The diagram shows the setup of an experiment. A few observations of the experiment are listed in the table below the diagram. Observation 1: Color of solution turned blue
Observation 2: Shiny hair like crystals deposited on the copper strip

Which of the following is the correct explanation for one of the given observations?
A. Observation 1 is a result of silver ions moving into the solution.
B. Observation 2 is a result of nitrate ions moving into the solution.
C. Observation 1 is a result of silver ions changing their oxidation state.
D. Observation 2 is a result of silver ions changing their oxidation silver.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

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.

There are two steps in the usual industrial preparation of acrylic acid, the immediate precursor of several useful plastics. in the first step, calcium carbide and water react to form acetylene and calcium hydroxide: cac2 (s) + 2h2o (g) → c2h2 (g) + caoh2 (s) =δh−414.kj in the second step, acetylene, carbon dioxide and water react to form acrylic acid: 6c2h2 (g) + 3co2 (g) + 4h2o (g) → 5ch2chco2h (g) =δh132.kj calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxide from these reactions. round your answer to the nearest kj .