How Much?

Question 1

What is the relative atomic mass?2

Answer 1

The mass of the atoms of an element compared to Carbon-12

( which is given a mass of exactly 12)

Question 2

How are isotopes different from normal atoms?

Answer 2

• Because hey have a different number of neutrons the nucleus can be unstable
• And possibly radioactive
• Different density

Question 3

What is a polymer? 2

Answer 3

A substance made from very large molecules

Made up of repeating units

Question 4

What factors affect the properties of polymers?2

Answer 4

1 the monomers used to make them

2 the conditions chosen to carry out the reaction

Question 5

What is a thermosetting polymer?2

Answer 5

Will not soften

but will eventually char if heated very strongly

Question 6

What is a thermos offending polymer?

Answer 6

Will soften or melt easily when heated

Question 7

Definition of nano science?

Answer 7

The study of small particles between 1 to 100 nanometers in size

Question 8

What is an isotope?2

Answer 8

• Atoms of the same element with a different number of NEUTRONS
• but the same number of protons

Question 9

What does gas chromatography do to a mixture?

Answer 9

Separates the solvents

Question 10

Two advantages of gas chromatography compared with paper chromatography?2

Answer 10

• accurate

- quicker

Question 11

Why might a question not be able to be answered by science alone?3

Answer 11

• based on opinions
• ethical issue
• can’t be done by an experiment

Question 12

How does gas chromatography separate substances in a mixture of compounds?3

Answer 12

• substances carried by gas
• through a tube
• at different speeds

Question 13

Why do different compounds separate in a gas chromatography column?

Answer 13

Distances substances travel at different speeds

Question 14

Why use pencil in a chromatography column?

Answer 14

Ink would run and effect the results

Question 15

What determines the position on the ph scale?

Answer 15

Hydrogen

Question 16

Why might something not be able to be proven by science?

Answer 16

Based on opinion
Ethical social or economic issue
Cannot be done by experiment

Question 17

Why might a maximum yield not be obtained?

Answer 17

Reversible reaction
Escape to surroundings
Unexpected reactant

Question 18

With a solid, how do you get it from a mixture?

Answer 18

Filter

Question 19

What products do you get from sodium chloride solution?

Answer 19

Hydrogen
Sodium hydroxide
Chlorine

Question 20

How can you confirm the reliability of an experiment?

Answer 20

Compare to other results

Another scientist doing the same experiment

Question 21

why might it not be possible to obtain the calculated amount of product?

Answer 21

Reversible so reaction isn’t completed
Some product may be lost in deprecation
Reactants may react in a different way than expected

Question 22

Gas chromatography and mass spectrometry?

Answer 22

Time taken for a substance to travel through the column can be used to help identify the substance
Output from the gas chromatography column can be linked to a mass spectrometer which can be used to identify substances leaving end of column

Question 23

What does the number of peaks on the output of a gas chromatograph?

Answer 23

The number of compounds present

Question 24

What does the position of peaks on the output of a gas chromatograph?

Answer 24

Position of peaks indicates retention time

Question 25

Disadvantages of insure mental methods?

Answer 25

Very expensive

Takes special training to use

Question 26

MOLES EQUATION with mass moles and RFM

Answer 26

Mass/RFM

Question 27

MOLES EQUATION

Concentration and volume

Answer 27

Moles = concentration * volume