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atomic number
number of protons in an atom
1 of 36
ion
particle where number of electrons doesn't equal number of protons
2 of 36
isotopes
atoms having same number of protons but different number of neutrons
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mass number
number of protons + neutrons
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2 protons and 2 neutrons positively charged
alpha particles
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fast moving electrons negatively chaged
beta particles
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atomic orbital
an atom can hold up to 2 electrons with opposite spins
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electronic configuration
arrangement of electrons in an atom
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electron shielding
repulsion between electrons in different shells. inner repel outer
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molar first ionisation of energy in an element
energy required to remove one mole of electrons from one mole of its gaseous atoms
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one mole
amount of substance containing the same number of particles as there are atoms in exactly 12g of carbon-12
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relative atomic mass
average mass of one atom relative to one-twelfth the mass of carbon-12
12 of 36
relative isotopic mass
mass of an atom of an isotope relative to one-twelfth the mass of carbon-12
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relative molecular mass
average mass of a molecule to one twelfth the mass of a atom of carbon-12
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atom economy
mass of required product/total mass of reactants x 100
15 of 36
percentage yield
mass of product obtained/maximum mass x 100
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dynamic equillibrium
when the forward and reverse reactions occur at the same rate
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Le Chatelier's Principle
an equilibrium is equal to change, the equilibrium will shift to minimise the change
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an acid
a proton (H+) donor
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a base
a proton (H+) acceptor
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enthalpy
heat content of a sytems
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enthalpy change
heat added to a system at constant pressure
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standard enthalpy change of formation
enthalpy change when 1 mole is formed from its own elements in standard states
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standard enthalpy change of combustion
enthalpy change when 1 mole is combusted in oxygen under standard conditions
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hess' law
the total enthalpy change for a reaction independent of the route taken from the reactants to the products
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average bond enthalpy
average value of enthalpy required to break a covalent bond in (gaseous species)
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bond enthalpy
enthalpy required to break a covalent X-Y bond into X atoms and Y atoms (gaseous)
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rate of reaction
change in concentration of a reactant or product per time
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activation energy
minimum energy required to start a reaction by breaking bonds
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an enzyme
a biological caalystt
30 of 36
what is acidic pH
1-6-(red)
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what is alkali pH
8-14-(purple)
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what is neutral pH
7 (green)
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mole equation
n=m/Mr
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concentration equation
n=cxv
35 of 36
molar volume equation
n=v/Vm
36 of 36

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Card 2

Front

ion

Back

particle where number of electrons doesn't equal number of protons

Card 3

Front

isotopes

Back

Preview of the front of card 3

Card 4

Front

mass number

Back

Preview of the front of card 4

Card 5

Front

2 protons and 2 neutrons positively charged

Back

Preview of the front of card 5
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