Chem 2

Question 1

First ionisation energy

Answer 1

The energy required to remove one electron from each atom in one mole of gassiest atoms of an element to form one mole of gassiest 1+ ions

Question 2

Metallic bonding

Answer 2

Strong electrostatic attraction between cat ions and delocalised electrons

Question 3

Disproportionation

Answer 3

Redox reaction where the same element as both oxidised and reduced

Question 4

Chlorine and sodium hydroxide

Answer 4

Sodium chlorate sodium chloride and water

Question 5

Solubility of halogens

Answer 5

Iodine insoluble in concentrated ammonia bromide soluble and concentrate on ammonia chlorine soluble and die loot ammonia

Question 6

Test for carbonate

Answer 6

React with acid to form carbon dioxide use nitric acid then bubble through limewater solution of calcium hydroxide carbon dioxide reacts to form calcium carbonate a white precipitate turning limewater milky

Question 7

Test for sulphate

Answer 7

Barium sulphate is insoluble add a previous Barium nitrate to solution if sulfate present white precipitate will phone

Question 8

Test the halogens

Answer 8

Add silver nitrate form precipitate then add ammonia to test solubility

Question 9

Test from Ammonium ions

Answer 9

Add aqueous hydroxide ions such as sodium hydroxide to a solution of ammonium irons ammonia gas is produced soluble in water will turn litmus paper blue

Question 10

Activation energy

Answer 10

The minimum energy required from reactions take place

Question 11

Standard conditions

Answer 11

100 KP a
298K
One moledm^3
Standard state physical state of substances under standard conditions

Question 12

Standard enthalpy change of reaction

Answer 12

The enthalpy change that accompanies a reaction in the more the quantities shown in a chemical equation in standard conditions with all reactants and products in standard states

Question 13

Enthalpy change of formation

Answer 13

Enthalpy change that takes place when one mole of a compound is formed from its elements understand the conditions with all reactants and products in a standard states

Question 14

Enthalpy change of combustion

Answer 14

The entropy change that takes place when one mole of a substance reacts completely with oxygen understand it conditions with all reactants and products in their standard states forms CO2 and H2O

Question 15

Enthalpy change of neutralisation

Answer 15

The energy change that the company is a reaction of an acid with a base to form one mole of H2O understand the conditions

Question 16

Specific heat capacity

Answer 16

The energy required to raise the temperature of 1 g substance by 1K

Question 17

Average bond enthalpy

Answer 17

The energy required to break one mole of specify type of bond in a gaseous molecule

Question 18

Lattice enthalpy

Answer 18

A measure of the strength of ionic bonding in a giant ionic lattice accompanies the formation of one mole of an ionic compound from its gases ions understand and conditions

Question 19

Standard enthalpy change of atomisation

Answer 19

The energy change that takes place in the formation of one mole of gassiest atoms from the element in at standard state understand and conditions always endothermic

Question 20

First ionisation energy

Answer 20

The energy change required to remove one electron from each atom in one mole of gassiest atoms to form one mole of gassiest 1+ ions endothermic

Question 21

Electron affinity

Answer 21

The energy change that takes place when one electron is added to each atom in one mole of gassiest atoms to form one mole of gassiest one minus ions

Question 22

Enthalpy change of solution

Answer 22

The enthalpy change that takes place when one mole of a solid solid dissolves in a solvent if the solvent is water the ions from the ionic lattice finish up surrounded by water molecules as aqueous ions

Question 23

Enthalpy change of hydration

Answer 23

When separate gassiest ions interact with the polo water molecules to form hydrated aqueous ions

Question 24

Which elements form giant covalent structures

Answer 24

Carbon silicon and boron

Question 25

Giant covalent lattice

Answer 25

Billions of atoms held together by network a strong covalent bonds

Question 26

Electron pair repulsing theory

Answer 26

A model used in chemistry to explain and predict the shape of molecules and polyatomic ion is

Question 27

Intermolecular forces

Answer 27

Week interactions between dipole of different molecules