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A liquid is heated till it boils. The boiling point of the liquid is 80°C. Which of the following statements describe what happens if the liquid continues to be heated strongly as it boils?
there is an increase in the internal energy of the body.
The water molecules gain kinetic energy and move faster than before.
The amount of energy needed to melt a unit mass of ice is 3.4 × 105 J.
The temperature of the liquid remains at 80°C, as there is no change in temperature during boiling.
A liquid being boiled.
The heat absorbed during melting is used to break the bonds between the particles.
A higher altitude (height above sea level) increases the rate of evaporation.
the amount of energy required to raise the temperature of a unit mass of a substance by 1°C.
The specific latent heat of fusion of ice is 3.4 × 105 J kg–1. Explain what this means.
there is an increase in the internal energy of the body.
The water molecules gain kinetic energy and move faster than before.
The amount of energy needed to melt a unit mass of ice is 3.4 × 105 J.
The temperature of the liquid remains at 80°C, as there is no change in temperature during boiling.
A liquid being boiled.
The heat absorbed during melting is used to break the bonds between the particles.
A higher altitude (height above sea level) increases the rate of evaporation.
the amount of energy required to raise the temperature of a unit mass of a substance by 1°C.
The rate of evaporation is affected by several factors. Which statement describes one of the factors appropriately?
there is an increase in the internal energy of the body.
The water molecules gain kinetic energy and move faster than before.
The amount of energy needed to melt a unit mass of ice is 3.4 × 105 J.
The temperature of the liquid remains at 80°C, as there is no change in temperature during boiling.
A liquid being boiled.
The heat absorbed during melting is used to break the bonds between the particles.
A higher altitude (height above sea level) increases the rate of evaporation.
the amount of energy required to raise the temperature of a unit mass of a substance by 1°C.
Why does a pure substance melt at a constant temperature?
there is an increase in the internal energy of the body.
The water molecules gain kinetic energy and move faster than before.
The amount of energy needed to melt a unit mass of ice is 3.4 × 105 J.
The temperature of the liquid remains at 80°C, as there is no change in temperature during boiling.
A liquid being boiled.
The heat absorbed during melting is used to break the bonds between the particles.
A higher altitude (height above sea level) increases the rate of evaporation.
the amount of energy required to raise the temperature of a unit mass of a substance by 1°C.
When heat is supplied to a body,
there is an increase in the internal energy of the body.
The water molecules gain kinetic energy and move faster than before.
The amount of energy needed to melt a unit mass of ice is 3.4 × 105 J.
The temperature of the liquid remains at 80°C, as there is no change in temperature during boiling.
A liquid being boiled.
The heat absorbed during melting is used to break the bonds between the particles.
A higher altitude (height above sea level) increases the rate of evaporation.
the amount of energy required to raise the temperature of a unit mass of a substance by 1°C.
Specific heat capacity is defined as
there is an increase in the internal energy of the body.
The water molecules gain kinetic energy and move faster than before.
The amount of energy needed to melt a unit mass of ice is 3.4 × 105 J.
The temperature of the liquid remains at 80°C, as there is no change in temperature during boiling.
A liquid being boiled.
The heat absorbed during melting is used to break the bonds between the particles.
A higher altitude (height above sea level) increases the rate of evaporation.
the amount of energy required to raise the temperature of a unit mass of a substance by 1°C.
A substance consists of particles that are close together and sliding past each other at random. The average speed of the particles is not increasing. Which statement best describes the substance?
there is an increase in the internal energy of the body.
The water molecules gain kinetic energy and move faster than before.
The amount of energy needed to melt a unit mass of ice is 3.4 × 105 J.
The temperature of the liquid remains at 80°C, as there is no change in temperature during boiling.
A liquid being boiled.
The heat absorbed during melting is used to break the bonds between the particles.
A higher altitude (height above sea level) increases the rate of evaporation.
the amount of energy required to raise the temperature of a unit mass of a substance by 1°C.
A beaker of water is cooled from 90 °C to 30 °C. What will happen to the water molecules?
there is an increase in the internal energy of the body.
The water molecules gain kinetic energy and move faster than before.
The amount of energy needed to melt a unit mass of ice is 3.4 × 105 J.
The temperature of the liquid remains at 80°C, as there is no change in temperature during boiling.
A liquid being boiled.
The heat absorbed during melting is used to break the bonds between the particles.
A higher altitude (height above sea level) increases the rate of evaporation.
the amount of energy required to raise the temperature of a unit mass of a substance by 1°C.
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