MATH 1550 Chapter : Section 2.5 (cont)
Document Summary
Science: use of evidence to construct testable explanations and predictions of natural phenomena, as well as the knowledge generated through this process. Scientists: employ variety of techniques to investigate natural world, make explanations public, critique other explanation, in discussion section of publications, reviewing manuscripts, etc. Our typical experience: body temp of 37 degrees c, upper temp for life is 132 degrees c. 3/15/2019 10:09:00 pm: pure substances that cannot be broken down into 2 or more simpler substances, 92 naturally occurring, 118 known elements. Atom: smallest unit of a chemical element. Components of an atom: nucleus, proton (+1, 1 dalton mass, neutron (0 charge, 1 dalton mass, electron (-1 charge, essentially without mass) Atomic number: number of protons in nucleus. Atomic mass: number (mass) of protons and neutrons in nucleus. Electrical charge: number of electrons = number of protons, in an ion, the number of electrons is not equal to number of protons.
