Prep For January Mock

Question 1

Moles equation

Answer 1

Moles = mass x Mr

Question 2

Molar mass equation / number of particles

Answer 2

Amount of substance=number of particles/ molar mass

Question 3

Amount of substance equation

Answer 3

Amount of substance= number of particles/ Avogadro’s number

Question 4

Anhydrous mass equation

Answer 4

Moles=anhydrous mass/ Mr

Question 5

Concentration equation

Answer 5

Conc (moldm-3) = moles/ volume (dm3)

Question 6

Ammonia

Answer 6

NH3

Question 7

Ammonium

Answer 7

NH4+

Question 8

Sulphate

Answer 8

SO4 2-

Question 9

Nitrate

Answer 9

NO3-

Question 10

Carbonate

Answer 10

Co3 2-

Question 11

Hydroxide

Answer 11

OH-

Question 12

Methane

Answer 12

CH4

Question 13

Sulphuric acid

Answer 13

H2SO4

Question 14

Nitric acid

Answer 14

HNO3

Question 15

Ionic bonding

Answer 15

Between metals and no metals

Question 16

Covalent bonding

Answer 16

Between non metals

Question 17

What are the types of intermolecular forces

Answer 17

Induced dipole dipole
Permanent dipole dipole
Hydrogen bonds

Question 18

What bonds are hydrogen bonds

Answer 18

H-F
H-O
H-N

Question 19

What happens to the the ie when you move across a period and why?

Answer 19

The Ie decreases because the atomic radium decreases, the no of shells stays the same but the nuclear attraction increases meaning the electrons require more energy to remove

Question 20

What happens to the or when you move down a period?

Answer 20

The ie decreases because the atomic radius increases, electrons are less attracted to the nucleus and there is less shielding

Question 21

How do you get from cm3 to dm3

Answer 21

Divide by 1000

Question 22

How do you work out the concentration after being diluted?

Answer 22

Concentration after dilution= moles/new volume

Question 23

What is an acid?

Answer 23

A compound that releases protons in an aqueous solution ( proton donor)

Question 24

What is a base

Answer 24

A proton acceptor

Question 25

What is an alkali

Answer 25

Alkalis release OH- ions in an aqueous solution

Question 26

What is a salt

Answer 26

A compound formed when the h+ ion from an acid is replaced by a metal ion or ammonium ion

Question 27

What are the steps to an ionic equation?

Answer 27

Write normal equation Write again but with all the ions seperate If any ions appear the same on both sides cancel them out