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grade 8 science > TOPIC 2 > Flashcards

TOPIC 2 Flashcards

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1
Q

what is a pure substance

A

a pure substance contains only one type pf particle. can exist in three states of matter solid, liquid, or gas.

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2
Q

what is a mixture

A

all mixtures contain two or more pure substances. Which have their Own distinct properties.

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3
Q

what is a homogenous mixture

A

appear to be one substance particles of different substances are intermingled.

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4
Q

what is an example of a homogenous mixture

A

vinegar, clear air

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5
Q

what is a heterogenous mixture

A

Two or more parts can be seen different kinds of particles stay together

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6
Q

what is an example of a heterogenous mixture

A

soil, blood, concrete

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7
Q

what is homogenous also known for

A

a solution

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8
Q

what is heterogenous also known for

A

mechanical mixtures.

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9
Q

what is an example of a element

A

iron, gold oxygen

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10
Q

what is an example of compounds

A

water, salt, sugar

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11
Q

what is suspension

A

a heterogenous mixture, in which the particles settle slowly after mixing.

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12
Q

what is an example of suspension

A

orange juice.

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13
Q

what is colloid

A

a heterogenous mixture in which the particles do not settle at all.

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14
Q

an example of colloid would be

A

fog

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15
Q

to disperse the particles for a longer period of time, and emulsifying agent (like protein) is used to form an

A

emulsion

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16
Q

and example of emulsion would be

A

mayonaise

17
Q

what are mechanical mixtures

A

mixtures that are obviously two or more substances are called mechanical mixtures.

18
Q

what are the separate parts of the mechanical mixtures called

A

phases

19
Q

what makes materials dissolve

A

Forming a solution by mixing two or more materials together is called dissolving.

20
Q

how does dissolving occur

A

it occurs because of the attraction between the particles

21
Q

when dissolving occurs there may be stronger attraction to the particles of another substance, than to the particles of the same substance. true or false

A

true

22
Q

what is the solute

A

the solute is the substance that dissolves in a solvent.

23
Q

what is the solvent

A

The solvent is the substance that dissolves the solute to from a solution

24
Q

what does soluble mean

A

means to be able to be dissolved is a particlular solvent

25
Q

solutes and solvents can be

A

gases or liquids

26
Q

why is water called universal solvent

A

because it can dissolve so many materials

27
Q

how much % of the water on Earth is ocean water

A

97%

28
Q

what is agitiation

A

stirring or shaking helps the solutes to dissolve faster.

29
Q

the limit to concentration is called

A

solubility

30
Q

what is a saturated solution

A

is one in which no more solute will dissolve in a specific amount of solvent at a specific temperature

31
Q

what is a unsaturated solution

A

is one in which more solute can be dissolved in a specific solvent at the same specific temperature

32
Q

this is an example of what

A

a solubility chart

33
Q

what is a super satureated solution

A

a solution that contains more solute than normally dissolve . at a certain temperature.

34
Q

what does isoluble mean

A

not able to be dissolved in a particular solvent

35
Q

what will happen when you try to add more solute to a saturated solution. Using the particle theory matter

A

It will become a solid because the saturated solution can not contain more solute.

36
Q

certain solvents are used for special circumstances because what?

A

they will dissolve some solutes that water and other solvents cannot

37
Q

the earth is rich in?

A

Natural mixtures

38
Q
A

grade 8 science (22 decks)

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