Physical Changes

•Don’t _____ with ______

substances

• Often __________ to

undo

Chemical Changes

•_______ with ______

substances

•______ cannot be

__________

Chemical vs. Physical Changes

CHEMICAL CHANGES PHYSICAL CHANGES

Example Reason Why Example Reason Why

Place these in your chart and explain…

Burning paper

Cutting wire into 5 pieces

Ice melting in a glass of soda

Chlorophyll in a leaf changing the

color

Adding food coloring to water

Burning gasoline inside a car engine

Dissolving sugar in iced tea

Spilled gasoline evaporates

Silver coin tarnishes in the air

Chemical vs. Physical Changes

CHEMICAL CHANGES PHYSICAL CHANGES

Example Reason Why Example Reason Why

Burning

paper

Cutting wire

Chlorophyll

turning leaves

colors

Food coloring

makes water

blue

Gasoline

burning

Ice melting

Silver

tarnishing

Sugar dissolving

Gasoline

evaporating

Baking Powder

Baking Soda

Cornstarch

Sugar

W

a

t

e

r

v

i

n

e

g

a

r

I

o

d

i

n

e

Changes:

C (chemical)

P (physical)

Properties:

R (reactivity)

S (solubility)

Physical VS Chemical Properties

•Look at the chart on page 16 of your

textbook:

What do you notice when you compare

the chemical and physical properties of

the substances?

Changes:

C (chemical)

P (physical)

Properties:

R (reactivity)

S (solubility)

Conclusion:

Physical Properties

Examples

Chemical Properties

Examples

Physical Changes

Examples

Chemical Changes

Examples

How were these demonstrated

in lab?

Archimedes Crowning Glory

Explain in detail how Archimedes was able to tell

that the crown was not made of pure gold. You

may use the information from the density gizmo

to help.

1. Finish and turn in density gizmo

2. Read pages 12-14 and code text:VIP-Very important point; I need to know this; This supports the

main idea

?-Question; I’m curious or confused; I wonder why…

Ɵ-Text feature; This picture shows key information

Hmm…Watch the video clip.

What physical property were the scientists using to lift the ship?

Was it successful? Why or why not?

http://www.youtube.com/watch?v=lKKu0DA5lvMhttp://www.youtube.com/watch?v=lKKu0DA5lvM

Demos…

Make some qualitative observations.What happened? Explain.

Demos…

Demos… (Before)

Make some qualitative observations.What do you think will happen?

Explain.

1.Take out your “Introduction to

Matter Review Sheet”

2.What are 2 things you learned

in this section?

3.What is 1 thing you don’t

understand?

1.Is it a chemical or physical

change when you make

scrambled eggs? Why?

2.If I mix baking soda with

vinegar and a gas is produced,

is that a chemical or physical

change? Why?

1.Take out your “Take out your

“Physical and Chemical

Changes” paper you just

completed. (its ½ sheet of

paper)

Chemical and Physical Changes

Physical Change

Chemical Change

Raw Egg

Pencil

Antacid Tablet

Metal Bicycle Frame

Demos…(After)

Make some qualitative observations.What happened? Why?

Re-read page 19 in your textbook

Use post-it flags to mark any information as per the

box above.

Look at the second chart for “White Before Your

Eyes”.

Make sure you have the correct changes, chemical

or physical, and the correct properties, reactivity or

solubility.

Demos…

What is happening in the flask? Why-is it a chemical change or

a physical change? Explain.

1.What is the

difference between a

chemical change

and a physical

change?

1.Why did the bubbles float in

the aquarium experiment?

2.Which of the silver balls do you

think has a greater density (the

larger or the smaller)? Why?