1. Daily Oral Review (DOR)
What is your favorite school subject?
What should I know about you so I can help you succeed in chemistry?
What are your hobbies?
4) What is your favorite TV show?
5) What is your favorite book?
6) What sports do you like?

3. The Scientific Method

4. The scientific method is used to help you find the answer to a problem using logical steps that make it easier to solve.

5. The Scientific Method:

6. Steps of the scientific method:
Observe surroundings and gather info Ask a question.
qualitative observations: use words to describe examples: sulfur is yellow
boiling water is hot
quantitative observations: use numbers to describe
example: sulfur has 16 protons
water boils at 100C

7. Form a hypothesis to explain
observations and/or a problem.
A hypothesis must be:
Testable
Refutable (able to be proved wrong)

8. Conduct an experiment to collect data
in order to support/refute hypothesis
Some experiments have the following:
independent/manipulated variable: YOU manipulate and change this variable
dependent/responding variable: this responds to the changes made in the independent variable
control: serves as a standard for comparison; nothing is changed in a controlled variable

9. 4. Draw conclusions based on data to either support or refute the hypothesis.
A theory is an explanation that has been supported by many experiments and by different people.
Theories attempt to explain WHY/HOW things occur.
Examples: Big Bang Theory
Theory of Evolution

10. A law is relationship that describes something that is known to occur without exception.
Laws do NOT explain why things occur.
Examples: Law of Gravity
Law of Conservation of Mass

11. You might see the scientific method “expressed” different ways, but it basically involves the same steps
hypothesis
experimentation
theory
repeatedly get same results without exception
law

12. How will the scientific data that is collected during an experiment be communicated to others so that they can try to repeat the experiment?

13. Graphs
a visual display of data used to discover relationships between the independent and dependent variable.

14. Bar Graph = purpose is to compare trends in size (magnitude)

15. Pie Chart (Circle Graph) = purpose is to show parts of a whole (percentages)

16. Line Graph = purpose is to show changes in data over time
Solubility Curve for Salts

17. Measurement Reliability
Accuracy: the closeness of a measured value to its accepted value
Precision: the repeatability of a measurement