chem ch 2
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25 terms
Terms | Definitions |
|---|---|
 scientific method | logical approach to problem solving |
| qualitative | descrptive, no numbers |
| quantitative | numbers, measurements |
| hypothesis | testable statement, true/false, yes/no |
| control | conditions held constant |
| variable | changed and response is observed |
| theory | hypothesis supported by data (extensive/experimental) |
| model | an attempted explanation of how something works |
| system | a specific portion of matter in a given region of space that has been selected for study during an experiment or observation |
| stages in scientific method | observing, formulating hypothesis, testing, theorizing, publish results |
| SI system | units are interrelated and changed by powers of ten |
| seven base units: | mass, length, time, temperature, amount of substance, electric current, luminous intensity |
| derived units | combinations of SI base units |
| volume | lwh, m cubed, liter: dm cubed, 100mL=1L, 10 dm=1m |
| density | m/v, kg/m cubed, g/cm cubed, g/mL |
| a good measurement should be: | accurate and precise |
| accuracy | closeness of a measurement to the correct/true/accepted value |
| precision | closeness of a set of measurements to each other- the reproducibility |
| percent error | measure of how far off your value is from the correct value, m value- c value/ c value x 100 |
| mass | kg, kilo=1000, 1000g=1 kg, 1000 mg=1g |
| length | m, 100 cm=1m, 1000 m=1 km, 1000 mm=1 m |
| time | second |
| temperature | kelvin (K), C +273.15=K, K-273.15= C |
| amount of substance | mole (mol) |
| dimensional analysis | a mathematical technique that allows you to use units to solve problems involving measurements |
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