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chemistry > c1.1.1 particle model revision > Flashcards

c1.1.1 particle model revision Flashcards

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1
Q

What is the particle model?

A

The particle model is a scientific theory that describes the arrangement and movement of particles in a substance.

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2
Q

True or False: According to the particle model, particles are constantly moving.

A

True

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3
Q

Fill in the blank: In a solid, particles are packed ______ together.

A

closely

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4
Q

What happens to the arrangement of particles in a substance when it changes from a solid to a liquid?

A

Particles move further apart

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5
Q

What is the process called when a liquid changes to a gas?

A

Evaporation

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6
Q

What is the term for the process when a gas changes back into a liquid?

A

Condensation

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7
Q

What is the term for the process when a solid changes directly into a gas without becoming a liquid first?

A

Sublimation

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8
Q

What does the term ‘diffusion’ refer to in the context of the particle model?

A

The movement of particles from an area of high concentration to an area of low concentration

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9
Q

What is the formula for calculating density?

A

Density = mass/volume

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10
Q

Fill in the blank: The higher the temperature of a substance, the ______ the particles move.

A

faster

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11
Q

What is the term for the smallest particle of an element?

A

Atom

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12
Q

What is the term for two or more atoms chemically bonded together?

A

Molecule

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13
Q

True or False: In a gas, particles are tightly packed together.

A

False

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14
Q

What is the term for the process when a liquid changes to a solid?

A

Freezing

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15
Q

What is the term for the process when a gas changes to a liquid?

A

Condensation

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16
Q

What is the term for the process when a liquid changes to a gas?

A

Evaporation

17
Q

Fill in the blank: In a liquid, particles are ______ packed together than in a solid.

A

less

18
Q

Fill in the blank: The lower the temperature of a substance, the ______ the particles move.

A

slower

19
Q

What is the term for the process when a solid changes to a liquid?

A

Melting

20
Q

what is a chemical change?

A

chemical transformation from one chemical substance to another

21
Q

what is a physical change?

A

changes affecting the form of a chemical substance, not its composition

22
Q

is rusting a chemical or physical change?

A

chemical change

23
Q

is dissolving table salt in water a chemical or physical change

A

physical

24
Q

is a beaker breaking a chemical or physical change

A

physical

25
Q

is burning charcoal a chemical or physical change

A

chemical

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