Chapter 4 Section 3

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Chapter 4 Section 3 . How much gas is produced?. Date: HW: CTG p. 285 # 3 -8. Do Now: WDYS, WDYT p. 274 Agenda: WDYS, WDYT Investigate: part A. Stoichiometry ( def ). The study of the relationships or ratios between two or more substances undergoing a physical or chemical change.

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Chapter 4 Section 3

How much gas is produced?

Date:HW: CTG p. 285 # 3-8

Do Now:

WDYS, WDYT p. 274

Agenda:

WDYS, WDYT

Investigate: part A

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.

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
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.
Investigate, Part A

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

Only use the dominoes from the previous problem!

Investigate, Part B

2AgNO3 + CaCl2 2AgCl + Ca(NO3)2

Investigate, Part B

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 + O22 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