8th grade-ch. 1 sec. 1 describing matter

Ch. 1 Sec. 1

Describing Matter

Object Description (color, texture, shape,etc.)

1. Describe 9 of the objects.

Describing Matter Activity

Silver Round Flexible 2. Classify the objects into 3 categories.

matter•anything that has mass & takes up space

chemistry•study of properties of matter & how matter changes

substancesubstance• Single kind of matter that is pure• Has specific:makeup or composition set of properties• ex: salt, sugar

2 kinds2 kinds of propertiesof properties

physicalproperty

chemical property

can be observed

w/out changing it into another substance

new materials are formed

examples:•hardness

•texture•color

•flexibility

example:•flammability

•ability to react

What are the frog’s physical properties?

What are the frog’s chemical properties?

What are the frog’s chemical properties?

element

•Pure substance cannot be broken down into any other substances by chemical or physical means

ALL MATTER IS MADE OF ELEMENTS.

atom

•basic particle from which elements are made

Elements: One Kind of Atom [01:14]

chemical bond

•force of attraction between 2 atoms

molecule•2 or more atoms held by chemical bonds

Molecules: More Than One Kind of Atom [00:30]

ACTIVITY-MAKING MOLECULES

1.1. HH22O

2. CO2

3. C2HH44

4. CClCl44

5. C4HH1010

6. CHH33

7. CHH33OOHH

8.8. HHCO2HH

Blue- Nitrogen- NBlue- Nitrogen- N

Yellow- Hydrogen- Yellow- Hydrogen- HH

Black- Carbon- CBlack- Carbon- C

Green- Chlorine- ClGreen- Chlorine- Cl

Purple- Iodine- IPurple- Iodine- I

Flourine- FFlourine- F

Red- Oxygen- ORed- Oxygen- O

Orange- Bromine- BrOrange- Bromine- Br

compound• Pure substance made of 2 or

more elements chemically combined in a set ratio

• Represented by chemical formula- shows ratio of elements

CO2

H2

O

Compounds and their Proportions

mixture•2 or more substances that are mixed together but not chemically combined

•cereal

solutionsolution

•well mixed mixture

•sea water, lemonade

heterogeneous mixture

• can see different parts

homogeneous mixture• substances evenly mixed so

you can’t see different parts• solution

Heterogeneous and Homogeneous Mixtures [01:16]

Activity- Separating a Mixturecorn Chex

wheat Chex

Round pretzels

Bread-sticks

Bagel chips

Window-pane pretzels

Classify each item as either an element (E), a compound (C), or a mixture (M). You may also use your textbook and the periodic table to help

you identify elements.

1.water 2.hydrogen 3.soup 4.soil 5.diamond 6.sugar 7.sulfur

15.iron 16.brass 17.sausage 18.cement 19.oxygen 20.chop suey 21.air

8. iron sulfide 9. mercury 10.nitrogen 11.salt 12.bread13.gold14.aspirin

Classify each item as either an element (E), a compound (C), or a mixture (M). You may

also use your textbook and the periodic table to help you identify elements.

1.water C 2.hydrogen E3.soup M4.soil M5.diamond E6.sugar M7.sulfur E

15. iron E16.brass C17.sausage M18.cement M19.oxygen E20.chop suey M21.air M

8. iron sulfide C9. mercury E10.nitrogen E11.salt C12.bread M13.gold E14.aspirin C