Chemistry AS Definitions

HideShow resource information
  • Created by: Safaxo
  • Created on: 13-05-18 22:15
Atomic number
The number of PROTONS in an atom
1 of 35
Mass number
The number of PROTONS and NEUTRONS in an atom
2 of 35
Isotopes
Atoms with the same number of protons but a different number of neutrons
3 of 35
Relative atomic mass (Ar)
The AVERAGE mass of one atom of an ELEMENT in comparison to the mass of one atom of C12 taken as 12.000
4 of 35
Orbital
A region in space around the nucleus where the PROBABILITY of finding an ELECTRON is MAXIMUM
5 of 35
Ionisation energy
The energy REQUIRED to remove an electron from each atom in ONE MOLE of GASEOUS atoms to form one mole of GASEOUS IONS
6 of 35
Successive ionisation energies
Energies required to remove 2nd, 3rd and 4th electrons
7 of 35
Mr
The AVERAGE mass of one MOLECULE relative to the mass of one C12 atom taken as 12.000
8 of 35
Fr
The AVERAGE mass of one FORMULA UNIT relative to the mass of one C12 atom taken as 12.000
9 of 35
Mole
The amount of substance that contains 6.022 x 10^23 particles
10 of 35
Molar mass
The mass of ONE MOLE of substance in GRAMS
11 of 35
Empirical formula
Formula that shows the SIMPLEST WHOLE NUMBER RATIO of elements in the molecule of a compound
12 of 35
Molecular formula
Formula that shows the ACTUAL RATIO of the elements in one molecule of the compound
13 of 35
Strength of a solution
AMOUNT of SOLUTE (g) dissolved in 1dm3 of solution
14 of 35
Concentration of solution
Number of MOLES (n) of solute dissolves in 1dm3 of solution
15 of 35
Element
Made up of only ONE type of atom
16 of 35
Atom
Smallest part of an element
17 of 35
Compound
One type of molecule combine CHEMICALLY in a FIXED RATIO
18 of 35
Ionic bond
The electrostatic forces of attraction between two oppositely charged IONS in a LATTICE
19 of 35
Covalent bond
SHARED pair of electrons between two NON-METALS to complete their octets
20 of 35
Co-ordinate bond
Is a covalent bond with BOTH ELECTRONS supplied by the SAME ATOM
21 of 35
Metallic bonding
Metals consist of a LATTICE of positive ions existing in a sea of DELOCALISED ELECTRONS which are attracted by electrostatic FOA
22 of 35
Electronegativity
The power of an atom to attract the electron density in a covalent bond towards itself
23 of 35
Latent heat of fusion
Heating a SOLID (breaks forces)
24 of 35
Latent heat of vaporisation
Heating a LIQUID (breaks forces)
25 of 35
Exothermic
Energy is RELEASED
26 of 35
Endothermic
Energy is ABSORBED
27 of 35
Enthalpy change
Heat change at a CONSTANT PRESSURE in a chemical process
28 of 35
Enthalpy change of FORMATION
The change when 1 MOLE of substances is formed from its elements in their STANDARD STATES, under STANDARD CONDITIONS
29 of 35
Enthalpy change of COMBUSTION
The heat change when 1 MOLE of a substance in it's STANDARD STATE is burned completely in EXCESS O2 under STANDARD CONDITIONS
30 of 35
Enthalpy change of NEUTRALISATION
The heat change when 1 MOLE of WATER is formed by complete neutralisation of an acid with an alkali under STANDARD CONDITIONS in their STANDARD STATES
31 of 35
Enthalpy change of DISPLACEMENT
The heat change when 1 MOLE of a metal displaces another metal from the AQEOUS SOLUTION of it's sale under STANDARD CONDITIONS, all substances in their STANDARD STATES
32 of 35
Specific heat capacity
Amount of energy needed to raise the temperature of 1g of a substance by 1K
33 of 35
Hess's law
The total enthalpy change of a reaction is INDEPENDENT OF THE REACTION ROUTE
34 of 35
Bond enthalpy
Energy REQUIRED to BREAK 1 MOLE of a COVALENT BOND in GASEOUS state under STANDARD CONDITIONS
35 of 35

Other cards in this set

Card 2

Front

The number of PROTONS and NEUTRONS in an atom

Back

Mass number

Card 3

Front

Atoms with the same number of protons but a different number of neutrons

Back

Preview of the back of card 3

Card 4

Front

The AVERAGE mass of one atom of an ELEMENT in comparison to the mass of one atom of C12 taken as 12.000

Back

Preview of the back of card 4

Card 5

Front

A region in space around the nucleus where the PROBABILITY of finding an ELECTRON is MAXIMUM

Back

Preview of the back of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Definitions resources »