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  • Proportional Relationships I have 5 eggs. How many cookies can I make? 3/4 c. brown sugar 1 tsp...
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Proportional Relationships • I have 5 eggs. How many cookies can I make? 3/4 c. brown sugar 1 tsp vanilla extract 2 eggs 2 c. chocolate chips Makes 5 dozen cookies. 2 1/4 c. flour 1 tsp. baking soda 1 tsp. salt 1 c. butter 3/4 c. sugar 5 eggs 5 doz. 2 eggs = 12.5 dozen cookies Ratio of eggs to cookies Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

Proportional Relationships I have 5 eggs. How many cookies can I make? 3/4 c. brown sugar 1 tsp vanilla extract 2 eggs 2 c. chocolate chips Makes 5 dozen

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Page 1: Proportional Relationships I have 5 eggs. How many cookies can I make? 3/4 c. brown sugar 1 tsp vanilla extract 2 eggs 2 c. chocolate chips Makes 5 dozen

Proportional Relationships

• I have 5 eggs. How many cookies can I make?

3/4 c. brown sugar1 tsp vanilla extract2 eggs2 c. chocolate chipsMakes 5 dozen cookies.

2 1/4 c. flour1 tsp. baking soda1 tsp. salt1 c. butter3/4 c. sugar

5 eggs 5 doz.

2 eggs= 12.5 dozen cookies

Ratio of eggs to cookies

Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

Page 2: Proportional Relationships I have 5 eggs. How many cookies can I make? 3/4 c. brown sugar 1 tsp vanilla extract 2 eggs 2 c. chocolate chips Makes 5 dozen

Proportional Relationships

• StoichiometryStoichiometry– mass relationships between substances in a chemical

reaction– based on the mole ratio

• Mole RatioMole Ratio– indicated by coefficients in a balanced equation

2 Mg + O2 Mg + O22 2 MgO 2 MgOCourtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

Page 3: Proportional Relationships I have 5 eggs. How many cookies can I make? 3/4 c. brown sugar 1 tsp vanilla extract 2 eggs 2 c. chocolate chips Makes 5 dozen

Stoichiometry Steps1. Write a balanced equation.2. Identify known & unknown.3. Line up conversion factors.

– Mole ratio - moles moles– Molar mass - moles grams– Molarity - moles liters soln– Molar volume - moles liters gas

Core step in all stoichiometry problems!!

– Mole ratio - moles moles

4. Check answer.Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

Page 4: Proportional Relationships I have 5 eggs. How many cookies can I make? 3/4 c. brown sugar 1 tsp vanilla extract 2 eggs 2 c. chocolate chips Makes 5 dozen

1 mol of a gas=22.4 Lat STP

Molar Volume at STP

Standard Temperature & Pressure0°C and 1 atm

Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem

Page 5: Proportional Relationships I have 5 eggs. How many cookies can I make? 3/4 c. brown sugar 1 tsp vanilla extract 2 eggs 2 c. chocolate chips Makes 5 dozen

Molar Volume at STP

Molar Mass(g/mol)

6.02 1023

particles/mol

MASSIN

GRAMSMOLES

NUMBEROF

PARTICLES

LITERSOF

SOLUTION

Molar Volume (22.4 L/mol)

LITERSOF GASAT STP

Molarity (mol/L)

Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem


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