What is the reactant(s) of the reaction below?
MgCO3(s) → MgO(s) + CO2(g)
O
A. Magnesium oxide and carbonate
O
B. Magnesium carbonate
O
O
C. Magnesium and carbon dioxide
D. Magnesium oxide

What semimetal can form four single covalent bonds.

What metric units would you use to measure the thickness of a key

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.