The atomic number is what?

If the pH changes from 5 to 6, the H + would concentration would?

How many atoms or molecules are there in a mole of a substance?

Of the elements Pt, Sc, V, and Kr, which is a nonmetal?

What volume would be occupied by 120 grams of argon gas (ar) at standard conditions?

Explain how human chromosome 13 can be composed of just two molecules but have so many atoms.

Which usually has a higher temperature? A city or the areas around the city?

Toluene and pyridine form ideal solutions. Consider a solution of toluene and pyridine prepared at 25°C. Assuming that the mole fractions of toluene and pyridine in the vapor phase are equal, calculate the composition of the solution.

Formula for water what does the lack of a subscript after those O indicate

Why do the chemical properties cycle through each period? Every eighth element starting with hydrogen restarts the transition from metal to inert gas. Elements with atomic numbers which are multiples of eight start a new period.

Which statement correctly describes the Ka of a weak acid? The Ka is large, and the equilibrium favors products. The Ka is large, and the equilibrium favors reactants. The Ka is small, and the equilibrium favors products.