A pair of 100mL samples of water are taken from a well bored into a large underground salt(NaCl) deposit. Sample #1 is from the top of the well, and is initially at 32. Sample #2 is from a depth of 50. M, and is initially at 42C. Both samples are allowed to come to room temperature (20. C) and 1atm pressure. An precipitate is seen to form in Sample #1.

Which of the following observations indicates that an atom has neutrons? some uncharged particles are scattered by a beryllium atom when it hits a gold foil. some uncharged particles bounce back from a gold foil when it is bombarded with alpha particles. a radiation consisting of uncharged particles is emitted when alpha particles strike beryllium atoms. a radiation which attracts electrons is produced when a beryllium atom is bombarded with alpha particles.