Chapter 7 Lesson 1
 What

is it?
Anything that has mass and takes up space
(volume)
 How
do you classify matter?
 Would
air, feelings, motion, time, or fire
classify as matter?
If light, sound, force, and energy are not
matter, how do we know anything about
them?
 unique
structure of atoms determines the
properties of matter
 http://app.discoveryeducation.com/search?
Ntt=atoms+matter+
 combination
of atoms that is always the
same

 If
sugar, aluminum, oxygen
you have a glass of pure water from a
spring in Canada and a glass of pure water
from a pond in California, would the
arrangement of water atoms in each glass be
the same or different? Explain.
a
substance
 consists of just one type of atom


115 known elements = 115 different types of
atoms
Each type contains a different number of protons
(atomic number)
 most
elements exist as individual atoms
 some exist in groups (oxygen – pairs)

Still contains only one type of atom
Atoms with more than 92 protons in their
nucleus aren’t stable, so scientists synthesize
them artificially by colliding two atoms
together. These super-large atoms break
down extremely quickly.
Do you think most of the materials in the world
are pure elements, or are they made up of a
combination of elements?
 substance
 two
or more different elements
 chemically bonded together
 Carbon Dioxide CO2


1 atom of carbon (C)
2 atoms of oxygen (O)
 Carbon


Monoxide: CO
1 atom of carbon
1 atom of oxygen
 What
does a chemical formula, such as CO,
show?
 How
 Are
do you know NaHCO3 is a compound?
the properties of one compound always
different from every other compound?
 Matter
that can vary in composition
 Two or more substances
 Physically blended together

Beach: sand and water
 Can
be separated
 Heterogeneous



Mixtures
Individual substances are not evenly mixed
Substances do not mix completely
Different samples of a mixture can contain
different amounts of the same substances
 Homogeneous



Individual substances are evenly mixed
Different samples of a mixture will have same
combinations of same substances
Individual particles are not visible


Mixtures
Small and well-mixed
Also known as a solution



Solvent – largest amount
Solutes – smaller amounts
Solutes dissolve (mix evenly) in the solvent
How is a compound different from a solution?
What is the chemical formula for salt water?