Heat & Thermal Energy Review
Substance A has twice the specific heat of substance B. Equal amounts of A and B are mixed together. If substance A gains 28 J of thermal energy, substance B loses ___ J of thermal energy.
28
On the Kelvin scale, a temperature of 60oC is
333 K
One cup of water at 10° Celsius is added to one cup at 160° Celsius. What is the final temperature of the mixture?
85
Container A has 5 kg of water in it. Container B has 2 kg of water in it. If both containers have equal quantities of thermal energy
B has a higher temperature than A
Which of the following statements is true?
Energy as heat flows from a higher temperature to a lower temperature.
Which of the following statements about the kinetic - molecular theory is correct?
Molecules are always in motion, at various speeds.
Equal masses of aluminum and copper, both at 0 oC, are placed in the same insulated can of hot water. Which statement describes this system at equilibrium (the net exchange of internal energy is zero)?
The aluminum, copper, and water have the same temperature.
As the temperature of an object decreases, there is
a decrease in molecular kinetic energy
As the temperature of an object increases, there is
an increase in molecular kinetic energy.
The amount of thermal energy an object contains is _____ related to the amount of the object present.
directly
The amount of thermal energy an object contains is _____ related to the temperature of the substance
directly
The second law of thermodynamics leads us to conclude that
disorder in the universe is increasing with the passage of time.
Due to its large mass, an iceberg has more internal energy than a hot cup of coffee. If the cup of coffee is placed in thermal contact with an iceberg:
energy flows from the cup of coffee to the iceberg.
When you put ice in a drink to cool it off,
heat is transferred from the warmer drink to the cooler ice.
When a cube of hot metal is placed in a beaker of cold water, the temperature of the water
increases
Compared to most substances, water requires ___ thermal energy to raise its temperature.
more
Several students lie in the sun to warm up. The thermal energy is transferred to them using
radiation
To find the amount of thermal energy necessary to raise the temperature of 50 g of solid iron by 20oC it is necessary to know iron's
specific heat
On a sunny day at the beach, the reason the sand gets hot and the water stays relatively cool is attributed to the difference in which property between water and sand?
specific heat capacity
If two substances are placed in contact with each other and no net exchange of internal energy occurs between them, the substances must have the same
temperature
The Celsius degree is ____ the Kelvin.
the same size as
According to the first law of thermodynamics,
the total energy used in any process is conserved
When two objects are at thermal equilibrium,
they have the same temperature
The reason ocean temperatures do not vary drastically is that
water has a relatively high specific heat
