Unit 5 Lesson 1

What happens when heat is removed from water?

• The water particles move farther apart.
• The water changes from a liquid to a gas.
• The temperature of the water increases.
• The kinetic energy of the water particles decreases.

A thermometer is placed in water in order to measure the water’s temperature. What would cause the liquid in the thermometer to rise?

• The molecules in the water move closer together.
• The molecules in the thermometer’s liquid spread apart.
  
• The kinetic energy of the water molecules decreases.
• The kinetic energy of the thermometer’s liquid molecules increases.

Carmen is heating some water and trying to measure the temperature of water using a Farenheit  thermometer. Which measurement can she expect once the water begins to boil?

• 32°F
• 373°F
  
• 100° F
  
• 212°F

What is the temperature, in degrees Celsius, of a substance with a temperature of 49K?

• 322°C
• –224°C
• 224°C
  
• –322°C
  

Which shows the potential energy of particles in three substances, from least to greatest?

• gas, liquid, solid
  
• solid, liquid, gas
  
• liquid, gas, solid
  
• liquid, solid, gas
  

Hot coffee in a mug cools over time and the mug warms up. Which describes the energy in this system?

• Thermal energy from the coffee is transferred to the mug.
• Thermal energy from the mug is transferred to the coffee.
• The average kinetic energy of the particles in the coffee increases.
• The average kinetic energy of the particles in the mug decreases.

Which best describes thermal energy?

• It is the difference between internal energies of two or more substances.
  
• It is the sum of internal energies of two or more substances.
  
• It is the portion of internal energy that can be transferred from one substance to another.
  
• It is the portion of potential energy that can be transferred from one substance to another.
  

What happens when the thermal energy of a substance increases?

• The motion of the particles in the substance increases, and the temperature of the substance decreases.
• Both the motion of the particles in the substance and the temperature of the substance increase. 
• The motion of the particles in the substance decreases, and the temperature of the substance increases.
• Both the motion of the particles in the substance and the temperature of the substance decrease. 

Which of these indicates that a liquid has transferred thermal energy to the air?

• The liquid decreases in temperature, and its particles lose kinetic energy.
• The liquid increases in temperature, and its particles lose kinetic energy.
• The liquid decreases in temperature, and its particles gain kinetic energy.
• The liquid increases in temperature, and its particles gain kinetic energy.

What does the Law of Conservation of Energy state?

• Energy should be conserved
• Matter can neither be created nor destroyed
• Energy can not be destroyed, only transferred or transformed
• I don't know and I don't care.