PS2 Lesson 11

What does the law of conservation of energy state?

• Energy can be created and destroyed.

• Energy can only be transferred or transformed.

• Energy is always increasing.

• Energy is always decreasing.

What is the purpose of multiple trials in an experiment?

• To make the experiment more interesting.

• To ensure the results are reliable and not due to chance.

• To reduce the time taken for the experiment.

• To increase the complexity of the experiment.

Which state of matter has particles that move very quickly and spread out?

• Solid

• Liquid

• Gas

• Plasma

What is thermal energy?

• Energy stored in chemical bonds.

• Energy from the movement of particles in matter.

• Energy from nuclear reactions.

• Energy from electrical currents.

What is heat in terms of thermal energy transfer?

• Energy stored in an object

• Energy that flows from a cold object to a hot object

• Thermal energy in transit due to temperature difference

• Energy that remains constant in a system

What is a characteristic of a closed system?

• It exchanges matter with its surroundings

• It allows energy to be transferred in and out

• It cannot transfer energy or matter

• It only exchanges matter, not energy

What happens to a cold can of soda in a warm room according to the concept of a closed system?

• The soda cools down further

• The soda remains at the same temperature

• Heat from the room transfers to the soda

• The soda exchanges matter with the air

What is thermal equilibrium in a closed system?

• When energy is unevenly distributed

• When energy transfer occurs between parts

• When energy is the same throughout the system

• When particles stop moving

What is thermal equilibrium?

• When heat is evenly distributed in a system

• When one part of a system is hotter than another

• When energy is constantly added to a system

• When a system is losing heat to its surroundings

What happens when 200.0 mL of water at 176.0°F is mixed with 100.0 mL of water at 50.0°F?

• The water reaches a uniform temperature

• The hot water becomes hotter

• The cold water becomes colder

• The water remains at their initial temperatures