Question

part 4: multi-select: select all answers that are correct by placing an “x” in the box next to the answer(s) you choose

1. select all the processes that require the addition of heat.

freezing melting condensation boiling

1. which of the following describe the particles in a liquid?

they are close together they are in fixed position
they can slide past one another they are very far apart

1. what are some characteristics of gases?

no definite shape particles are packed tightly together
particles move randomly and quickly definite volume

1. a puddle of water outside on a sunny day will eventually disappear. what processes are involved?

evaporation freezing condensation change of state from liquid to gas

1. which of the following will cause a change of state from a liquid to a solid?

remove heat add heat increase particle movement decreasing particle movement

Explanation:

Question 16

• Freezing: Releases heat (exothermic), so no.
• Melting: Requires heat to change solid to liquid (endothermic), yes.
• Condensation: Releases heat (gas to liquid, exothermic), no.
• Boiling: Requires heat to change liquid to gas (endothermic), yes.

• "They are close together": True, liquid particles have moderate intermolecular forces, close.
• "They are in fixed position": False, solids have fixed positions, liquids can move.
• "They can slide past one another": True, liquid particles can move and slide.
• "They are very far apart": False, gases are far apart, liquids are close.

• "No definite shape": True, gases take container's shape.
• "Particles are packed tightly together": False, solids are packed tight, gases are spread.
• "Particles move randomly and quickly": True, gas particles have high kinetic energy, random fast motion.
• "Definite volume": False, gases expand to fill volume, no definite volume.

Answer:

• Melting: X
• Boiling: X

Question 17