Common Tests Flashcards by Kate Hill | Brainscape

Q

What is the test for Oxygen?

A

A GLOWING splint/match will RE-LIGHT if OXYGEN is present.

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Q

What is the test for Hydrogen?

A

You will hear a SQUEAKY POP when you place a LIT splint/match into the gas.

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Q

What is the test for Carbon Dioxide?

A

Bubble the gas through LIMEWATER and it will turn cloudy/milky.

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Q

What is the test for Chlorine Gas?

A

DAMP BLUE litmus paper will turn WHITE.

Think of the smell of swimming pools and bleach–this turns clothes white!

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Q

What is the test for Ammonia?

A

DAMP RED litmus paper turns BLUE.
(This means it is alkali)
(It also STINKS)

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Q

What is the test for an Alkene?

A

Add an alkene to BROMINE WATER (orange) and it turns COLOURLESS. (The UNsaturated C=C bond opens and attaches to Bromine ions, turning Bromine water colourless)

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Q

What is the test for Ethene?

A

Add Ethene to BROMINE WATER (orange) and it turns COLOURLESS. (The UNsaturated C=C bond opens and attaches to Bromine ions, turning Bromine water colourless)

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Q

How could you test for Propene?

A

Add Propene to BROMINE WATER (orange) and it turns COLOURLESS. (The UNsaturated C=C bond opens and attaches to Bromine ions, turning Bromine water colourless)

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Q

What is the test for an Unsaturated compound?

A

Add to BROMINE WATER (orange) and it turns COLOURLESS. (The UNsaturated C=C bond opens and attaches to Bromine ions, turning Bromine water colourless)

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Q

What is the test for Ammonium Ions?

A

Add NaOH- (Sodium Hydroxide).
This produces Ammonia gas.
Test for Ammonia…
Damp RED LITMUS Paper will turn BLUE!

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Q

What is the test for NH4+?

A

Add NaOH- (Sodium Hydroxide).
This produces Ammonia gas.
Test for Ammonia…
Damp RED LITMUS Paper will turn BLUE!

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Q

What is the test for water?

A

Add to Copper (II) Sulphate
(blue—wet= hydrated)
(white-dry= anhydrous)
(Heat to dry out!)

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Q

What is the test for PURE water?

A

Pure water will BOIL at 100 C and FREEZE at…

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Q

How can you test to see if water is present?

A

Add to Copper (II) Sulphate
(blue—wet= hydrated)
(white-dry= anhydrous)
(Heat to dry out!)

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Q

What is the test for a Carbonate?

A

Add HCl (Hydrochloric Acid)
This produces Carbon Dioxide
Test for Carbon Dioxide!
(Bubble through limewater–turns milky)

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Q

How could you test for Calcium Carbonate?

A

Add HCl (Hydrochloric Acid)
This produces Carbon Dioxide
Test for Carbon Dioxide!
(Bubble through limewater–turns milky)

Q

How could you test for Copper (II) Carbonate?

A

Add HCl (Hydrochloric Acid)
This produces Carbon Dioxide
Test for Carbon Dioxide!
(Bubble through limewater–turns milky)

Q

How could you test for Magnesium Carbonate?

A

Add HCl (Hydrochloric Acid)
This produces Carbon Dioxide
Test for Carbon Dioxide!
(Bubble through limewater–turns milky)

Q

What is the test for the negative ion, CO3 2- (carbonate)?

A

Add HCl (Hydrochloric Acid)
This produces Carbon Dioxide
Test for Carbon Dioxide!
(Bubble through limewater–turns milky)

Q

What is a test for Anions?

A

These are negative ions! So tests for Carbonates,

Sulfates or Halides all test for Anions.

Q

What is an Anion?

A

A NEGATIVE ION.
(For example: CO3 2- carbonate, SO4 2- sulphate
Cl- Br- I- halides)

Q

What is a Cation?

A

A POSITIVE ION (such as Na+ Ca 2+)

Q

What are the Flame Tests used for?

A

To identify METAL IONS (they will be + and are called CATIONS)

Q

What is the test for Lithium, Li+ ?

A

It BURNS with a CRIMSON-red flame

Platinum loop dipped in HCl and heated. Then into the mystery substance and burn

Q

What is the test for Sodium, Na+ ?

A

It BURNS with a YELLOW-ORANGE flame

Platinum loop dipped in HCl and heated. Then into the mystery substance and burn

Q

What is the test for Potassium, K+ ?

A

It BURNS with a LILAC flame

Platinum loop dipped in HCl and heated. Then into the mystery substance and burn

Q

What is the test for Calcium, Ca 2+ ?

A

It BURNS with a BRICK-RED flame

Platinum loop dipped in HCl and heated. Then into the mystery substance and burn

Q

What is the test for Copper (II), Cu 2+ ?

A

Add SODIUM HYDROXIDE, the colour of the precipitate (insoluble hydroxide) is BLUE.
Cu 2+ and 2OH- –> Cu(OH)2

Q

What is the test for Iron (II), Fe 2+ ?

A

Add SODIUM HYDROXIDE, the colour of the precipitate (insoluble hydroxide) is SLUDGY GREEN.
Fe 2+ and 2OH- –> Fe(OH)2

Q

What is the test for Iron (III), Fe 3+ ?

A

Add SODIUM HYDROXIDE, the colour of the precipitate (insoluble hydroxide) is REDDISH BROWN.
Fe 3+ and 3OH- –> Fe(OH)3

Q

What gas is produced when a Metal Carbonate is heated?

A

CARBON DIOXIDE.

Heat metal Carbonate CO3 to give metal oxide and Carbon Dioxide

Q

What is the test for Sulfate Ions, SO4 2- ?

A

Add HCl (Hydrochloric Acid) and BARIUM CHLORIDE SULFATE. A WHITE PRECIPITATE will be seen.