Which of the following are lost or gained during a nuclear reaction?

a) electrons and nucleus
b) electrons and neutrons
c) protons and electrons
d) protons and neutrons

Between 2014 and 2016, more than 25,000 children in flint, michigan, drank water that was contaminated with lead from lead pipes. during this time, the city claimed the water was safe to drink. which of these actions could the city have taken to ensure that the drinking water was free from lead?

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer