Question

5. Melting of wax is example of--------change.(Physical change/ Chemical change)​

Answer 1

Answer:

physical bcuz no new substance formed

Explanation:

Evaporation is the process in which a liquid state of matter (water) is converted into a gaseous state of matter (vapour). In general terms, evaporation is defined as the process in which the liquid state is converted into gas. This process requires heat energy.

Examples of Evaporation

Crystallization

Drying of clothes

Factors That Affect the Evaporation

Temperature: As the temperature increases, the rate of evaporation also increases. Temperature and rate of evaporation are proportional to each other.

Surface area: As the surface area increases, the rate of evaporation increases. The surface area and rate of evaporation are proportional to each other.

Humidity: The rate of evaporation decreases with an increase in humidity. Humidity and the rate of evaporation are inversely proportional to each other.

Wind speed: Increase in wind speed results in increased evaporation. Wind speed and rate of evaporation are proportional to each other.

Answer 2

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Melting of wax is an example of physical change.

• $\large{\boxed{\underline{ \underline{ \rm{Physical \: change}}}}} \checkmark$

Clarification:

Melting of wax is an example of physical change since no new substances are formed in physical change. Physical changes only involve a change in physical properties of a substance like change of state, colour, size, shape, density and volume. Also, they are temporary changes. Thus, Melting of wax is an example of physical change.

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Some characteristics of physical and chemical changes,

$\dag$ Physical changes -

• No new substance is formed.
• A physical change is a temporary change.
• Most of the physical changes are reversible.
• Only physical properties changes during physical change.

$\dag$ Chemical changes -

• A new substance is formed.
• A chemical change is a permanent change.
• Most of the chemical changes are irreversible.
• Both chemical properties and physical properties changes during chemical change.