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Chemistry, 30.06.2019 08:30, nevarezchiu7972
Astudent did an experiment on the cycling of environmental gases. she placed water and bromthymol blue in each of four test tubes. no other items were placed in tube 1. she placed a snail in tube 2, an aquatic(elodea) in tube 3 and both a snail and elodea in tube 4. then she stoppered the tubes and placed them in bright light for 24 hours. the function of tube 1 in this experiment is to 1. detect the presence of glucose 2. determine the amount of gases in the water 3. demonstrate the transparency of the solution 4. serve as a control
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Chemistry, 21.06.2019 15:00, chhimmidemg
How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.
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Astudent did an experiment on the cycling of environmental gases. she placed water and bromthymol bl...
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