Prologue:

1
Prologue

• Observations and Inferences

2
Observations.

• Things you can sense by
• Sight
• Touch
• Smell
• Hearing
• Taste

3
Inferences are guesses based upon previous
observations.

• Tell whether each of the following is an
  observation or inferences.
• The stream is not polluted
• Inference
• The Earth is spherical
• Observation
• The earths outer core is liquid.
• Inference

4
Density Mass/Volume

• Mass is.
• The amount of matter in a sample
• It is measured using a
• Triple beam balance (grams)
• Volume is
• The amount of space a sample occupies
• It is measured using a
• Graduated cylinder (cubic centimeters)

5
Calculate the density of a material which as a
mass of 27.5 grams and a volume of 6.2 cc.

• D mass/volume
• D 27.5 g / 6.2 cc
• D 4.4 g/cc

6
Deviation (your answer - the accepted answer)
/ accepted answer 100

• Calculate the deviation if you calculated the
  density of a material to be 5.0 g/cc and in
  reality it is only 4.6 g/cc
• First subtract to find the difference
• 5.0 - 4.6 .4
• Then divide that answer by the accepted value
• .4 /4.6 .087
• Multiply by 100 to get the 8.7