What unit would scientists use to measure atoms?

The pH of a solution is 2.0. Which statement is correct? A) The pOH of the solution is 12.0. B) The concentration of OH - ions is 1.0 x 10-2 M. C) The concentration of H + ions is 100.0 M. D) The pOH of the solution is 7.

In which group do all atoms have seven valence electrons in the ground state?

Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 2.60 moles of magnesium perchlorate, mg (clo4) 2. express the number of moles of mg, cl, and o atoms numerically, separated by commas.

Which chemical bonds are found within water molecules? a. ionic b. inert d. hydrogen

Frozen CO2 or dry ice is different from CO2 gas in the atmosphere because it has a. no mass b. a fixed shape c. a lower density d. no fixed volume

Addition of an excess of lead (II) nitrate to a 50.0mL solution of magnesium chloride caused a formation of 7.35g of lead (II) chloride precipitate. What was the molar concentration of chloride ions in the solution (in mol/L) ?

2.70 L of a gas has a pressure of 0.63 atm. What is the volume of the gas at 105 kPa?

Which statements describe Rutherford's model of the atom? Select all that apply.

When aluminum is placed in concentrated hydrochloric acid, hydrogen gas is produced. what volume of h2 is produced when 7.20 g of al reacts at stp?

Which is most likely the result of millions of metal atoms crowding together so that molecular orbitals become combined?