A 500. mL sample of HCl has a pH of 1.50, how much water needs to be added to the sample to raise the pH to 2.20?

Suppose you discovered a new element with 120 protons and 2 electrons in its outer level . i'm what group does this new element belong? what properties would you expect it to have

Plz a person walks 1 mile every day for exercise, leaving her front porch at 9 am and returning to her front porch at 9: 25 am what was the total displacement of her daily walk a. 1 mile b. 0 c. 25 min d. none of the above

Where are the noble gases located in the periodic table? a. in the center b. on the left side c. in the upper right corner d. on the far right side