Question

which of the following involves both physical and chemical change
a) burning of candle
b) rusting of iron
c) cooking of food
d) boiling of water​

Answer 1

Answer:

The following involves both physical and chemical change is —

d) boiling of water

mark me as brainliest plz.....

Answer 2

The burning of a candle involves both physical and chemical change (option a).

• We know that when the chemical structure of a compound is changed, the change is called a chemical change.
• Also, when only some physical properties of a compound are changed, the change is called a physical change.
• In option a, the burning of a candle is both a physical and chemical change. While burning, the candle wax melts for the heat from the flame. This does not change the chemical structure of wax. This is why this is a physical change.
• Also, some wax burns near the flame of the candle. Burning of the wax changes the chemical structures of wax and produces carbon dioxide, carbon soot, heat, water vapour, and light. So option a is correct.
• In option b, rusting of iron is a chemical change because iron changes into iron oxide in the process. So option b is incorrect.
• Cooking of food is a chemical change because the heat changes the chemical structure of the food after cooking. So option c is incorrect.
• Boiling of water is a physical change because the gaseous water produced after boiling has the same chemical formula as normal water. So option d is also incorrect.

#SPJ3