Which of the following elements is not diatomic?

a. Neon.

b. Nitrogen.

c. No right choice.

Ethanol has a density of 0.79g/mL. If a sample has a mass of 10.2 g, what is its volume?

A 50-gram sample has a half-life of 12 days. How much material will remain after 12 days?

Is a small whole number that appears in front of a formula in a chemical equation?

How many moles of oxygen are needed to make 6.50 moles of magnesium oxide?

Which of the following is TRUE? A.) A buffer is most resistant to pH change when [acid] = [conjugate base] B.) The most effective buffers are those of strong acid/strong base pairs. C.

1.4 Explain why it is important to support individuals to challenge information about services that may present a barrier to participation

Which describes energy changes during nuclear fission? A very large amount of energy is produced from a tremendous mass. EEUU A very large amount of energy is produced from a very small mass. G .

A 0.75mol calcium carbonate (CaCO3) pellet has what mass?

The pH of the acid in the stomach is 2. When a person has heartburn, the acid in their stomach is coming up the esophagus (lower throat) and burning the lining of the esophagus. Why would a person take an Alka Seltzer tablet for heartburn?

Calculate the photon energy (in joules) for the light emitted from the hydrogen atom if ninitial = 4 and nfinal = 2.