Essential Laboratory Skills Review for Regents Day 2: Measurements and Safety
This review focuses on key laboratory skills necessary for the Regents exam, including accurate measurements and microscope usage. Students will learn to convert centimeters to millimeters by multiplying by 10 and how to measure liquid volumes using a graduated cylinder, focusing on the meniscus. The practice also covers microscope operation—starting on low power, using coarse and fine adjustments, and understanding diaphragm functions. Safety protocols for laboratory work, such as wearing goggles and gloves and careful handling of chemicals, are also emphasized.
Essential Laboratory Skills Review for Regents Day 2: Measurements and Safety
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Presentation Transcript
Regents Review Day 02 Laboratory Skills
Measurements Review • Multiply cm by 10 to get mm (ex. 7cm x 10 = 70mm) • Measure the volume of liquids with a graduated cylinder. • Measure liquids from the middle of the meniscus (curve).
Microscope • Start on low power because it has a larger field of vision, then zoom in to the center of the field with high power.
Microscope • Coarse adjustment – brings the image into focus • Fine adjustment – sharpens the image
Microscope • Diaphragm – lets in more light and makes the image brighter • Total magnification = eyepiece (ocular) x objective
Lab Safety • Wear goggles • Wear gloves • Do not drink chemicals • Handle chemicals and glass with care • Do not touch hot objects or fire
Homework #35 R.B. p 162-163, #1, 3, 9, 11 (full answers only)
