Temperature and Thermal Energy

Barbara is converting 78°F to degrees Celsius. First, she subtracts 32 from 78. What is the next step? A. multiply 46 by 5/9 B. multiply 46 by 9/5 C. add 273 to 46 D. subtract 273 from 46

A. multiply 46 by 5/9

What is the temperature, in degrees Celsius, of a substance with a temperature of 49K? A. -322°C B. -224°C C. 224°C D. 322°C

B. -224°C

A thermometer is placed in water in order to measure the water's temperature. What would cause the liquid in the thermometer to rise? A. The molecules in the water move closer together. B. The molecules in the thermometer's liquid spread apart. C. The kinetic energy of the water molecules decreases. D. The kinetic energy of the thermometer's liquid molecules decreases.

B. The molecules in the thermometer's liquid spread apart.

Juan measured the temperature of salt water. He then added 273 to the measured value. Which conversion is Juan most likely doing? A. degrees Celsius to degrees Fahrenheit B. degrees Celsius to kelvins C. kelvins to degrees Celsius D. degrees Fahrenheit to degrees Celsius

B. degrees Celsius to kelvins

Which is equal to a temperature of 50°F? A. 18°C B. 46°C C. 10°C D. 32°C

C. 10°C

Which best describes thermal energy? A. It is the difference between internal energies of two or more substances. B. It is the sum of internal energies of two or more substances. C. It is the portion of internal energy that can be transferred from one substance to another. D. It is the portion of potential energy that can be transferred from one substance to another.

C. It is the portion of internal energy that can be transferred from one substance to another.

A thermometer is placed in water in order to measure the water's temperature. What would cause the liquid in the thermometer to drop? A. The molecules in the water spread apart. B. The molecules in the thermometer's liquid spread apart. C. The kinetic energy of the water molecules decreases. D. The kinetic energy of the thermometer's liquid molecules increases.

C. The kinetic energy of the water molecules decreases.

Which type of energy refers to the sum of potential and kinetic energies in the particles of a substance? A motion B. stored C. internal D. heat

C. internal

What happens when the thermal energy of a substance increases? A. The motion of the particles in the substance increases, and the temperature of the substance decreases. B. The motion of the particles in the substance decreases, and the temperature of the substance increases. C. Both the motion of the particles in the substance and the temperature of the substance decrease. D. Both the motion of the particles in the substance and the temperature of the substance increase.

D. Both the motion of the particles in the substance and the temperature of the substance increase.

What happens when heat is removed from water? A. The water particles move farther apart. B. The water changes from a liquid to a gas. C. The temperature of the water increases. D. The kinetic energy of the water particles decreases.

D. The kinetic energy of the water particles decreases.

Hot coffee in a mug cools over time and the mug warms up. Which describes the energy in this system? A. The average kinetic energy of the particles in the mug decreases. B. The average kinetic energy of the particles in the coffee increases. C. Thermal energy from the mug is transferred to the coffee. D. Thermal energy from the coffee is transferred to the mug.

D. Thermal energy from the coffee is transferred to the mug.

Which shows the potential energy of particles in three substances, from least to greatest? A. liquid, solid, gas B. liquid, gas, solid C. solid, liquid, gas D. gas, liquid, solid

D. gas, liquid, solid