For a pure substance, boiling point and condensation point are the same.
For a pure substance, boiling point and condensation point are the same.
The correct option is A True
Boiling is the change of state from a liquid to a gas. The boiling point (or condensation point) of a substance is defined as the temperature at which the vapour pressure of the liquid is exactly equal to the external pressure. Above the boiling point, the substance exists as a gas and below, it exists predominately as a liquid.
If a gas is cooled, its particles will eventually stop moving about fast and form a liquid. This is called condensation(change of state from a gas to a liquid) and occurs at the same temperature as boiling. So, the boiling point and condensation point of a pure substance is the same temperature.
And, if any impurities are added to the substance, then excess heat has to be supplied to achieve the same amount of pressure. So, the boiling point and condensation point of an impure substance will not be the same temperature.
True
Boiling is the change of state from a liquid to a gas. The boiling point (or condensation point) of a substance is defined as the temperature at which the vapour pressure of the liquid is exactly equal to the external pressure. Above the boiling point, the substance exists as a gas and below, it exists predominately as a liquid.
If a gas is cooled, its particles will eventually stop moving about fast and form a liquid. This is called condensation(change of state from a gas to a liquid) and occurs at the same temperature as boiling. So, the boiling point and condensation point of a pure substance is the same temperature.
And, if any impurities are added to the substance, then excess heat has to be supplied to achieve the same amount of pressure. So, the boiling point and condensation point of an impure substance will not be the same temperature.
