Chemteacher

swim, chem, baseball, I talk with my hands

Chemistry Honors – Class 02

Sig Figs Rule!

Sig Figs Rule!

Dates

  • Periods B: Tuesday, August 27th
  • Periods D, G: Wednesday, August 28th

Measurement

  • from yesterday – examine different numbers recorded for volume
  • measurement = comparison to a standard
  • depends on user and device
  • no such thing as pure truth
  • (in Math numbers are IDEAS)
  • users and devices introduce uncertainty
  • written number expresses uncertainty
  • Significant Figures – certain digits plus good guess

Activity Revisited

  • fill 100 mL beaker half way (approximately) and measure the volume
  • repeat for the two different graduated cylinders (10 mL, 50 mL)
  • Note – meniscus = bottom of liquid
  • record the air temperature using the thermometer
  • measure the width of the table (use the side marked in cm)
  • create a table to organize your information – label properly
  • include proper units
  • be ready to share with the class

Homework

  • Read – take notes on Ch. 1.3 -1.4
  • Typed notes to PDF  in shared folder
  • ONE MORE THING – please buy lab notebook ASAP LINK = http://goo.gl/nf28RW

Information

This entry was posted on 2014-08-26 by in Agenda, SHP-CH.

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