Which of the following is not a chemical change?
a) Rusting of iron
b) Melting of iron
c) food is cooked.
d) digestion of food
Answers
Answer: Rusting of iron
b) Melting of iron
c) food is cooked.
d) digestion of food
Explanation:
Answer:
Which of the following are chemical changes? (a) Growth of a plant (b) Rusting of iron (c) Mixing of iron filings and sand (d) Cooking of food (e) Digestion of food (f) Freezing of water (g) Burning of a candle.
Answer:
If the chemical composition is changing, then it is a chemical change, and if the chemical composition is remaining the same, then it is a physical change.
Growth of a plant, rusting of iron, cooking of food, digestion of food, and burning the candle are chemical changes because here is the chemical composition of the substance changes.
What are chemical changes and physical changes?
A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. The five conditions of chemical change: colour change, formation of a precipitate, formation of a gas, odour change, temperature change.
A Physical change affects only physical properties, i.e. shape, size, etc.
They both involve changes in the state of matter. They both have energy changes.