Stoichiometry
H2SO4 + 2KOH -> K2SO4 + H2O
The number moles of KOH are needed to make 16 moles of water.
What are 32 moles?
This is the definition of a limiting reagent.
What is the chemical that gets used up first in a reaction. It is the chemical that limits how much product you can make.
This is the equation for calculating percent yield.
Percent yield = (actual yield / theoretical yield) x 100
The absorption of heat in a reaction is called ___.
What is endothermic?
Given the following reaction identify the reactant:
H2O2 --> H2 + O2
What is H2O2
2 cups flour + 3 eggs + 1 tbs oil -> 4 waffles
The number of waffles that can be made from 16 cups of flour, assuming you have enough of all other ingredients.
What are 32 waffles?
If you're making ham sandwiches. Each sandwich needs 2 pieces of bread and one slice of ham. If you have 30 pieces of bread and 20 slices of ham, this is the limiting reagent.
What is the bread?
If you actually produced 12.8 grams of a substance, but theoretically expected 13.6 grams, this was your percent yield.
What is 94%?
The sign of ∆Hrxn in an exothermic reaction.
What is negative?
Given the following reaction, identify the product
2Na + Cl2 --> 2NaCl
What is NaCl
Fe2O3 + CO2 --> 2Fe + 3CO2
The number of grams of Fe2O3 is needed to obtain 92.8 g of Fe.
What is 133 g Fe2O3?
2Cu + S --> Cu2S
This is the limiting reactant when 80 g of Cu reacts with 25 g of S.
What is copper?
The theoretical yield of a reaction if 46 grams of product were actually produced from a reaction that has 63.9% yield.
What is 72 grams?
2Mg + O2 -> 2MgO ∆Hrxn= -1203 kJ
The amount of heat released with the reaction of 24.7 moles of Mg.
What is -14857 kJ?
When heat is emitted from a reaction the reaction is said to be _____________.
What is exothermic
2NaOH + CO2 --> Na2CO3 + H2O
This number of grams of CO2 are needed to react with 3.5 grams of NaOH.
What is 1.925 g CO2?
2Na + Cl2 -> 2NaCl
The moles of NaCl produced when 2.7 moles of Na and 3.5 moles of Cl2 are reacted.
What is 2.7 moles?
CaCO3 --> CaO + CO2
The percent yield if 11.2 g of CaO is produced from 24.8 g of CaCO3.
What is 80.6%?
CH4 + 2O2 -> CO2 + 2H2O ∆Hrxn = -74.87 kJ
The heat associated with the combustion of 38.0 g of CH4.
What is -177 kJ?
When fossil fuels undergo a combustion reaction, they produce this greenhouse gas
What is carbon dioxide
SiO2 + 3C --> SiC + 2CO
The number of grams of CO produced from 43.6 grams of carbon.
What is 67.8 g of CO?
N2H4 + O2 --> N2 + 2 H2O
You have 1,000 g of N2H4 and 1,400 g of O2. The maximum amount of water produced is ___.
What is 1124 grams?
FeCO3 + O2 --> 2Fe2O3 +4CO2
If 75 g of FeCO3 is heated with an excess of oxygen, 45 g of Fe2O3 is produced. The percent yield of this reaction is ____.
What is 21.7%?
C + 2S -> CS2 ∆Hrxn = 92 kJ
The heat associated with the reaction of 28.3 g of sulfur.
What is 40.6 kJ?
The numeric relationship between chemical quantities in a balanced reaction that allows us to predict the amount of product that will form based on the amount of reactants.
What is stoichiometry