Sally carries out the following chemical reaction in an open container. MnO2 (s) + 4HCl (aq) MnCl2 (aq) + 2H2O (l) + Cl2 (g)

She finds that the total measured mass of the products is less than the mass of the reactants. How can she best explain this difference in mass between the products and reactants?

1Mass was not actually conserved in this reaction

2Because the products are all liquid or gas, they cannot be measured accurately

3The water formed in the reaction made up the mass of the chlorine gas that was released

4Some of the mass in the product was converted into gas, which was released into the air

When water dissociates, each water molecule splits into a hydroxide ion and a) h 3 o + b) a hydrogen atom c) a hydrogen ion d) h 2 o e) oh —

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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.