Thermal Properties Of Matter Question Preview (ID: 50218)
Checking Your Conceptual Understanding About Thermal Properties Of Matter.
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When heat is supplied to a body,
a) there is always an increase in the temperature of the body.
b) the particles in the body move or vibrate faster.
c) there is an increase in the internal energy of the body.
d) there is an increase in bonding between the particles.
The increase in temperature when heat is supplied to a body can be explained by
a) an increase in the average kinetic energy of the particles in the body.
b) an increase in the average kinetic energy of the particles in the body.
c) a decrease in the average speeds of the particles in the body.
d) a decrease in the internal energy of the particles in the body.
Specific heat capacity is defined as
a) the amount of energy required to change a unit mass of a substance from the liquid to the gaseous state.
b) the amount of energy required to change a substance from one phase to another.
c) the amount of energy required to raise the temperature of a unit mass of a substance by 1°C.
d) the amount of energy required to raise the temperature of a substance by 1°C.
Why does a pure substance melt at a constant temperature?
a) Negligible (i.e. very little) heat is absorbed during this process.
b) All pure substances melt at 0°C.
c) The heat absorbed during melting is used to increase the kinetic energies of the particles, and not the temperature of the
d) The heat absorbed during melting is used to break the bonds between the particles.
The specific latent heat of fusion of ice is 3.4 × 105 J kg–1. Explain what this means.
a) The amount of energy needed to melt a piece of ice is 3.4 × 105 J.
b) The amount of energy needed to melt a unit mass of ice is 3.4 × 105 J.
c) The amount of energy needed to boil a unit mass of water is 3.4 × 105 J.
d) The amount of energy needed to boil some water is 3.4 × 105 J.
The rate of evaporation is affected by several factors. Which statement describes one of the factors appropriately?
a) Higher air humidity increases the rate of evaporation.
b) A smaller exposed area increases the rate of evaporation.
c) A lower surrounding temperature increases the rate of evaporation.
d) A higher altitude (height above sea level) increases the rate of evaporation.
A beaker of water is cooled from 90 °C to 30 °C. What will happen to the water molecules?
a) The water molecules expand and move faster than before.
b) The water molecules contract and move slower than before.
c) The water molecules gain kinetic energy and move faster than before.
d) The water molecules gain kinetic energy and move faster than before.
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?
a) A liquid being boiled.
b) A solid being melted.
c) A solid being heated.
d) A liquid being heated.
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?
a) The temperature of the liquid increases to 100°C.
b) The temperature of the liquid drops below 80°C, as evaporation takes place and cools the liquid.
c) The temperature of the liquid remains at 80°C, as the temperature cannot be increased beyond 80°C.
d) The temperature of the liquid remains at 80°C, as there is no change in temperature during boiling.
Which of the following explains the increase in temperature when heat is supplied to a body?
a) A decrease in the internal energy of the particles in the body.
b) A decrease in the average speeds of the particles in the body.
c) An increase in the average spacing of the particles in the body.
d) An increase in the average kinetic energy of the particles in the body.
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