States and Phases
What state of matter keeps its shape and does not flow?
What do we call the change when a liquid becomes a gas?
Evaporation
If you cut a piece of paper into smaller pieces, is that a physical or chemical change?
Physical change
Define the word "evaporation".
When a liquid becomes a gas.
Which state of matter flows easily, takes the shape of its container, but keeps the same volume?
Liquid
What is the name of the change when a gas becomes a liquid?
Condensation
Burning a piece of wood produces ash and smoke. Is this a physical or chemical change?
Chemical change
Define "condensation".
When a gas becomes a liquid.
Name the state of matter made of widely spaced particles that move freely and fill their container.
Gas
What is the process called when a solid turns directly into a gas without becoming a liquid first?
Sublimation
If salt dissolves in water and can be recovered by evaporating the water, is dissolving salt a physical or chemical change?
Physical change
What does "sublimation" mean?
A solid changes directly into a gas without becoming a liquid.
For each sample below, identify the state of matter (solid, liquid, or gas): ice cube, orange juice, helium in a balloon.
Solid, liquid, gas
Name the change when a gas becomes a solid without first becoming a liquid.
Deposition
List two signs that a chemical change might have happened.
color change and gas produced (others acceptable: temperature change, new smell, formation of a solid)
What is the difference between "melting" and "freezing"?
Melting is changing from solid to liquid; freezing is changing from liquid to solid.
Explain why a liquid can be poured but a solid usually cannot. (mention particles and movement.)
Because the particles in a liquid can move past each other so the liquid can flow; particles in a solid are locked in place.
Give one real-life example of evaporation and one of condensation (each one short phrase).
Example answers — Evaporation: puddles drying; Condensation: water droplets on a cold drink can.
A metal nail left outdoors becomes covered in rust. Explain why this is a chemical change (one or two sentences, simple)
Because rust forms a new substance (iron oxide) when iron reacts with oxygen and water — it's not just a change in shape or state.
Fill in the chart with which phase change goes where: Evaporation, Condensation, Sublimation, Deposition, Melting, Freezing
SOLID -------------------LIQUID---------------------GAS
Mrs. Johnson will judge your answer...