Exam (elaborations)
CHM 1025L Final Review Exam/14 Q’s and A’s/Distinction Graded
CHM 1025L Final Review Exam/14 Q’s and A’s/Distinction Graded
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CHM 1025L Final Review Exam/14 Q’sand A’s/Distinction Graded
Density Formula - -D=M/V
-Volume Formula - -Mass/Density
-Mass Formula - -M=V x D
-Ionic Compounds - -Consist of positive ions of metals and negative ions of
non-metals. Have strong ionic bonds, electrostatic forces of attraction. High
melting/boiling points, soluble in water. Conducts electricity in
solution/molten.
-Double Displacement Reactions - -AB + CD = AD + CB
-Single Displacement Reactions - -A + BC = AC + B
-Moles Formula - -Mass of sample x (1 mol/ MW of Compound)
-To find the number of molecules - -Moles of sample x (6.022 x 10^23/1
mol)
-To find the number of atoms - -Molecules of sample x (atoms in sample/1
molecule)
-How to find the Empirical Formula - -1) Determine the mass of each
element
2) Determine the moles of each element
3) Divide by the smallest number of moles present
4) Multiply both numbers by a multiplier (use same for both)
-Limiting Reactants - -1a) mL of sample x (1 mol/ 1L) x (1L/1000ml)= moles
1b) g of sample x (1 mol/MW)= moles
2) moles of sample x (1 reaction/coefficient of sample in reaction from
equation) = ratio**
**Smaller ratio is the limiting reactant
-Use Stoichiometric calculations to determine the theoretical yield and
percent yield - -1) Need to find balanced equation
2) Mass of Sample A > Moles of sample A > moles of Sample B > Mass of
sample B (Theoretical Yield)
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