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Chem 133 Chap 1
Terms from chemistry chap 1
| Question | Answer |
|---|---|
| Accuracy | how close a measurement is to the true value of the quantity |
| Chemical Property | to observe this prop. chemical change(ex. burning)must occur |
| Chemistry | the study of matter and the changes it undegoes. |
| Compound | substance made of atoms of 2/more elements united in fixed proportions. |
| Density | mass of an object divided by it's volume (d=m/v) |
| Element | substance that can't be separated into simpler substs by chemical means. |
| Extensive Property | depends on how much matter you considered (mass/volume). |
| Heterogeneous mixture | comp of the mixture is not uniform(sand and iron fillings) |
| Homogeneous mixture | composition of the mixture is uniform thruout(h2o and sugar) |
| Hypothesis | a tentative explanation for a set of observations |
| Intensive property | does not depend on how much matter you have (temp/density) |
| International System of Units | revised metric system |
| SI | International System of Units |
| Kelvin | SI base unit for temperature(0K lowest temp theoretically possible) |
| Law | concise verbal/math stmt of relatshp btwn phenom thats always the same under the same conditions. |
| Liter | the volume occupied by one cubic decimeter (1dm^3) SI unit for volume |
| Macroscopic Property | Props that can be determined directly(length,volume,mass) |
| Mass | the measure of the amount of matter in an object (kg is SI unit for mass) |
| Matter | anything that occupies space and has mass |
| Microscopic Property | on the atomic or molecular side - must be determined by an indirect method. |
| Mixture | combination of 2/more subs in which the subs retain their identities |
| Physical Property | can be measured/observed w/o changing the comp/id of subs. |
| Precision | how closely 2/more measurmnts of the same quant agree with one another |
| Qualitative | general observs about the sys(can't be said as |
| Quantitative | numbers obtained by various measurmnts of system (temp,time) |
| Scientific Method | systemic approach to research |
| Scientific Method steps | define problem,collect data, interpret data, repeat |
| Significant Figures | the meaningful digits in a measured or calculated quantity |
| Substance | form of matter that has definite/constant comp and distinct properties |
| Theory | unifying princp that explains body of facts and/or those laws based on it |
| Volume | measure of how much space an object occupies (SI unit is m^3-cubic meter) |
| Weight | force that gravity exerts on object-changes with changes in gravity |
Created by:
melwandelt
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