What mass of NaOH is needed to make 500mL of 4M solution

What is a number added in front of a formula in order to balance the equation

How do you determine the percent yield of a chemical reaction

When an experimenter draws a conclusion that he assumes will apply to all situations set up similarly to his test situation, even though he cannot possibly have examined all possible test scenarios, the experimenter is using deductive reasoning inductive reasoning abductive reasoning subjective reasoning