If the total amount of energy required to change a substance to a different phase and temperature is positive, then does that mean that the phase change has moved in the direction of solid gas or gas - solid and has the temperature increased or decreased?
A. solid-gas temperature increase
B. solid-gas temperature decrease
C. gas sold temperature increase
D. gas - solid temperature decrease

When balancing a chemical equation:

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients

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.