Materials Flashcards

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1
Q

Define matter

A

Anything which occupies space and has mass

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2
Q

Properties of solids

A

Definite shape, volume
Hard to compress
Don’t flow

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3
Q

Properties of liquids

A

No definite shape
Definite volume
Hard to compress
Do flow

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4
Q

Properties of gases

A

No definite shape
No definite volume
Easy to compress
Diffuse into all available space

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5
Q

Particle arrangement of liquids

A

more freedom of movement and can slide over each other

Move slowly

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6
Q

Particle arrangement in solids

A

Fixed position
Can vibrate
Strong force
Move slowly

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7
Q

Particle arrangement in gas

A

Farther apart than in liquid
Continuously moving around in all available space
Weak forces
Particles move quickly : this is why they diffuse

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8
Q

Why is it easier to compress gas?

A

There is more space between the particles : in liquid the particles are already very close to each other

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9
Q

Define diffusion

A

The spreading out of materials because of the movement of their particles

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10
Q

Melting point

A

The temperature at which a solid changes to a liquid

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11
Q

Measure the melting point of a solid

A

Seal one end of a melting point tube by holding it in a Bunsen burner

  • benzoic acid in melting point tube
  • melting point tube in aluminum melting point block
  • aluminum melting point block on hot plate, heated
  • note the temperature of when the benzoic acid changes to a colourless liquid from a digital thermometer connected to the melting point tube
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12
Q

Sublimation

A

Solids that change directly form a solid to a gas when heated

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13
Q

Evaporation

A

The changing of a liquid to a gas at the surface of the liquid

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14
Q

Boiling point

A

The temperature at which a liquid changes to a gas throughout the liquid

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15
Q

Condensation

A

The changing of a gas to a liquid : when a gas is cooled, the particles slow down

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