Summary

Atomic Theory

“All things are made up of atoms.”

States of matter

Solid, liquid, gas, and plasma

State of Solids

  • Has definite shape and volume
  • High density and not very compressible
  • Does not depend on the shape of the container (doesn’t fill it in)

State of Liquids

  • Has a fixed volume
  • Takes the shape of container
  • Less dense than solids
  • Almost incompressible

State of Gases

  • Takes the shape of the container
  • Takes the volume of container (this means that the gas molecules can be spread out evenly in the container or compressed in a smaller container. The volume is when the molecules are evenly distributed.)
  • Can be compressed
  • Gases are in the gaseous state at room temperature
  • Gases have more energy than liquids, and solids.
  • Gases are less dense.

State of Plasma

Plasma is simply an ionized gas, where the gas is charged with free electrons and positive ions because of the amount of energy plasma contains.

Unit 2.8 – Conceptual Questions

What happens to the barometer readings as you go up a mountain?

How come you can never hard boil an egg up a very tall mountain?

How does a pressure cooker work?

How come your tire pressure has to be checked during seasonal change?

What happens to a helium balloon that is placed in a freezer?

Explain why a bag of chips would expand or even explode when you take it on a plane?

A tornado is coming near your house, is it a better to open the windows or leave the windows closed? Why or why not?

—Why is it not advisable to place an aerosol can in a fire?

—How did the newspaper support the heavy weight at the end of the meter stick?

—Why do you need to acclimatize in depths of intervals when you go SCUBA diving?