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What is Chemistry?

What is Matter?

How Can We Study Matter
When There is So Much of It?

How Can We Study Matter
When There is So Much of It?

Matter can be . . .

Separation of a
Homogeneous Mixture

Separation of a
Heterogeneous Mixture

When a Mixture is
Separated . . .

Example of a Physical
Change

Example of a Chemical
Change

Mixtures vs. Compounds

Evidence for the Atomic
Theory

Definite / Multiple
Proportions

Conservation of Mass

Discovery of the Electron

Slide 16

Charge of the Electron

Plum Pudding Atom

A Test of the
“Plum-Pudding Hypothesis”

Nuclear Model of the Atom

Slide 21

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What is
Chemistry?

•

The study of the
composition, structure,

and properties of
matter, and the changes

matter undergoes.

End of slide show, click to exit.

What is Chemistry?

The study of the composition,
structure, and properties of matter, and the changes matter undergoes.

What is Matter?

Anything that has mass and
occupies space.

How Can We Study Matter
When There is So Much of It?

All of matter is made up of
just a few “kinds” of matter.

People once believed that
everything was made up of air, earth, fire and water.

Each “kind” of matter has a
smallest possible piece that has all the properties of that “kind” of matter.

How Can We Study Matter
When There is So Much of It?

Today, we call those “kinds” of
matter elements.

The smallest piece of an
element that has the properties of that element is an atom.

Matter can be . . .

A mixture

A kind of matter that can be
separated into two or more other kinds of matter by physical processes.

A substance

A kind of matter that can not
be separated into other kinds of matter by physical processes.

Separation of a
Homogeneous Mixture

Separation of a
Heterogeneous Mixture

When a Mixture is
Separated . . .

There is no change in the
chemical identity of any of its components (substances).

We take advantage of
differences in physical properties to achieve the separation.

Example of a Physical
Change

Example of a Chemical
Change

Mixtures vs. Compounds

A mixture can have a variable
composition but a compound has a fixed composition.

Example: H2O is
11.19% H, 88.81% O

When a mixture is formed, the
individual substances retain their properties, but when a compound is formed,
the elements lose their properties.

Evidence for the Atomic
Theory

Law of Definite Proportions

Law of Multiple Proportions

Law of Conservation of Mass

Definite / Multiple
Proportions

Conservation of Mass

Discovery of the Electron

Slide 16

Charge of the Electron

Plum Pudding Atom

A Test of the
“Plum-Pudding Hypothesis”

Nuclear Model of the Atom

Slide 21

Slide 22

Slide 23

Slide 24

Slide 25

Slide 26

Slide 27

Slide 28

Slide 29

Slide 30

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Second level

Third level

Fourth level

Fifth level

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What is
Matter?

•

Anything that has
mass and occupies

space.

How
Can We Study Matter When

There is So
Much of It?

•

All of matter is
made up of just a few

“kinds” of
matter.

–

People once
believed that everything was

made up of air,
earth, fire and water.

–

Each “kind” of
matter has a smallest possible

piece that has
all the properties of that “kind”

of matter.