Which are isotopes? an atom that has an atomic number of 20 and a mass number of 42 is an isotope of an atom that has?

A solution of salt (molar mass 90 g mol-1) in water has a density of 1.29 g/mL. The concentration of the salt is 35% by mass. a. Calculate the molality of the solution. b. Calculate the molarity of the solution. c.

Water vapor in the air becomes liquid water during condensation. which process is the reverse of condensation?

As a chlorine atom becomes a negative ion, the atom blanks an electron

Which of the following is TRUE? Which of the following is TRUE? A basic solution does not contain H3O+An neutral solution does not contain any H3O + or OH-An acidic solution has [H3O+] > [OH-]A neutral solution contains [H2O] =

If the pressure of a sample of gas is doubled at constant temperature, what happens to the volume of the gas?

What is DNA? What information does it carry? Where is DNA located?

5. Differences in which property allow the separation of a sample of sand and seawater by filtration? A) concentration of ions B) volume of sample C) mass of sample D) particle size

Describe the reaction of a weak acid and a strong base. In general, what will the final pH be when the reaction between equal moles of a weak acid and a strong base is complete?

Which is the balanced chemical equation for the reaction of nitrogen (n2) with oxygen (o2) to form no?

What cells are chicken eggs made from