CHEMISTRYSEPTEMBER 11, 2014

DENSITY

SCIENCE STARTER

• Work silently and individually on your Science Starter• Do not use your note• You have 3 minutes

OBJECTIVES

• SWBAT–Identify differences between mass

and weight–Define volume–Apply density formula

AGENDA

• Science Starter•Quiz review•Density activity

QUIZ REVIEW

• Definition of chemistry• Difference between applied and

pure chemistry• 5 major divisions of chemistry• Convert using dimensional

analysis

QUIZ REVIEW (CONT)

• Steps to the Scientific Method• Differences between hypothesis,

theory and law• Definition of measurement• Accuracy and Precision

DENSITY

SODA CANS

OBSERVATION

• Using the handout in the Observation block – identify what do you see. Provide details.

PROBLEM

•List any problems or question you may have in the PROBLEM block.

HYPOTHESIS

• In the Hypothesis block – state your hypothesis

EXPERIMENT

• In the Experiment block – list the steps for this demonstration

DEMONSTRATION

• Do the demonstration

DATA COLLECTION/ANALYSIS

• Record in details what you saw happened.• Then analyze the data that was

collected

CONCLUSION

• What was the result?• Did you conclusion support the

hypothesis?

THE SCIENCE BEHIND IT

MASS

–the amount of matter an object has–Base unit is kilogram–Use a scale

WEIGHT–Measure of the

gravitational force exerted on an object–Its value can

change depending upon location

VOLUME

• Definition – the amount of space an object occupies

VOLUME – LIQUID MEASUREMENT

• Liquid - put into a liquid measuring device (such as a graduated cylinder) and the amount seen is the measured value

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

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

DENSITY

•Definition – the ratio of the mass of a substance to the volume of the substance•D = mass/volume = m/V

DENSITY QUESTIONS

• Complete the Density Question Worksheet.