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Chapter 14 Composition of Matter
Compounds
17
Science
6th Grade
09/22/2010

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Term
What is a pure substance?
Definition
always has the same composition and properties.
Term
What are the two types of pure substances?
Definition
elements and compounds
Term
What is a compound?
Definition
is a pure substance that is made up of two or more elements that are chemically combined.
Term
What is the chemical formula?
Definition
an abbreviation that shows how many atoms of an element exist in a compound.
Term
EXAMPLE #1-


Carbon Atom- ?
Oxygen Atom- ?
Formula- ?
Definition
1. 1
2. 1
3. CO
Term
EXAMPLE #2-


Carbon Atom- ?
Oxygen Atom- ?
Formula- ?
Definition
1. 1
2. 2
3. CO2
Term
EXAMPLE #3-
(Nail Polish)


Carbon Atom- ?
Hydrogen Atom- ?
Oxygen Atom- ?
Formula- ?
Definition
1. 3
2. 6
3. 1
4. C3H6O
Term
EXAMPLE #4-


Hydrogen Atom- ?
Oxygen Atom- ?
Formula- ?
Definition
1. 2
2. 1
3. H2O
Term
All matter can be classified as either...?
Definition
a pure substance or a mixture
Term
Pure Substance-
Definition
has a definite composition and the same compositon and properties regardless of where it comes from.
Term
Mixture-
Definition
will be different every time. Ex- take one handfull of trail mix and sort them out. Take another handful and it will not be the exact same.
Term
The properties of a compound are usually different from the properties of the elements it is made up of.
Definition
Term
In a mixture, the component parts keep their properties. You can use those properties to separate a mixture.
Definition
Term
Elements that combine to form compounds usually do not keep their original properties.
Definition
Term
What is a chemical bond?
Definition
a force of attraction between atoms or ions. Once a compound forms, only another chemical change breaks the bond.
Term
What are the two common types of chemical bonds?
Definition
covalent bond and the ionic bond
Term
How is a covalent bond formed?
Definition
when two atoms share their outermost electrons. A group of two or more atoms held together b covalent bonds is called a molecule.
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