Changes of State

What happens during conduction?

• Energy is transferred from low temperature to high temperature
• The amount of energy is increased
• Both substances get hotter
• Energy is transferred from high temperature to low temperature

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What happens during conduction on the molecular level?

• Fast moving molecules get larger
• Slow moving molecules get smaller
• Fast molecules transfer energy to slow molecules
• Slow molecules transfer energy to fast molecules

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What is a water molecule made of?

• 1 Oxygen, 2 Hydrogen atoms
• 1 Hydrogen, 2 Oxygen atoms
• Many different molecules of Hydrogen
• 2 Oxygen, 1 Hydrogen atoms

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NGSS.MS-PS1-1

What happens when liquid water evaporates?

• Water molecules break apart into atoms
• The molecules bump past each other
• The molecules move faster and become gas
• The water increases in mass

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Why does hot water evaporate faster than room temperature water?

• Hot water molecules are lighter
• More water molecules move fast enough to break attractive forces
• Room temperature water has more mass
• The water molecules spread further apart

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens when water vapor condenses?

• Cooling water vapor causes molecules to move further apart
• Molecules slow down and their attractions bring them closer
• Colder temperatures speed up the molecules
• Water vapor is less dense than liquid water

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

When water freezes, liquid water turns to solid ice because...

• Water molecules get harder
• Molecules move slowly enough that their attractions keep them fixed
• All liquid water eventually becomes ice
• Ice can float on water

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Ice melts to become liquid water mainly because...

• Molecules move fast enough to break out of fixed positions
• Molecules slow down so that they melt
• Water molecules react with oxygen to produce melting
• Ice is less dense than water

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

If you compare ice and liquid water on the molecular level, you can say that...

• Molecules in liquid water are closer together
• Molecules in ice are closer together
• Molecules in ice slide past each other
• Molecules in liquid water are smaller

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NGSS.MS-PS1-1

NGSS.MS-PS1-4

Identify the three most common states of matter found on Earth.

• Solid, liquid, and gas
• Plasma, solid, and liquid
• Liquid, gas, and plasma
• Solid, liquid, and plasma