1. Matter – Density and States of
Intro to Chemistry
Matter – Density and States of

2. Branches of Chemistry Branch Area of Emphasis Examples
Organic chemistry
most carbon-containing chemicals
pharmaceuticals, plastics
Inorganic chemistry
in general, matter that does not contain carbon
minerals, metals and nonmetals, semi-conductors
Physical chemistry
the behavior and changes of matter and the related energy changes
reaction rates, reaction mechanisms
Analytical chemistry
components and composition of substances
food nutrients, quality control
Biochemistry
matter and processes of living organisms
metabolism, fermentation

3. States of Matter
Most matter on Earth exists in one of three physical states: solid, liquid, or gas.
A fourth state of matter, plasma, is less familiar.

4. States of Matter
Changes in state are examples of physical changes because there is no change in the chemical composition or identity of the substance.
Ice can melt back to form liquid water, and steam will condense on a cool surface to form liquid water.

5. Plasmas
Plasmas are a lot like gases, but the atoms are different, because they are made up of free electrons and ions of an element such as neon
it is made up of groups of positively and negatively charged particles. In neon gas, the electrons are all bound to the nucleus. In neon plasma, the electrons are free to move around the system.

6. Aurora Borealis

7. States of Matter
Some substances are described as volatile, which means that they change to a gas easily at room temperature.
Alcohol and gasoline are more volatile than water.

8. States of Matter
Density is the amount of matter (mass) contained in a unit of volume. or
How much “stuff” is packed into a given space

9. To Calculate Density Which substance has the highest density?
Which substance has the lowest density?

10. Exit Ticket
Use the concept of density to describe how a bag of Styrofoam balls could be heavier than a bag of stones.