Here are 10 One-Word Answer Type Questions from the topic Physical and Chemical Changes (from your provided PDF), with answers and explanations after each question as requested:
One-Word Answer Type Questions
Topic: Physical and Chemical Changes
1. Question: What type of change is melting of ice?
• Answer: Physical
• Explanation: Melting of ice is a physical change because no new substance is formed and it is reversible.
2. Question: What type of change is burning of paper?
• Answer: Chemical
• Explanation: Burning of paper is a chemical change because a new substance is formed and the change is irreversible.
3. Question: What is formed during a chemical change besides a new substance?
• Answer: Heat
• Explanation: Many chemical changes produce heat, light, or sound along with a new substance.
4. Question: What type of change is dissolving salt in water?
• Answer: Physical
• Explanation: Dissolving salt in water is a physical change because salt can be recovered by evaporation.
5. Question: What type of change is rusting of iron?
• Answer: Chemical
• Explanation: Rusting of iron is a chemical change as it forms a new substance called rust.
6. Question: What do we call a change that is temporary and reversible?
• Answer: Physical
• Explanation: Physical changes are temporary and can be reversed easily.
7. Question: What do we call a change that is permanent and irreversible?
• Answer: Chemical
• Explanation: Chemical changes are permanent and cannot be reversed easily.
8. Question: What is the colour of rust formed on iron?
• Answer: Brown
• Explanation: Rust is brown in colour and forms on iron when it reacts with oxygen and moisture.
9. Question: What is added to lime water to test for carbon dioxide?
• Answer: Carbon dioxide
• Explanation: When carbon dioxide is passed through lime water, it turns milky showing a chemical change.
10. Question: What do we call the process of iron reacting with oxygen and water?
• Answer: Rusting
• Explanation: Rusting is a chemical change where iron reacts with oxygen and water to form rust.
If you want, I can now prepare the next set from the topic Rusting of Iron in the same format.
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