WorksheetsUnit 4 Review
Total questions: 10
Worksheet time: 9mins
Sodium hydroxide (NaOH) when placed into water dissolves. What ions are created when this happens?
Na+
Na+ and OH-
OH-
H+ and O-
How many atoms of sodium would we have if we had 3 moles of sodium?
1.807E24
6.022E23
8.077E22
2.007E23
According to the Law of Definite Proportions, if NaCl is 39.4% sodium (Na), then what mass of salt would you have if 23.9 grams was contributed by chlorine?
39.4 g NaCl
58.4 g NaCl
67.8 g NaCl
12.7 g NaCl
In the compound AgNO3, how many moles of oxygen are there?
1
2
3
4
In the compound Mg(C2H3O2)2, how many moles of hydrogen are there?
3
2
6
4
What is the molar mass of Na3PO4?
163.9 g/mol
70.0 g/mol
212.7 g/mol
122.4 g/mol
If you had 24.68 g of AgCl, how many moles would you have?
0.1722 moles
0.9276 moles
0.0013 moles
0.4377 moles
A compound has a composition of 94.1% oxygen, and 5.9% hydrogen. What is the empirical formula?
HO
H2O
H2O2
H3O
If you have 72.43 grams of copper II sulfate, how many atoms of copper would you have?
2.73E23 atoms Cu2+
7.88E22 atoms Cu2+
6.022E23 atoms Cu2+
1.83E24 atoms Cu2+
If you started with 15.67 grams of magnesium carbonate, but only had 7.58 grams left over after heating, what would the hydrate formula be?
MgCO3 . 5H2O
MgCO3 . 7H2O
MgCO3 . 2H2O
MgCO3 . 4H2O
