Download - CHEMISTRY SEPTEMBER 11, 2014
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CHEMISTRYSEPTEMBER 11, 2014
DENSITY
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SCIENCE STARTER
• Work silently and individually on your Science Starter• Do not use your note• You have 3 minutes
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OBJECTIVES
• SWBAT–Identify differences between mass
and weight–Define volume–Apply density formula
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AGENDA
• Science Starter•Quiz review•Density activity
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QUIZ REVIEW
• Definition of chemistry• Difference between applied and
pure chemistry• 5 major divisions of chemistry• Convert using dimensional
analysis
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QUIZ REVIEW (CONT)
• Steps to the Scientific Method• Differences between hypothesis,
theory and law• Definition of measurement• Accuracy and Precision
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DENSITY
SODA CANS
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OBSERVATION
• Using the handout in the Observation block – identify what do you see. Provide details.
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PROBLEM
•List any problems or question you may have in the PROBLEM block.
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HYPOTHESIS
• In the Hypothesis block – state your hypothesis
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EXPERIMENT
• In the Experiment block – list the steps for this demonstration
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DEMONSTRATION
• Do the demonstration
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DATA COLLECTION/ANALYSIS
• Record in details what you saw happened.• Then analyze the data that was
collected
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CONCLUSION
• What was the result?• Did you conclusion support the
hypothesis?
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THE SCIENCE BEHIND IT
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MASS
–the amount of matter an object has–Base unit is kilogram–Use a scale
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WEIGHT–Measure of the
gravitational force exerted on an object–Its value can
change depending upon location
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VOLUME
• Definition – the amount of space an object occupies
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VOLUME – LIQUID MEASUREMENT
• Liquid - put into a liquid measuring device (such as a graduated cylinder) and the amount seen is the measured value
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VOLUME – SOLID MEASUREMENT
• Regular shaped solid – can be determined by using the volume formula for the shape–Rectangular box: V=lwh–Cube: V=s3
–Cylinder: V=πr2h–Sphere: V=4/3 πr3
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VOLUME SOLID MEASUREMENT (2)
• Irregular shaped solid–Water displacement• Take the volume measurement of
water in a container•Add the irregular shaped solid and
take the new measurement• Take the difference to get the volume
of the solid
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DENSITY
•Definition – the ratio of the mass of a substance to the volume of the substance•D = mass/volume = m/V
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DENSITY QUESTIONS
• Complete the Density Question Worksheet.