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Chemistry > Elements, Compounds and Mixtures > Flashcards

Elements, Compounds and Mixtures Flashcards

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1
Q

What is an element?

A

Something that contains only one type of atom

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2
Q

What is a compound?

A

When two or more elements chemically bond together

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3
Q

What is a mixture?

A

When various substances are mixed together with no chemical reaction

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4
Q

What is a solvent?

A

A liquid that’ll allow a solute to dissolve in it

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5
Q

What is a solute?

A

A chemical that’ll dissolve in a solvent

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6
Q

What is a solution?

A

A liquid with different chemicals in it

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7
Q

What is a saturated solution?

A

A liquid that can’t take anymore solute

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8
Q

What is solubility?

A

The mass of solute dissolved in 100g of solvent

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9
Q

What are the units for solubility?

A

G/100g

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10
Q

How do you calculate the Rf value for chromatography?

A

Distance from baseline to spot/distance form baseline to solvent front

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11
Q

How does chromatography work?

A

It separates the soluble compounds making up the substance and as the solubility determines how far it climbs the chromatogram

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12
Q

What is the mobile phase in chromatography?

A

The movement of the solvent taking the dyes/inks upwards

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13
Q

What is the stationary phase in chromatography?

A

The chromatography paper

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14
Q

What is a pure substance?

A

Something made up of only one type of molecule

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15
Q

How does a pure substance melt?

A

It melts at a specific temperature

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16
Q

What is an impure substance?

A

Something made up of different substances

17
Q

How does an impure substance melt?

A

It melts over a range of temperatures

18
Q

What is filtration used for?

A

When a solid isn’t dissolved in a liquid

19
Q

What is crystallisation used for?

A

A solid dissolved in liquid

20
Q

What is simple distillation used for?

A

A solution made up of two substances with different boiling points

21
Q

What is fractional distillation used for?

A

Misable liquids

22
Q

What is chromatography used for?

A

Lots of solutes dissolved in a solution

23
Q

What extra things might you do if ethanol is the solvent and why on a chromatogram?

A

Put a lid over the chromatogram in order to stop stuff from evaporating

Chemistry (11 decks)

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