Rev

Question 1

What are the group 7 elements called and how is there reactivity altered as they go down the group?

Answer 1

Halogens

Reactivity decreases as you go down the group

Question 2

What are the group 1 elements called and how is there reactivity altered as they go down the group?

Answer 2

Alkali metals

Reactivity increases as you go down the group

Question 3

What is the equation for the number of atoms/ molecules?

Answer 3

Moles x 6.02x 10^23

Question 4

What is the equation for the mass of one atom?

Answer 4

Mass number
_______________

6.02x 10^23

Question 5

In electrolysis, what is the negative and positive electrodes called?

Answer 5

Negative- Cathode

Positive- Anode

Question 6

What is the equation for Rf value in chromatography?

Answer 6

Distance travelled by sample
_______________________________

Distance travelled by solvent

Question 7

What is chromatography?

Answer 7

Chromatography is a method used to separate and identify the substance in a mixture. There is 2 phases;

A mobile phase- The molecules can move. Always a liquid or gas

Question 8

What is the mobile phase and stationary phase in chromatography?

Answer 8

Mobile phase = solvent

Stationary phase = paper