stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
Revise Chemical Analysis Flashcards | StudBud
Explore
/
Revise Chemical Analysis
Revise Chemical Analysis
26 terms
·
StudBud Administration
·
66 plays
Imported from external platform
Flashcards
26 cards
F
Practice quiz
P
Host live
L
Questions
26
Answers
1
In chromatography, what is the R
f
value?
distance travelled by the solvent /distance of spot
Distance travelled by the spot
distance of spot / distance travelled by solvent
distance travelled by the solvent
2
What is the test for the presence of OXYGEN gas?
glowing splint test
Pop test
cough test
smell test
3
The Rf value is always ...
Unique
0.5
Less than 1
More than 1
4
In chromatography, which of these would not cause an error?
having the solvent higher than the start line
allowing the solvent front to reach the top of the paper
drawing the start line in pen
placing a lid on the beaker
5
Chromatography is.....
Separating pigments of dyes
Separating pigments of ink
∞
Creating a map
6
Chromatography can be used to
separate two solvents
boil away solvents
separate solutes in a solution
mix together solvents and solutes
7
What's the test for carbon dioxide???
relights a glowing splint
Turns limewater milky
Extinguishes a splint
squeaky pop
8
What is a formulation?
It is made up of just one type of element or compound.
A mixture that has been designed to make a useful product.
A mixture that isn't very useful and needs purifying.
It is made up of more than one type of element or compound.
9
Which of these terms is not used in chromatography?
Fractionating column
solvent front
mobile phase
Rf value
10
Name some mixtures that are suitable for chromatography?
Metal
Ink
Gas
Fish food
11
Paint is a formulation containing..
Dye and Oil
Pigment and Oil
Solution, Binder, Dye
Pigment, Binder, Solvent
12
What is the Rf value of the blue spot?
40
6
0.4
4
13
Other examples of formulations are..
All of them
Washing up liquid
Cosmetics
Fertilisers
14
What is the test for the presence of HYDROGEN GAS?
Pop test
burning splint
smell test
cough test
15
What do you draw the line in on the chromatography paper
chalk
Pencil
highlighter
pen
16
The boiling point of pure water in Celsius is ___________.
Really Hot!
0 Degrees
100 Degrees
212 Degrees F
17
how can you calculate the Rf value?
distance moved by compound ÷ distance moved by solvent
distance moved by compound × distance moved by solvent
distance moved by solvent - distance moved by compound
distance moved by solvent ÷ distance moved by compound
18
Mineral Water is an example of something pure.
True
False
19
Calculate the Rf value for the purple spot
0.2
0.8
0.6
1.7
20
What calculation would you do to find the Rf value of the compound?
4.0 ÷ 5.5
5.5 ÷ 4.0
5.5 X 4.0
4.0 X 5.5
21
How do we test for Chlorine?
Turns Damp blue litmus paper red than white.
Turns damp blue litmus paper red than green
Turns red litmus paper blue than yellow
Turns damp red litmus paper blue than purple
22
How is the Rf value useful?
Show how pigments work.
To identify pigments.
To quantify amounts .
23
In chromatography, in which phase can the substance move?
Stationary phase
Mobile phase
24
What is a pure substance?
One single substance (either an element or a compound).
One single element.
One single compound.
One or more elements chemically joined together.
25
A white powder was analysed and found to melt from 158C - 163C - what does that tell you about the powder?
It is a compound.
It doesn't tell you anything.
It is pure.
It is a mixture.
26
What is Pure Water?
Element
Mixture
Compound
