1. Yesterday, we asked “are all chemicals bad?”
No, but some can be dangerous
Chemicals are everywhere
Which brings us to…

2. What is Chemistry? What is Matter? What is Mass?
the study of matter and the changes that it undergoes.
What is Matter?
anything that has mass and takes up space
What is Mass?
a measurement of the amount of matter in an object

3. Mass verses Weight They are related, but what’s the difference?
Mass is universal, weight depends on gravity
Weight = mass times the gravitational pull

4. Branches of Chemistry Organic Inorganic Analytical Physical
Biochemical

5. Organic Area of Emphasis Most carbon-containing chemicals Examples:
Pharmaceuticals
Plastics

6. Inorganic Area of Emphasis
In general, matter that does not contain carbon
Examples:
Minerals
Metals and nonmetals
Semi-conductors

7. Analytical Area of Emphasis Components and composition of substances
Examples:
Food Nutrients
Quality Control

8. Physical Area of Emphasis
The behavior and changes of matter and the related energy changes
Examples:
Reaction Rates
Reaction Mechanisms

9. Biochemical Area of Emphasis Matter and processes of living organisms
Examples:
Metabolism
Fermentation

10. Next, Experimentation

11. Why do we have the scientific method?
Gives us logical steps to follow to assist us in answering a question.

12. What are the “steps”? Develop a question Conduct background research
Form a hypothesis
Test with an experiment
Make observations and collect data
Analyze the results
Draw conclusions
Report results and test again

13. Parts of an experiment

14. Independent Variable Part of the experiment that the scientist changes
What is being tested
There is only one independent variable at a time.
What I change

15. Dependent Variable
Part of the experiment that changes because of the independent variable

16. Part of the experiment that does not receive the independent variable
Control
Part of the experiment that does not receive the independent variable

17. Constants
Part of the experiment that remain the same for every part of the experiment

18. Types of Data Quantitative Data that is numerical in nature
Qualitative
Data that is descriptive in nature

19. An example experiment
A person wants to test whether music can help make plants grow. The person plants several seeds from the same batch into identical flower pots with identical potting soil, watering schedule and light supply. One flower pot is isolated from the sound supply, while the other pots are subjected to various types of music. After 1 month, the “healthiness” of each plant is measured.