Which of the following is NOT evidence that a chemical reaction has

occurred?

What happens when an atom has more electrons than can fit in one energy level? A. The extra electrons start to fill higher sublevels in the energy level. B. The extra electrons begin to fill the next energy level. C.

Which of the following is in the lanthanide family? A) Uranium B) Promethium C) Silver D) Gold

Many dinosaur bones are radioactive. Because of this, they are usually painted over with lead paint. Postulate A reason for why some of these very old fossils would have a radioactive signal and where it might be coming from?

G vinegar is a solution of acetic acid in water. if a 165 ml bottle of distilled vinegar contains 28.2 ml of acetic acid, what is the volume percent (v/v) of the solution?

The atomic mass of N is 14.01 g/mol and the atomic mass of H is 1.008 g/mol. what is the molecular mass of NH3

Why is it incorrect to balance a chemical equation by changing the subscripts?

Mendeleev's arrangement of elements in the periodic table was based on the observations and experiments of his predecessors who studied mass and properties of elements. True or false?

How many moles do you need to prepare 1.675 L of a 8.50 M NaOH solution? Round your answer to 2 decimal places.

For the following SN1 solvolysis reaction, select the correct rate equation and the overall reaction order (note: CH3OH is the solvent for the reaction). (CH3) 3CCl + CH3OH → (CH3) 3OCH3 + HCl

Which of the following is not a possible sublevel? 1s 2p 3f 4d