Lab Techniques

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Lab Techniques
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Measuring Distance

• Length
• the distance between two points
• Always use a metric ruler!

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How to read a metric ruler
Always estimate the last digit
Value
1.67 cm
cm
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Volume

• the amount of space
  something occupies
• Calculating volume of a cube
• L x W x H
• Check for Understanding
• Determine the volume of a cube that is 3 cm x 2
  cm x 5 cm

Answer 30 cm3
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Volume

• Of a liquid Use a Graduated
  Cylinder

Read the bottom of the curve of liquid (meniscus)
The volume of water in this cylinder is 6.62 mL
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• Check for Understanding

What is the volume of the liquid in this cylinder?
Answer 52.7 mL
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Volume

• of an irregular object

rock
What is the volume of the rock?
Answer 15 mL
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Mass

• the amount matter in a substance
• measured
• In grams (g)
• Using either a triple beam balance or an
  electronic balance

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• How to use a triple beam balance

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• How to use a triple beam balance

Place the object to be massed on the scale.
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Mass
add all the riders
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CHECK FOR UNDERSTANDING
What mass is indicated below?
137.40 g
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Temperature

• is how hot or cold
  something is

Science uses Celcius not Farenheit
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Measuring Time and Temp

• Reading a Celsius themometer
• What is the Celsius temperature on the
  thermometer to the right?
• answer 12.1 C

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Temperature

• Your Turn!
• What is the celcius temperature of the
  thermometer to the right?
• answer 13.8 oC

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pH

• Indicates how acidic or alkaline a solution is.

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Folding Filter Paper

• Fold the filter paper in half
• Fold in half again and tear off a small corner.
• Form into a cone with
  the torn
  side fitted
  against the funnel.