Wednesday, October 14

Objective:

Students will be able to apply the law of conservation of mass to reactions, contrast mixtures and substances.

Quick Chem: Label each as either a chemical change or a physical change.

Paper burning Water freezing Sugar carmelizing Ice melting Crushing rocks into smaller pieces

4 MINUTES REMAINING…

Wednesday, October 14

Objective:

Students will be able to apply the law of conservation of mass to reactions, contrast mixtures and substances.

Quick Chem: Label each as either a chemical change or a physical change.

Paper burning Water freezing Sugar carmelizing Ice melting Crushing rocks into smaller pieces

3 MINUTES REMAINING…

Wednesday, October 14

Objective: Students will be able to apply the law of

conservation of mass to reactions, contrast mixtures and substances.

Quick Chem: Label each as either a chemical change or a physical change.

Paper burning Water freezing Sugar carmelizing Ice melting Crushing rocks into smaller pieces

2 MINUTES REMAINING…

Tuesday, October 13 last chance to view BR - 1 min

Objective:

Students will be able to apply the law of conservation of mass to reactions, contrast mixtures and substances.

Quick Chem: Label each as either a chemical change or a physical change.

Paper burning Water freezing Sugar carmelizing Ice melting Crushing rocks into smaller pieces

30 Seconds Remaining…

10 Seconds Remaining…

TURN IN YOUR BELLRINGER!

October 14, 2009

AGENDA:1 – Quick Chem and

Discussion2 – Quiz3 – Brain POP4 – Cornell Notes5 – Exit Slip

Today’s Goal: To apply law of

conservation of mass, contrast mixture and substance.

HOMEWORK:1. Make vocab

flashcards for the vocabulary from sections 3.2 and 3.3.

Quiz:

1. Define physical change.2. Describe a phase change

and give one example using the water cycle.

3. Define chemical change.4. In your words, state the

law of conservation of mass.

States of Matter Review

Definite shape Indefinite shape Indefinite shape

Definite volume Definite volume Indefinite volume

solid liquid gas

Cornell Notes Ms. Barkume10/14

Review: Chemical vs. Physical ChangesWhat are the main differences between physical and chemical changes?

Example of Physical changes:

Examples of chemical changes:

Melting ice, crumpling paper, freezing water, cutting metal etc.

Any chemical reaction, Metal rusting, fruit ripening, cooking meat, burning gasoline in a car etc.

Summary: Finish as homework.

Physical Change

Chemical Change

Changes a characteristic that can be measured or observed without changing the sample’s composition. Reversible.

Ability to combine with one or more substances to form a new substance.

Ex. Color change, change in temperature, gas is evolved.

Cornell Notes Ms. Barkume10/14

Review: Phase Changes

What are phase changes?

Physical changes that occur between the 3 states of matter.

Summary: Finish as homework.

Solid

Liquid Gas

Free

zing

Mel

tin

gEvaporation

Condensation

Sublimatio

n

Cornell Notes Ms. Barkume10/14

Law of Conservation of MassWhat is the law of conservation of mass?

Example:

Mass can neither be created nor destroyed, only changed.Massreactants (beginning)

= Massproducts(end)

Mass is conserved; products have same mass of reactants.

In a car’s catalytic converter CO reacts with 16 grams of O2 to form 44 grams of CO2. How much CO was reacted?Massreactants= Massproducts

MCO + 16 grams O2 = 44 grams CO2

MCO = 44 grams – 16 gramsMCO = 28 grams

Summary (finish for homework or in class if time permits)

Cornell Notes Ms. Barkume10/14

Law of Conservation of MassWhat is the law of conservation of mass?

Examples:(put these in your notebook. #3 is your exit slip, put on another sheet of paper and turn it into the homework bin before you leave).

Massreactants (beginning) = Massproducts(end)

1. 10.0 grams of hydrogen gas was reacted with 79.4 grams of oxygen to from water. How many grams of water was formed?

2. 15.6 grams of sodium metal (Na) was reacted with an excess of chlorine gas (Cl) to from 39.7 grams of NaCl (table salt). How much Chlorine gas (Cl) was reacted?

3. A 10.0 gram sample of magnesium (Mg) reacts with oxygen (O2) to form 16.6 grams of magnesium oxide (MgO). How many grams of oxygen reacted?

4. Challenge: 106.5 of HCl gas reacted with an unknown amount of NH3 to produce 157.5 grams of NH4Cl. How many grams of NH3 reacted?

Summary (finish for homework or in class if time permits)

Cornell Notes Ms. Barkume10/14

Mixtures and SolutionsWhat are mixtures?

What are types of mixtures?

What are solutions?

Types of solutions:

Mixtures are combination of two or more pure substances where each retains its chemical properties.

Heterogeneous: does not blend smoothly throughout, individual substances remain distinct. (ex. Salad dressing, OJ with pulp)

Homogeneous: Constant composition throughout; a small sample will include all parts of the mixture. (ex. Salt water, air, metal alloys)

Homogeneous mixtures are also referred to as solutions. There is a constant composition throughout. Can be any phase of matter.

Gas-Gas, Gas-Liquid, Liquid-Liquid, Liquid-Solid, Solid-Solid

Summary (finish for homework or in class if time permits)

Exit Slip

Make a VENN DIAGRAM comparing and contrasting mixtures and solutions.

Mixtures Solutions

Percent Error

Percent Error: (Accepted Value – Measured Value) x

100 Accepted Value

Example: Accepted value = 1.2 Measured value = 1.3 (1.2 – 1.3) x 100 = 8.3 % 1.2Actual Density of H2O = 1.00 g/mL

Steps of Inquiry

Ask a QUESTION

Make a PROCEDURE

Interpret RESULTS

Make a Conclusion

Guides

Influences (data)

Using data to:

Quiz (10 pts)

What is the volume of water in the graduated cylinder? Measure to 2 figures (numbers)

Density

Density is a physical property of matter.

Defined as the amount of mass per unit of volume.

Density = mass (grams)volume (mL)

Reading Graduated Cylinders

Graduated cylinders are used to measure volume of liquids.

How much liquid is the graduated cylinder?

Reading Graduated Cylinders

Graduated cylinders are used to measure volume of liquids (in mL).

How much liquid is the graduated cylinder? The curved line is

the meniscus. Read the volume from the bottom of the curve.

The volume of the liquid is 35 mL.

Reading Graduated Cylinders

Graduated cylinders are used to measure volume of liquids (in mL).

To read, find the lines labeled with numbers

Count the steps between Divide

10/10 =1

Every tick mark is 1mL

Reading Graduated Cylinders

Read at the meniscus10/10 =1

Every tick mark is 1mL

Volume = 35 mL

1/5 = 0.2

Every tick mark is 0.2 mLVolume

is 6.2 mL

Types of Data• Data does not equal scientific evidence• Previous knowledge + DATA = Scientific

Evidence• Qualitative Data: information that describes color,

odor, shape, or some other physical properties• Quantitative Data: Numerical information that

tells you how much, how little, how big, how tall or how fast.

• Data Tables organize data for display and understanding.

September 14, 2009

AGENDA:1 – Quick Chem and

Discussion2 – Get in lab groups3 – Safety Activity4 – Data and Data

Tables5 – Wrap Up

Today’s Goal: To understand the

importance of lab safety and lab safety rules

HOMEWORK:1. Complete lab

safety worksheet

Data Table

Data Tables display data Previous knowledge + DATA = Scientific

Evidence Qualitative Data: information that

describes color, odor, shape, or some other physical properties

Quantitative Data: Numerical information that tells you how much, how little, how big, how tall or how fast.

Understanding Lab Safety

• You should NEVER try to taste any of the substances.

• You should ALWAYS wear your lab goggles. Some of the lab materials are skin, eye irritants.

• Always dispose of the laboratory materials appropriately.

• Wear appropriate clothing and shoes.• REMEMBER the class rule: FOLLOW

DIRECTIONS!