Balancing Reactions
Balancing chemical reactions can be done by adding __________
Coefficients
Identify the type of reaction:
Na + Cl --> NaCl
Synthesis
In a balanced chemical reaction, what determines the molar amount of each compound?
Coefficient
What is the equation for percent composition by mass?
Mass part/mass whole *100
What does the law of conservation of mass state?
Matter cannot be created nor destroyed
What number should go in the blank:
2H2 + ___O2 --> 2H2O
1
Which reaction is known as "The Swap"
Double Replacement
Given the reaction
NaCl -> Na+ + Cl- ,
one mole of NaCl will lead to how many moles of Cl-?
one mole
What is the percent composition by mass of C in CO2?
27.3%
If a reaction had 20 g of reactants, how many g of product should be produced?
20 g
Balance the following reaction:
____ K + ____Cl2 --> ____KCl
2 K + 1 Cl2 -->2 KCl
What kind of reaction is this?
BaCl2 + Mg(SO4) --> Ba(SO4) + MgCl2
Double replacement
Given the reaction:
2NH3 --> N2 + 3H2
4 moles of NH3 will produce how many moles of N2
2 moles of N2
What is the percent composition by mass of H in H2O?
11%
What three (3) things are conserved in every reaction?
Mass, Charge, Energy
Balance the following reaction
___Al + ___Cl2 ---> ___AlCl3
2Al + 3Cl2 ---> 2AlCl3
Which two reaction types are opposites?
Synthesis and Decomposition
Given the reaction:
2NH3 --> N2 + 3H2
4 moles of NH3 will produce how many moles of H2?
6 moles H2
What is the percent composition by mass of H in N2H6?
18%
Given the reaction:
A + B --> C + D
If you had 10 grams of A, and 6 grams of C, producing 12 grams of C, how many grams of D would be produced?
4 grams of D
Balance the following reaction:
____C8H18 + ____ O2 ---> ____CO2 + ____H2O
1 C9H20 + 19 O2 ---> 9CO2 +10 H2O
Predict the products:
Fe + MgCl2 -->
Given the reaction:
2Fe2O3 + 3C --> 4Fe + 3CO2
30 moles of C would produce how many moles of Fe?
40 moles
What is the percent composition by mass of O in Mg(NO3)2
65%
In a laboratory investigation, a solution that contains 20 g of Pb(NO3)2 reacts completely with a solution that contains 12.0 g of NaI2, producing 30g of PbI and an undetermined mass of a second product, NaNO3. This reaction is represented by the balanced equation below:
Pb(NO3)2 + 2NaI → PbI2 + 2NaNO3
Determine the mass of NaNO3 produced. Show your work below
2 grams NaNO3