Rapid Fire Questions
What is a mole?
A counting Unit
6.023 x 10^23 atoms
What is the equation for percent yield?
(Actual / Theoretical) x 100
What are the 5 main types of Chemical Reactions?
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion
What does Stoichiometry allow us to do?
Determine the amount of products given the amount of reactants used
How many atoms are in 2 moles of Lithium?
1.2046 x 10^24 atoms
What is a limiting reactant?
The reactant that is used up first and prevents more products from being formed
What type of reaction is below?
___Fe + ___O2 ---> ___Fe2O3
Synthesis
What is Avagadro's number?
6.023 x 10^23
(12.01 x 6) = ~72.066 grams
__Fe + ____Cu2SO4 🡪 ___Fe2(SO4)3 + ____Cu
If 6.7 moles of Fe are used in the reaction, how many moles of Cu should be produced?
6.7 ( 6 moles Cu / 2 moles Fe) = 20.1 moles Cu
What type of reaction is below?
__CH4 + __O2 -->__CO2 + __H2O
Combustion
What is the molar mass of Oxygen?
16 grams / mole
How many atoms are in 19.02 grams of Boron?
(19.02 / Molar Mass) x Avagadro's Number = 1.059 x 10^24 atoms
If 0.35 moles were produced in a reaction, but stoichiometry predicted there should have been 0.38 moles produced, what is the percent yield?
(0.35 / 0.38) x 100 = 92.1%
How can you physically tell a double replacement reaction has occured?
A precipitate (solid) has formed
If I have 1 mole of Magnesium, how much would that weigh?
~24.3 grams
How many grams does 1.04 x 10^ 88 atoms of Hydrogen weigh?
1.74 x 10^64 grams
__Fe + ____Cu2SO4 🡪 ___Fe2(SO4)3 + ____Cu
If 1 mole of Fe reacted with 1 mole of Copper (I) Sulfate, what is the limiting reactant?
What is the theoretical yield in moles?
1 mole of Fe = 0.5 moles of Fe2(SO4)3
1 mole of Cu2SO4 = 0.33 moles of Fe2(SO4)3
Cu2SO4 is the limiting reactant. The theoretical yield is 0.33 moles
What happens in a single replacement reaction involving chlorine gas (Cl2) and sodium bromide (NaBr)
Br is replaced by Cl2