Toby's class is learning how different kinds of pollution affect living organisms. one of the things he has learned is that chemicals, such as laundry detergent, that we put down our drains can end up in lakes, rivers in streams.

toby decides to use what he has learned to set up an experiment to determine whether some kinds of laundry detergents are more harmful to plants than others. in his experiment, toby will make four terrariums from soda bottles. he will put soil in the bottom of the terrariums and put a plant in each one.

which of the following tables correctly shows which variables toby should keep the same in his experiment and which variables he should change?

w.
x.

y.
z.
a.
z
b.
w
c.
x
d.
y
reset submit

You mix the pks of succinic acid are 4.21 and 5.64. how many gramsa graduate student at sdsu wants to measure the activity of a particular enzyme at ph 4.0. to buffer her reaction, she will use a buffer system based on one of the acids listed below, which acid is most appropriate for the experiment? of monosodium succinate (fw = 140 g/mol) and disodium succinate (fw = 162 g/mol) must be added to 1 l of water to produce a solution with a ph 5.28 and a total solute concentration of 100 mm? (assume the total volume remains 1 liter, answer in grams monosodium succinate, grams disodium succinate, respectively.) volumes of 0.05 m nah2po4 and 0.05 m na2hpo4 (pk's for phosphoric acid are 2.15, 6.82 and 12.38). which of the following best describes the resulting solution?

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out

Which of the following are good traits of a hypothesis? it will be able to be testedit can predict an outcomeit will explain the observationsall of these