catalyst what are the components that affect the rate at which something dissolves? if i increase...
TRANSCRIPT
Catalyst• What are the components that affect the rate
at which something dissolves?• If I increase the temperature will a solute
dissolve more slowly or more quickly?
End
What Is This Reaction?Fe2O3 + 2 Al 2 Fe + Al2O3
If I have 2 mole of thermite, how do I determine the number of moles of Fe
produced?
Lecture 4.4 – Moles to Moles
Today’s Learning Targets• LT 4.5 – I can convert from moles of one compound
to moles of another compound using the mole ratio from a balanced chemical reaction.
Grams of Substance A
Grams of Substance B
Volume of Substance B
Atoms of Substance
A
Moles of A
Moles of B
Atoms of Substance
B
Molarity of Substance A
Focus for Last Unit
Grams of Substance A
Grams of Substance B
Molarity of Substance B
Atoms of Substance
A
Moles of A
Moles of B
Atoms of Substance
B
Molarity of Substance A
What is a mole ratio?
I. The Importance of Balanced Reactions
• We have been balancing chemical reactions so that we can use them in these calculations.
• Without a balanced reaction, we CANNOT do the calculations that we use in stoichiometry.
II. Mole Ratios• The coefficients in a balanced equation
represent the moles of each substance.• These coefficients can be used as a conversion
factor known as a mole ratio• Mole ratios allow for us to convert between
moles of two substances
Mole Ratio for Mg to Mg3N2
3Mg + N2 Mg3N2
Moles MgMoles Mg3N2
3 moles1 moles
Class Example
• For the following reaction: NaCl + CaO Na2O + CaCl2
• Write the mole ratio of NaCl to CaCl2?
Table Talk
• For the following reaction:_____Fe + ____CuSO4 ____Cu + ___Fe2(SO4)3
• Write the mole ratio of Fe to Cu?
How do we convert between moles of two substances?
I. Mole to Mole Conversion Factor
• Our conversion factor for converting moles to moles is:
MOLE RATIO
Class Example• For the following chemical reaction of the
airbag in our car: NaN3 (s) Na (s) + N2 (g)
If you have 6 moles of NaN3, how many moles of Na will this reaction produce?
Table Talk• For the following reaction:
N2O5 + H2O NH4OH + O2
• If you have 5 moles of N2O5 determine the number of moles of NH4OH do you get?
SUMMARIZE
White Board Problems
Question 1
• For the following reaction: 2HCl + K2SO3 2KCl + H2SO3
You react 7 moles of HCl with excess K2SO3. Determine the number of moles of H2SO3 that will be produced in this reaction.
Question 2
• For the following reaction:CS2 + 2 O2 C + 2 SO2
You have 4 moles of CS2, how many moles of SO2 are produced in this reaction?
Question 3
• If you end up with 272 grams of NH3 in the following reaction:
3 NH4SCN + FeCl3 3 NH3(g) + 3 HCl + Fe(SCN)3
How many moles of FeCl3 were used to produce this amount of NH3?
Question 4
• For the following reaction: 2KClO3 2KCl + 3O2
How many moles of O2 will be produced if you start with 7 moles of KClO3?
Question 5
• You are performing the following chemical reaction in the lab:
N2 + 3H2 2NH3
• You have 5 moles of N2 and excess H2. How many grams of NH3 will you produce once the reaction is produced?
Around the World
• Attempt the Around the World for today under Chemistry File Cabinet – Week of Nov. 12, 2013
• AP.4.4.Around the World
Closing Time• Lab Report Next Week!• Homework 4.4 – Moles to Moles