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Science Grade 7 > Matter and Materials > Flashcards

Matter and Materials Flashcards

Changing Phases

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1
Q

How can something change without changing?

A

When matter changes state(solid-liquid-gas) it does not change what it
is, it changes how it is

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2
Q

True or false, each state is known as a phase

A

True

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3
Q

True or false, elements and compounds (matter) cannot move from one
phase to another

A

False

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4
Q

True or false, elements and compounds only move when physical forces are present.

A

True

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5
Q

How many physical forces are there?

A

Two

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6
Q

What are the two physical forces?

A

Temperature and Pressure

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7
Q

True or false, temperature is a form of energy.

A

True

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8
Q

True or false, pressure is not a form of energy.

A

False

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9
Q

Higher temperature = ?

A

More energy

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10
Q

Lower temperature = ?

A

Less energy

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11
Q

True or false, changing temperature changes phases of matter.

A

True

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12
Q

Higher pressure = ?

A

More energy

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13
Q

lower pressure = ?

A

Less energy

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14
Q

True or false, changing pressure doesn’t change phases of matter.

A

False

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15
Q

True or false, as temperature (energy) increases, matter changes from solid to liquid (freezing point) or liquid to gas (boiling point)

A

True

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16
Q

Define Kindling Point

A

The temperature at which a particular type of matter
combusts

17
Q

True or false, the kindling point is the same for all types of matter

A

False

18
Q

True or false, every solid has a special temperature at
which it changes from a solid to a liquid.

A

True

19
Q

True or false, this is called the “hot spot”

A

False; this is called the “melting point”

20
Q

True or false, water has a melting point of just over 0 -
degrees Celsius

A

True

21
Q

True or false, other solids have a higher melting point

A

True

22
Q

Give an example of solids that have a higher melting point

A

Steel, rock, or plastic

23
Q

What is sublimation/deposition?

A

The transition of a substance directly from the solid to the gas phase without
passing through an intermediate liquid phase.

24
Q

When does sublimation/deposition occur?

A

Occurs at a specific temperature and pressure for specific substances

25
Q

True or false, sublimation/deposition needs a small amount of energy to occur.

A

False; sublimation/deposition requires extra energy to occur

26
Q

Give an example of sublimation

A

Snow will change from a solid to a gas on cold but sunny days (looks like
steam off of a rooftop) and Dry Ice – solidified Carbon Dioxide CO2

Science Grade 7 (6 decks)

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