Which of the following are true concerning balanced chemical equations? There may be more then one true statement. A. The number of molecules is conserved.
B. The coefficients tell you how much of each substance you have.
C. Atoms are nether created more destroyed.
D. The sum of the coefficients indicates the mass ratios of the substance used.
E. The sum of the coefficients on the reactant side equal the same of the coefficients on the product side.

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.

Jose and eric were given four samples in lab. the results of their analysis are shown in the table. based on the data they collected, which sample is most likely a metal?

Which description best characterizes the motion of particles in a solid?