13 Handling Materials in the Lab... 1. Don’t touch anything until told to do so.2. Waft odors; don’t snarf.3. Carefully pour liquids away from your body.
14 4. Wash hands after handling materials and after class. 5. Clean up and dispose of materials as directed by your teacher.
15 6. If any part of your body comes in contact with a harmful chemical, rinse the area immediately and inform your teacher.
16 Before you begin an activity... 1. Read the activity carefully.2. Make sure your work area is cleared of any potential hazards.3. Don’t begin until instructed to do so.4. Listen carefully to the instructions of the teacher.
17 Handling a Heat Source...1. Use an electric hot plate whenever possible.2. To heat a test tube on a hot plate, use a water bath.
18 3. Use only heat-resistant glass. Be sure that it is NOT cracked. 4. Always keep the open end of the test tube pointed away from people.
19 5. Never allow a container to boil dry. Use boiling chips. 6. Pick up hot objects using gloves or tongs.
20 7. Turn off the heat source when finished. Put away correctly. 8. Apply cool water to burns immediately.
21 WHMIS... Workplace Hazardous Materials Information System Used to provide information about a chemical before it is used. How is the chemical dangerous?There are 8 symbols in WHMIS.
30 MSDS... Material Safety Data Sheet Provides information about the chemical you are using. For example if it is toxic and first aid treatments.Most MSDS sheets contain 8 common pieces of information.
31 1. Name of the Chemical2. Dangerous Ingredients3. Physical Data4. Fire and Explosion Hazard Data
32 5. Reactivity Data6. Toxicological Properties7. Preventive Measures8. First Aid Measures
33 Laboratory Equipment: Some Samples… Balance: used to determine the mass of an object.
44 The Scientific Method...An organized way to conduct a scientific experiment.There are 6 steps involved.
45 1. Purpose The reason(s) for doing the investigation or activity. Eg. To determine how studying effects science grades.
46 2. HypothesisYour best guess or prediction about the answer to the problem you are trying to solve.Eg. The more you study the better your science grades.
47 3. Materials The items necessary to carry out the investigation. Eg. Science bookwatch (for timing)test
48 4. ProcedureA detailed, step-by-step description of what you are going to do; the method.Eg. 1. Do science test without studying. Take test. Record score.2. Study 2 hours. Record score.3. Repeat 3 times and average.
49 5. Results and Observations What you learn from doing the experiment using your 5 senses. The results may be given as…statements graphscharts diagramstables
50 6. ConclusionYour interpretations of the results. Stating whether your hypothesis was right or wrong. Often times making inferences. (a possible explanation for your observations; it may be right or wrong.)
51 Variables and Controls... Located in the Procedure of an experiment.
52 Manipulated VariableThe part of the experiment that you change. There can only be ONE in each experiment.Eg. The length of time spent studying science.
53 Responding Variable The result; what happens. Eg. The result on your science test.
54 ControlsThe conditions of the experiment that must be kept the same to ensure you are testing what you set out to test. They keep the experiment fair.
55 Person being testedsubject testedwhere they studydifficulty of testwhere the test is writtenhealth of person
56 A visual display of data that is easy to read. Graphing...A visual display of data that is easy to read.
57 Terms to Know...Interpolation: determining values between the known points.Extrapolation: determining values beyond or outside the known points.
58 Origin: the point where the x and y axis intercept. Range: the difference between the highest and lowest values.
59 All you need to know to make an effective graph... MALCOM XMV on the left of a chart; MV on the x-axis of a graph
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