How did the discovery of atoms explain the observation that the mass of the products always equals the mass of the reactants in a reaction?

The is a particle with one unit of positive charge a. proton b. positron c. electron d. nucleus awnser quick it is a important science test!

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

0.2348 grams of pbcl2 used to form 44.0 ml of solution.