Unit 2

Question 1

What is titration used for?

Answer 1

We can use it to find the amount of something. It is quantitative

Question 2

What does titration involve?

Answer 2

the measurement of a known solution with a known concentration (titrant) is used to find the concentration of the unknown analyte

Question 3

What happens at the endpoint of a titration?

Answer 3

A colour change. Can use an indicator to make this happen

Question 4

What is a standard solution?

Answer 4

A solution whose concentration is known accurately

Question 5

How do you work out moles from conc and volume?

Answer 5

Conc X volume

Question 6

Moles triangle using conc?

Answer 6

Moles/

Conc X Vol (litres)

Question 7

Moles triangle

Answer 7

mass
#m X mm

Question 8

What is molarity?

Answer 8

Concentration. It’s the number of moles per litre of solution

Question 9

How do you find the concentration of a solution?

Answer 9

Moles/ volume in litres

Question 10

How do you convert cm and ml into dm³ ( dm³ is also litre)

Answer 10

divide by 1000

Question 11

What is dilution?

Answer 11

Preparing a less concentrated solution from a more concentrated one

Question 12

If you dilute a substance will you change the number of moles?

Answer 12

No just the concentration

Question 13

What is an acid

Answer 13

Proton donor

H+ ions

Question 14

what is a base?

Answer 14

Proton acceptor

OH-

Question 15

What happens when you add an acid to a base and what are the products?

Answer 15

Neutralisation happens and you will get water and a salt

Question 16

What is the unit for concentration?

Answer 16

Mol dm⁻³

Question 17

What is an ionic bond?

Answer 17

the transfer of electrons. The ions are then attracted to each other by electrostatic forces

Question 18

What is oxidation?

Answer 18

Loss of electrons

Question 19

What is reduction?

Answer 19

Gain of electrons

Question 20

What are oxidation numbers used for?

Answer 20

To keep track of electrons in a reaction. Its like the charges.

Question 21

What is the oxidation state of an atom in an element?

Answer 21

0

Question 22

What is the oxidation state of oxygen?

Answer 22

-2 (except when its 0₂⁻² this case its -1)

Question 23

What is the oxidation state of hydrogen?

Answer 23

+1

Question 24

What is the oxidation state of fluorine?

Answer 24

-1

Question 25

What is a reducing agent?

Answer 25

something that reduces something. It is oxidised itself

Question 26

In titrations you need to look at what to work out unknowns?

Answer 26

The ratio of reactants. So if you can work out the number of moles of one reactant and its a 1:1 ratio the unknown reactant will have the same

Question 27

How do you make half equations

Answer 27

Make two reactions splitting the oxidation and reduction halfs. You can balance them separately

Question 28

How do you calculate molarity?

Answer 28

Moles of solute/ Litres of solution

Question 29

Molarity triangle?

Answer 29

Moles of solute | Molarity X Vol (L)