CHEM 6A Study Guide - Final Guide: Hydrogen Peroxide, Electron Affinity, Electronegativity

• School: UCSD
• Department: Chemistry and Biochemistry
• Course: CHEM 6A
• Professor: Carl Hoeger

Document Summary

Accuracy: closeness of measurement to the true value. Precision: closeness of individual measurements to one another. --length (m); mass (kg); time (sec); temperature (k); chemical amount (mol) Cardinal/counted values represent values that are indivisible without destroying the identity of the unit. 10dogs or 85 cars; molecules, atoms, electrons, ions, etc. Defined values are those for which the value has been exactly defined all metric to metric or english to english conversions (1 in = 2. 54 cm) Element: substance that contains only atoms with the same nuclear charge; substance that cannot be broken down into simpler substances and retain it chemical identity. Compound: substance composed of 2 or more elements chemically combine. Molecule: structure consisting of 2 or more atoms chemically bound together and so behave as an independent unit. Diatomic elements: although found as diatomic in nature, they combine as if they were monoatomic. Isotopes: atoms of an element with same # of protons, but different # of neutrons.