CHEM 202 NCSU Lab Final Study Guide with Questions and Answers

CHEM 202 NCSU Lab Final Study Guide
with Questions and Answers
What formula is used to determine the mmol of acid and base in the reaction table?
ANSWER Volume in mL x concentration in mmol/mL = mmol



Please describe the rules for handling significant figures for Lab 1, Data Table A. ANSWER
For data table A, the mmol of material are entered to 2 significant figures because the volume
has 2

sig figs, multiplied by the concentration of 2 sig figs. The temperature different is entered to
the 0.01

C, because the temperatures are to the 0.01 C and the difference in temperature should also be

entered to that level of precision.



What happens to the temperature change when the amount of limiting reactant is doubled?
ANSWER The temperature change will double.



What happens to the temperature change when the amount of non-limiting reactant is doubled
ANSWER The temperature change should remain the same



What formula is used when 1.50 mL of 0.500 CuSO4 stock solution is mixed with 6.50 mL
of water to determine the final [Cu2+]? ANSWER C1V1 = C2V2. For example, 1.50 mL of
0.500 CuSO4 solution diluted with 6.50 mL of water to a total of 0.500 M x 1.50 mL = C2 x
8.00 mL to give [Cu2+] = 0.0938 M



In a Beer's Law plot, what is the x-axis, what is the y-axis, and what do the slope and
intercept

represent? ANSWER The y-axis should be the absorbance. The x-axis should be the
concentration of what is being