wood produces ash and smoke, which shows that a chemical change has occurred.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. List three signs that a chemical change has taken place.
Three signs of a chemical change are a color change, gas bubbles being produced, and a temperature change such as the mixture getting warmer or cooler without being heated.
2. Explain why freezing water is a physical change even though it looks very different from liquid water.
Freezing water is a physical change because the water molecules do not change into a different substance. The molecules simply slow down and arrange into a solid structure, but they are still water molecules.
Properties of Matter
★ Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1) Fix the sentence:
Melting ice is a chemical change because the ice turns into a completely different substance.
Rewrite: Melting ice is a physical change because the water molecules stay the same even though the state changes.
2) Fix the sentence:
Cutting paper is a chemical change because the paper looks different after you cut it.
Rewrite: Cutting paper is a physical change because the paper is still paper even though its shape changed.
3) Fix the sentence:
Baking a cake is a physical change because you can still see the flour and eggs.
Rewrite: Baking a cake is a chemical change because heat causes the ingredients to form a new substance.
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) In a physical change, no new substance is formed and the material stays the same.
2) Bubbles forming during a reaction can be a sign of a chemical change.
3) Dissolving sugar in water is a physical change because the sugar molecules remain the same.
4) Burning wood produces ash and smoke, which shows that a chemical change has occurred.
★ Part C: Short Answer
Answer each question in one or two complete sentences.
1) List three signs that a chemical change has taken place.
Three signs of a chemical change are a color change, gas bubbles being produced, and a temperature change such as the mixture getting warmer or cooler without being heated.
2) Explain why freezing water is a physical change even though it looks very different from liquid water.
Freezing water is a physical change because the water molecules do not change into a different substance. The molecules simply slow down and arrange into a solid structure, but they are still water molecules.
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9 Questions
15-20 minutes
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