CHEM 1201 Chapter : Chem 1201 Chapter 2
Document Summary
Volume conversion factor = (2. 54 cm / in)^3 = 16. 4/ in. Early humans discovered that matter has mass and takes up space. Everything is composed of small partcles and is indivisible. Kite expirment is responsible for choosing + for one charge and for the other. Combine in the same whole number ratio charge. Cathode rays come out of the cathode (-) and move to the anode (+) Anode rays need a strong electric and magnetic fields. Radioactivity some elements spontaneously emit energetic rays . Rutherford scattering experiment an atom is mostly empty space heavy protons and neutrons in the center, light electrons in a surrounding cloud. A proton and neutron have about the same mass. A proton has 1836 times the mass of an electron. Mass number = number of protons + neutrons. Isotopes same protons, different number of neutrons. Prouts hypothesis atomic weights are whole number multiples of atomic weight of hydrogen.
