PS Interim 2 Review- Winter 2022

What causes matter to change state (ex: when a liquid turns to a solid)?

• Luck

• Thermal Energy

• Chemical Bonds

• Molecular Cohesion

What vocabulary word can be defined as:

Energy transferred between two objects of different temperatures that moves predictably from warmer to cooler sites until it reaches the same temperature

• Kinetic Energy

• Matter

• Potential Energy

• Heat

In science, the term “heat" is used to describe which of the following?

• The motion of atoms or molecules within a substance

• The transfer of thermal energy from one object to another

• The average temperature of a system over time

• The average kinetic energy of the system as a whole

What happens to water molecules when a large quantity of thermal energy is added to water in the liquid state?

• The more thermal energy added, the greater the attraction between molecules

• The molecules gain kinetic energy, move farther apart, and become a gas.

• The water molecules become packed closer together, and their temperature increases.

• Each molecule gives up kinetic energy and eventually stops moving.

Temperature is not a direct measure of the thermal energy of a system. The total thermal energy of a system depends on its temperature and what other factors?

• The temperature of the systems environment and its location in that environment

• The number of atoms in the system and their molecular weights

• The boiling points and freezing points of the elements that make up the substances in the system

• The number of atoms in the system and conductivity of the material

When temperature increases and energy is released, is that an exothermic or endothermic reaction?

• Endothermic

• Exothermic

True or False: In an exothermic reaction, temperature is stored.

• True

• False

To make a heat pack, energy needs to be ____ and the substance produced must be _____

• absorbed, harmless

• released, toxic

• released, harmless

• absorbed, toxic

Energy flows from warmer temperatures to cooler temperatures

• True

• False

The amount of water molecules in the ice block is equal to the amount of the water molecules in the puddle. True or False?

• False

• True