Question

39. Define 'melting point of a substance ? What is the melting point of ice?
40. Define 'boiling point' of a substance ? What is the boiling point of water?
41. Define the following terms :
(a) Melting (b) Boiling
42. Define the following terms :
(a) Condensation (b) Freezing
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Answer 1

Answer:

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39. Define 'melting point of a substance ? What is the melting point of ice?

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• The melting point is the temperature at which a solid turns to a liquid.
• The melting point at which ice is 32°F

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40. Define 'boiling point' of a substance ? What is the boiling point of water?

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The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. and boiling point of water is100°C.

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41. Define the following terms :

(a) Melting (b) Boiling

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• Boiling➡Boiling is the method of cooking food in boiling water or other water-based liquids such as stock or milk.
• Melting➡Melting, or fusion, is a physical process that results in the phase transition of a substance from a solid to a liquid

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42. Define the following terms :

(a) Condensation (b) Freezing

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Condensation is the process of changing the state of vapour to liquid state when the temperature is lowered beyond a certain limit, while freezing is the process of changing the state of liquid into solid state. when the temperature is lowered beyond a certain limit, called freezing point.

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Answer 2

Answer:

Melting point : The fixed temperature at which a solid changes into its liquid state is called its melting point or fusion point.Melting point of a water an ice is 0°C

Boiling point : The fixed temperature at which a liquid changes into its vapour state is called its boiling point.Boiling point of water is 100°C

Melting

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The process during which a solid changes into its liquid state at a fixed temperature on heating is called melting.

Boiling

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The process during which a liquid changes into its gaseous state at a fixed temperature on heating is called boiling

Condensation

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The process during which gas changes into its liquid state at a fixed temperature on cooling is called condensation.

Freezing

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The process during which a liquid changes into its solid state at a fixed temperature( on cooling) is called freezing or soldification.

Explanation:

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