Chemistry Chemical Analysis

Front 1

Purity

Back 1

Natural state of a substance - it only contains one element or compound

Hint 1

Can be determined by boiling and melting points

Front 2

Formulations

Back 2

Mixtures with a precise purpose made by a formula

Front 3

Chromatography Phases

Back 3

Stationary - molecules can’t move (solid or v. thick liquid) the paper

Mobile - molecules can move (liquid or gas) the solvent?

Hint 3

More time in mobile phase will move further through stationary phase

Front 4

Rf Value

Back 4

Distance traveled by B/ Distance travelled by A

Hint 4

Ration between Distance travelled by solvent and solute

Front 5

Test for Chlorine

Back 5

Will bleach damp litmus paper turning it white

Front 6

Test for Oxygen

Back 6

If you put a glowing splint inside a test tube of oxygen, the splint will re-light

Front 7

Test for Carbon Dioxide

Back 7

Bubbling carbon dioxide through an aqueous solution of calcium hydroxide (limewater) will turn the solution cloudy

Front 8

Test for Hydrogen

Back 8

Hold a lit splint at the end of a test tube containing hydrogen, a squeaky pop noise will be heard

Front 9

Test for Carbonates

Back 9

Add a couple of drops of solute acid and connect the test tube to limewater. If carbonate ions are present, the limewater will turn cloudy

Front 10

Test for Sulfates

Back 10

Add a couple of drops of dilute HCl and barium chloride solution. If sulfate ions are present, a white precipitate will form

Front 11

Test for Hallides

Back 11

Add a couple of drops of dilute nitric acid and silver nitrate solution. If hallide ions are present, a precipitate will form

Hint 11

Chloride - white, silver chloride

Bromide - cream, silver bromide

Iodide - yellow, silver iodide

Front 12

Flame tests for metal ions

Back 12

Lithium - crimson

Sodium - yellow

Potassium - lilac

Copper - green

Calcium - orange- red

Hint 12

Clean a platinum loop of wire by dipping it in HCL and hold it in flame until it burns without any colour. Dip loop in sample and burrnnnn

Front 13

Metals and coloured precipitates with sodium hydroxide

Back 13

Calcium- white

Copper- blue

Iron II- green

Iron III- brown

Aluminium- white then colourless

Magnesium- white

Hint 13

Add sodium hydroxide to a solution of unknown compound to form an insoluble hydroxide - colour indicates metal

Front 14

Flame emission spectroscopy

Back 14

Sample is placed in a flame, electrons become excited as ions heat up, when electrons drop back to original energy levels, they transfer light (which passes through a spectroscope)

Hint 14

Different wavelengths produce a line spectrum - combination of wl depends on charge and electron arrangement

Front 15

What does intensity of spectrum indictar

Back 15

Concentration of that ion in a solution

Hint 15

Like spectrums can be used to identify ions and calculate their concentrations

Front 16

Flame emission spectroscopy and mixtures

Back 16

Identify different jobs within mixtures - more useful than flame tests (only work for a single ion)

Hint 16

Use reference spectra to find out combination of ions

Front 17

Machine analysis of unknown substances

Back 17

Very sensitive, very fast and very accurate

Front 18

I’m burnt

Back 18

I don’t like it.🥔