Particle model of matter

Watch the video....

About the density of the mistery substance....

• The density of the mystery substance is higher than the density of ice

• The density of the mystery substance is higher than the density of the water

• The density of the mystery substance is the same as the density of ice

• The density of the mystery substance is lower than the density of the water

The particles in liquids and gases are constantly moving. Their movements are

unpredictable: we say the particles move randomly. This motion is called:

• Diffusion

• Melting

• Freezing

• Vaporization

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The speed at which particles diffuse depends on several factors, namely:

• mass of the particles

• state of the particles

• the temperature of the particles

• size of the spaces between particles

• All above

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NGSS.MS-PS3-4

A solid will change into the liquid state at its __________point.

• Melting

• Boiling

• Freezing

• Condensation

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When a gas changes to a liquid, the state change is called:

• Evaporation

• Melting

• Condensation

• Freezing

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__________is measured in kilograms (kg). When we measure small

objects or small amounts of matter we often measure in grams (g) or even

milligrams (mg).

• Chemical properties

• Density

• Volume

• Mass

How are the particles of a liquid different from the particles of a solid?

• Their particles are separated, even though they are not locked into fixed positions

• Their particles are close together, even though they are not locked into fixed positions

• Their particles are compressible

• Their particles are locked into fixed positions

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NGSS.MS-PS1-4

When you mix oil and water, the two materials will eventually separate because they do not mix well. They are:

• Locked in a fixed position

• Compressible

• Immiscible

• Broken