chemical tests 4.6 Flashcards

1
Q

test for hydrogen

A

squeaky pop

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2
Q

test for oxygen

A

relights a glowing splint

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3
Q

test for water

A

anhydrous copper sulfate changes from white to blue

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4
Q

test for pure water

A

bp is 100 degrees

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5
Q

test for carbon dioxide

A

bubble through lime water, clear to cloudy

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6
Q

test for chlorine

A

damp blue litmus, blue to white

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7
Q

test for ammonia

A

red litmus, red to blue

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8
Q

what are cations

A

positive ions

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9
Q

how to conduct a flame test

A

dip a piece of platinum wire into hydrochloric acid
dip the wire into a sample of solid or solution
place the tip of the wire into Bunsen flame

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10
Q

red flame

A

lithium Li+

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11
Q

yellow flame

A

sodium Na+

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12
Q

lilac flame

A

potassium K+

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13
Q

orange/red flame

A

calcium Ca2+

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14
Q

blue/green flame

A

copper Cu2+

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15
Q

what is sodium hydroxide used to test for

A

Cu2+, Fe2+, Fe3+

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16
Q

how to conduct a sodium hydroxide test

A

dissolve the sample in water
add a few drops of NaOH

17
Q

blue precipitate (NaOH)

18
Q

green precipitate (NaOH)

19
Q

brown precipitate (NaOH)

20
Q

how does a sodium hydroxide test work

A

if one of the ions is present, a metal hydroxide precipitate forms

21
Q

how to conduct an ammonium test

A

dissolve the sample in water
add some NaOh and warm it
test the gas with damp red litmus paper
red to blue

22
Q

what are anions

A

negative ions

23
Q

what is the test for halide ins

A

silver nitrate test

24
Q

how to conduct the silver nitrate test

A

dissolve the sample in water
add nitric acid
add silver nitrate
if halide ions are present a precipitate forms

25
what does the silver nitrate test test for
Cl-, Br-, I-
26
white precipitate (AgNO3)
Cl-
27
cream precipitate (AgNO3)
Br-
28
yellow precipitate (AgNO3)
I-
29
how to test for carbonates
add hydrochloric acid, look for effervescence if there is effervescence, bubble through lime water turns limiter cloudy CO32-
29
how to test for carbonates
add hydrochloric acid, look for effervescence if there is effervescence, bubble through lime water turns limiter cloudy CO32-
30
how to test for sulfates
add hydrochloric acid, look for effervescence if there is no effervescence, add Barium Chloride solution white precipitate will form if sulfates are present
31
sulfates
So4 2-
32
carbonates
CO3 2-