PHYSICAL AND CHEMICAL

PROPERTIES AND CHANGES

Write down the answers to the following questions on a piece of notebook paper. This will be collected at the end of class for part of your daily grade

1. How do you decide whether a sample of matter is a solid, liquid or gas (describe in terms of shape, volume, compressibility and particles)

2. How is a solid similar to a liquid?3. How is a liquid similar to a gas?4. Assemble fl ip book (see sample at the front of

the room)

CATALYST (10 MIN)

SWBAT distinguish between the physical properties and chemical properties of matter

SWBAT describe physical and chemical changes and classify changes of matter as physical or chemical

OBJECTIVES

I do: lecture and frayer notesWe do: distinguish between physical and chemical properties and changes on white boards

You do: work with partners and classify the changes and properties of different substances

AGENDA

Example(s)

        Characteristic(s)/Fact(s)  

                         Illustration

Definition

VOCABULARY WORD

Definition:A characteristic

that can be observed or measured without changing the sample’s composition

Characteristics:Describes the

substance itselfCan be

determined by viewing, touching or measuring the substance

PHYSICAL PROPERTY

Examples:Melting/boiling pointDensityElectrical and heat

conductivityColor Size or massLuster (shine)OdorHardness or

BrittlenessTemperature

PHYSICAL PROPERTY

Intensive properties:Independent of

the amount of substance present

Extensive properties:Dependent upon

the amount of substance present

INTENSIVE VS. EXTENSIVE PHYSICAL PROPERTY

Definition:Ability of a

substance to combine with or change into one or more other substances

Characteristics:Cannot be

determined just by viewing or touching the substance

Internal structure of the substance must be changed to observe the property

CHEMICAL PROPERTY

Examples:Chemical stabilityFlammabilityHow easily it

reacts with other substances

CHEMICAL PROPERTY

Definition:Changes which

alter a substance’s physical appearance but the composition remains unchanged

Characteristics:Can involve a

change of stateDoes not change

what the substance is

PHYSICAL CHANGE

Examples:Hair cutBoiling, freezing

or melting a substance

Sugar cube dissolving

PHYSICAL CHANGE

Definition:Change in which

a substance is transformed to one or more new substances with altered compositions

Characteristics:Involves a

chemical reactionChanges color,

smell, energy, formation of gas, precipitate and/or light

CHEMICAL CHANGE

OBSERVABLE FACTORS OF A CHEMICAL CHANGE

Examples:FireworksBurning coalIron rustingScientist

breaking water into oxygen and hydrogen gas

CHEMICAL CHANGE

PHYSICAL VS. CHEMICAL CHANGE

Physical Change Chemical Change

Does not involve changes in identity of a substance

Change the identity of the substance

Cause a change in state or shape

Involves a chemical reaction, Causes a change on a molecular level

Sometimes reversible Not reversible

Does not yield a product Produce gases, solids, liquids, energy and color changes

MERCURY OXIDE -> OXYGEN + MERCURY

WE DO: GRAB A WHITE BOARD FOR

YOUR GROUP

IDENTIFY WHETHER THE FOLLOWING ARE

PHYSICAL OR CHEMICAL CHANGES

AND USE YOUR NOTES TO EXPLAIN

WHY

LIGHTING A MATCH

CRUSHING ALUMINUM CANS

DIGESTING FOOD

TWO CANS OF PAINT MIXED TOGETHER

USING HOT GLUE

MIXING BAKING SODA AND VINEGAR

WATER FREEZING AND FORMING ICE

IDENTIFY WHETHER THE FOLLOWING ARE

PHYSICAL OR CHEMICAL

PROPERTIES AND USE YOUR NOTES TO

EXPLAIN WHY

SILVER TARNISHES WHEN IT COMES IN

CONTACT WITH HYDROGEN SULFIDE

IN THE AIR

A BANANA IS YELLOW

A SHEET OF COPPER CAN BE POUNDED

INTO A BOWL

GASOLINE IS FLAMMABLE

AN APPLE WILL TURN BROWN IF LEFT IN

OXYGEN

ACID IN TOMATO SAUCE CAN

CORRODE ALUMINUM FOIL

BARIUM MELTS AT 725 C

A SHEET OF COPPER CAN BE POUNDED

INTO A BOWL

Read the packet and identify the physical and chemical properties and changes of the substance

Make a table to record your answers

YOU DO: IDENTIFY CHEMICAL AND PHYSICAL PROPERTIES AND

CHANGES

Classify the following as chemical change (cc), chemical property (cp), physical change (pc), or physical property (pp). Explain WHY for each answer. 

HOMEWORK # 2

1.  Heat conductivity2. Combustible3. Silver tarnishing4. Water freezing5. Melting ice6. Wood burning7. Iron rusting8. Density of a coin

9. Length of a metal object

10.Brittleness11.Color12.Cutting grass13.Exploding dynamite14.Baking bread

Tyreke made the following statement when speaking to his lab partners:

"Breaking a rock into several pieces is an example of a chemical change. When I started, I had one substance (a rock). At the end, I had several different substances (the different sized pebbles).“

Assess the validity of his claim and justify your reasoning.

HOT QUESTION 1

Water (H2O) is made of Hydrogen (a gas) and Oxygen (also a gas). Water is a liquid at room temperature. Based on this, it seems like hydrogen and oxygen combining to form water is a physical change (gases turning into solids). Do you agree with this assessment? Why or why not?

HOT QUESTION 2

Chlorine is a yellowish gas at room temperature that reacts easily with sodium (a shiny silver metal) to form sodium chloride (NaCl-- table salt). Ingesting either chlorine or sodium alone will kill you. Ingesting table salt alone will just make you thirsty. Using your knowledge of physical and chemical changes, discuss whether you believe the formation of NaCl is more of a physical change or a chemical change.

HOT QUESTION 3