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Measurement and Lab Equipment

Measurement and Lab Equipment

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Measurement and Lab Equipment

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  1. Measurement and Lab Equipment

  2. Target • I can identify and correctly use common lab equipment used in the chemistry laboratory.

  3. Test Tube • A small glass container used to view chemical reactions or to heat small amounts of a substance

  4. Pipet • Like a dropper, it is used to transfer and dispense small amounts of a liquid.

  5. Bunsen Burner • This connects to the gas source in the lab. • The gas source provides the fuel for a flame. • The flame is used to heat substances.

  6. Beaker • A wide-mouthed container used to transport, heat, and store substances. • Can be used to measure liquid volume only if measurements do not need to be precise. • Always read from eye level. Notice that there are two scales on the beaker! Use the one that zero is at the bottom (right) if you are measuring the liquid. Liquid volume is measured in mL

  7. Lab Practice • Take a beaker from the drying rack on the center lab table and place 50mL of water into the beaker. • Get it approved by your teacher. • Empty the water and return the beaker to the drying rack. • Return to your seat.

  8. Flask • A narrow-mouthed container used to transport, heat, or store substances; often used when a stopper is required. • Can be used to measure liquid volume only if measurements do not need to be precise. • Always read from eye level.

  9. Graduated Cylinder • Used to measure volume very precisely. • First, determine what each line means. • Always read from eye level. • Always read the bottom of the meniscus (the dip).

  10. Lab Practice • Look at each graduated cylinder and write down the quantity each line represents. #3) 1mL #1) 1mL #4) 0.2 mL #2) 0.5mL

  11. Finding Volume of an Irregular Object • Place water in the graduated cylinder. • Record the water level. • Sink the object into the water. • Record the new water level. • Subtract the two water levels. • The answer is the volume. • Change the mL to cm3.

  12. What is the volume of this object? • Water Before: 30mL • Water After: 40mL • 40-30 =10 • Difference is 10mL • Object’s Volume: 10cm3

  13. Finding the volume of a regular shaped object. • Measure the length. • Measure the width. • Measure the height. • Multiply these together: L x W x H

  14. Balance • Measures the mass of objects and substances. • NEVER PUT YOUR HAND ON THE BALANCE PAN!!!

  15. To measure mass of objects: • Remove anything that is on the balance pan. • Turn the balance on to “zero out” (this is also called “tare”). This means that the reading should be 0.00 when there is nothing on the pan. If it is not zero, hit the tare button. • Place the object on the pan. • Record the reading in grams (g).

  16. To measure the mass of powders: • Remove anything that is on the balance pan. • Place a sheet of paper on the pan. • Turn the balance on to “zero out” or press the tare button. This means that the reading should be 0.00 when there is paper on the pan. • Place the powder on the paper. • Record the reading in grams (g).

  17. To measure the mass of a liquid: • Remove anything that is on the balance pan. • Turn the balance on to “zero out” or press the tare button. This means that the reading should be 0.00 when there is nothing on the pan. • Place the empty beaker, flask, or graduated cylinder on the pan. • Record the reading in grams (g). • Remove the glassware and add the liquid. • Measure the mass of the glassware and the liquid. • Subtract the mass of the empty glassware from the mass of the glassware with the liquid to determine the mass of the liquid.

  18. For Example: What is the mass of 100mL of water? • The mass of an empty beaker is 116g. • The mass of a beaker with 100mL of water in it is 217g. • You would subtract 116 from 217: • 217g-116g=101g. • The mass of 100mL of water is 101g.