true and false -6
The change of phase requires a large amount of internal energy as
compared to the process of increasing the temperature of a solid.
T
Heat flows spontaneously from a substance with a higher temperature to a substance with a lower temperauture and does not flow spontaneously in the reverse direction
T
Giving internal energy to a solid body at its melting temperature increases the kinetic energy of its molecules
F
The energy required to vaporize 1g of a liquid at its boiling temperature is called the latent heat of melting
F
Two objects with the same temperature can have drastically different amounts of internal energy.
T
If a vapor is forced to condense, it will release the latent heat of vaporization to the environment.
T
The fact that the latent heat of vaporization represents a large amount of internal energy makes this an efficient method for cooling
T
Alcohol sponges are used to cool feverish patients because alcohol evaporates much more quickly than water.
T
If the temperature of a liquid is increased, more molecules will have enough energy to escape and the evaporation rate will therefore be smaller
F
The evaporation process is at equilibrium when the number of molecules bouncing back into the liquid surface is equal to the number of molecules leaving the surface.
T
The saturation vepor density and pressure decrease with temperature but they do not depend on the volume of the container.
F
With the increase in pressure, the boiling point of water raises above 100°C. This phenomenon is used in a pressure cooker or autoclave.
T
Cellular membranes are sensitive to the absolute rather than the relative humidity
F
If the temperature of the air decreases while keeping the actual vapor density constant, the relative humidity will increase.
T
To take place, radiation requires material medium.
F
Cloud formation in the atmosphere takes place when the air temperature increases above the local dew point
F
Conduction is a heat transfer, which occurs by direct interaction of molecules in a hot area with molecules in a cold area
T
Nonmetals are generally much better heat conducters than metals
F
Gases are generally better heat conducters than solids because of the greater number of molecular collisions that occur in the gaseous phase
F
Since the thermal conductivity of air is quite large, air spaces between walls provide insulation against heat loss
F
The three basic processes, by which heat energy is transferred between objects, are heat, conduction and radiation.
F
In physiotherapy, a rubber hot water bottle serves as an insulator to decrease the rate of heat transfer from the water to the body, thus preventing
burns
T
Light is a wave which carries radiant heat with it and travels through vacuum
T
The "emissivity“ of a body is an indicator of its effectiveness as a radiator
T
A light-colored is both a good absorber and a good emitter of visible light
F
The temperature of an organism would rise very rapidly if there were no efficient mechanisms of removing the excess energy from the body as heat
T
Evaporation of perspiration removes heat from the body even at ambient temperatures higher than the body temperature
T
Water has a higher specific heat than sand. Therefore, on the beach at night, breezes would blow from the beach to the ocean
T
Heat absorbed or released as a result of phase change is called latent heat
T
visible light emission strongly depends on the color of objects
T