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WorksheetsTypes of Rxns, Balancing, Molar Mass and Molar Conversions
Total questions: 20
Worksheet time: 42mins
To balance an equation you should:
ONLY change subscripts.
ONLY change coefficients.
Change BOTH subscripts and coefficients.
C2H6 + 5O2 → 2CO2 + 3H2O2
Given this chemical equation, what are the REACTANTS?
C2H6 and 5O2
2CO2 and 3H2O2
Observe the reaction shown here. The formula for this equation is N2 + H2 → NH3 . Does this represent a balanced equation that obeys the Law of Conservation of Mass?
No. The reactants and products are not equal in numbers of atoms of each element.
Yes. The reactants and products are equal in numbers of atoms of each element.
2H2 + O2 --> 2H2O
Balance the following equation:
___ Mg+ ___ O2→___ MgO
1, 1, 3
2, 1, 2
1, 2, 1
2, 2, 2
The coefficient in 3 H2O is
3
H
2
O
Sodium reacts with chlorine gas to produce sodium chloride.
NaCl→ Cl + Na
Na+ CO2 → NaCO2
Na + Cl2→ NaCl
Na + Cl → NaCl
2Al +____ HCl → 2AlCl3 + 3H2
What is the role of the arrow sign in a chemical reaction?
Making sure atom counts on each side are the same.
Separating products and reactants.
Showing which substances were in the container first and which substances were added later.
Showing which substances are solids and which are liquids or gases.
Example: H2
The mass of one mole of an element is equal to
its atomic number from the periodic table, but in amus.
its atomic mass from the periodic table, but in amus.
its atomic mass from the periodic table, but in grams.
its atomic number from the periodic table, but in grams.
Shivani measures out 6.0 moles of epsom salt (MgSO4) to put in her bath. How many grams of MgSO4 went in the bath?
3.6 x 1024 g
720 g
0.050 g
340 g
What is the molar mass of table salt (NaCl)? Read all options! Be careful!
58.44 amu
35.45 g/mol
22.99 g/mol
58.44 g/mol
What is the molar mass of PbSO4?
303.27 g/mol
255.27 g/mol
163.87 g/mol
372.27 g/mol
