Exploring Changes of States: Melting and Freezing Points

The video tutorial explores the physical properties of matter, focusing on states of matter and physical changes. It delves into the kinetic theory of matter, explaining how particles move differently in solids, liquids, and gases. Using water as a model, the tutorial illustrates the processes of melting and freezing, highlighting the critical temperatures at which these changes occur. The video emphasizes that these changes are physical, not chemical, and discusses the unique melting and freezing points of substances.

What are physical properties of matter?

• Properties that only apply to liquids

• Properties that involve chemical reactions

• Characteristics that can be observed without changing the matter

• Characteristics that change the type of matter

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NGSS.MS-PS1-4

Which of the following is NOT a physical property of matter?

• Color

• Density

• Conductivity

• Reactivity

According to the kinetic theory of matter, what determines the movement of particles?

• The density of the matter

• The color of the matter

• The state and temperature of the matter

• The type of matter

Tags

NGSS.MS-PS1-4

What happens to solid particles when they are heated but not beyond their melting point?

• They stop moving

• They turn into gas

• They vibrate faster in a fixed place

• They start sliding past one another

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NGSS.MS-PS1-4

What is the process called when a solid turns into a liquid?

• Freezing

• Sublimation

• Melting

• Condensation

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NGSS.MS-PS1-4

Why can't wood be turned into a liquid by heating?

• It is not a solid

• It is already in a liquid state

• Its particles break apart and chemically change before melting

• It has a very high melting point

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NGSS.MS-PS1-4

What is the critical temperature for water to melt?

• 10 degrees Celsius

• 50 degrees Celsius

• 0 degrees Celsius

• 100 degrees Celsius

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NGSS.MS-PS1-4

What is the melting point of a substance?

• The temperature at which a liquid becomes a gas

• The temperature at which a solid becomes a liquid

• The temperature at which a liquid becomes a solid

• The temperature at which a gas becomes a solid

Tags

NGSS.MS-PS1-4

What is the freezing point of a substance?

• The temperature at which a liquid becomes a solid

• The temperature at which a solid becomes a liquid

• The temperature at which a solid becomes a gas

• The temperature at which a gas becomes a liquid

Tags

NGSS.MS-PS1-4

What happens to particles when a liquid freezes?

• They turn into gas

• They gain energy and move faster

• They start sliding past one another

• They arrange themselves in a crystal network and vibrate in place

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4