Chemistry Key Definitions
Quizsearch to help learn your definitions for AS Chemistry (OCR)
3.0 / 5 based on 2 ratings
- Created by: Sophie
- Created on: 25-11-12 14:58
A substance that cannot be broken down into anything simpler
Element
1 of 45
The smallest possible component in an element
Atom
2 of 45
A substance composed of two or more elements, chemically bonded together
Compound
3 of 45
An arrangement of atoms covalently bonded together
Molecule
4 of 45
A shared pair of electrons holding atoms together in a molecule
Convalent
5 of 45
Particle formed from an atom or group of atoms by loss or gain of electrons with, respectively, a positive or negative charge
Ion
6 of 45
Electrostatic attraction between oppositely charged ions
Ionic bonds
7 of 45
The number of protons in one atom of an element
Atomic number
8 of 45
Atoms of the same element with different numbers of neutrons
Isotopes
9 of 45
A region of space that can hold up to 2 electrons with opposite spins
Orbital
10 of 45
The energy needed to remove one electron from each atom in mole of gaseous atoms of an element
First ionisation energy
11 of 45
The mass of an atom of an isotope on a scale where the mass of an atom of 12C is exactly 12
Relative isotopic mass
12 of 45
The average mass of an atom of an element on a scale where the mass of an atom of 12C is exactly 12
Relative atomic mass (Ar)
13 of 45
The average mass of a molecule of a substance on a scale were the mass of an atom of 12C is exactly 12
Relative molecular mass (Mr)
14 of 45
The average mass of a formula unit of a substance on a scale where the mass of an atom of 12C is exactly 12
Relative formula mass (Mr)
15 of 45
The amount of a substance that contains the same number of particles as there are atoms in exactly 12g of 12C.
Mole
16 of 45
The mass (in g) of 1 mole of a substance. The units are g mol-1
Molar mass
17 of 45
The proportion in which substances react in a chemical reaction
Stoichiometry
18 of 45
Shows the number of atoms of each element in one molecule of the substance
Molecular formula
19 of 45
Shows the simplest whole number ratio of atoms of each element present in a substance
Empirical formula
20 of 45
The attraction of a shared pair of elections for the nuclei of two atoms
Covalent bond
21 of 45
The ability of an atom to attract the bonding electrons in a covalent bond
Electronegativity
22 of 45
A compound that releases H+ ions in an aqueous solution--it acts as a proton donor
Acid
23 of 45
Proton acceptor
Base
24 of 45
A soluble base which releases OH- in a aqueous solution
Alkali
25 of 45
The number of protons in one atom of an element
Atomic number
26 of 45
Atoms of the same element with different numbers of neutrons
Isotopes
27 of 45
A region of space that can hold up to 2 electrons with opposite spins
Orbital
28 of 45
The energy needed to remove one electron from each atom in mole of gaseous atoms of an element
First ionisation energy
29 of 45
The mass of an atom of an isotope on a scale where the mass of an atom of 12C is exactly 12
Relative isotopic mass
30 of 45
The average mass of an atom of an element on a scale where the mass of an atom of 12C is exactly 12
Relative atomic mass (Ar)
31 of 45
The average mass of a molecule of a substance on a scale were the mass of an atom of 12C is exactly 12
Relative molecular mass (Mr)
32 of 45
The average mass of a formula unit of a substance on a scale where the mass of an atom of 12C is exactly 12
Relative formula mass (Mr)
33 of 45
The amount of a substance that contains the same number of particles as there are atoms in exactly 12g of 12C.
Mole
34 of 45
The mass (in g) of 1 mole of a substance. The units are g mol-1
Molar mass
35 of 45
The proportion in which substances react in a chemical reaction
Stoichiometry
36 of 45
Shows the number of atoms of each element in one molecule of the substance
Molecular formula
37 of 45
Shows the simplest whole number ratio of atoms of each element present in a substance
Empirical formula
38 of 45
The attraction of a shared pair of elections for the nuclei of two atoms
Covalent bond
39 of 45
The ability of an atom to attract the bonding electrons in a covalent bond
Electronegativity
40 of 45
A compound that releases H+ ions in an aqueous solution--it acts as a proton donor
Acid
41 of 45
Proton acceptor
Base
42 of 45
A soluble base which releases OH- in a aqueous solution
Alkali
43 of 45
A compound formed when the H+ ion from an acid is replaced by a metal ion or ammonium ion
Salt
44 of 45
A molecule in which the covalent bonding extends throughout the whole crystal, usually in three dimensions
Giant molecule
45 of 45
Other cards in this set
Card 2
Front
The smallest possible component in an element
Back
Atom
Card 3
Front
A substance composed of two or more elements, chemically bonded together
Back
Card 4
Front
An arrangement of atoms covalently bonded together
Back
Card 5
Front
A shared pair of electrons holding atoms together in a molecule
Back
Related discussions on The Student Room
Similar Chemistry resources:
5.0 / 5 based on 12 ratings
0.0 / 5
0.0 / 5
0.0 / 5
0.0 / 5
4.0 / 5 based on 1 rating
4.5 / 5 based on 10 ratings
4.0 / 5 based on 3 ratings
Comments
No comments have yet been made