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Science '24 > Physical and Chemical Changes > Flashcards

Physical and Chemical Changes Flashcards

1
Q

(7.1) What is the particle model?

A

The particle model is a model that shows changes of states. It is:

Solid - melts (bonds broken) - liquid
Liquid - freezes - solid
Liquid - evaporates (bonds broken) - gas
Gas - condenses - liquid

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2
Q

(7.1) What are the three states of matter?

A

Solid, liquid, gas

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3
Q

(7.1) What is the factor that causes a material to change state?

A

Heat

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4
Q

(7.1) When does a physical change occur?

A

When matter changes its physical properties but no its chemical nature

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5
Q

(7.1) Name examples of a physical change

A

Change in texture, shape, size, colour, state, volume, mass, weight and density

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6
Q

(7.1) When does a chemical change occur?

A

When matter becomes new or different matter; a new substance is formed

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7
Q

(7.1) What is a precipitate?

A

When two solutions are mixed, a new substance, in the form of a solid, can form. This is called a precipitate.

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8
Q

(7.1) What are some signs of chemical change?

A

Colour change, odour, bubbling and fizzing, light production, smoke and the presence of heat.

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9
Q

(7.1) What is melting?

A

Solid to liquid (energy is added)

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10
Q

(7.1) What is evaporation?

A

Liquid to a gas at the surface (energy is added)

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11
Q

(7.1) What is boiling?

A

Liquid to a gas all throughout (energy is added)

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12
Q

(7.1) What is sublimation?

A

Solid to a gas (energy is added)

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13
Q

(7.1) What is vaporization?

A

Any substance changing to a gas (evaporation, boiling, sublimation)

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14
Q

(7.1) What is condensation?

A

Gas to a liquid (energy is removed)

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15
Q

(7.1) What is freezing?

A

Liquid to a solid (energy is removed)

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16
Q

(7.1) What is deposition?

A

Gas to solid (energy is removed)

17
Q

(7.1) What is solidification?

A

Any substance changing to a solid (freezing, deposition)

18
Q

(7.3) What is a word equation?

A

A word equation is a scientific equation using words
(e.g. hydrochloric acid + magnesium = hydrogen gas)

19
Q

(7.3) What is the word equation for respiration?

A

Glucose + oxygen (produces energy/ATP) = carbon dioxide + water vapour

20
Q

(7.3) What is the word equation for photosynthesis?

A

Carbon dioxide + water = glucose + oxygen gas

21
Q

(7.3) What is the word equation for combustion?

A

Oxygen + hydrogen = water vapour

22
Q

(7.3) What is chemical weathering?

A

Weathering from the air (acid rain, water in the air)

Science '24 (3 decks)

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