Chemistry

Question 1

name the mass and charge of each atomic particle

Answer 1

proton (mass=1 charge=+1) neutron (mass=1 charge=0) electron (mass=0 charge=-1)

Question 2

define an isotope

Answer 2

Atoms of the same element and same atomic number with different numbers of neutrons and different mass number

Question 3

define relative molecular mass

Answer 3

total mass of all the atoms in the ionic formula

Question 4

how to work out moles

Answer 4

mass/Ar or Mr

Question 5

what is concentration measured in

Answer 5

g/dm^3 or mol/dm^3

Question 6

how to calculate the number of moles in a solution

Answer 6

concentration (mol.dm^-3) X volume (cm^3)

Question 7

how to calculate the volume

Answer 7

volume (dm^3)=24 X moles

Question 8

how do you measure atomic radius

Answer 8

measure the distance between two nuclei and divide by two

Question 9

what happens to atomic radius across a period

Answer 9

decreases

Question 10

what happens to atomic radius as you go down a group

Answer 10

increases

Question 11

what is ionisation energy

Answer 11

electrons being removed from atoms and the energy it takes to remove them can be measured. Atoms become positive ions.

Question 12

what does the ionisation energy of an element depend on

Answer 12

atomic radius nuclear charge (number of protons) number of electron shells

Question 13

what is a molecular formular

Answer 13

refers specifically to a covalently bonded molecule and shows the number of atoms of each element in molecules of a particular compound

Question 14

what is a empirical formula

Answer 14

refers to ionic or covalent compounds and is the simplest ratio of atoms of different elements in a compound

Question 15

how do you work out the volume in an ideal gas equation

Answer 15

v= nRT/P

Question 16

how do you work out the number of moles n of a gas in an ideal gas equation

Answer 16

n=PV/RT

Question 17

Structure of diamond

Answer 17

• Tetrahedral structure
• Each carbon is bonded to 4 other carbons
• Carbons are covalently bonded

Question 18

properties of diamond

Answer 18

• very hugh melting point (2000°C)
• no charged oarticles, does not conduct electricty
• dosen’t dissolve in any olvent

Question 19

structure of giant covalent:graphit

Answer 19

• hexagonal arrangment of carbons
• each carbon bonds to 3 other carbons
• covalent bond
• forms layer

Question 20

structure of graphene

Answer 20

• single layer of graphite
• giant covalent lattice, high melting and boiling point
• dosen’t dissolve in any solvent
• conduct electricty, delocalised electrons
• transparent, extremely thin

Question 21

properties of graphite

Answer 21

• high melting point
• does not dissolve in any solvent
• soft and sippery
• conduct electricty

Question 22

structure of fullerenes

Answer 22

• 60 carbon atoms joined together to form a ball
• giant lattice, high melting and boling point, insoluble
• conducts electricty

Question 23

properties of ilicion dioxide

Answer 23

• lagre number of strong covalent bonds
• high melting and boiling point
• had crystaline structure
• cannot conduct electricty

Question 24

Metal atoms …. outer ecltrons and become …..

Answer 24

• loose
• positive

Question 25

Free elctrons are called

Question 26

What are the properties of metallic bonding?

Answer 26

• High melting points
• Hard and strong
• Solid at room temperature
• Conduct elctricty and heat