The table compares the type of reactants and products taking part in two chemical changes.

chemical change comparison

chemical reaction reactants products

x an element and a compound a compound

y an element and another element a compound

which of the following statements correctly identifies the synthesis reaction and explains why?

only chemical reaction x, because one reactant is a compound

only chemical reaction y, because both reactants are elements

neither chemical reaction x nor y, because they have only one product

both chemical reactions x and y, because there are two reactants and a single product

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.