Module 3 Flashcards
What are flame tests used for?
Flame tests are used to identify the metal present in a substance
What colour of flame will be produced in barium is present in a substance?
Green🟢
What colour of flame will be produced if calcium is present in a substance?
Orange🟠
What colour of flame will be produced if copper is present in a substance?
Blue/green 🔵🟢
What colour of flame would be produced if lithium was present in a substance?
Orange 🟠
What colour of flame would be produced if sodium was present in a substance?
Yellow 🟡
What colour of flame would be produced if potassium was present in a substance?
Lilac 🟣
What colour of flame would be produced if strontium was present in a substance?
Red 🔴
What can sodium hydroxide be used for?
Sodium hydroxide can be used to test for metals using precipitation
If Iron (II) was detected in a substance using sodium hydroxide, what colour would the precipitate be?
Green 🟢
If Iron (III) was detected in a substance using sodium hydroxide, what colour would the precipitate be?
Red/brown 🔴🟤
If Copper was detected in a substance using sodium hydroxide, what colour would the precipitate be?
Blue 🔵
If aluminium was detected in a substance using sodium hydroxide, what colour would the precipitate be?
White ⚪️
If Magnesium was detected in a substance using sodium hydroxide, what colour would the precipitate be?
White ⚪️
What is the test for oxygen?
It relights a glowing splint
What is the test for carbon dioxide?
It turns limewater milky
What is the test for hydrogen?
It burns with a squeaky pop
What colour is chlorine gas?
Green
How is chlorine usually produced?
Through electrolysis of sea water
How can we test for Chlorine?
We can use electrolysis of copper chloride solution and test for its presence
How does electrolysis of copper chloride work?
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
How can we test for a carbonate?
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
How can we test for sulfates/sulfites?
When barium chloride is added to a sample, if a precipitate is formed we can identify a sulfate/sulfite
How can we test for halide ions?
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
When testing for a halide ion, what colour of precipitate would a chloride solution produce?
White ⚪️
When testing for a halide ion, what colour of precipitate would a bromide solution produce?
Cream
When testing for a halide ion, what colour of precipitate would a iodide solution produce?
Yellow 🟡
How does chromatography work?
Chromatography separates mixtures into pure substances
What is a chromatogram?
A chromatogram is the piece of paper used for chromatography
What is the equation for chromatography?
Rf value= distance travelled by substance/ distance travelled by the solvent
