# heat and thermodynamics

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### A substance's temperature increases as a direct result of

kinetic energy being added to the particles of the substance.

### Which of the following is a direct cause of substances temperature increase

Kinetic energy is added to the particles of the substance.

It increases

temperature

vibrational

### As the temperature of a substance increases, its volume tends to increase due to

thermal expansion

### If two small beakers of water, one at 70 oC and one at 80 oC, are emptied into a larger beaker, what is the final temperature of the water

the final temperature is between 70 C and 80 degress C

temperature

conduction

### Energy transfer as heat between two objects depends on which of the following

the difference in temperature of the two objects

### Why does sandpaper get hot when it is rubbed against rusty metal

friction between sandpaper and metal increases the temperature of both

### In the presence of friction, not all of the work done on a system appears as mechanical energy. What happens to the rest of the energy provided by work

the remaining energy causes an increase in the interal energy of the system

150 J

### A caloriemeter is used to determine the specific heat capacity of a test metal. If the specific heat capacity of water is know, what quantities can be measures

metal mass, water mass, initial an final temperature of metal and water

### Which of the following describes a substance in which the temperature and pressure remains constant while the substance experiences an inward transfer of energy

substance undergoing a change of state

100 oC

-40

### Which of the following is true during a phase change

temperature remains constant

### If energy is transferred from a table to a block of ice moving across the table, which of the following statements is true

the ice is cooler than the table

### Energy is transferred as heat between two objects, one with temperature of 5 degrees C and the other with a temperature of 20 degrees C. If two other objects are to have the same amount of energy transferred between them, what might their temperatures be

17 degrees C and 32 degrees C

### Which of the following best describes the relationship between two systems in thermal equilibrium

no net energy is exchanged

273 K

temperature

Joule

227 degrees C

delta sign U=

### A figure is shown how the temperature of 10.0 g of ice changes as energy is added. Relates to #'s 26-28 Which of the following statements is correct

the water absorbed energy continously, but the temperature increased only when all of the water was in one phase

22.6 X 10^3 J

C

B

### A figure is shown how the temperature of 10.0 g of ice changes as energy is added. Relates to #'s 26-28 Which of the following is a substance in which the temperature and pressure remain constant while the substance experiences an inward transfer of energy

substance undergoing a change of state

### If there is no temperature difference between a substance and its surroundings, what has occurred on the microscopic level

energy has been transferred from higher energy particles to lower energy particles

### What three properties of a substance affect the amount of energy transferred as heat to or from the substance

mass, temperature change, specific heat

310 K

### Why does sandpaper get hot when it is rubbed against rusty metal

friction is creating the heat

### What accounts for an increase in the temperature of a gas that is kept at constant volume

energy has been added as heat to the gas

0J

### Energy transferred as heat always moves from an object

at high temperature to an object at low temperature

heat

### If there is no temperature difference between a substance and its surroundings, what has occurred on the microscopic level

energy was transferred from higher energy particles to lower energy particles.

### High temperature is related to

high kinetic energy

### Which of two rods has the greatest thermal conductivity

a rod with electrons that are freer to move from atom to atom than are the electrons another rod

isothermal

isothermal

### According to the first law of thermodynamic, the difference between energy transferred to or from a system as heat and energy transferred to or from a system by work is equivalent to which of the following

internal energy change

-20J

specific heat

### In the figure above, what happens to the ice at 0C

the ice begins to melt and change into water

### In the figure above, what happens to the ice at 100C

the temperature stops rising and the water turns into steam

### What is a phase change

is the physical change of a substance from one state (liquid, solid or gas) to another state at constant temperature and pressure

a cyclic process

### How does a real heat engine differ from an ideal cyclic heat engine

a real heat engine is not isolated, so matter enters and leaves the engine

second

### An ideal heat engine has an efficiency of 50 percent Which of the following statements is note true

the amount of energy exhausted as heat equals the energy added to the engine as heat

### What occurs when a system disorder is increased

less energy is available to do work

### Imagine you could observe the individual atoms that make up a piece of matter and that you observe the motion of the atoms becoming more orderly. What can you assume about the system

its entropy is decreasing

Example: