B1 Moles, Formulae + Equations

Question 1

Charge of group 1 ions

Answer 1

1+

Question 2

Charge of group 2 ions

Answer 2

2+

Question 3

Charge of group 3 ions

Answer 3

3+

Question 4

Charge of group 5 ions

Answer 4

3-

Question 5

Charge of group 6 ions

Answer 5

2-

Question 6

Charge of group 7 ions

Answer 6

1-

Question 7

Formula and charge of nitrate

Answer 7

Question 8

Formula and charge of carbonate

Answer 8

Question 9

Formula and charge of sulfate

Answer 9

Question 10

Formula and charge of hydroxide

Answer 10

Question 11

Formula and charge of ammonium

Answer 11

Question 12

Formula and charge of zinc

Answer 12

Question 13

Formula and charge of silver

Answer 13

Question 14

How to write ionic equations

Answer 14

• Write balanced symbol equation
• Aqueous compounds split, solid remain unchanged
• Remove spectator ions
• Cancel down

Question 15

Define Mole

Answer 15

A unit containing 6.02 x10 (23) particles

Question 16

Define Avagadro’s constant

Answer 16

The number of particles per mole

Question 17

Equation for the mass of one atom, using avagadro’s constant

Answer 17

Question 18

Define Empirical Formula

Answer 18

The simplist whole number ratio of atoms of each element present in a compound

Question 19

Define Molecular Formula

Answer 19

The number and type of atoms of each element in a molecule

Question 20

Define Anyhdrous

Answer 20

A compound containing no waters of crystallisation

Question 21

Define Hydrated

Answer 21

A compound containing waters of crystallisation

Question 22

How to calculate the empirical formula of a compound/waters of crystallisation

Answer 22

• Calculate moles of each substance in the compound
• Find the simplest whole number ratio

Question 23

Moles equation, with mass

Answer 23

Question 24

Moles equation, with volume

Answer 24

Question 25

Moles equation, with concentration

Answer 25

Question 26

Moles equation, with concentration in grams/dm3

Answer 26

Question 27

Ideal Gas Equation

Answer 27

PV = nRT

Question 28

What must you always remember when solving a problem using the ideal gas equation

Answer 28

Re-arrange the equation as symbols before solving

Question 29

Unit of pressure for ideal gas equation, and how to convert from atmospheres

Answer 29

* Pascals * 1atm = x10(5) pa

Question 30

Unit for volume in ideal gas equation, and how to convert from other units

Answer 30

* meteres^3 * cm = x10(-6) * dm = x10(-3)

Question 31

n in ideal gas equation

Answer 31

Moles

Question 32

Unit for temperature in ideal gas equation, and how to convert

Answer 32

* Kelvin * Celcius to kelvin * +273

Question 33

Equation for pecentage yield

Answer 33

Question 34

Equation for atom economy

Answer 34

Question 35

Equation for percentage uncertainty

Answer 35

Question 36

When to multiply uncertainty by 2 when calculating percentage uncertainty

Answer 36

* Titres * Mass * Temperature

Question 37

What is the only gaseous alkali

Answer 37

Ammonia (NH3)

Question 38

Define an acid

Answer 38

Releases H+ ions in aqueous solutions

Question 39

Describe the difference between weak and strong acids

Answer 39

* Weak acids partially dissociate H+ ions in aqueous solutions * Strong acids partially dissociate H+ ions in aqueous solutions

Question 40

Define an alkali

Answer 40

Releases OH- in aqueous solutions

Question 41

Define a salt

Answer 41

The metal ion (X+) has replaced the H+ ion

Question 42

How many decimal places should be used in titre volumes

Answer 42

2dp

Question 43

Describe how to obtain a crystal sample

Answer 43

* Heat in evaporating basin until crystals start to form around outside * Leave to cool and crystallise * Filter to obtain solid crystals * Dry by dabbing with filter paper

Question 44

What are concordant results

Answer 44

Results within 0.1cm(^3) of each other

Question 45

Define Standard Solution

Answer 45

A solution of a known concentration

Question 46

Describe and explain how to prepare a standard solution

Answer 46

* Weigh mass of crystals in beaker on mass balance to 2dp * Dissolve in distilled water * Transfer to 250cm volumetric flask * Rinse beaker and transfer washings to volumetric flask * Make up to mark wtih more water, so bottom of meniscus is on mark * Use dropping pipette when filling to the mark * Put a stopper on top, and invert several times to mix