Chem 1212 Lab Final Exam Study Guide latest updated questions and Answers
what must you do before coming to the lab? - CORRECT ANSWER -take the lab quiz, write the chemical alert table in the lab notebook, review the chemicals and their hazards, read the experiment, prepare the lab notebook for the experiment
which of the following items of clothing are appropriate to wear in CHEM 1212 lab to protect your skin ? - CORRECT ANSWER -lab apron, t-shirt, scrub pants, jeans
which of the following are appropriate to wear in CHEM 1212 Lab to protect your feet? - CORRECT ANSWER -boots, loafers, or tennis shoes/sneakers
where is the eye wash station located? - CORRECT ANSWER -mounted on the wall next to the large sink
chemical causes dryness, itching, or sensitivity - CORRECT ANSWER -irritant
irreversibly destroys living tissue or metal upon contact - CORRECT ANSWER - corrosive
may cause harm through ingestion, inhalation, or skin absorption - CORRECT ANSWER-toxic
chemical proved to cause cancer - CORRECT ANSWER -carcinogen
excess chemicals disposal method - CORRECT ANSWER -appropriate waste container
used filter paper disposal method - CORRECT ANSWER -trash can
reaction mixture disposal method - CORRECT ANSWER -appropriate waste container
cracked or chipped beaker disposal method - CORRECT ANSWER -broken glass box
what if a person's hair catches on fire? - CORRECT ANSWER -wrap with fire blanket and stop, drop, and roll
what if a chemical spills on your leg? - CORRECT ANSWER -remove affected clothing and rinse with water for 15 minutes
what if a chemical gets in your eyes? - CORRECT ANSWER -flush with eye-wash solution for 15 minutes
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what if a chemical spills on your hand? - CORRECT ANSWER -rinse with water for 15 minutes
what should you do if you spill a chemical on your lab bench? - CORRECT ANSWER - clean it up using the spill kit in your lab.
can you eat or drink in the lab? - CORRECT ANSWER -no
when is it okay to remove your chemical splash proof goggles? - CORRECT ANSWER - when everyone in the lab has put away all chemicals and glassware
What is the density of a solid that occupies a volume of 5.89 mL and weighs 5.14 g? - CORRECT ANSWER -density = mass/volume
5.14 g/5.89 mL = 0.873 g/mL
sugar disappears when added to hot tea. what describes the relationship between sugar and tea? - CORRECT ANSWER -soluble
what will result when water (density = 1.0 g/mL), liquid M (density = 0.65 g/mL, immiscible with H2O), and liquid N (density = 0.80 g/mL, immiscible with M and H2O) are poured into test tube. - CORRECT ANSWER -three layers will form in the test tube.water is the bottom layer, liquid N is middle layer, and liquid M is the top layer.
the ability for a gas or solid to dissolve in a liquid - CORRECT ANSWER -solubiliy
mass to volume ratio - CORRECT ANSWER -density
the ability for two liquids to mix together - CORRECT ANSWER -miscibility
A + B → AB represents... - CORRECT ANSWER -combination
ABC → AB + C represents.... - CORRECT ANSWER -decomposition
AB + C → B + AC represents.... - CORRECT ANSWER -single displacement
AB + CD → AD + BC represents... - CORRECT ANSWER -double displacement
A + B → A+n + B-m represents... - CORRECT ANSWER -oxidation-reduction
amount of product recovered in an experiment - CORRECT ANSWER -actual yield
the amount of product produced if the experiment was 100% efficient - CORRECT ANSWER-theoretical yield
actual yield over theoretical yield times 100 - CORRECT ANSWER -percent yield 2 / 3
what is the equation for percent yield? - CORRECT ANSWER -actual yield/theoretical yield x 100
Cooper, Zach and Nate did this experiment dissolving 3.65 g of Cu(C2H3O2)2·H2O and adding 8.25 g NaC7H4SO3N·H2O (assume present in excess).
What is the theoretical yield of the product, Cu(C7H4SO3N)2(H2O)4·2 H2O(s)?
Molar Mass of Copper(II) acetate monohydrate = 199.65 g/mol Molar Mass of Sodium saccharinate monohydrate = 223.18 g/mol Molar Mass of product = 535.59 g/mol - CORRECT ANSWER -convert the grams of each compound to grams of the product - the lowest one is the theoretical yield
9.79 g
In a similar experiment, Cooper, Zach & Nate started with 4.36 g of Cu(C2H3O2)2·H2O and 9.87 g of NaC7H4SO3N·H2O and obtained 10.08 g of Cu(C7H4SO3N)2(H2O)4·2H2O.
Molar Mass of Copper(II) acetate monohydrate = 199.65 g/mol Molar Mass of Sodium saccharinate monohydrate = 223.18 g/mol Molar Mass of product = 535.59 g/mol
Theoretical yield and percent yield? - CORRECT ANSWER -theoretical yield - 11.70 g percent yield - 86.2%
For the procedural error, indicate if the error will affect the actual yield of copper(II) saccharinate product and if it does, will it raise or lower the actual yield: [experiment 4]
Scraping the filter paper so hard that small bits of filter paper are with the crystals on the watch glass - CORRECT ANSWER -raises the actual yield
For the procedural error, indicate if the error will affect the actual yield of copper(II) saccharinate product and if it does, will it raise or lower the actual yield: [experiment 4]
Leaving some crystals behind in the beaker - CORRECT ANSWER -lowers the actual yield
the reactant that is completely consumed during the reaction - CORRECT ANSWER - limiting reagent
the amount of product that could be produced using a given amount of reactant. - CORRECT ANSWER -theoretical yield
a small portion of a chemical species - CORRECT ANSWER -aliquot
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