CHEM 121 LAB REPORTS 3 FINAL TEST PAPER
2026 FULL QUESTIONS AND SOLUTIONS
VERIFIED A+
◉ determinate errors. Answer: errors in method or performance
that can be discovered and eliminated
◉ indeterminate errors. Answer: random errors that are incapable
of discovery but which can be treated by statistics
◉ mean. Answer: average
◉ deviations, precide. Answer: The smaller the ______, the more
_______ the measurements
◉ any result that is more then two standard deviations from the
mean should be discarded. Answer: What is the rule of thumb for
standard deviation?
◉ gravimetric and volumetric analysis. Answer: What are the 2
common quantitative methods used in analytical chemistry?
, ◉ Finding the mass and percent of phosphorus in the sample by
using filter paper. Answer: What was the procedure and result of
Experiment 3?
◉ Added methanol to the zinc-iodide mixture, exothermic reaction
occurs, boil solution, and recover solid zinc. Answer: What was the
procedure and result of Experiment 4?
◉ Experiment 4: Finding an Empirical Formula- The Synthesis of
Zinc Iodide from its Elements. Answer: What experiment is this the
objective for: Combine elemental zinc metal and elemental iodine, a
non-metal, to form the binary ionic compound zinc iodide
◉ zinc. Answer: 3/4 is used in its elemental form as a coating to
protect iron and steel from corrosion
◉ red dog mine. Answer: World's largest zinc mine located above
the Arctic Circle in Alaska
◉ Iodine. Answer: shiny blue-black solid diatomic nonmetal
element; halogen; goes from a solid to vapor without becoming a
liquid; retrieved from underground brines
◉ AX+BY ----> AY+BX. Answer: What is the general equation for a
metathesis reaction?
2026 FULL QUESTIONS AND SOLUTIONS
VERIFIED A+
◉ determinate errors. Answer: errors in method or performance
that can be discovered and eliminated
◉ indeterminate errors. Answer: random errors that are incapable
of discovery but which can be treated by statistics
◉ mean. Answer: average
◉ deviations, precide. Answer: The smaller the ______, the more
_______ the measurements
◉ any result that is more then two standard deviations from the
mean should be discarded. Answer: What is the rule of thumb for
standard deviation?
◉ gravimetric and volumetric analysis. Answer: What are the 2
common quantitative methods used in analytical chemistry?
, ◉ Finding the mass and percent of phosphorus in the sample by
using filter paper. Answer: What was the procedure and result of
Experiment 3?
◉ Added methanol to the zinc-iodide mixture, exothermic reaction
occurs, boil solution, and recover solid zinc. Answer: What was the
procedure and result of Experiment 4?
◉ Experiment 4: Finding an Empirical Formula- The Synthesis of
Zinc Iodide from its Elements. Answer: What experiment is this the
objective for: Combine elemental zinc metal and elemental iodine, a
non-metal, to form the binary ionic compound zinc iodide
◉ zinc. Answer: 3/4 is used in its elemental form as a coating to
protect iron and steel from corrosion
◉ red dog mine. Answer: World's largest zinc mine located above
the Arctic Circle in Alaska
◉ Iodine. Answer: shiny blue-black solid diatomic nonmetal
element; halogen; goes from a solid to vapor without becoming a
liquid; retrieved from underground brines
◉ AX+BY ----> AY+BX. Answer: What is the general equation for a
metathesis reaction?
