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• Set up apparatus far from the edge of the desk.
• Use knives or other sharp, pointed instruments with care.
• Pull cords, not plugs, when removing electrical plugs.
• Check glassware for scratches, cracks, and sharp edges.
• Do not use reflected sunlight to illuminate your microscope.
• Do not touch metal conductors.
USING CHEMICALS
• Always taste and smell chemicals.
• Read labels carefully.
• Avoid chemical contact with skin and eyes.
• Do not touch chemical solutions.
HEATING SUBSTANCES
• Keep your face away from test tubes and beakers.
• When heating substances in a test tube, point the top of the
test tube toward other people.
• Never leave apparatus unattended.
• Take care when lighting your Bunsen burner; light it with the airhole
closed and use a Bunsen burner lighter rather than wooden matches.
•Turn off hot plates, Bunsen burners, and gas when you are done.
• Keep flammable substances away from flames and other sources of
heat.
FINISHING UP
• Thoroughly clean your work area and any glassware used.
• Wash your hands.
• Be careful not to return chemicals or contaminated reagents to the
wrong containers.
• Dispose of all chemicals according to all local, state, and federal laws.
18. You will read about WATER TESTING METHODS. Before you
read do the tasks below.
A. Translate the derivatives and learn the words.
measure – измерять measurement
add – добавлять addition
compare – сравнивать comparator
accuracy – точность accurate
quality – качество qualitative
quantity – количество quantitative
B. Find these terms in the texts.
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