What's in a Unit?
What are the units of density?
g/ml
What conversion factor is needed to convert mL to L?
1000 ml = 1 L
How many atoms or molecules are in a mole?
6.022 x 1023 or Avogadro's number.
What does concentration of a solution mean?
Molarity
This is the solid that remains when two aqueous solutions are mixed together.
Precipitate
What are the units of percent yield?
%
What conversion factor is needed to convert mg to g?
1000 mg = 1 g
How many moles of KCl are in the following reaction?
2 KCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 KNO3(aq)
2
Given 2.00 grams of a certain solid, it is dissolved in 100 mL of solution. How does one determine the concentration of the resultant solution?
Divide the mass of the solid by its formula mass to get moles and then divide by the volume to get molarity.
Given two aqueous reactants, how do you determine if a precipitate will form?
KCl(aq) and Pb(NO3)2(aq)
Switch cations and anions and apply the solubility rules.
What are the units of molarity?
mol/L
What conversion factor is needed to convert g to kg?
1000 g = 1 kg
How many moles of PbCl2 can be produced from KCl are in the following reaction?
2 KCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 KNO3(aq)
1
How can you determine the mass of solid needed to make a known concentration of a solution?
Multiply the number of moles and volume needed by the formula weight of the solid.
After determining the potential products in any reaction, what should you do to ensure the reaction is correct?
Balance the reactions and products.
What are the units of atomic, molecular, and formula mass?
g/mol
How to do convert from mass of substance to moles of a substance and vice versa?
Divide by atomic, molecular, formula mass of substance or multiply by atomic, molecular, formula mass of substance.
How many moles of lead ions are in Pb(NO3)2?
2 KCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 KNO3(aq)
1
How can you determine the volume of solution needed to make a known concentration from another solution?
M1V1=M2V2
How to you write a complete ionic equation?
1. Solids, liquids, gases, remain.
2. Aqueous substances split into their counterpart ions.
3. Check.
What are the units of conductivity?
S/m
How to do convert from moles of one substance to moles of another in a chemical reaction?
Multiply by the appropriate stoichiometric coefficients.
How many moles of nitrate ions are in Pb(NO3)2?
2 KCl(aq) + Pb(NO3)2(aq) → PbCl2(s) + 2 KNO3(aq)
2
DAILY DOUBLE
What procedure is used to determine the concentration of an unknown solution by reacting it with a known volume of another known concentration solution?
Titration! NOT M1V1=M2V2
How to you write a net ionic equation?
1. Solids, liquids, gases, remain.
2. Aqueous substances split into their counterpart ions.
3. Check.
4. Eliminate molar multiples of reactants and products found on either side of the reaction.
5. Rewrite.