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### Chapter 4 Section 3

How much gas is produced?

Stoichiometry (def)

- The study of the relationships or ratios between two or more substances undergoing a physical or chemical change

Investigate, Part A

- Grab a bag of pennies from the teacher—do no open the bag of pennies!
- You will also get a penny—don’t lose this.

- The scales are around the room.
Answerquestions 1 a-c

Do Now

I give you a bag of M&M’s. Knowing what you know in class, you weigh the bag with the M&M’s and it comes out to be about 350g. You then weigh one M&M and it comes out to be 0.75g. You then eat the M&M’s and you find that the bag itself weights about 1.3g.

- How many M&M’s were there?

Investigate Part A

- For number 2a, find the rule

Investigate Part A

- For number 3, read through the paragraphs and answer letter a
- Once completed, complete number 4
- Read through number 5.

4/16/12 Warm Up

I have a bag of peanuts that weighs 70000g. If I weigh one peanut and it is 0.6g, how many peanuts do I have? (The bag weighs 25g)

What are some examples…

- Write out a domino for the following conversions:
- 1 day = 24 hours
- 1 hour = 60 minutes
- 1 g of water = 1mL of water
(remember to include units!)

The mole…

- The mass of one atom is too small to measure
- So we use one mole of atoms to make a calculation
- 1 atom of H = 1 amu
- 1 mole of H = 1 g

Investigation

- Answer 7 a-d knowing what we just went through.
- When finished, make DOMINOES for each of them.

Investigate Part A

- When you have a molecule, you must find all the individual components….
H2O

- 2 atoms of Hydrogen
- 1 atom of Oxygen

Investigate, Part A

- Complete number 8 on p. 276 (you have 5 minutes)

Investigate, Part A

- When you have a molecule, you must add up all the individual components to find the mass:
H2O = 18 amus

- 2 atoms of Hydrogen (1 amu each, so 2 amus)
- 1 atom of Oxygen (16 amu each, so 16 amu)

Investigate, Part A

- Complete number 9 on p. 276

4/17/12 Warm Up

For the next few problems, use CaCO3

- How much of each individual atom is present in the molecule?
- How much does one mole of this compound weigh?

Investigation, Part A

- Do number 10 a-c on p. 276.
- Use the example of water to help you!

Investigate, Part A

11 a:

Investigate, Part A

Complete 11 b-d (looks similar to what you see)

Only use the dominoes from the previous problem!

Investigate, Part B

- Read aloud number 1
2AgNO3 + CaCl2 2AgCl + Ca(NO3)2

Investigate, Part B

- Read aloud number 1
2AgNO3 + CaCl2 2AgCl + Ca(NO3)2

If I have 5 moles CaCl2 How many moles of AgCl do I have?

If I have 5 moles AgNO3 How many moles Ca(NO3)2 do I have?

Investigate, Part B

- You have 5 minutes to answer 1 a-d
- Remember, make dominoes like the one on the last slide!

3/18/12 Warm Up

If I have 3 moles of NaNO3, how many grams are present?

If I have 38g of NaNO3, how many moles are present?

Use the following equation to solve the problem:

Ba(NO3)2 + 2AgCl BaCl2 + 2AgNO3

If I have 3 moles of Ba(NO3)2, How many moles of AgNO3 are produced?

4/23/12 Warm Up

For the next few problems, use the equation below:

2KClO3 2KCl + 3O2

If I react 4 moles of KClO3, how many moles of KCl will I get as a product?

How many moles of O2 will I then get?

Investigate, Part C

- Read aloud number 1 on p. 277
- You can use dominoes to calculate the amount of gas!

Examples

- 1a: How many liters will 4 moles of hydrogen gas occupy?
- 1b: If an oxygen balloon fills 11.2L, how many moles of O2 are in it?
- Complete 1c on your own!

Investigate, Part C

- Read aloud and complete number 3 together.

1) Simple One-Step Problems:

If I have 7 g of H2O, how many moles do I have?

1) Simple One-Step Problems:

If I have 7 moles of CaCO3, how many grams do I have?

1) Simple One-Step Problems:

If I have 7 moles of H2O (g), how many Liters do I have?

2) (more) Complex Multistep Problems

In the following reaction:

2H2 + O22 H2O

1) If I start out with 8 g of H2, how many moles of H2O do I end up with?

2) How many g of H2O

2) (more) Complex Multistep Problems

In the following reaction:

2 Na (s) + Cl2(g) 2 NaCl (s)

1) If I start out with 8 g of Na, how many moles of Cl2 do I end up with?

2) How many g of NaCl?

Summary

- Essential Questions, p. 283
--How do you know?

--Why do you believe

--Why should you care

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