| A | B |
|---|
| chemistry | the study of all substances and the changes that they can undergo |
| why is chemistal called the central science? | it overlaps many sciences |
| Scientific Method | a way of answeriing questions about the world we live in |
| Observations | leads to a question, fact that is noticed |
| Hypothesis | proposed, but unproved, explanation of ibserved facts |
| Natural Law | description of a phenomenon that has been repeatedly and uniformly observed in nature |
| Theory | logical and time tested explanation of a phenomenon that occurs in the natural world |
| Experiment | carefully devised procedure for making observations and gathering data |
| conclusion | judgement or opinion formed as a result of analyzing experimental data |
| variable | factor being tested in an experiment |
| Indepentant variable | test at which you need to keep all variables constant |
| dependent variable | you change to suir independent variable |
| control | factor that remains constant during an experiment and is compared with the variable |
| SI | inculdes 7 base units to measure length, mass, time temperature, electric surrent, light intensity, and amount of a substance |
| base unit | one of 7 SI units, includes, kilogram, s,mole, K, ampere, and candela |
| unit of Mass, distance, time, volume | kg, m, s, m2 |
| dervived unit- | combination of base units |
| metric prefixes for M, k, d, c, m, u, n, p | mega, kilo, deci, centi, milli, micro, nano, pico |
| meaning of M,k,d,c,m,u,n,p | 1000000, 1000, 1, 0.1, 0.01, 0.001, 0.000001, 0.000000001, 0.000000000001 |
| Dimensional Analysis | technique of converting between untits |
| Conversion Factor | an equation that is always equal to 1 |
| graphs | drawn to show the relationship between 2 or more things, x= independent(horizontal), y=dependent (vertical) |
| plotting data on graph | putting dot at intersection of corresponding valves of each pair of measurement |
| Scientific Notation | 2 parts, 1-number between 1 and 10, 2- power of ten, |
| converting numbers to sci not. | count decimal spots so final number is between 1 and 10, when decimal moved to right it's a neg number, when it's moved to the left it's a positive number |
