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CHEM 104 Final Exam Portage Learning
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what can serve as the solvent in a solution? liquid, solid, gas, or all of the above. - answer all of the above a homogeneous mixture consists of 12% ethanol, 28% methanol, and 60% water. what is the solvent? water, methanol, ethanol, or ethanol
- methanol - answer water in a solution, the solute is: - answer the substance that is dissolved example of colloid: grape juice, homogenized milk, blood, or kool-aid.
- answer homogenized milk example of suspension: blood, homogenized milk, apple juice, ormayo.
- answer blood unknown liquid that is insoluble in water but not in benzene (an aromatic hydrocarbon solvent). what type of molecule is unknown? polar, nonpolar, neither polar or non polar, or both polar and non polar
- answer nonpolar
solubility of in water decreases as temperature increases. liquids, solids, or gases? - answer gases which compound will be most soluble in hexane? CH3CH2OH CH3OH CH3CH2CH2OH - answer CH3CH2CH2OH water solution of sodium chloride is a good conductor of electricity. due to this property, table salt is classified as a(n): weak electrolyte, strong electrolyte, non-electrolyte, or semi- electrolyte - answer strong electrolyte example of a weak electrolyte MgCl2, HC2H3O2, HNO3, or KOH - answer HC2H3O in order to prevent the process off either crenation or hemolysis with red blood cells an intravenous solution concentration should be to the concentration of blood. hypotonic, hypertonic, isotonic, or all of the above. - answer isotonic
passive diffusion active transport facilitated diffusion all of the above none of the above - answer active transport identify the type of transport that will occur for the oxygenmolecules that requires no energy for transport passive diffusion active transport facilitated diffusion all of the above none of the above - answer none of the above predict which will fully dissociate (strong electrolyte) in water sugar organic acid pyruvic KCl all none - answer KCl
in order to prevent the process of either crenation or hemolysis with red blood cells an intravenous solution concentration should be to the concentration of blood. hypotonic hypertonic supersonic isotopic isotonic - answer isotonic the glucose transporter provides facilitated transport across the cell membrane. do you think this transporter is active after you eat a meal and after you wake up in the morning? active, active inactive, inactive active, inactive inactive, active - answer active, inactive example of a nonelectrolyte MgCl CH3COOH / HC2H3O
% v/v concentration of a sample of wine that contains 15 mL of ethyl alcohol in 200 mL of wine? a 0.075 % v/v b 6.9% v/v c 0.75% v/v d 0.069% v/v e 7.5% v/v - answer e 7.5% v/v glucose concentration in pp of a solution made by mixing 23.2 mg glucose with 2.000 L? 8.62ppm 11.6 ppm 1.16 ppm 0.862 ppm none of the above - answer 11.6 ppm calculate volume in L of a solution that contains 3.12 moles of NaCkif the concentration of this solution is 6.67 M NaCl? 2.14 L 20.8 L 46.8 L
0.468 L
none of the above - answer 0.468 L calculate volume in mL of a 2.75 M solution that must be used tomake 1.25 L of a 0.150 M solution. 0.0682 mL 68.2 mL 0.0330 mL 33.0 mL none of the above - answer 68.2 mL how many grams of AgNO3 are required to make 200.0 mL of a .010M solution? (Ag=108, N=14, O=16) 8.50 g 17.0 g 34.0 g 0.34 g none of the above - answer 0.34 g 7.450g of KCl is dissolved into a solution with a total volume of 125.0 mL. what is the molarity of the solution? (K=39, Cl = 35.5)
- none of the above - answer 0.
a patient has been trying to achieve total blood cholesterol of 175 mgor less per 100 mL. a recent test result of 2.0 mL blood sample found that 4.00 mg cholesterol were present. has the patient reached the goal? no. 4.00mg/2ml is more than his goal for cholesterol.yes. 4.00mg/2ml is equivalent to 200mg/100mL. no. the result 4.0 x 100/2.0 is much less than the goal. - answer yes. 4.00mg/2ml is equivalent to 200mg/100mL. an egg yolk with the volume of 4.00 mL contains 5 ug vitamin d (cholecalciferol). what is the concentration of vitamin d in ug / 100 mL? 12.5 ug/100mL 125.0 ug/100 mL 1.25 ug/100 mL 0.125 ug/ 100 mL none of the above - answer 125.0 ug/100 mL how many grams of a compound is present in 500 mL of a 5.0% mass/volume solution? 5.0 g
increases h+ when placed in water decreases h+ when placed in water acts as a proton acceptor in any system acts as a proton donor in any system - answer acts as a proton donorin any system a bronsted-lowry BASE is defined as a substance which: acts as a proton acceptor in any system acts as a proton donor in any system decreases h+ when placed in water increases h+ when placed in water - answer acts as a proton acceptor in any system which is the proton donor and which is the proton acceptor (to theleft side of the equation)? CO3- 2 (aq) + H2O (l) > HCO3- (aq) + OH - (aq) a donor: co3 - 2; acceptor: h b donor: h20; acceptor co3 2- c donor: hco3-; acceptor: oh- d donor: oh-; acceptor: hco3 answer b donor: h20; acceptor co3 2 -
which of the following cannot act as a bronzed-lowry acid? a) h2so b) so c) co3 - 2 d) hs- e) both b and c - answer e) both b and c identify the frosted-lowry acid and base respectively: NH3 + HCN --> NH4 + CN- NH3 and HCN HCN and NH NH4 and CN- NH3 and NH4 - answer HCN and NH which of the following is not a strong acid? HCl HNO HC2H3O 2 HClO4 - answer HC2H3O
the reaction rate of the reverse reaction is small compared to forward. the reaction rate of the forward reaction is small compared to the reverse. the amount of product and reactant is exactly equal. - answer the reaction rate of the forward reaction is equal to the rate of the reverse. which of ht following is the strongest weak acid? HCN (ka= 4.9 x 1o ^-10) HClO (ka= 3.0 x 10^-8) HNO2 (ka= 4.5 x 10 ^-4) HF (ka = 6.8 x 10^-4) - answer HF (ka = 6.8 x 10^-4)what is the conjugate base of OH-? H2O O- O O- 2 - answer O- 2
what is the conjugate acid of HS-? S - 2 H S HS- S- - answer H2S what is the conjugate acid of NH3-? NH4+ NH2- NH2+ NH4 - answer NH4+ calculate the ph of .00756m of hno
12.947 - answer 2. in an acidic solution, ph is _ and h30 is.
respiratory alkalosis metabolic acidosis metabolic alkalosis - answer metabolic acidosis which of the following buffers is the one that is mainly contained inour blood? hc2h3o2/c2h3o nh4/nh h2co3/hco hpo4 - 2/po4 - answer h2co3/hco when a person hyporventilates the condition is known as: respiratory acidosis respiratory alkatosis metabolic acidosis metabolic alkalosis - answer respiratory alkatosis hno2+h2o--> h3o+no the conjugate acid of water in the reaction is:
hno h2o h3o no2 - answer h3o the equation has the following equilibrium constant expression:n
- 3h2 --> 2nh k=n2 h2/nh k=nh3/n2 h k=n2 h2/nh3 2 k= (nh3) 2/ n2 h2 - answer k=( nh3) 2/ n2 h in the haber process for the production of ammonia, which will shift the equilibrium to the right? n2+ 3h2-> 2nh A increasing the concentration of n B increasing the concentration of h C increasing the concentration of nh D both a and b - answer D both a and b
