Definitions!

All the definitions you need for the exam.

I'll add them as I learn them, put any others you need to learn in the comments and I'll update this.

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  • Created by: Alexa997
  • Created on: 09-10-13 14:55
Empirical Formula
The simplest whole number ratio of atomsof each element in a compound.
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Stoichiometry
Describes the simple whole number ratios in which chemicals react with each other (basically a balanced equation).
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Relative Atomic Mass
Average mass of an atom divided by 1/12 of the mass of a carbon-12 atom.
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Avogadro's Number
The number of particles in a mole of substance (6.022 * 10^23, or 60220000000000000000000).
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Mole
A quantity of substance contains the Avogadro Number of particles.
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Molecular Formula
A formula that tells us the numbers of atoms of each element in a compound.
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Relative Atomic Mass
Average mass of an atom divided by 1/12 of the mass of a carbon- 12 atom.
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Proton Number
The number of protons in the nucleus of an atom, the same as its atomic number.
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Relative Formula Mass
Average mass of an entity divided by 1/12 of the mass of a carbon- 12 atom.
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Relative Molecular Mass
Average mass of a molecule divided by 1/12 of the mass of a carbon- 12 atom.
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Van der Waals Forces
The weakest type of intermolecular force, caused by instantanous dipoles. Works between all atoms and molecules.
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Strong Nulcear Force
The force that holds protons and neutrons together within the nucleus of the atom.
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Nucleons
Sub atoic particles that reside in the nucleus - protons and neutrons.
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Electrostatic Forces
The forces of attraction and repulsion between electrically charged particles.
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Electronegativity
The power of an atom to attract the electrons in a covalent bond.
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Hydrogen Bonding
The strongest type of intermolecular force in which a hydrogen atom covalently bonded to an electronegative atom interacts with another electronegative atom (Oxygen, Flourine and Nitrogen).
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Dipole - Dipole Force
An intermolecular force that results from the attraction between molecules with permanent dipoles.
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Delocalised
Describes electrons that are spread over several atoms to help bond them together.
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Lone Pair
A pair of electrons in the outer shell of an atom that is not involved in bonding, also called an unshared pair.
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Other cards in this set

Card 2

Front

Stoichiometry

Back

Describes the simple whole number ratios in which chemicals react with each other (basically a balanced equation).

Card 3

Front

Relative Atomic Mass

Back

Preview of the front of card 3

Card 4

Front

Avogadro's Number

Back

Preview of the front of card 4

Card 5

Front

Mole

Back

Preview of the front of card 5
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