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unit 1a test
unit la test
| Question | Answer |
|---|---|
| general safely rules | read all directions, report all accidents, don't perform or touch equipment without a teacher, wash hands, don't eat or drink, |
| fire blanket; fire extinguisher | to put out small fires on closes or to put on to walk through fire; for small chemical fires DON'T put water on chemical fires |
| safety shower and eyewash; fume hood | for chemicals that got on someone or in their eyes. 15 minutes; used for smoky, stinky, or poisonous vapors |
| dress code | googles, apron, gloves, hair tied back, clothing, no fake finger nails |
| heating and fire safety | never reach across or leave a lit burner, don't heat a chemical with out being instructed or in a closed container, point away from people, to test the heat use the back of your hands and grab with tongs. no.broken or cracked glassware |
| quantity | something the has magnitude, size, or amount- measurements (units) represents quantity |
| metric prefixes aka SI UNITS | KHD*DCM |
| kilo (k) | 1000, km-kilometer, kl-kiloliter, kg-kilogram |
| hecto(h) | 100, hm-hectometer, hl-hectoliter, hg-hectogram |
| deca(da) | 10, dm-decameter, daL-decaliter, dag- decagram |
| *unit | root word, meter-length, liter- liquid volume, g-mass/ weight |
| deci(d) | .1, dm-decimeter, dL- deciliter. dg-decigram |
| centi(c) | .01, cm-centimeter, cL- centiliter, cg-centigram |
| milli (m) | .001 mm-millimeter, mL-milliliter, mg-milligram |
| converting measurements | use decimal hopping to convent, also move the decimal the way you count |
| mass | the measure of the quantity of matter- it does not depend on gravity-kilogram is the standard SI unit- g and gm-triple beam balance always estimate 2 places after the decimal |
| length | measure distance- cm, m, and in-meter stick- centimeters are estimated to the hundredths and millimeter will be estimated to the tenth. 10 millimeter for 1 centimeter |
| temperature | measure of molecules motion- the SI Unit is kelvin. use celsius- measure with a thermometer |
| derived si units | a combination of SI bases ex: density-g/mL |
| volume | the amount of space occupied by an object, measured with a granulated cylinder, pipet or buret if liquid and ruler if solid. (look at the menses-bottom of the curve). solids- cm^3. liquids- mL (1mL=1 cm^3) |
| density | about of matter in a specific amount of space. the ratio of mass to volume. D=M/V. derived SI unit is kg/m^2 but the more common ones are g/cm^3 if solid or g/mL for liquid. this can change when temperature changes and it determines sink or float |
| accuracy | the closeness of measurements to the correct or accepted value or the quantity measured |
| precision | the closeness of a set o measurement of the same quantity made in the same way |
| extra | go back and study percentage error and density formulas |
Created by:
delaneyferris
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