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Science > Chemical tests, bio and chem > Flashcards

Chemical tests, bio and chem Flashcards

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Biology 101 flashcards
1
Q

Test for Glucose (reducing sugar)

A

Benedict’s solution to a sample and heat.

turns blue -> green/orange/brown/brickred. depending on the concentration of glucose.

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2
Q

Test for Starch

A

Iodine to the sample

orange brown -> blue/black

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3
Q

Test for Protein

A

Biuret solution to the sample

blue->violet/purple

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4
Q

Test for Lipids

A

Add ethanol and shake, equal amount of cold water

Cloudy white emulsion forming

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5
Q

Test for Carbonate CO3

anion

A

Add dilute acid

Bubbling, CO2 produced

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6
Q

Test for Chloride solution

anion

A

Acidify with acid and add silver nitrate

White Precipitate

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7
Q

Test for Nitrate NO3

anion

A

Sodium Hydroxide, cover with aluminium foil and warm

Ammonia produced

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8
Q

Test for Sulfate SO4

anion

A

Add acid, and barium nitrate

White precipitate

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9
Q

Ammonium NH4

cation

A

Sodium Hydroxide -> ammonia produced after warming

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10
Q

Calcium Ca

cation

A

Sodium Hydroxide -> white precipitate

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11
Q

Copper Cu

cation

A

Sodium Hydroxide -> light blue precipitate

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12
Q

Iron (II) Fe 2+

cation

A

Sodium Hydroxide -> Green precipitate

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13
Q

Iron (III) Fe 3+

cation

A

Sodium Hydroxide -> Red-Brown precipitate

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14
Q

Zinc (Zn 2+)

cation

A

Sodium Hydroxide -> white precipitate, colourless solution in excess

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15
Q

Test for Ammonia (NH3)

gas

A

Turns damp red litmus paper -> Blue

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16
Q

Test for Carbon DIoxide (CO2)

gas

A

Turns limewater -> milky white

17
Q

Test for chlorine (Cl2)

gas

A

Bleaches damp litmus paper

18
Q

Test for Hydrogen (H2)

gas

A

“Pops” with a lighted splint

19
Q

Test for Oxygen (O2)

gas

A

Relights a glowing splint

20
Q

Colour for Lithium test (Li)

flame test

A

Red

21
Q

Colour for Sodium test (Na)

flame test

A

Yellow

22
Q

Colour for Potassium test (K)

flame test

A

Lilac/Purple

23
Q

Colour for Copper test (Cu)

flame test

A

Blue-Green

24
Q

Test for water x2

A 
White Copper (II) Sulfate -> Blue
Cobalt (II) Chloride -> Pink

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