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Page # Counting Atoms/Balancing Equations October 22, 2012

S Starter2C9H8O4 C7H5(NO2)3

4Ca(H2PO4)2 FeS2HOMEWORK FOR TONIGHT: BALANCED?

WORKSHEET DUE TOMORROW!!!

P Law of Conservation of Masses• Established in 1789 by French Chemist Antoine

Lavoisier • States that mass is neither created nor destroyed in

any ordinary chemical reaction. • Or more simply, the mass of substances produced

(products) by a chemical reaction is always equal to the mass of the reacting substances (reactants).

Video Representation

P PracticeWhat steps do we take to balance equations?1. Write out the different atoms2. Count the atoms on the reactant and product sides3. Circle the unbalanced atoms4. Start with the lowest and add coefficients to balance out.

Balance the following:Al + MnO Al2O3 + 3 Mn

A ApplyBalancing Act Worksheet

C Connection What questions do I still have about counting atoms and balancing equations?

E Exit½ page reflection on what

you learned today. Make sure to use key words such as chemical equation, atoms, coefficient, subscript, etc.

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Page # Balancing Equations Cont October 23, 2012

Starter: Is this balanced? If not fix it.

UF4+ Mg→ U+ 2MgF2

• P- Balancing Act Corrections• A- Teach a Friend (You will be given an equation

strip you will teach your friend how do to the equation using a white board). You will go through each step to successfully balance the equation.

• C- Balanced? Worksheet (If you do not finish its for homework)

• E- What part of todays lesson benefited you the most? Explain why?

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Page # Chemical Reactions Group Discussion October 24, 2012

S StarterWhat is the purpose of a

coefficient and a subscript in a chemical formula?

Practice

• Let’s go over the clues that tell you a chemical reaction is

occurring.

Application

• There are 4 activities that you will be completing with your group.

• You have 5-7 minutes for each station.

• Read the article and write the questions and answers in your

Journal.

Connection• Write and example of a chemical reaction

that you can find in your household.

Exit• Write a ½ page reflection about what you

learned today.

10.25.12 Dropping Out Lab

S: What is so funny about this joke?

Two scientists walk into a bar...The first one says “I’ll have some H2O.” The

second says “I’ll have some H2O too.” Then he dies.

The second guy says H20 (too) as in H202 (meaning hydrogen peroxide) Hydrogen peroxide is a very unstable substance and

highly reactive. It will kill you.

Dropping Out Lab Introduction

In this investigation, you will observe the mixing of Epsom salts with household ammonia. These are both substances that dissolve in water. Mixing ammonia and Epsom salts produces magnesium hydroxide as one of the products. Magnesium hydroxide is a white substance that does not dissolve well in water.

P:

Dropping Out Lab Materials

250 mL Beaker 10 mL Ammonia100 mL WaterSafety Goggles5 g Epsom Salt

StirrerTimerGraduated

CylinderBalance

P:

Dropping Out Lab Procedures

• 1. Put on your safety goggles. Wear goggles throughout the investigation.

• 2. Pour 100 mL of water in the beaker.

• 3. Measure 5 g of Epsom salts. Describe the properties of the Epsom salts.

• 4. Add the Epsom salts to the water in the beaker, and stir until completely dissolved.

P:

Dropping Out Lab Procedures

• 5. CAUTION: Be very careful when working with chemicals. DO NOT waft or smell the ammonia. It could be HAZARDOUS to your nose and lungs. Ammonia has a sharp, strong odor. It can irritate the eyes and nose membranes.

• 6. Slowly add 10 mL of ammonia at the very edge of the beaker. DO NOT STIR.

• 7. Allow the beaker to sit undisturbed for at least five minutes. Observe the reaction, and describe what is occurring in your journal. (More time will be required.)

P:

Dropping Out Lab

• Complete #1-7 then clean up your area and return goggles and aprons.

•Sit at your desk and answer #8-9 in your journal.

A:

Lab Analysis

1. What do you predict will happen when the Epsom salts and the ammonia are mixed? 2. What type of changes do you think will take place? Which parts were physical changes and which chemical reactions? 3. What do you think the

precipitate will look like?

C:

Lab Report

Write a one-paragraph summary of the investigation by using your data/observations and notes. Create a hypothesis of what you think will

occur tomorrow.

E: