Which statement describes a characteristic of a question that can be answered through scientific inquiry? (A. It can be answered by gathering opinions.) (B. It must have a simple "yes" or "no" answer.) (C. It must be asked by a person who is a working scientist.) (D. It can be answered through making observations.)

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

The chemical bond connecting one nucleotide with the next one along the nucleic acid chain is called a

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?