Which change in oxidation number indicates oxidation

Ba (NO3) 2 name of this compound

Air is a mixture of gases that is about 78.0% N2 by volume. When air is at standard pressure and 25.0 ∘C, the N2 component will dissolve in water with a solubility of 4.88*10-4 M.

What is the density of a substance that contains 850 milligrams for every mL? Express your answer in grams per cm³.

Determine the number of protons, neutrons, and electrons in a neutral atom of the isotope oxygen-17. Explain how you arrived at your answer.

Why do elements with a higher atomic number tend to be more radioactive

Prepare a solution that is 0.1 M acetic acid and 0.1 M sodium acetate by measuring out 5.0 mL of the 1.0 M acetic acid solution and 5.0 mL of the 1.0 M sodium acetate solution in a 100 mL graduated cylinder, diluting the 10.

Which element has an ion that is smaller than an ion of calcium?

Which factor is responsible for the weak attraction between diatomic molecules of the halogens (group 7A) ? A) Hydrogen bonding B) Ionic bonding C) Dipole interactions D) London dispersion forces

Which is the correct equation for refractive index?

Alcl3) and lithium sulfate (li2so4) (note - this is a double replacement reaction. you need this information to predict the products of the reaction)