SECOND SEMESTER: UNIT 1 STOICHIOMETRY Spring 2015.

SECOND SEMESTER:UNIT 1 STOICHIOMETRY

Spring 2015

Agenda

Welcome Seating Chart Name Game Personal/Student Info

Learning Targets What do we already know? Mole-Mole Ratios Balancing Equations

Mass to Mass conversions??

Seating Chart

You need to arrange yourselves in alphabetical order ACROSS rows. You have 2 minutes.

GO!!

Review

Balance these equations:

__1_H2CO3 + _1__Ca → __1_CaCO3 + _1__H2

If 3 moles of Ca are used how many moles of CaCO3?

_2_K3PO4 + __3_Mg → _1__Mg3(PO4)2 + _6__ K If 2 moles of Mg are used how many moles of K are produced?

__1_CaC2 + __2_H2O → __1_Ca(OH)2 + _1__C2H2

If 8 moles Ca(OH)2 are produced how many moles of CaC2 are needed?

Agenda 1/21/15

Turn in Syllabus Letters1st Hour: Lab Drawers

Stoich Notes All types of conversions

Practice Mass-Mass conversions

HW: Complete Mass-Mass Assignment

Agenda 1/22/15

Turn in Syllabus Letters Stoich Notes HW Check

Use HW/Notes and Flowchart

Notes on % Yield

Chalk Lab

HW: Complete analysis for Chalk Lab

Percent Yeild

It tells us how good our experiment was.

Experimental Value X 100 Stoich Value

This tells us how far from the actual value we are.

Agenda 1/23/15

Complete Chalk Lab Must complete Analysis 1 before finishing

lab Checked by Mr. Gustin

Review Unit 6 for Quiz Monday

HW: Unit 6 Review Quiz Monday Chalk Lab due Monday

Agenda 1/26/15

Turn in Chalk Lab Tomorrow for Late Credit

Unit 6 Review Quiz Use your Stoich Flowchart

Complete Mass-Mass Worksheet (Stoich Practice) You will need to do this for tomorrow’s activities

HW: Complete Mass-Mass

Agenda 1/27/15

Turn in Chalk Lab Late Credit

Review Mass-Mass Hw HW Quiz

Limiting Reactants S’mores Lab

HW: Write up S’mores Lab

S’mores Safety

You MUST place a paper napkin down at your station. No food touches these tables!!

You must use a weighing dish for your food items No food touches the balances

Tip: Keep the marshmallow away from the flame it will burn!!!

Agenda 1/28/15

Discuss S’mores Lab Factor Label Limiting Reactant Turn in Lab

Limiting Reactant Notes Practice Problems with LR

HW: #1-5 on Limiting Reactants Worksheet

Limiting Reactant

S’mores Lab When you run out of marshmallows, you

can’t make s’mores. Chemistry

When a reaction runs out of one reactant the reaction stops.

The reactant that runs out first is called… THE LIMITING REACTANT

Practice Problem

2 Na + 1 Cl2 → 2 NaCl

If there are 6 moles Na and 5 moles Cl2 LIMITING REACTANT ________________

MOLES NaCl ________________

Practice Problem

2 Na + 1 Cl2 → 2 NaCl

23.0 g Na and 71.0 g Cl2 LIMITING REACTANTS

_________________

MOLES NaCl _________________

Agenda 1/29/15

Discuss Limiting Reactant HW What do I need to compare? Intro Problem

Limiting Reactant Lab Groups of 4…not 2

HW: Complete the Lab Write-Up

LR Check

Take out a half sheet of paper

NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2

If I am given 1.5g of Sodium Bicarbonate and .88g of Acetic Acid, which reactant is my limiting reactant?

(Hint: you may use any product to compare to).

LR Lab Safety In this lab you will be working in groups of

4..not 2. You will need goggles since we are using a

weak acid. When mixing the powder with the acid you

must make sure the balloons are held firmly around the test tube top so they do not pop off and ruin your data.

When the data has been taken, make sure to throw away your balloons and clean your test tubes thoroughly.

Post Lab Calculation Hint

Here is your chemical equation.

Is it balanced??

NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2

Agenda 1/30/15

Turn in Balloon Lab

Other types of Stoich Problems Volume of gas Number of molecules reacting

HW: #1-7 stoich packet

More Stoich

There are two more types of problems that we have not covered.

Take out your stoich flowcharts!!

Volume problems

_____ C6H14 + _____ O2 →_____ CO2 + _____ H2O

How many liters of oxygen are needed to burn 3.50g of C6H14 ? Assume reaction is at STP.

How many liters of gas are in one mole at STP?

Volume problems

2 C6H14 + 19 O2 →12 CO2 + 14 H2O

How many liters of oxygen are produced by burning 3.50g of C6H14 ? Assume reaction is at STP.

Answer: 8.66 L of oxygen How many liters of gas are in one mole

at STP?22.4 L of gas at STP = 1 mole

Molecule problems

2 C6H14 + 19 O2 →12 CO2 + 14 H2O

How many molecules of carbon dioxide are produced by burning 3.62L of oxygen ? Assume reaction is at STP.

How many molecules are in a mole?

Molecule problems

2 C6H14 + 19 O2 →12 CO2 + 14 H2O

How many molecules of carbon dioxide are produced by burning 3.62L of oxygen ? Assume reaction is at STP.

6.14x1022 molecules carbon dioxide How many molecules are in a mole?

6.022x1023 molecules = 1 mole

Agenda 2/4/15

Check Stoich Review Hand back everything

Review Balloon Lab

Practice More Stoich Problems

Extra Time: Work on cheat sheet for Test Tomorrow

__ Cu + __ AgNO3 __ Cu(NO3)2 + __ Ag

Balance this equation, you will need it in the next problem.

1, 2, 1, 2

1 Cu + 2 AgNO3 1 Cu(NO3)2 + 2 Ag

How many grams of silver would be produced from 3.50 grams of Cu?

11.89 grams Silver

Zn + 2 HCl ZnCl2 + H2

How many liters of H2 gas will be produced when 50.0 grams of Zn is combined with 0.9 mol of HCl?

LR = HCl10.08 L of Hydrogen Gas

___ Al + ___ HCl ___ AlCl3 + ___ H2

Balance this equation, you will use it in the next problem.

2, 6, 2, 3

2 Al + 6 HCl 2 AlCl3 + 3 H2

How many grams of Aluminum are needed to react with 171 grams of HCl?

42.2 grams of Al

___ C4H10 + ___ O2 ___CO2 + __ H2O Balance this equation, you will need it

for the next problem.

2, 13, 8, 10

2 C4H10 + 13 O2 8 CO2 + 10 H2O What is the percent yield of water if you

react 2.60 L of oxygen and only 0.073 moles of water are actually formed?

TY = 0.089 moles Oxygen82%

1 Cu + 2 AgNO3 1 Cu(NO3)2

+ 2 Ag How many grams of silver nitrate would

be used to produce 15.0 grams of copper (II) nitrate?

27.18 grams Silver nitrate

Agenda 2/5/15

Collect Stoich Review Last Minute Questions??

You will need: Cheat Sheet Stoich Flowchart CalculatorI will give you all Periodic Tables

HW: None, next up Gases!!

Zn + 2 HCl ZnCl2 + H2

How much excess reactant will be left over when 50.0 grams of Zn is combined with 0.9 mol of HCl?

Excess Zn = 20.7g

Agenda 2/6/15

Deflategate Debate Research articles and figure out where you

stand on the topic

HW: None, have a great weekend

Gases Intro

What are gases?

What do you know about gases?

How do you think gases relate to chemistry?

Etc…

Deflategate

The New England Patriots were accused of deflating their footballs under NFL regulations during the AFC Championship game (the game before the Super Bowl). A deflated football is easier to grasp and throw especially on a cold day.

There are two sides to every story, it is your job to read and determine if you think the Patriots did deflate the footballs, or maybe it was the cold weather that had the effect on the balls.