Phase Changes

Boiling is the term we use to describe which phase change?

• Solid to a liquid
• Solid to a gas
• Gas to a liquid
• Liquid to a gas

Sublimation is the term we use to describe which phase change?

• Liquid to a gas
• Solid to a liquid
• gas to a liquid
• Gas to a solid

When a puddle of water dries up this process is called

• Condensation
• Evaporation
• Melting
• Transpiration

When a substance changes phase, this change is a

• Physical Change
• Chemical Change

What is the boiling point of water?

• 80 degrees Celsius
• 27 degrees Celsius
• 90 degrees Celsius
• 100 degrees Celsius

When water boils, what is inside the bubbles?

• Air
• Oxygen gas
• Water Vapor
• Hydrogen gas

What phase of matter is illustrated in "C"

• solid
• liquid
• gas
• melting

What is labelled "B" on the graph?

• solids
• liquids
• gases
• a phase change

What is happening at "D" on the graph?

• Water is vaporizing
• water is freezing
• water is melting
• the sublimation of water

Why does the graph have two flat lines at "b" and "d"?

• Those are times when we took the water off the hot plate
• Those are phase changes where temperature doesn't change while adding heat
• The line is flat because the water is all in the solid or gas phase
• The line is flat because temperature increases the most at those locations