2 Wood e
Nean X M Inbox
usatestprep. com/modules/combined/ca. php?testid=1741&strand-8692& ;id=BM2197410&assignment_id:416 54411.
Copper No reaction even when gently heated
Little initial reaction
More vigorous reaction when heated
Iron
Positive test for hydrogen gas
Solution turned from colorless to yellow
Vigorous initial reaction; rapid evolution of gas.
Positive test for hydrogen gas.
Magnesium
All of the magnesium seemed to disappear
Solution remained colorless.
Initial reaction produced rapid evolution of gas; less vigorous than magnesium
Zinc All of the zinc seemed to disappear.
Solution remained colorless.
Formulas
Students in Ms. Brown demonstrated several chemical reactions but the data did not represent the law of conservation
of matter in any of the four experiments. Kai and Maria are about to add 3 grams of magnesium (Mg) to a test tube of
30 grams of hydrochloric acid (HCI). They covered their container with a balloon as a seal. If the girls expect a
chemical change as well as evidence of the law of conservation of matter, choose ALL of the predictions that are
appropriate?
6)
A)
There will be a rapid evolution of gas. ,
B)
The mass of the products will equal 339.
O
The solid magnesium metal will disappear.
D)
The balloon covering the container will expand.
E
There will be a dramatic change in temperature,
O
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Experiments in environmental toxicology can sometimes be manipulative experiments in which the researcher actively chooses and manipulates the independent variable. in hunt's study, for example, dosages of bpa were manipulated and the effects were measured. in manipulative studies, the researcher controls all the other variables in the experiment, so any health effects observed in the test subjects can be attributed to differences in the independent variable. in other cases, researchers use natural experiments in which the dependent variable (typically a measure of organism health) is measured under differing contexts that are not manipulated. say, for example, that an accidental chemical spill contaminates five ponds. to determine the possible effects of the toxic chemical on frogs, a researcher could compare the hatching rate of frog eggs laid in those five ponds to the hatching rate of eggs laid in five uncontaminated ponds nearby. this would be an example of a natural experiment because concentrations of the toxic chemical in the ponds were not controlled by the experimenter, but rather resulted from the chemical spill. drag type of experiment on the left to the example of experiment on the right. blood concentrations of bpa in college students are compared to their recent manipulative consumption of canned food items 2. the feeding behavior of fish in streams that receive acidic runoff from strip mines is compared to the feeding behavior of fish in unaffected streams. the deformity rate in baby birds from nests in pesticide-sprayed fields is compared to the deformity rate in birds from nests in unsprayed fields 4 tumor development is compared in mice exposed to five dosages of a known carcinogen in the laboratory foraging activity levels are compared in tadpoles exposed to four concentrations of toxic metals in the laboratory. growth of corn plants is compared in field plots sprayed with three different dosage: s of weed killer 7 bpa concentrations in the urine of people with diabetes are compared to bpa concentrations in the urine of people without diabetes - natural; manipulative

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

Select the correct answer from each drop-down menu proteins are