Analysing And Identifying Substances

Answer 1

What is a pure substance?

Question 2

How does the word pure in chemistry differ from its everyday meaning?

Question 3

How can you tell the difference between a pure and an impure substance from its boiling point?

Question 4

How can a pure substance be identified on a boiling point graph?

Question 5

How can an impure substance be identified on a boiling point graph?

Question 6

What is a formulation?

Question 7

What are some examples of formulations?

Question 8

What is the relevance of each chemical in a formulation?

Question 9

What is the difference between a formulation and a polymer?

Question 10

What is paper chromatography used for?

Question 11

What is the purpose of chromatography?

Question 12

What mixtures are often separated using paper chromatography?

Question 13

What is the mobile phase?

Question 14

What is the stationary phase?

Question 15

Why do different dissolved substances move at different rates through the paper?

Question 16

What is a chromatogram?

Question 17

How can a chromatogram be used to distinguish between pure and impure substances?

(BLURT QUESTION)

Question 18

How can be a paper chromatogram be used to identify known substances?

Question 19

What are two indicators that a two substances are the same?

Question 20

Are spots of the same colour the same chemical?

Question 21

What is an Rf value?

Question 22

How can Rf values identify unknown chemicals?

Question 23

What is needed in order for Rf values to identify unknown chemicals?

Question 24

How do you calculate an Rf value?

Question 25

What two numbers do Rf values vary between?

Question 26

What does 1 tell you about a substance?

Question 27

What does 1 tell you about a substance?

Question 28

Are pure substances more likely to have higher or lower Rf values?

Question 29

What test is done for oxygen?

Question 30

What happens during the Glowing Splint test?

Question 31

What test is done for Hydrogen?

Question 32

What happens during the Squeaky Pop test?

Question 33

What test is done for Carbon Dioxide?

Question 34

What happens during the Limewater test?

Question 35

What test is done for Chlorine?

Question 36

What happens during the Damp Litmus Paper test?