Why is burning of a candle involves both...

Why is burning of a candle involves both physical and chemical change?

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### Step-by-Step Solution: 1. **Understanding the Components of a Candle**: - A candle primarily consists of wax (usually paraffin) and a wick made of cotton or another material. 2. **Identifying the Physical Change**: - When a candle is lit, the wax near the flame melts. This melting process is a **physical change** because it involves a change in the state of matter from solid to liquid without altering the chemical composition of the wax. - **Explanation**: The wax changes from solid to liquid, but it remains as wax (C25H52), just in a different state. ...

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The change in which the shape , size, appearance or state of a subtance may alter but its chemical composition remains the same is called a physical change . In a physical change, no new substance is formed. Any change that involves the formation of a new substance and leads to a transformation of chemical identity is called a chemical change. Chemical changes are usually accompanied with heat exchanges. Chemical changes are permanent changes which are usually irreversible. Select the incorrect statement (s). (I) Although ice, water and water vapour all look different and display different physical properties, they are chemically the same. (II) During burning of a candle, both physical and chemical changes take place. (III) Both water and cooking oil are liquid but their chemical characteristics are different. They differe in odour and inflammability. (IV) It is the physical property of oil that makes it different from water.

I and II

II and III

I,II and III

Only IV

Which of the following involves both physical and chemical change?

Burning of a candle

Rusting of iron

Cooking of food

Boiling of water

The change in which the shape , size, appearance or state of a subtance may alter but its chemical composition remains the same is called a physical change . In a physical change, no new substance is formed. Any change that involves the formation of a new substance and leads to a transformation of chemical identity is called a chemical change. Chemical changes are usually accompanied with heat exchanges. Chemical changes are permanent changes which are usually irreversible. Which of the following involves both physical and chemical change?