1. Midterm review

2. Scientific Method Recognize the problem (observe, infer)
Form hypothesis
Test Hypothesis
Analyze data
Draw conclusions
Communicate

3. Scientific Method-terms
Hypothesis- A statement that can be tested
Inference- a conclusion about an observation
Experiment-investigation to test a hypothesis in planned steps

4. Independent variable- factor that you can change in an experiment
Dependent variable- the factor or outcome that is measured
Constant- factor that always stays the same
Control- standard used for comparison

5. Lab safety Study the procedures, ask teacher if you have questions
Obtain teachers permission to begin all investigations and to use lab equipment
Never eat, drink chew gum, apply comestic or do any personal grooming in lab
Never use lab glassware as food or drink container

6. Lab safety Use safety equipment including, aprons and goggle,
Tie back long hair and loose clothing
Keep hands away from face and mouth

7. Lab Tools Identify the following tools: cylinder
Erlenmeyer flask beaker test tube graduated
cylinder

8. Metric Measurement a. Basic Unit for Mass: b. Basic Unit for Length:
Gram, g
Tools used to measure mass: triple beam balance
b. Basic Unit for Length:
Meter, m
Tools used to measure length: Metric ruler, meter stick
Basic Unit for Volume:
Liter, L
Tools to measure volume: graduated cylinder

9. Chapter 20: Changes in Matter
Physical change: A change in which the appearance of matter changes, but not its composition.
ex: water freezing, mold clay, crumple paper

10. Physical Property: A property that can be observed without changing the composition of the substance.
Examples:
The apple is red.
The ball is round.
The paper has the ability to be ripped.
The pond has the ability to freeze.
The water has the ability to boil.

11. Chemical Change: A change in which the composition of the substance changes.
ex: nail that rusts, candle burning
Chemical property: a characteristic that cannot be observed without altering the substance.
Ex: ability to burn, ability to rust