How much water do you need to add 10ml of a solution hcl with ph 3 to change the ph to 6

What is the density of the black hole

Which of these conditions most likely produces an unstable isotope?

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules