1. 1 mole = particles : Avogadro’s number Particles = molecules Molar mass of each element can be found on the periodic table. The unit is in grams/mol or g/mol. Calculate the molar mass of mercury (II) sulfate.

2. p.326. #31, A sample of sodium sulfite (Na 2 SO 3 ) has a mass of 2.25 g. (a) How many Na+ ions are present? (b) How many SO 3 -2 ions are present? (c ) What is the mass in grams of one formula unit of Na 2 SO 3 ?

3. #33, A sample of ethanol (C 2 H 5 OH) has a mass of 45.6 g. (a) How many hydrogen atoms does the sample contain?

4. Which has the larger percent by mass of sulfur, H 2 SO 3 or H 2 S 2 O 8 ? Percent formula =

5. Empirical formula is the __________ ratio of elements in a compound. Ionic compound: Is the empirical formula the correct formula? (please do not answer and let the rest of the class some time to think) Molecular compound: is the empirical compound the correct formula? The relationship of molecular formula and empirical formula

6. Determine the molecular formula for ibuprofen. Analysis of ibuprofen yields a molar mass of 206 g/mol and a percent composition of 75.7% C, 8.80% H and 15.5% O.

7. Combustion reaction: combustion, burns You need hydrocarbon O 2 The process produces CO 2 and H 2 O, both in __________ state Write the balanced equation of the combustion of liquid C 6 H 13 OH

8. Synthesis: synthesis, combination, composition Simple → complex or elements → compound Write the balanced synthesis equation of magnesium bromide

9. Decomposition: decomposition Complex → simple or compound → elements Write the balanced decomposition equation of magnesium bromide.

10. Single Replacement Reaction Metal(A) + Ionic solution → Ionic solution + Metal(B) Write the balanced equation of nickel added to the solution of magnesium chloride.

11. Double Replacement Solution + solution → cations change partners (thoughts: can a cation change partner with an anion?) Write the balanced equation of adding the solution of sodium phosphate into the solution of manganese (II) chloride. Write complete ionic equation. Write net ionic equation.

12. Dissociation equation: Solid ionic compound is put into water. Ionic compound will dissociate into cations and anions. Write the balanced equation of when calcium iodide is put into water.