Using Laboratory Equipment Chapter 3

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Using Laboratory EquipmentChapter 3
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• Sewing a shirt
• Making an oak table
• Laboratory equipment
• What do each of these have in common?
• Use specialized tools need to know how to use
  the equipment properly.
• Need to know the rules for equipment care and
  safety.

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Containers and Holding Devices
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Laboratory Equipment

• Beakers
• -a glass container
• that has a wide
• mouth and holds
• solids and liquids.
• -use for approximate
• amounts.

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• Graduated cylinder-
• -tall, cylindrical container used for
  measuring the volume of liquids.
• -use for exact measurements.

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• What is the meniscus?
• How is the measurement read?

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• Test Tubes
• -a cylindrical container that holds a small
  quantity of a solid or liquid.

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• Erlenmeyer flasks
• a cone-shaped container with a narrow neck and a
  broad flat bottom.

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• Stirring rod
• Used to mix chemicals and liquids for laboratory
  purposes.
• Usually made of solid glass, about the thickness
  and slightly longer than a drinking straw, with
  rounded ends.

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• Burets-
• -a long, thin cylinder, which is marked to 0.1
  of a milliliter.
• -use to transfer exact amounts of liquids.

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• Thermometers
• -Marked with the Celsius scale
• Why shouldnt you bring a thermometer from home
  for your experiments?
• Handles much higher temperatures.

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• Balance
• -a scientific instrument that determines the
  mass of material.
• Mass is a measure of the amount of matter in a
  sample.

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• Finding the mass of a substance placed on a
  balance is known as massing it.
• Mass is constant. An object will always have the
  same mass value.

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• Weighing applies to using a spring scale to
  measure weight.
• Weight is the gravitational pull of the Earth on
  an object.

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Calibrating Measuring Equipment

• How can you be sure the measurements are
  accurate?
• To ensure correct readings, instruments are
  calibrated.
• Calibrate
• -to check, adjust, or standardize the marks on a
  measuring instrument.

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Explain which piece of laboratory equipment would
be most useful for the following tasks.

• Holding 50 mL of boiling water.
• Measuring exactly 43 mL of water.
• Weighing out 120 grams of sodium chloride.
• Mixing two liquids together.