Catalyst1. Pick up papers from front.2. Answer the Catalyst below:

1. Problem 1 from yesterday (Ch. 4 Supp problems)!

GRADE!

Catalyst

Take out your catalyst sheet and answer the questions below by naming the following compounds:

A) 0.137 g Hydrogen PeroxideB) 0.303 g Lead (II) Sulfate

BIG GOAL

Explosion!(3 MINUTES)

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Explosion Questions1. What is the scientific method?2. What is a Law?3. What is a theory?4. What is the formula for

density?5. What is a chemical property?6. What is a physical property?7. What is the law of

conservation of mass?8. What is the law of definite

proportions?9. What is the law of multiple

proportions?10. What is precision?11. What is accuracy?12. Where can I find a fire

extinguisher?13. Who discovered the electron?14. What are the three types of

radiation?15. Which particle is the biggest?

16. Which is the smallest?17. Who is Ernest Rutherford?18. Is the atomic mass or atomic

number always bigger?19. How do you find the number of

neutrons?20. What is an isotope?21. What is the formula for

Nitrate?22. What is the formula for

Chlorate?23. What is the formula for

Sulfate?24. What is a covalent compound?25. What is an ionic compound?

Calculating the amount of reactant or product

Let’s say we are making a sandwich! In order

to have a complete and delicious sandwich we

need:• 2 slices of bread• 3 slices of Ham• 5 tomatoes• 4 cucumbers• 1 pickle

How many sandwiches can you make with:

• 6 slices of bread• 9 slices of Ham• 15 tomatoes• 12 cucumbers• 3 pickles

3 Sandwiches!

Let’s say we are making a sandwich! In order

to have a complete and delicious sandwich we

need:• 2 slices of bread• 3 slices of Ham• 5 tomatoes• 4 cucumbers• 1 pickle

If you have 4 slices of bread,

how many slices of Ham

would be needed?

6 slices of Ham!

Let’s say we are making a sandwich! In order

to have a complete and delicious sandwich we

need:• 2 slices of bread• 3 slices of Ham• 5 tomatoes• 4 cucumbers• 1 pickle

If you have 1 mole of pickles,

how many moles of

Tomatoes would be needed?

5 moles of Tomatoes!

Mole Ratio: the Ratio of one compound to another in a

chemical reaction

Ex. CH4(g) + O2(g) CO2(g) + 2H2O(l)

The Mole Ratio of O2 to H2O is 1:2

What is the mole ratio for SeCl6 to Cl2?

1:3

SeCl6 + O2 SeO2 + 3Cl2(g)

Amounts of Reactants and Products

Steps: 1. Balance the equation for the reaction 2. Convert the known mass of the reactant or

product to moles of that substance3. Use the balanced equation to set up mole

ratios4. Use mole ratios to calculate number of

moles of the desired reactant or product5. Convert moles to grams if necessary

We know every calculation for a chemical reaction MUST go through moles!

Mass of A MOLES

Atoms/molecules of A

Atomic mass/molar mass of A

Avogadro’s #

Mass of B

Atoms/molecules of B

Atomic mass/molar mass of B

Avogadro’s #

Use MOLE RATIO OF A

to B

Let’s Try this out!

Example 1: Solid lithium hydroxide is used in space vehicles to remove exhaled carbon dioxide from the

living environment by forming solid lithium carbonate and liquid water. What mass of gaseous carbon dioxide

can be absorbed by 1.00 kg of lithium hydroxide?

Steps: 1. Balance the equation for

the reaction 2. Convert the known mass

of the reactant or product to moles of that substance

3. Use the balanced equation to set up mole ratios

4. Use mole ratios to calculate number of moles of the desired reactant or product

5. Convert moles to grams if necessary

Example 1: Solid lithium hydroxide is used in

space vehicles to remove exhaled carbon dioxide from the living

environment by forming solid lithium carbonate and liquid water. What mass of gaseous carbon

dioxide can be absorbed by 1.00 kg of

lithium hydroxide?

Let’s Try this out!

Baking soda (NaHCO3) is often used as an antacid. It neutralizes excess hydrochloric acid secreted by the stomach

to form sodium chloride, water and carbon dioxideMilk of magnesia (Magnesium hydroxide) is also used as an

antacid to produce water and magnesium chloride.

Which is the more effective antacid per gram baking soda or Milk of Magnesia?

Step 1: Write out the reactions!

Let’s Try this out!

Try Supp Ch. 4 Problem 1

Limiting Reagant

Let’s say we are making a sandwich! In order

to have a complete and delicious sandwich we

need:• 2 slices of bread• 3 slices of Ham• 5 tomatoes• 4 cucumbers• 1 pickle

If you have 8 slices of bread, 6 slices of Ham, 15

tomatoes, 10 cucumbers and 2 pickles how many

complete sandwiches can you make?

2 complete sandwiches!

Let’s say we are making a sandwich! In order

to have a complete and delicious sandwich we

need:• 2 slices of bread• 3 slices of Ham• 5 tomatoes• 4 cucumbers• 1 pickle

If you have 8 slices of bread, 6 slices of Ham, 15

tomatoes, 10 cucumbers and 2 pickles how many

complete sandwiches can you make?

2 complete sandwiches!

How did you get 2, not 3?

Which reactants were limiting?Ham and pickles!

Limiting Reagant: reactant that is consumed first and therefore limits the amount of products that can be

formed

Excess Reagant: reactant that is not consumed and therefore has

leftover reactant when the products are formed

Let’s Try this out!

Nitrogen gas can be prepared by passing gaseous ammonia over solid copper (II) oxide at high temperatures. The other products of the reaction are solid copper and water vapor. If a sample containing 18.1 g o NH3 is reacted with 90.4 g of Copper (II) oxide, A )which is the limiting reactant?B) How many grams of N2 will be formed??

Step 1: Write and balance out equation!

Let’s Try this out!

Try Supp Ch. 4 Problem 2a-c

% Yield

Theoretical Yield: The amount of product formed if the limiting

reactant is completely consumed. (This is calculated)

This is the MAXIMUM amount of product that can

be formed.

Actual Yield: The REAL amount of product formed during the reaction.

(This is from experimentation)

The actual yield is usually represented as a % of the theoretical amount (aka %

YIELD):

Let’s Try this out!

Methanol (CH3OH), also called methyl alcohol is the simplest alcohol. It can be used as a fuel in race cars and is a potential replacement for gasoline. Methanol can be manufactured by combination of gaseous carbon monoxide and hydrogen. Suppose 68.5 kg Carbon monoxide is reacted with 8.60 kg of hydrogen gas. A) Determine the Limiting ReactantB) Calculate the theoretical yield of methanolB) If 3.57x104 g methanol is actually produced, what is the % yield

of methanol?

Let’s Try this out!

PRACTICE Ch 4 Supp #3!