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Chapter 7
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 Import questions





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What is needed for a substance to change state?
Energy
Which state has a fixed volume but takes the shape of its container?
 
Liquid
 
Gas
 
Solid
 
Plasma
How can you tell a diagram shows a gas?
Particles are far apart and move freely
What does the particle model not explain?
 
Color
 
Shape
 
Changes of state
 
Volume
What happens to a solid’s particles when it is heated?
They vibrate faster and move slightly apart
What increases during expansion?
Particle spacing
Which diagram shows particles in a fixed regular arrangement?
Solid
Boiling is a change from what to what?
Liquid to gas
What happens to particle movement during cooling?
They slow down
Which state has no definite shape or volume?
 
Gas
 
Solid
 
Liquid
 
Plasma
Why might mixing two liquids result in a smaller volume?
Particles fit into gaps between each other
What is condensation?
Change from gas to liquid
Which state of matter is easily compressed?
 
Gas
 
Liquid
 
Solid
 
Plasma
How many states exist at the melting point?
Two
What is the reverse of melting?
 
Solidification
 
Boiling
 
Condensation
 
Evaporation
Why do hot fluids rise?
They become less dense due to expansion
What causes a substance to contract?
Cooling
What is expansion?
Increase in particle spacing due to heating
What happens to particles in a gas?
They move freely and randomly
What does a diagram of a boiling substance show?
Both liquid and gas particles
What phase change turns a liquid into a gas?
 
Evaporation
 
Condensation
 
Melting
 
Solidification
What happens to particles when a substance is heated?
They move faster and spread apart
Which state has a fixed shape and volume?
 
Solid
 
Liquid
 
Gas
 
Plasma
What happens to particles during melting?
They gain energy and move more freely
What does the particle model help us understand?
The behavior of solids liquids and gases
Which state of matter has particles far apart and moving quickly?
 
Gas
 
Solid
 
Liquid
 
Plasma
How do particles move in a solid?
Vibrate in fixed positions
What is matter made of?
Small particles
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