Chemistry, 11.10.2020 19:01 davidvickery6656
Sam wished to investigate how fertilizer run-off affects the growth of algae in freshwater lakes and streams. He set his experiment up in this way. He placed 900 ml of water into each of five 1000 ml glass beakers. To each beaker he added 5 ml of water from an aquarium which contained a large concentration of algae. The beakers were placed under a grow light which was timed to provide 12 hours of light each day. Liquid fertilizer was added to the beakers in the following amounts: Beaker A - 8 ml fertilizer, Beaker B - 6 ml fertilizer, Beaker C - 4 ml fertilizer, Beaker D - 2 ml fertilizer, and Beaker E - no fertilizer. Each week a random sample from each of the beakers was examined under a microscope to get a count of the number of algal cells present. What is the independent variable in this experiment?
Answers
Answer from: Quest
it should be all of them because it asks if you included all of those in your answer
explanation:
Answer from: Quest
(newtons first law)
conservation of momentum law states :
momentum before collision = momentum after collision
momentum p (kg-m/s)= mass * velocity
say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s
say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s
total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s
momentum after collision = 10 000 kg-m/s
mass now = 1 000 kg+2 000 kg = 3 000 kg
10 000 = 3 000 kg* velocity m/s
10 000/3 000 = velocity
3.33 m/s = velocity after collision
an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied
Answer from: Quest
Self-ionizes to form an equilibruium system in which [ h_{3} o^{+} ]=[ oh^{-} ]=10^{-7} m
Answer from: Quest
The answer is c. na2haso4 and na2so4
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Sam wished to investigate how fertilizer run-off affects the growth of algae in freshwater lakes and...
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