CWEA Lab Analyst Grade 1 questions with correct answers

Celcius (F-32)5/9 HPC media water bath 45`C, 3hr Precision a measure of how close a series of measurements are to one another Accuracy how close a measurement is to the true value Electrical Fire unplug & sodium bicarbonate analytical balance a device for determining mass that gives highly accurate measurements top loading balance used to determine mass; not as precise as an analytical balance triple beam balance instrument used to measure mass, less sensitive than top loading Coliform Gram-negative rod-shaped bacteria normally present in the intestine; includes E. coli and other species. temp and pH temp rises, pH drops. Must measure pH within 15 min of collecting sample Always add ___ to ___ acid to water spectrometer a device that spreads light into its different colors rounding off .5=keep # even <.4 stays the same >.6 round up sig fig rules Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant.