WE WILL NOW BE STARTING ON
CHEMISTRY TOPICS!
WHAT IS CHEMISTRY?
 WHAT DOES IT HAVE TO DO WITH OUR LIVES?
 Take this time to fill out the KWL (Know, Want to
Know, Learned) on what you know and want to
learn about CHEMISTRY
CHEMISTRY: The study of what things are made of,
their properties, and how they interact and change.
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Chapter 1 Test
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2st Period
Average: 30/44
High Scores: Logan* and Madi
3rd Period
Average: 31/44
High Scores: Mercedes and Ceara
4th Period
Average: 32/44
High Scores: Danny C, Ethan*, Haylie, and Sam
WHAT IS MATTER
AND WHY DOES IT
MATTER?
CHAPTER 2 - MATTER
What is Matter?
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Anything you can hold or touch is matter.
Matter is anything that has mass and occupies space
(volume).
Examples include you, your friends, and the table
you are sitting at.
Is It Matter
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Oxygen
The Air you breathe
Light
A rock
The moon
Light
What is Matter Made of?
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Atoms are the building blocks of all matter.
There are many different kinds of atoms, 117 in all.
These different kinds are called elements.
By combining these we get every known matter.
What element are these made of?
What is the Human Body Made Of?
How does it work?
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Elements combine to form compounds
Example: Nylon – made up of carbon, hydrogen,
nitrogen, and oxygen atoms
Compounds have unique properties, every
compound is different from the elements that make
it.
The elements that form nylon are gases, yet when
combined they produce a flexible solid
Molecules
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Atoms can also combine to form molecules.
A molecule is the smallest unit of a substance that
keeps the same physical and chemical properties.
Example: Water – made up of two hydrogen atoms
and one oxygen atom (H20). These elements join
together to form a unit so that each water molecule
is uniform
Chemical Formulas
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We use chemical formulas to represent compounds
and our molecules.
A chemical formula shows how many atoms of each
element are in a unit of a substance
Example H20
What we have so far?
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Everything that has mass and volume is matter.
Matter is made up of atoms.
Two or more different types of atom equals a
compound.
Atoms combine to form molecules which act as a unit
What do compounds and molecules form to make?
Pure Substances and Mixtures
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Pure substances have a fixed composition and
definite properties. Example is water.
Mixture is a combination of pure substances.
Example is salt water
A mixture can be separated into its core
components without a chemical change while a pure
substance cannot.
Pure Substance or Mixture
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A block of Iron
The air we breathe
A glass of water
A glass of orange juice
Mixtures
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Are formed by mixing pure substances.
Mixtures are classified by how thoroughly the
substances mix.
 Homogeneous
mixtures-mixture is same throughout.
 Heterogeneous mixture-mixture is not the same
throughout.
Heterogeneous or Homogeneous
Review
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Matter is anything with mass and a volume.
Matter is made up of atoms.
Atoms make up molecules and compounds.
Molecules and compounds make up mixtures and
pure substances.
Mixtures are either homogeneous or heterogenous.