Answer:
I think its either A or B.
Explanation:
The reason I don't think it can be B or C is because both have too do with thinking. Technology does not control how you think, so those should stay about the same. Technology can help prove theories and hypothesis' to be true, but they could also make more observations due to the technology they didn't have before. I believe the answer is A, but I'm not 100% sure. Good Luck, i helped as best as i thought possible.
Answer:
<em>(B.) What is the molar solubility of barium chloride, BaCl2 in water? </em>
Explanation:
Molar solubility is the number of moles of a substance that can dissolve in a liter of solution to the point of the solution's saturation. It can be calculated stoichiometrically from a substance's solubility product constant in mol/L.
Since all the 
reacted all the 
from the information, we can easily assume all the substances were consumed in the reaction, and hence account for their purity. Furthermore, 
is insoluble in water, the most probable scientific query would be the molar solubility of the used in the experiment.
Answer:
See Explanation
Explanation:
Positional Energy for electron as function of principle energy level (n)
=> Eₙ = -A/n²; A = 2.18x10⁻¹⁸J
Positional Energy for electron in n=2 => E₂ = -2.18x10⁻¹⁸/(2)² = -5.45x10⁻¹⁹J
Positional Energy for electron in n=3 => E₃ = -2.18x10⁻¹⁸/(3)² = -2.42x10⁻¹⁹J
ΔE(n=3→2) = -5.45x10⁻¹⁹J - (-2.42x10⁻¹⁹J) = -3.03x10⁻¹⁹J
