Inorganic Chemistry - Module 1 Flashcards
A sample of bromine contains 53.0% of bromine-79 and 47.0% of bromine-81. Determine the relative atomic mass of bromine.
Ar = 53.0/100 x 79 + 47.0/100 x 81 = 79.94
Define relative isotopic mass.
The mass of an atom of an isotope compared with 1/12 of the mass of an atom of carbon-12.
Define relative atomic mass.
The weighted mean mass of an atom compared with 1/12 of the mass of an atom of carbon-12.
What is the equation for calculating the amount of a substance?
n = m/M (n = amount of substance, m = mass, M = molar mass)
Calculate the amount, in mol, for 8.00g of BeF2. (Ar Be = 9, F = 19)
8.00/47 = 0.170 mol
What are the equations for calculating the amount of moles in a solution?
n = c x V(in dm3) OR (c x V(in cm3))/1000
What is the amount, in moles, of NaOH dissolved in 25.0cm3 of an aqeous solution of concentration 0.0125 mol dm-3?
(0.0125 x 25.0)/1000 = 3.125 x 10-4 mol
What is the equation for calculating the amount of moles in gases?
n = V (in dm3)/24.0 OR n = V (in cm3)/24000
Define acid.
A species that is a proton-donor.
Define base.
A species which is a proton-acceptor.
Define alkali.
A base which dissolves in water, forming hyroxide ions.
What can acids react with/be neutralised by to form salts?
Carbonates, bases, or alkalis.
What types of salts do sulphuric, hydrochloric, and nitric acid form, respectively?
- Sulphuric acid - Sulphate salts
- Hydrochloric acid - Chloride salts
- Nitric acid - Nitrate salts
What is the oxidation number of a combined oxygen atom?
-2
What is the oxidation number of a combined hydrogen atom?
+1
