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Science mixtures and pure subsances > science pure and mixed substances > Flashcards

science pure and mixed substances Flashcards

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1
Q

What is a homogeneous mixture?

A

It is a mixture where the components are not seen with the naked eye and the components share the same properties.

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2
Q

WHat is a heterogeneous mixture?

A

It is a mixture where the components are distinguished with the naked eye and the components don’t share the same properties.

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3
Q

What substances are classified according to their appearance?

A

Heterogeneous and homogeneous

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4
Q

What substances are classified whether they are or not formed by a combination of different components?

A

Pure substances and Mixtures

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5
Q

What is a pure substance?

A

It is formed by a single substance

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6
Q

What is a mixture?

A

It is a combination of 2 or more substances.

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7
Q

Can mixtures and pure substances be heterogeneous and homogeneous?

A

No, homogeneous substances can only be homogeneous while mixtures can be heterogeneous and homogeneous.

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8
Q

What is a specific property?

A

they are properties exclusive to each pure substance and is not shared by any other.

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9
Q

What things can be classified as a specific property?

A

Boiling point, freezing point, and density.

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10
Q

Are there specific properties in mixtures?

A

No, they depend on the proportions of the pure substances making them.

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11
Q

What are the pure substances that form a mixture called?

A

Components.

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12
Q

Just because pure substances are in a mixture they don’t lose their properties, we can take advantage of that by…

A

Using it to identify and separate them.

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13
Q

We might see components floating on top and the harder substances at the bottom, that is because…

A

Some components have a higher density than others.

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14
Q

Some examples of heterogeneous mixtures are…

A

Granite(s+s), Water and oil(l+l), Smog(g+s), and leaves and water(s+l).

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15
Q

Homogeneous mixtures are also called…

A

Solutions.

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16
Q

Homogeneous mixtures have the same properties because…

A

They are evenly distributed.

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17
Q

Homogeneous mixtures are understood as the substances are divided into such tiny particles that:

A

they cannot be distinguished.

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18
Q

Two types of components can be distinguished in a mixture:

A

Solvent and solute.

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19
Q

What is solvent?

A

The main component of a solution.

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20
Q

What is solute?

A

Components of a mixture of which there are lesser amounts.

21
Q

What are the 3 types of matter a component can be?

A

Solid, liquid, and gas

22
Q

There is a group of heterogeneous mixtures that can almost be distinguished under a microscope. This is homo or hetero?

A

It is almost a homogeneous mixture but it is heterogeneous.

23
Q

Which are the separation methods for heterogeneous mixtures?

A

Sieving, filtration, centrifuging(decantation), decantation.

24
Q

Which are the separation techniques for homogeneous mixtures?

A

Distillation, vaporization, and chromatography.

25
Q

What are decantation, centrifuging, and sedimentation based on?

A

Density

26
Q

What are sieving and filtration based on?

A

Particle size

27
Q

What are evaporation and distillation based on?

A

Boiling point

28
Q

what is evaporation?

A

solid+liquid. The liquid gets vaporized by the heat and the solid will remain.

29
Q

What is the difference between evaporation and distillation?

A

In evaporation, you don’t collect all the components, but in distillation you do.

30
Q

What is fractional distillation?

A

Fractional distillation is used when the boiling points of the liquids in a mixture are very close to each other and they need a more specific way to separate than simple distillation.

31
Q

What is simple distillation?

A

It is when the boiling points of the liquids in a mixture are far from each other and it is easier to separate.

32
Q

What is distillation and how does it work?

A

The mixture is boiled, making the component with the lower boiling point will be evaporated(then collected).

33
Q

What is sieving and how does it work?

A

The mixtures will pass through the sieve, and according to the size of the components, they will get separated.

34
Q

What is filtration and how does it work?

A

A filter paper will block the solids from passing though the funnel, while the liquids will and enter a beaker.

35
Q

Whats is decantation and how does it work?

A

The mixture of L+L will be settling inside a decantation funnel. The component with lower density will be at the top. The funnel will open and the higher density will get collected, and in another beaker, the lower density will get collected.

36
Q

What is an element substance?

A

Where atoms of 1 pure substance are joined together(oxygen) or exist alone(argon).

37
Q

What is a compound substance?

A

Where atoms of 2 or more elements are combined together(oxygen and carbon=carbon dioxide).

38
Q

What state of matter mixture is sieving used on?

A

Solid+solid

39
Q

What state of mattter is decantation used on?

A

Liquid+liquid (inmiscible=not able to mix) or Solid+ liquid (insoluble=incapable of being dissolved->can sediment)

40
Q

What state of matter is filtration used on?

A

Solid+Liquid or Solid+gas

41
Q

What state of matter is evaporization used on?

A

Solid(dissolved) +liquid or liquid+Liquid

42
Q

What state of matter is distillation used on?

A

Liquid+Liquid

43
Q

Example of mixture to use with decantation

A

water+oil or water+sand

44
Q

Example of mixture to use with filtration

A

Tea bag or smog

45
Q

Example of mixture to use with evaporation

A

salt+water or water+sugar

46
Q

Example of mixture to use with sieving

A

rice+sugar or sand+stones

47
Q

Example of mixture to use with distillation

A

wine

48
Q

Is low density at the top or bottom?

A

top

49
Q

Is high density at the top or bottom?

A

bottom

Science mixtures and pure subsances (1 decks)

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