EL and DF Definitions

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EL - Avagadro Constant
6.02 x10 23
1 of 23
EL - Empirical Formula
Simplest ratio of atoms of each element in a compound
2 of 23
EL - Molecular Formula
Actual ratio of atoms of each element in a compound
3 of 23
EL - Isotopes
Same atomic number (number of protons), but different mass numbers (number of neutrons)
4 of 23
EL - Half Life
Time taken for half the radioactive nuclei in a sample to decay
5 of 23
EL - Nuclear Fusion
Is the joining together of two or more nuclei to form a heavier nucleus of a new element
6 of 23
EL - Absorption Spectrum
Black lines on a coloured background
7 of 23
EL - Emission Spectrum
Coloured lines on a black background
8 of 23
EL - Periodicity
Regular pattern in a period
9 of 23
DF - Enthalpy Change of Combution
Enthalpy change when 1 mole of a substance is completely combusted in oxygen under standard conditions.
10 of 23
DF - Enthalpy Change of Formation
Enthalpy change when 1 mole of a substance is formed from it constituent elements in standard states and under standard conditions
11 of 23
DF - Entropy
Measure of the number of ways particles can be arranged
12 of 23
DF - Saturated
All single bonds
13 of 23
DF - Unsaturated
Contains 1 or more double bond
14 of 23
DF - Aliphatic
No benzene rings
15 of 23
DF - Arene/Aromatic
Contains a benzene ring
16 of 23
DF - Structural Isomers
Same molecular formula but different structural formulae
17 of 23
DF - Auto-ignition
Explosion of a fuel without a spark
18 of 23
DF - Octane Number
Measure of the tendancy of petrol to auto ignite
19 of 23
DF - Catalyst
Speeds up a reaction without being used itself
20 of 23
DF - Heterogenous Catalyst
Reactants are in a different state to catalyst
21 of 23
DF - What is made after cracking?
Branched Alkane and a Alkene
22 of 23
What is made after a substance has been reformed?
Cycloalkane and then arenes
23 of 23

Other cards in this set

Card 2

Front

Simplest ratio of atoms of each element in a compound

Back

EL - Empirical Formula

Card 3

Front

Actual ratio of atoms of each element in a compound

Back

Preview of the back of card 3

Card 4

Front

Same atomic number (number of protons), but different mass numbers (number of neutrons)

Back

Preview of the back of card 4

Card 5

Front

Time taken for half the radioactive nuclei in a sample to decay

Back

Preview of the back of card 5
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