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Collins Book 2 - Key Words > Unit 1 - Explaining Physical Changes 2 > Flashcards

Unit 1 - Explaining Physical Changes 2 Flashcards

1
Q

Density

A

The mass of a material per unit volume

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2
Q

Mass

A

The amount of matter in an object measured in kilograms (kg)

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3
Q

Volume

A

The amount of space taken up by an object

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4
Q

Float

A

To move or rest lightly in a liquid or in the air

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5
Q

The number of particles packed in a certain volume

A

Concentration

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6
Q

Concentrated

A

Having a high number of solute particles

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7
Q

Having a low number of solute particles

A

Dilute

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8
Q

Pressure

A

The average force on a certain area

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9
Q

A standard unit of pressure where one kilopascal equals 1000 pascals

A

Kilopascal (kpa)

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10
Q

Diffusion

A

The movement that causes particles in a liquid or gas to spread out evenly

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11
Q

A stable state in which no overall change is occurring

A

Equilibrium

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12
Q

Concentration gradient

A

The difference in concentration

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13
Q

The total mass of the reactants is the same as the total mass of the products

A

Law of Conservation of Mass

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14
Q

Chemical reaction

A

A process which changes substances by the rearrangement of their atoms

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15
Q

The change from one state (solid, liquid or gas) to another

A

Physical change

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16
Q

Efficiency

A

A measure of how well something transfers energy to useful outcomes

17
Q

Can also work in the opposite direction

A

Reversible

18
Q

Exothermic

A

A chemical reaction in which heat energy is given out

19
Q

A chemical reaction in which heat energy is taken in

A

Endothermic

20
Q

Particle model

A

Used to explain the kinetic theory of solids, liquids and gases

21
Q

Mixture of two liquids one water-based, one oil-based.

A

Emulsion

22
Q

Colloid

A

When different states of matter are dispersed together

23
Q

Mixture of gas bubbles trapped inside a liquid

A

Foam

24
Q

Gel

A

Mixture of liquid particles floating in a solid

Collins Book 2 - Key Words (13 decks)

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