1 - Discuss Questions from Video

Segment 1: Oxygen and Atoms (8 min.)

Q: Describe Joseph Priestley’s early experiments with gasses.

A: Priestley heated mercury with a magnifying glass; it began to change to metal and release a gas, which he captured. In 1774 he and French scientist Antoine Lavoisier successfully isolated the gas. By weighing the substances, Lavoisier was able to tell that a gas was isolated.

Segment 2: Chemical Structure (9 min.)

Q: How did August Kekule’s discovery about carbon change the science of chemistry?

A: August Kekule established a simple formula to represent how chemicals bonded. Benzene was the only chemical compound that did not fit the formula because its chain of carbon and hydrogen atoms required more combining power than the formula allowed. Kekule realized that its six carbon atoms formed a ring (not a chain), and each one had a hydrogen atom attached with alternating single and double bonds. Thanks to this discovery, chemists had a formula to explain how carbon combined with other molecules to form chemical compounds.

Segment 3: Chemicals and Electricity (8 min.)

Q: How did Joseph Thomson discover electrons?

A: Experimenting with the electrical part of atoms, Thomson hooked the ends of a glass tube to electrical sources, which created a stream of cathode rays. After exposing the stream of cathode rays to a magnet, it bent. Magnets can only affect matter, so he determined that the stream was composed of an electrically charged substance (radiant matter). Thomson had found the first subatomic particles: The ray was a stream of electrons.

Segment 4: Chemical Compounds and Radioactivity (6 min.)

Q: What are the benefits of radioactivity?

A: The benefits of radioactivity include medical imaging, which is used to help find tumors; calculating the age of the Earth; powering spacecraft; and creating steady electrical current in some smoke alarms.

Segment 5: Plastics and Fullerenes (10 min.)

Q: How do you think nanotechnology will change our world?

A: Answers will vary.

2 - Complete Lab

3 - Lab 204 - Type Lab Reports

        - Writing a Lab Report.pdf

        - Lab Report Rubric.pdf

4 - Multiple Choice Quiz on Friday