Module 3

Question 1

What are flame tests used for?

Answer 1

Flame tests are used to identify the metal present in a substance

Question 2

What colour of flame will be produced in barium is present in a substance?

Answer 2

Green🟢

Question 3

What colour of flame will be produced if calcium is present in a substance?

Answer 3

Orange🟠

Question 4

What colour of flame will be produced if copper is present in a substance?

Answer 4

Blue/green 🔵🟢

Question 5

What colour of flame would be produced if lithium was present in a substance?

Answer 5

Orange 🟠

Question 6

What colour of flame would be produced if sodium was present in a substance?

Answer 6

Yellow 🟡

Question 7

What colour of flame would be produced if potassium was present in a substance?

Answer 7

Lilac 🟣

Question 8

What colour of flame would be produced if strontium was present in a substance?

Answer 8

Red 🔴

Question 9

What can sodium hydroxide be used for?

Answer 9

Sodium hydroxide can be used to test for metals using precipitation

Question 10

If Iron (II) was detected in a substance using sodium hydroxide, what colour would the precipitate be?

Answer 10

Green 🟢

Question 11

If Iron (III) was detected in a substance using sodium hydroxide, what colour would the precipitate be?

Answer 11

Red/brown 🔴🟤

Question 12

If Copper was detected in a substance using sodium hydroxide, what colour would the precipitate be?

Answer 12

Blue 🔵

Question 13

If aluminium was detected in a substance using sodium hydroxide, what colour would the precipitate be?

Answer 13

White ⚪️

Question 14

If Magnesium was detected in a substance using sodium hydroxide, what colour would the precipitate be?

Answer 14

White ⚪️

Question 15

What is the test for oxygen?

Answer 15

It relights a glowing splint

Question 16

What is the test for carbon dioxide?

Answer 16

It turns limewater milky

Question 17

What is the test for hydrogen?

Answer 17

It burns with a squeaky pop

Question 18

What colour is chlorine gas?

Answer 18

Green

Question 19

How is chlorine usually produced?

Answer 19

Through electrolysis of sea water

Question 20

How can we test for Chlorine?

Answer 20

We can use electrolysis of copper chloride solution and test for its presence

Question 21

How does electrolysis of copper chloride work?

Answer 21

Electrolysis is used to separate compounds into its elements. Copper is negatively charged therefore at the negative electrode the copper will begin to separate from the chlorine and at the positive electrode chlorine will begin to bubble and separate

Question 22

How can we test for a carbonate?

Answer 22

By adding hydrochloric acid to a sample if a gas is present it will begin to bubble, a delivery tube is then inserted and takes the gas to a test tube of limewater, if it turns milky we can identify a carbonate

Question 23

How can we test for sulfates/sulfites?

Answer 23

When barium chloride is added to a sample, if a precipitate is formed we can identify a sulfate/sulfite

Question 24

How can we test for halide ions?

Answer 24

By adding silver nitrate into a beaker and observing the results we can identify halide ions. If a precipitate is formed was can identify a halide

Question 25

When testing for a halide ion, what colour of precipitate would a chloride solution produce?

Answer 25

White ⚪️

Question 26

When testing for a halide ion, what colour of precipitate would a bromide solution produce?

Answer 26

Cream

Question 27

When testing for a halide ion, what colour of precipitate would a iodide solution produce?

Answer 27

Yellow 🟡

Question 28

How does chromatography work?

Answer 28

Chromatography separates mixtures into pure substances

Question 29

What is a chromatogram?

Answer 29

A chromatogram is the piece of paper used for chromatography

Question 30

What is the equation for chromatography?

Answer 30

Rf value= distance travelled by substance/ distance travelled by the solvent