8th Grade-Ch. 1 Sec. 1 Describing Matter
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Transcript of 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?
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
•eg: cereal
solutionsolution
•well mixed mixture
•eg: sea water
heterogeneous mixture
• can see different parts
homogeneous mixture• substances evenly mixed so
you can’t see different parts• ex: 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