Matter and Energy Quiz Review Part 2

Which property is a measure of the average kinetic energy of the particles in a sample of matter?

• mass

• density

• pressure

• temperature

As the average kinetic energy of a substance increases, the temperature of the sample

• decreases

• increases

• remains the same

• drops to 0

Energy is being added to a given sample. Compared to the Celsius temperature of the sample, the Kelvin temperature

• will always be 273 degrees greater

• will always be 273 degrees lower

• will have the same reading at 0 degrees

• will have the same reading at 273 degrees

Compared to the average kinetic energy of 100 grams of water at 0 degrees Celsius, the average kinetic energy of 100 grams of water at 100 degrees Celsius is

• the same, and the number of molecules is the same

• the same, but the number of molecules is greater

• greater, and the number of molecules is greater

• greater, but the number of molecules is the same

Object A at 50 degrees Celsius and object B at 100 degrees Celsius are placed in contact with each other. Which statement describes the flow of heat between the two objects?

• Heat flows from object A to object B

• Heat flows from object B to object A

• Heat flows in both directions between objects

• No heat flow occurs between the two objects

Which of the following best describes exothermic chemical reactions?

• They always release heat

• They always absorb heat

• They never occur spontaneously

• They always occur spontaneously

Which of the following best describes endothermic chemical reactions?

• They always release heat

• They always absorb heat

• They never occur spontaneously

• They always occur spontaneously

Which change is exothermic?

• freezing of water

• melting of iron

• vaporization of ethanol

• sublimation of iodine

Which change is endothermic?

• freezing of water

• condensation of oxygen gas

• vaporization of ethanol

• deposition of carbon dioxide

When a substance was dissolved in water, the temperature of the water increased. This process is described as

• endothermic, with the release of energy

• endothermic, with the absorption of energy

• exothermic, with the release of energy

• exothermic, with the absorption of energy