Flashcards in Module 2 Deck (31)
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1
Proton Number
The number of protons in the nucleus of an atom
2
relative atomic mass
The weighted mean mass of an atom of an element compared with
one-twelfth of the mass of an atom of carbon-12.
3
relative formula mass
The weighted mean mass of the formula unit of a compound compared
with one-twelfth of the mass of an atom of carbon-12.
4
relative isotopic mass
The mass of an atom of an isotope compared with one-twelfth of the
mass of an atom of carbon-12.
5
relative molecular mass
The weighted mean mass of a molecule of a compound compared
with one-twelfth of the mass of an atom of carbon-12.
6
isotopes
Atoms of the same element with different numbers of neutrons and different masses
7
molar mass
The mass per mole of a substance
8
mole
The amount of any substance containing as many elementary particles as there are carbon
atoms in exactly 12 g of the carbon-12 isotope, that is, 6.02 × 1023 particles.
9
anhydrous
Containing no water molecules
10
anion
A negatively charged ion with more electrons than protons.
11
cation
A positively charged ion with fewer electrons than protons.
12
concentration
The amount of solute, in moles, dissolved in 1dm3
(1000 cm3
) of solution
13
empirical formula
a The formula that shows the simplest whole-number ratio of atoms of each
element present in a compound.
14
hydrated
A crystalline compound containing water molecules
15
molecular ion
The positive ion formed in mass spectrometry when a molecule loses an electron
16
water of crystallisation
Water molecules that are bonded into a crystalline structure of a
compound
17
Equation to work out moles of a solid
Moles = mass/Mr
18
Equation to work out moles of a solution
moles = MV/1000
19
Equation to work out moles of a gas (in standard conditions)
moles = volume (dm3)/24
20
Ideal Gas Equation
PV=nRT
P = pressure in Pa
V = volume in m3
n = no. of moles
R = gas constant (8.31)
T = temperature in K
21
What is 25oc in Kelvin?
25+273 = 298K
22
Define strong acid
Completely dissociates in aqueous solution
23
Define weak acid
Partially dissociates in aqueous solution
24
Define Bronsted-Lowry acid
Proton donor
25
Define base
Proton acceptor
26
Define salt
When the proton of an acid is replaced by a metal ion
27
Define oxidation
Loss of electrons
28
Define reduction
Gain of electrons
29
What is the oxidation number of any element
0
30
What is the oxidation number of oxygen generally (with the exception of in peroxide)
-2
31
