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57-SF-Problems-Ans

57-SF-Problems-Ans - GCHEM I WRITTEN SIG/FIG CONCEPT...

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GCHEM I WRITTEN SIG/FIG CONCEPT PROBLEM ANSWERS Before performing thw calculation of a problem, determine the number of sig/figs in all given data, imported data, and constants. Based on the determination, estimate the number of sig/figs that will be in your final answer (least precise data or constant). While performing the calculation always carry one digit more than the number of sig/fig that will be in your final answer to accommodate rounding. Round final answer ONLY !!! (Underline “number” in problem that will determine the number of sig/figs in the answer) 1. A brass cylinder is 4.668 inches long. If 1.00 inch equals 2.5 centimeters, how long is the brass cylinder in centimeters ? Gross Answer = ____ 11.67 ___ S/Fs = __ 2 ___ Answer: _________ 12 __________ 2. Average the following mass values of copper wire: 12 grams; 12.2 grams;14.23 grams Gross Answer = ____________ S/Fs = ______ Answer: _____________________ 3. What is the mass of a NaCl sample on a watch glass if the mass of the watch glass is 35.724 grams and mass of watch glass and NaCl is 45.67 grams ? Gross Answer = ____ 9.946 ____ S/Fs* = ___ 2 __ Answer: ______ 9.95 grams _____ 4. What is the calorimeter temperature change (Δ T) during an exothermic chemical reaction if the
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