Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemisty > Chemical Analysis > Flashcards

Chemical Analysis Flashcards

1
Q

What are the melting points like in pure substances

A

Narrow. High melting and low boiling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the melting and boiling pints like it impure substances

A

Wide range. Higher boiling points and lower melting points

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a formulation

A

A mixture that’s has been designed as a useful chemical product in which each chemical has a particular purpose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How do you test for hydrogen

A

Use a lit spilt held at the open end at the test tube. There will be a popping sound

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How do you test for oxygen

A

Use a glowing splint. It will relight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How do you test for Carbon dioxide

A

Use limewater (calcium hydroxide). The limewater will turn milky (cloudy)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How to test for chlorine

A

Use litmus paper. It will turn white

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Why is chromatography used

A

To identify unknown substances as the compounds will separate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

In chromatography what is it meant by low value

A

Not very soluble

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

In chromatography what is it meant by high value

A

Very soluble

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

In chromatography what is it meant by mobile

A

The parts that travel such as the solvent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

In chromatography what is it meant by stationary

A

The parts that don’t move such as the paper

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How do you calculate the retention factor

A

Distance the spot moved/distance solvent moved

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What things must you remember to do when setting up chromatography

A

Keep the solvent under the base line

Draw the base line in pencil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the precipitate for aluminium

A

White

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the precipitate for calcium

A

White

17
Q

What is the precipitate for magnesium

A

White

18
Q

What is the precipitate for copper (III)

A

Blue

19
Q

What is the precipitate for iron (II)

A

Green

20
Q

What is the precipitate for iron (III)

A

Brown

21
Q

In a flame test what colour is lithium

A

Crimson (red)

22
Q

In a flame test what colour is sodium

A

Yellow

23
Q

In a flame test what colour is potassium

A

Lilac

24
Q

In a flame test what colour is calcium

A

Orange-red

25
Q

In a flame test what colour is copper

A

Green

26
Q

What is the method for flame test for cations

A

Wore loop dipped in hydrochloric acid. Placed in flame. Placed in acid. Dip in metal being tested. Hold in the blue flame.

27
Q

What is the metal action test

A

Add sodium hydroxide to metal cation solution. Note colour

28
Q

What is a potential problem with flame tests

A

Some of the elements are the smae colour so the result is not a definite answer

29
Q

How do you test for carbonates

A

Add dilute acid to the carbonate. If it fizzes and produces carbon dioxide collect it. Test for unknown substances. Carbon dioxide will turn it cloudy

30
Q

How do you test for sulfates

A

Add dilute hydrochloric acid. Add barium chloride. White precipitate if sulfate ions present

31
Q

How do you test for halides

A

Add dilute nitric acid. Add silver nitrate. Observe precipitate.

32
Q

What colour precipitate is iodide

A

Yellow

33
Q

What colour precipitate is bromide

A

Cream

34
Q

What colour precipitate is chloride

A

White

35
Q

What happens to electrons when energy is added

A

They absorb the energy and go into the excited phase. Moving to different shells

36
Q

What happens after the excited phase from the electrons

A

Energy is emitted

37
Q

What is flame emission spectroscopy used for

A

Analyses metal ions in solutions

38
Q

Why cannot flame tests be used for two metal ions

A

The flame gives out one colour there may be other elements that are masked by others

39
Q

Describe the spectroscope

A

Distinct spectral lines corresponding to the wavelength emitted

Chemisty (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions