Organic,inorganic And Halide Tests

Question 2

Whats the result of the test for an alkene

Answer 2

Bromine water go from orange to colourless

Question 3

Whats the test for an halogenoalkane

Answer 3

1. Add NaOH(aq) and warm
   2.acidify with HNO3
2. Add AgNO3(aq)

Question 4

Whats the result for the test for haloalkanes

Answer 4

A precipitate of AgX forms (colour depends on the halogen present)

Question 5

Test for alcohol (primary and secondary

Answer 5

Add acidified K2Cr2O7

Question 6

Result for test for alcohol

Answer 6

Orange colour of potassium dichromate turns green (only primary and secondary alcohols and with aldehydes)

Question 7

The 2 tests for aldehydes

Answer 7

Warm with Fehlings solution
Warm with Tollens solution

Question 8

Results for tests for aldehydes

Answer 8

Fehlings - blue turns to red precipitate
Tollens - silver mirror forms

Question 9

Test for carboxylic acids

Answer 9

Add NaHCO3 (aq)

Question 10

Result for test for carboxylic acids

Answer 10

CO2 given off

Question 11

Simple ways you can guess a compound or substance

Answer 11

Solid,liquid or gaseous
Is it acidic

Question 12

Simple test for polar groups

Answer 12

Does the compound dissolve in water

Question 13

Uses for mass spectrometry

Answer 13

Identifying relative atomic mass and relative molecular mass
Identification of organic molecules

Question 14

What’s a useful tool to identify organic molecules

Answer 14

Fragmentation

Question 15

Whats the test for an alkene

Answer 15

Bromine water

Question 16

How are organic molecules tested in mess spectrometry

Answer 16

Electro spray

Question 17

How is fragmentation useful

Answer 17

It can show us the rough composition of the molecule

Question 18

What type of mass spectrometry is really useful for identifying organic molecules

Answer 18

High resolution mass spectrometry

Question 19

Why is high resolution mass spectrometry useful

Answer 19

It uses real values for atoms so you get an exact mass from the molecule

Question 20

What is the first stage for time of flight mass spectrometry

Answer 20

Vacuum

Question 21

What is the second stage for time of flight mass spectrometry

Answer 21

Ionisation

Question 22

What is the third stage for time of flight mass spectrometry

Answer 22

Acceleration

Question 23

What is the fourth stage of time of flight mass spectrometry

Answer 23

Ion drift

Question 24

What is the fifth stage of time of flight mass spectrometry

Answer 24

Detection

Question 25

What is the sixth stage of time of flight mass spectrometry

Answer 25

Data analysis

Question 26

What is the use of low resolution mass spectrometry

Answer 26

Is is useful as it allows you to see the relative abundance of different isotopes

Question 27

How to find relative atomic mass from mess spectrum

Answer 27

( %(1) x mass(1) + %(2) x mass(2) )/100

Question 28

Why is vacuum useful

Answer 28

It prevent particles losing velocity due to resistance

Question 29

What happens in electro spray ionisation

Answer 29

The molecule is dissolved and then sprayed and the water evaporates leaving a proton

Question 30

What happens in electron gun ionisation

Answer 30

Electrons are shot at the atom and the electrons are repelled off the atom ionising it

Question 31

What happens in the acceleration stage

Answer 31

The ionised molecules and atoms will be attracted and repealed by charged plates and acceleration

Question 32

What happens in the ion drift stage of mass spectrometry

Answer 32

The accelerated ions accelerate down a clear path where the lower mass ions will fly faster than those with larger mass

Question 33

What happens in the detection stage

Answer 33

The ion collides with a charged plate and accepts an electron producing a current which is detected by the computer

Question 34

What happens in data analysis

Answer 34

The data from the detection plate if graphed and interpreted

Question 35

How does infrared spectroscopy work

Answer 35

IR Em waves are emitted towards the molecules and cause them to wiggle as they absorb certain frequencies

Question 36

How do you read a Ir spectroscopy graph

Answer 36

The peaks downwards are areas where frequencies are absorbed

Question 37

What value is used to show frequencies absorbed

Answer 37

Wave number Cm^-1

Question 38

What is the fingerprint region

Answer 38

A region where you can check against known molecules to test which one is which

Question 39

What is the way you can tell what a molecule is composed of

Answer 39

By comparing known value against dips in the graph

Question 40

Where is the fingerprint region

Answer 40

Anything below 1500 cm^-1

Question 41

What is the test for halides

Answer 41

Acidified silver nitrate

Question 42

Why can’t we use HCl instead of HNO3

Answer 42

HCl contains a chlorine and will give false results

Question 43

Why does the test have to be acidified

Answer 43

To remove OH^1- and CO3^2-

Question 44

What is the flour precipitate for flouride ions

Answer 44

No precipitate

Question 45

What colour is the precipitate for Chloride ions

Answer 45

White ppt

Question 46

What colour is the precipitate for bromide ions

Answer 46

Cream ppt

Question 47

What colour is the precipitate for iodide

Answer 47

Pale yellow ppt

Question 48

What’s the test to make sure the precipitate is silver chloride

Answer 48

Dissolves in dilute ammonia

Question 49

What test makes sure the precipitate is silver bromide

Answer 49

Dissolves in concentrated ammonia

Question 50

What test is used to make sure the precipitate is silver iodide

Answer 50

Does not dissolve in concentrated ammonia

Question 51

What is in the ionisation stage

Answer 51

The particles are ionised either through electro spray or electron impact