Catalyst – May 6-4, 2011Grab a calculator!

Monday Mystery Element!

1. Used to make batteries

2. Can cause kidney failure and high blood pressure

3. Found in tobacco leaves

Catalyst – May 6-4, 2011

Monday Mystery Element!

1. Used to make batteries

2. Can cause kidney failure and high blood pressure

3. Found in tobacco leaves

Discovered by Strohmeyer in 1817…..it is……

CADMIUM!

Today’s Agenda

Catalyst Welcome to STOICHIOMETRY!!! Holy Moley! Moles – Particles/Particles – Moles Moles – Mass/Mass – Moles Work Time Exit Question

HOMEWORK: Stoichiometry Worksheet

Today’s Objectives

SWBAT perform mole – particle and particle – mole calculations.

SWBAT calculate the molar mass of chemical substances.

SWBAT perform mole-mass and mass-mole calculations.

What is a mole to us chemists? A benign overgrowth of cells because of

a failure in mitosis? NO! But gross…

A rascly little rodent? NOOOO!

A TV show featuring celebrities? NOOOOO!

Then WHAT IS IT?????!!!???!?!?!???!!!!

Think of the term “a dozen”…

How many donuts are in

a dozen?

How many eggs are in a

dozen?

The Mole

Just like a dozen refers to 12 objects…

The mole refers to…

6.02 x 1023

particles

The Mole

This number is called Avogadro’s number…

6.02 x 1023

EQUALS

602,000,000,000,000,000,000,000

http://molechemistry.info/

Avogadro’s Number

Key Point #1:

1 mole (mol) =

6.02 x 1023

atoms OR molecules

Avogadro’s Number

Stoichiometry Calculations Part One

Moles – Particlesand

Particles – Moles(Particles = Atoms or

Molecules)

Avogadro LOVES Us!

Key Point #2: Avogadro's number (6.02 x 1023) is used to convert between moles and particles (atoms/molecules). It all relates back to the mole… Guess what’s coming back…

TRAIN TRACKS!!!

Step 1: What to what?

Step 2: Write conversion factor(s)

Step 3: Train tracks

Write this down!!!

How many atoms of Na are in

3.4 moles Na?

Avogadro’s Number: Example #1

Scientific Notation on the Calculator Don’t forget! When you need to type in a scientific notation number like 6.02 x 1023… Type 6.02 EE 23 instead

SAVE TIME AND LOOK COOL!

Write this down!!!

How many moles of N2 are in

250 molecules N2?

Avogadro’s Number: Example #2

How many molecules of C12H22O11 are in 2.1 moles of C12H22O11?

Avogadro’s Number: You Try!

Stoichiometry Calculations Part Two

Moles – Massand

Mass – Moles

OOOH, I want some more train tracks!

Key Point #3: Molar mass is the number of grams in one mole of a substance. It is used to convert between moles and mass. But Ms. Stroh, how am I ever going to

find out this information?

“What is the molar mass?” means…

“How many grams are in one mole of a substance?”

1 mol C =

Molar Mass: Example #1

12.01 g C

1 mol Na =

Write this down!!!

Molar Mass: Example #2

22.99 g Na

1 mol CO2 =

Write this down!!!

Molar Mass: Example #3

44.01 g CO2

101.1 g KNO3

Molar Mass: You Try!

1 mol KNO3 =

If we have 3.5 moles of KNO3, how many grams of KNO3

would we have?

Write this down!!!

Molar Mass: Step-Up Problem #1

If we have 20 grams CH4, how many moles of CH4 do

we have?

Write this down!!!

Molar Mass: Step-Up Problem #2

Independent Practice

Worksheet time! Show your work!

Finish for Homework!Show Train Tracks on #7-14

Exit Question

1. How many molecules are in 1 mole of NH4?

2. How many grams are in 2.3 moles of NH4

HW: Finish Worksheet and read 12.1 and 12.2 in book!