What statement best describes an independent variable?
a. the factor that's not changed by the experimenter and is impacted by the dependent variable
b. the factor that's changed by the experimenter and impacts the constant in an experiment
c. the factor that's changed by the experimenter and impacts the dependent variable
d. the factor that does not change, but impacts the constant in an experiment

There is a single path for electrons. the current decreases when additional resistors are added. the current will be the same in each resistor. these statements best describe a(n) circuit.

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Sodium sulfate dissolves as follows: na2so4(s) → 2na+(aq) + so42- (aq). how many moles of na2so4 are required to make 1.0 l of solution in which the na concentration is 0.10 m?