Chemistry & Cooking What do you like more – food or Chemistry? Don’t rush your answer, really think about it I’m sure I know what you answer will be but I’m not sure if you really know how much they are alike.

Grilled Cheese Sandwiches!!! Who likes grilled cheese? I love them because they are fast, easy, and come on – who doesn’t love bread and cheese.

In order to make any food dish – you need a recipe In order to make any food dish – you need a recipe. This is a recipe I use for my grilled cheese. 2 slices of bread + 3 slices of cheese → 1 grilled cheese sandwich A recipe tells you the amount of each ingredient needed to make the your dish – just like a chemical equation.

Recipe = Chemical Equation CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (g) Just like in a recipe, the coefficients are used to tell you how much of each reactant are needed to make your product(s) .

Stoichiometry Process that allows chemists to predict the qualitative and quantitative outcomes of a chemical reactions. Qualitative: quality (Colors, textures, smells, tastes, appearance) of the substances – can be observed. Quantitative: quantity (mass, length, temperature, volume) of the substances – can be measured.

What does that mean? Stoichiometry identifies: Quality of the reactants & products: color of ppt, odor emitted from the reaction, heat produced, color of reactants prior to reaction Quantity of the reactants & products: mass of reactants, number of reactants needed, number of products made, mass of products.

Stoichiometry process Use of dimensional analysis to CONVERT between reactants and products in a chemical reaction. Using conversion factors: Avogadro's Number (6.02x1023 particles) Molar Volume (22.4L) Molar Mass (grams) Mole Ratio (use coefficients)

Lets make it about our grilled cheeses  2 slices of bread + 3 slices of cheese → 1 grilled cheese sandwich How many sandwiches can I make with 4 slices of bread and excess (plenty of) cheese? 1. Identify how many slices of bread you have: 4 slices 2. Identify how many slices of bread you need to make the number of grilled cheese the recipe makes: 2 slices bread = 1 grilled cheese 3. Use this as a conversion factor to find the number of grilled cheese you can make. 4 slices bread 1 grilled cheese = 2 grilled cheese 2 slices of bread MOLE RATIO

Mole ratio can be used as a conversion factor Shows the mole-to-mole ratio between two substances in a balanced equation Made from the coefficients of those two substances in the equation 2 slices bread = 1 grilled cheese 1 grilled cheese 2 slices of bread 2 slices of bread 1 grilled cheese OR

Lets make it about Chemistry  CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (g) What is the mole ratio between O2 & CO2? 2 mole O2 = 1 mole CO2 1 mole CO2 2 mole O2 2 mole O2 1 mole CO2 How many moles of CO2 are made from 4 moles of O2? 4 moles O2 1 mole CO2 = 2 moles CO2 2 mole O2 OR

Steps to solving Mole Ratio problem (one step) Balance the equation Circle given & underline the unknown Convert using mole ratio Circle answer

Using Mole Ratio in Chemical Calculations (one-step) 4 Fe + 3 O2 2 Fe2O3 How many moles of Fe2O3 are produced when 6.0 moles O2 react? 6.0 mol O2 2 mol Fe2O3 = 4.0 mol Fe2O3 3 mol O2

Using Mole Ratio 4 Fe + 3 O2 2 Fe2O3 How many moles of Fe are needed to react with 12.0 mol of O2? 1) 3.00 mol Fe 2) 9.00 mol Fe 3) 16.0 mol Fe

Let’s go back to our grilled cheeses  2 slices of bread + 3 slices of cheese → 1 grilled cheese sandwich I don’t have anymore sliced cheese – I only have a block of cheese that weighs 150g. How many grilled cheeses can I make (1 slice = 10g)?

Let’s go back to our grilled cheeses  2 slices of bread + 3 slices of cheese → 1 grilled cheese sandwich I don’t have anymore sliced cheese – I only have a block of cheese that weighs 150g. How many grilled cheeses can I make (1 slice = 10g)?

New Mole Map GIVEN UNKNOWN grams grams moles moles Divide by Molar mass Multiply by Molar mass Use MOLE RATIO