Chemical Analysis - Facts

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

Front (Question)

Define pure in the everyday sense

Back (Answer)

Natural state, nothing added

Front (Question)

Define pure in the chemical sense

Back (Answer)

A substance that consists of only one type of particle

Front (Question)

Define formulation

Back (Answer)

• Mixure with set proportions • designed to be a useful product

Front (Question)

Define solvent

Back (Answer)

A substance that dissolves a solute Typically a liquid, such as water or alcohol.

Front (Question)

Define solute

Back (Answer)

A substance that is dissolved in a solvent

Front (Question)

Define solution

Back (Answer)

A mixture of a solute and a solvent

Front (Question)

Explain how mixture of salt and water be separated

Back (Answer)

• By evaporation of water • Salt has a higher boiling point than water so remains

Front (Question)

Explain how sand and water be separated

Back (Answer)

• By filtration • Sand particles too big to fit through microscopic filter holes

Front (Question)

Describe the melting point of pure substance compared to mixtures

Back (Answer)

Pure substances have a sharp melting point; mixtures have a range of melting points

#10

Front (Question)

Give the stationary phase in chromatography

Back (Answer)

The substance that does not move - Chromatography paper Examples include silica gel or paper.

#11

Front (Question)

Give the mobile phase in chromatography

Back (Answer)

The solvent that moves through the stationary phase (water or ethanol) This can vary depending on the type of chromatography used.

#12

Front (Question)

State how many spots form for a pure substance in chromatography

Back (Answer)

One spot in a column

#13

Front (Question)

What determines how far a substance travels in chromatography?

Back (Answer)

Solubility * more attracted to stationary phase - less it moves * more attracteted to mobile phase, more it moves

#14

Front (Question)

A substance doesn’t dissolve in water, suggest another mobile phase

Back (Answer)

Ethanol

#15

Front (Question)

A volatile chemical is used as the mobile phase, suggest why a lid is added

Back (Answer)

Prevent evaporation

#16

Front (Question)

Give the equation to calculate Rf value

Back (Answer)

Rf = distance traveled by the substance / distance traveled by the solvent front

#17

Front (Question)

Explain why the line must be drawn in pencil

Back (Answer)

Pencil lines do not dissolve in the solvent

#18

Front (Question)

State the type of wire used in flame testing

Back (Answer)

Nichrome wire (could use platinium)

#19

Front (Question)

Describe how the wire in flame testing is cleaned and explain why this is done

Back (Answer)

Wire in acid then in flame Prevent masking

#20

Front (Question)

What flame is used in flame testing

Back (Answer)

Blue (roaring) (heating) flame

#21

Front (Question)

Give the colour of flame for lithium

Back (Answer)

Crimson

#22

Front (Question)

Give the colour of flame for sodium r

Back (Answer)

Yellow

#23

Front (Question)

Give the colour of flame for potassium

Back (Answer)

Lilac

#24

Front (Question)

Give the colour of flame for calcium

Back (Answer)

Orange-red