Random 2

Question 1

Two properties of simple molecular substances

Answer 1

•Low melting and boiling points
•Don’t conduct electricity only-no charged particles to carry charge.

Question 2

What’s a polymer?

Answer 2

Very long chain of repeating units

Question 3

What are polymers usually solid at ? (Temperature)

Answer 3

Room temperature

Question 4

Why are polymers typically solid at room temperatures?

Answer 4

Because they have relatively strong intermolecular forces

Question 6

What are giant covalent structures?

Answer 6

Solids containing atoms which are all bonded to each other by strong covenant bonds

Question 7

What kind of melting and boiling point do giant covalent structures have?

Answer 7

High melting and boiling

Question 8

Do giant covalent structures conduct electricity?

Answer 8

No -no charged particles to carry charge

Question 9

What are the 3 Allotropes?

Answer 9

Diamond, Graphite and Graphene

Question 10

What are the melting points of the 3 Allotropes?

Answer 10

High

Question 11

What are the properties and conductivity of the Allotrope: Diamond

Answer 11

•Very hard
•Doesn’t conduct

Question 12

What are the properties and conductivity of the Allotrope: Graphite

Answer 12

•Soft slippery
•Conducts electricity and thermal energy

Question 13

What are the Bonding, properties and conductivity of the Allotrope: Graphene

Answer 13

•Strong, light
•Conducts electricity

Question 14

Why can Graphite and Graphene conduct electricity but not Diamond?

Answer 14

Each carbon atom in them has one delocalised electron

Question 15

What do Fullerenes have?

Answer 15

Hollow shapes- rings of 6 or 7 carbon atoms

Question 16

What are nanotubes?

Answer 16

Cylindrical fullerenes used in nano technology

Question 17

What is metallic bonding between?

Answer 17

Metal atoms and delocalised (outer shell) electrons

Question 18

4 properties of metals:

Answer 18

•High melting and boiling points
•Good thermal conductors
•Good electrical conductors
•Soft and malleable

Question 19

What are Alloys a mixture of?

Answer 19

Metal and at least one other element

Question 20

Are alloys harder or softer than pure metals?

Answer 20

Harder

Question 21

What kind of particle arrangement does a solid have?

Answer 21

Fixed position

Question 22

Change of state from gas to liquid?

Answer 22

Condensing

Question 23

Change of state from solid to liquid?

Answer 23

Melting

Question 24

When a substance heats up and particles gain energy, what happens to the forces?

Answer 24

Weaken

Question 25

What is the relative formula mass?

Answer 25

Sum of all the relative atomic masses

Question 26

How to work out Percentage mass of an element in a compound ?

Answer 26

Ar x number of atoms in an element / Mr of the compound ) x100

Question 27

What is one mole / Avogadro constant?

Answer 27

6.02 x 10^23

Question 28

In the equation linking Mass, Mr and moles, which is on top?

Answer 28

Mass

Question 29

What is the conservation of mass?

Answer 29

No atoms are created or destroyed in a chemical reaction, so the total masses of reactants and products are the same.

Question 30

How might mass decrease in a reaction?

Answer 30

Gas made during the reaction may escape

Question 31

How might mass increase in a reaction?

Answer 31

A gas from the air acts as a reactant

Question 32

How to work out concentration?

Answer 32

Mass of solute / volume of solvent

Question 33

What is a limiting reactant?

Answer 33

Reactant that gets completely used up in a reaction (so limits the amount of product formed)

Question 34

Two ways pH can be measured?

Answer 34

•Universal indicator •pH probe

Question 35

What are the pros of a universal indicator?

Answer 35

Gives a wide range indicator

Question 36

What is the pros of a pH probe?

Answer 36

Gives an accurate value of the pH

Question 37

What colour and number is most acidic?

Answer 37

Red 1pH

Question 38

What is a neutralisation reaction?

Answer 38

Acid + base > salt + water

Question 39

Definition of a strong acid?

Answer 39

Acid that completely ionises in water

Question 40

Definition of weak acid

Answer 40

Acid that partially ionises in water

Question 41

What is acid Strength a measure of?

Answer 41

Proportion of acid molecules that ionise in water

Question 42

What is acid concerning a measure of?

Answer 42

The number of acid molecules in a certain volume of water

Question 43

Do dilute acids have high or low concentration?

Answer 43

Low

Question 44

What is more reactive, Hydrogen or carbon?

Answer 44

Carbon

Question 45

What is more reactive, Calcium or Zinc?

Answer 45

Zinc

Question 46

What is a displacement reaction?

Answer 46

When a more powerful reactive element displaces a less reactive metal

Question 47

What’s OILRIG

Answer 47

Oxidation is loss (of electrons) Reduction is gain (of electrons)

Question 48

What is a redox reaction?

Answer 48

Where one substance in a reaction is reduced and another is oxidised

Question 49

What is endothermic?

Answer 49

Takings in energy more from surroundings than it takes out (shown by a fall in temperature)

Question 50

What is made by adding metals or insoluble metal compounds to acids.

Answer 50

Soluable salts