Quantitive Flashcards
LiBr name
lithium bromide
ZnSO4 name
zinc sulfATE
Fe(NO3)2 name
iron nitrate
magnesium oxide formula
MgO
ammonium nittrate formula
NH4NO3
calcium hydroxide formula
Ca(OH)2
balance Fe + 02 -> Fe2O3
4Fe + 3O2 -> 2Fe2O3
balance Xe + F2 -> XeF6
Xe + 3F2 -> XeF6
balance C3H8 + SO2 -> CO2 + H20
C3H8 + SO2 -> 3CO2 + 4H20
3a
7 + 35.5 = 42.5
3b
1 + 14+ 48 = 63
3c
54 + (3x(32+64) = 342
whats the Mr of MgSO4
120
% of Mg in MgSO4
24/120 x 100 = 20%
% of S in MgSO4
32/120 x 100 = 27%
% of O IN MgSO4
64/120 x 100 = 53%
5a
(80 + 76 + 79)/3 = 78.3cmcubed
5b
range = 80-67=4
uncertainty = 4/2
78.3 ±2cmcubed
define isotopes
atoms of the same element with samenumber of protons different numbers of neutrons
6b
both isotopes have 8 protons
both isotopes have 8 electrons
isotope 18 was 10 neutrons
isotope 16 has 8 neutrons
7a
the average mass of an atom compared to 1/12 of a carbon - 12 atom
7b
(72/100 x 85) + (28/100 x 87)
= 61.2 + 24.36
= 85.6
8
mass/mr = 50/200
= 0.25 moles
9
mass = moles x mr
= 0.80 x 79.5
=63.6g
why does it appear the gas to have decreased in mass
carbon dioxide was produced which is a gas sp the initial solid decreased in mass
10ii
the reaction was complete
10bi
oxyegn reacted with magneisum which formed magnesium oxide
11
32/72 = 0.44
56 x 0.44
= 24.9g
solute definition
substance that will dissolve in a liquid
solvent definition
a liquid in which the solute will dissolve in
solution definition
a mixture of the solute and solvent
12b
conc = mass/volume
24/0.2
= 120g/dmcubed
