CHM 2046L - FINAL EXAM
QUESTIONS ANNSWERS
True-or-False:-If-you-are-late-to-class,-you-can-take-the-quiz-after-the-lab-is-over---ans-
✔✔False
List-4-pieces-of-PPE-(personal-protective-equipment)-that-must-always-be-worn-in-the-
lab---ans-✔✔--Safety-goggles
--Lab-coat
--Long-pants/skirts
--No-crop-tops
--Long-hair-tied-up
True-or-False:-The-volume-of-a-mixture-is-always-the-same-as-the-sum-of-the-individual-
volumes---ans-✔✔False
Ex.-When-mixing-10mL-of-rubbing-alcohol-with-10mL-of-water,-the-total-volume-will-be-
less-than-20mL
Is-the-mass-of-a-mixture-always-the-sum-of-the-individual-masses?-How-is-that-different-
than-volume?---ans-✔✔Yes,-due-to-the-law-of-consideration-of-mass,-masses-are-
additive.-Volumes-are-not-additive-due-to-the-different-molecular-components-of-each-
liquid-(size-of-molecules)
What-is-your-GTA's-name?---ans-✔✔Krystal-Baez
Accuracy---ans-✔✔How-close-a-measurement-is-to-the-true/actual-value
Precision---ans-✔✔How-close-together,-or-common,-the-measurements-are
How-would-you-round-a-graduated-cylinder-measurement?---ans-✔✔Ex.-2.65
How-does-TD-dictate-how-glassware-is-used-in-the-lab?---ans-✔✔TD-=-To-deliver-a-liquid
Ex.-Pipettes,-burets
How-does-TC-dictate-how-glassware-is-used-in-the-lab?---ans-✔✔TC-=-To-contain
Ex.-Beaker,-volumetric-flask
, Why-are-students-expected-to-develop-their-own-experimental-procedures-in-the-
chemistry-lab?---ans-✔✔To-develop-critical-thinking-skills-and-increase-their-
understanding-of-chemistry-concepts
Random-Error---ans-✔✔Errors-cannot-be-fixed-and-therefore-can-only-be-accounted-for
Systematic-Error---ans-✔✔Errors-that-always-occurs-in-the-same-direction;-can-be-fixed
Find-the-density-of-a-substance-that-has-a-mass-of-49.87g-and-a-volume-of-50.0mL---ans-
✔✔Density-=-Mass/Volume
Density-=-49.87g/50.0mL
An-aqueous-solution-of-calcium-carbonate-(CaCO3)-does-not-make-the-light-bulb-light-up.-
Use-chemical-terminology-to-explain-why-this-might-be---ans-✔✔CaCO3-does-not-
conduct-electricity-or-ionize-in-solutions-because-it-is-a-nonelectrolyte
Dissociation---ans-✔✔Substance-breaks-down-into-components-of-ions-(does-not-include-
nonelectrolytes)
Solubility---ans-✔✔The-ability-of-a-substance-to-dissolve-in-another-(includes-strong,-
weak,-and-nonelectrolytes);-not-dependent-on-amount-of-ionization
Classify-each-of-the-following-compounds-as-either-strong-electrolyte,-weak-electrolyte,-
or-a-nonelectrolyte
a.-Sodium-Chloride-(NaCl)
b.-Hydrochloric-Acid-(HCl)
c.-Sugar-(Glycose)---ans-✔✔a.-Strong-electrolyte
b.-Strong-electrolyte
c.-Nonelectrolyte
Weak-Electrolytes---ans-✔✔Compounds-whose-solutions-contain-a-small-fraction-of-the-
solute-in-the-form-of-ions-and-conduct-small-amounts-of-current
Ex.-NH3
Strong-Electrolytes---ans-✔✔Compounds-whose-solutions-contain-a-large-fraction-of-the-
solute-in-the-form-of-ions-and-conduct-large-amounts-of-current
Ex.-NaOH,-H2SO4
A-chemical-reaction-was-carried-out-using-23.5mL-of-1.2M-acetic-acid.-How-many-moles-
of-CH3COOH-were-used?---ans-✔✔Moles-=-Molarity-(M)-x-Volume-(L)
Moles-=-1.2M-x-0.0235L
Aqueous-Solution---ans-✔✔A-solution-composed-of-multiple-substances,-typically-a-
solute-and-H2O
QUESTIONS ANNSWERS
True-or-False:-If-you-are-late-to-class,-you-can-take-the-quiz-after-the-lab-is-over---ans-
✔✔False
List-4-pieces-of-PPE-(personal-protective-equipment)-that-must-always-be-worn-in-the-
lab---ans-✔✔--Safety-goggles
--Lab-coat
--Long-pants/skirts
--No-crop-tops
--Long-hair-tied-up
True-or-False:-The-volume-of-a-mixture-is-always-the-same-as-the-sum-of-the-individual-
volumes---ans-✔✔False
Ex.-When-mixing-10mL-of-rubbing-alcohol-with-10mL-of-water,-the-total-volume-will-be-
less-than-20mL
Is-the-mass-of-a-mixture-always-the-sum-of-the-individual-masses?-How-is-that-different-
than-volume?---ans-✔✔Yes,-due-to-the-law-of-consideration-of-mass,-masses-are-
additive.-Volumes-are-not-additive-due-to-the-different-molecular-components-of-each-
liquid-(size-of-molecules)
What-is-your-GTA's-name?---ans-✔✔Krystal-Baez
Accuracy---ans-✔✔How-close-a-measurement-is-to-the-true/actual-value
Precision---ans-✔✔How-close-together,-or-common,-the-measurements-are
How-would-you-round-a-graduated-cylinder-measurement?---ans-✔✔Ex.-2.65
How-does-TD-dictate-how-glassware-is-used-in-the-lab?---ans-✔✔TD-=-To-deliver-a-liquid
Ex.-Pipettes,-burets
How-does-TC-dictate-how-glassware-is-used-in-the-lab?---ans-✔✔TC-=-To-contain
Ex.-Beaker,-volumetric-flask
, Why-are-students-expected-to-develop-their-own-experimental-procedures-in-the-
chemistry-lab?---ans-✔✔To-develop-critical-thinking-skills-and-increase-their-
understanding-of-chemistry-concepts
Random-Error---ans-✔✔Errors-cannot-be-fixed-and-therefore-can-only-be-accounted-for
Systematic-Error---ans-✔✔Errors-that-always-occurs-in-the-same-direction;-can-be-fixed
Find-the-density-of-a-substance-that-has-a-mass-of-49.87g-and-a-volume-of-50.0mL---ans-
✔✔Density-=-Mass/Volume
Density-=-49.87g/50.0mL
An-aqueous-solution-of-calcium-carbonate-(CaCO3)-does-not-make-the-light-bulb-light-up.-
Use-chemical-terminology-to-explain-why-this-might-be---ans-✔✔CaCO3-does-not-
conduct-electricity-or-ionize-in-solutions-because-it-is-a-nonelectrolyte
Dissociation---ans-✔✔Substance-breaks-down-into-components-of-ions-(does-not-include-
nonelectrolytes)
Solubility---ans-✔✔The-ability-of-a-substance-to-dissolve-in-another-(includes-strong,-
weak,-and-nonelectrolytes);-not-dependent-on-amount-of-ionization
Classify-each-of-the-following-compounds-as-either-strong-electrolyte,-weak-electrolyte,-
or-a-nonelectrolyte
a.-Sodium-Chloride-(NaCl)
b.-Hydrochloric-Acid-(HCl)
c.-Sugar-(Glycose)---ans-✔✔a.-Strong-electrolyte
b.-Strong-electrolyte
c.-Nonelectrolyte
Weak-Electrolytes---ans-✔✔Compounds-whose-solutions-contain-a-small-fraction-of-the-
solute-in-the-form-of-ions-and-conduct-small-amounts-of-current
Ex.-NH3
Strong-Electrolytes---ans-✔✔Compounds-whose-solutions-contain-a-large-fraction-of-the-
solute-in-the-form-of-ions-and-conduct-large-amounts-of-current
Ex.-NaOH,-H2SO4
A-chemical-reaction-was-carried-out-using-23.5mL-of-1.2M-acetic-acid.-How-many-moles-
of-CH3COOH-were-used?---ans-✔✔Moles-=-Molarity-(M)-x-Volume-(L)
Moles-=-1.2M-x-0.0235L
Aqueous-Solution---ans-✔✔A-solution-composed-of-multiple-substances,-typically-a-
solute-and-H2O
