Chemistry Week 25
description
Transcript of Chemistry Week 25
Chemistry Week
25
Please get out your Classwork and a
calculator!
March 6, 2013
AGENDA:1 – Agenda/ Bell Ringer 2 – Review HW3 – CN: Gram to Gram
Stoichiometry4 – Work Time
Today’s Goal:Students will be able to
convert complete 3-step stoichiometry conversions between grams and grams.
Homework1. Gram to Gram
Stoichiometry2. Friday is the Last Day
to make up last week’s quiz.
Wednesday, March 6th
Objective: Students will be able to convert complete
2-step stoichiometry conversions between grams and grams.
Bell Ringer: 2 C4H10 + 13 O2 8 CO2
+ 10 H2O
Set-up the units for converting moles of O2 to grams of CO2.
Moles O2 x ________ x _________ = grams CO2
March 6, 2013
AGENDA:1 – Agenda/ Bell Ringer 2 – Review HW3 – CN: Gram to Gram
Stoichiometry4 – Work Time
Today’s Goal:Students will be able to
convert complete 3-step stoichiometry conversions between grams and grams.
Homework1. Gram to Gram
Stoichiometry2. Friday is the Last Day
to make up last week’s quiz.
Wednesday, March 6th
Objective: Students will be able to convert complete
2-step stoichiometry conversions between grams and grams.
Bell Ringer: 2 C4H10 + 13 O2 8 CO2
+ 10 H2O
Set-up the units for converting moles of O2 to grams of CO2.
Moles O2 x moles CO2 x molar mass CO2= gCO2
moles O2 1 mol CO2
Balanced Chemical Equation:a A b B
Coefficients = # moles of each
compound
Grams Moles Moles Grams
A A B B
÷ Molar Mass of A
x Molar Mass of Bx b
a
Obj: SWBAT complete 3-step stoichiometry conversions between grams and grams.
Date: 3/6/2013
2 Mg + 1 O2 2 MgO
Grams A Mole A Mole B Gram B
How many grams of MgO would you form
from
25 grams of Mg?1. Calculate Molar Mass for both
compounds in the problem.1. Molar Mass Mg =
24.3 O = +
16
40.3 g
1mol
2. Molar Mass Mg =
24.3
24.3 g
1mol
Practice Problem: Gram A Mole A Mole B Gram B
2 Mg + 1 O2 2 MgOGrams A Mole A Mole B Gram
BHow many grams of MgO would you form
from 25 gram of Mg?25 g Mg x 1 mol Mg
24.3 g Mg x
2 mol Mg2 mol MgOx =
1 mol MgO40.3 g MgO
25 x 1 x 2 x 40.3 g MgO 24.3 x 2 x 1
= 201548.6
= 41.5 g MgO
Set-Up Help
Balanced Chem Eq: aA bB1. Calculate the molar masses of both
compounds in the problem2. Convert: remember Given and WantGiven(g) x1 mol Given x mol Want x Mol.mass Want =
Mol.mass Given mol Given 1 mol Want3. Multiply everything in numerator. 4. Multiply everything in the denominator5. Divide Numerator by Denominator.
Set-Up Help
Balanced Chem Eq: aA bB Mole A Mole B Gram B:Mole A x b Mole B x Molar Mass B = Gram B
a Mole A 1 mol B
Gram A Mole A Mole BGram A x 1Mole A x b Mole B = Mole B
Molar Mass A a mol A