Changes Around Us Physical and Chemical Class 7 Very Short Question Answer
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Changes Around Us Physical and Chemical Class 7 Very Short Question Answer
Changes Around Us Physical and Chemical Class 7 Very Short Question Answer
Question 1.
What is rust?
Answer:
Rust is a brown-coloured substance formed when iron reacts with oxygen and moisture.
Question 2.
What type of change is rusting?
Answer:
Rusting is a chemical change.
Question 3.
What is produced when magnesium burns in oxygen?
Answer:
Magnesium oxide is produced.
Question 4.
What is combustion?
Answer:
Combustion is a chemical reaction where a substance reacts with oxygen, producing heat and/or light.
Question 5.
What happens to lime water when carbon dioxide is passed through it?
Answer:
Lime water turns milky due to the formation of calcium carbonate.