Balancing Equations
Balance the following equation:
H2 + N2 --> NH3
3H2 + N2 --> 2NH3
According to: 2NaCl (l) → 2Na (l) + Cl2 (g), how many moles of Na can 1 mole of NaCl produce?
1 mole of Na
What does (s) mean in a chemical equation?
solid
Convert 1 mole of Sodium (Na) into grams of Sodium (Na)
22.98 grams, or 23 grams of Sodium (Na)
What are the chemical compounds called to the left of the arrow in a reaction, and what are the chemical compounds called to the right of the arrow in a reaction?
Left: Reactants
Right: Products
Balance the following equation:
C + S8 --> CS2
1C + 1S8 --> 4CS2
According to: 2NaCl (l) → 2Na (l) + Cl2 (g), how many moles of Cl2 can one mole of NaCl produce?
0.5 moles Cl2
What does (g) mean in a chemical equation?
gas
Convert 5 moles of Potassium (K) into grams of Potassium
195 grams of Potassium (K)
Balance the following equation:
CH4 + Cl2 --> CCl4 + HCl
CH4 + 4Cl2 --> CCl4 + 4HCl
According to: 2NaCl (l) → 2Na (l) + Cl2 (g), how many moles of Cl2 can 54 moles of NaCl make?
(54 moles NaCl) x (1 mole of Cl2/2 moles Na) = 54/2 = 27 moles of Cl2 can be produced
What does (aq) mean in a chemical equation?
aqueous, aka dissolved in water
Convert 53 grams of Ca into moles of Ca
1.32 moles of Ca
Define the term excess reagent
The reactant within a chemical equation that does NOT determine how much product will be produced, will remain in excess
C2H6 + O2 --> CO2 + H2O
2C2H6 + 7O2 --> 4CO2 + 6H2O
According to: 2NaCl (l) → 2Na (l) + Cl2 (g), how many moles of Na can 100 grams of NaCl make?
(100 grams of NaCl) x (1 mole NaCl/58.44 grams NaCl) x (2 moles of Na)/(2 moles NaCl) = (100 grams)/(58.44 grams) = 1.7 moles of Na
What is the number in front of the chemical compound called?
Example: 2Al
Coefficient
Convert 117.3 grams of CaO into moles of Cao
2.09 moles of CaO (will also accept 2 moles of CaO)
Explain how to find the limiting reagent in a chemical reaction
must do a stoichiometry problem for each of the reactants
convert each of the reactants into the product
whichever reactant produces the least amount of product, will be the limiting reagent as it will limit the amount of product that can be produced
Balance the following equation:
BaO + Al --> BaAl4 + Al2O3
3BaO + 14Al --> 3BaAl4 + Al2O3
According to: 2NaCl (l) → 2Na (l) + Cl2 (g), how many grams of Cl2 can 57 grams of NaCl produce?
57 grams NaCl x (1 mole NaCl/58.44 grams NaCl) x (1 mole of Cl2/2 moles of NaCl) x (70 grams Cl2/1 mole Cl2) = 3,990 / 116.88 = 34 grams of Cl2
What is the number at the end of a chemical compound called?
Ex: Al4
Subscript
Convert 53.8 moles of glucose (C6H12O6) into grams of glucose (C6H12O6)
9,684 grams of glucose (C6H12O6)
Explain to me how to calculate how much of the excess reagent remains after a reaction
first find limiting
then, must find the amount of excess reagent that is USED in the reaction
lastly, subtract the amount of excess reagent used from the amount of excess that was present at the beginning of the reaction