ALEKS Math case studies
ALEKS Math · Put your knowledge to work in context.
ALEKS is not a single certification exam but a family of adaptive, online learning and assessment products from McGraw Hill, used in K-12, higher education, and independent study. Its course products cover Math, Chemistry, Statistics, Accounting, and more, and it is also used for course placement. The ALEKS Math case studies are 5 cases and about 1,764 words.
1Diluting a Stock Solution for a Lab Experiment
A student needs to prepare 250.0 mL of a 0.150 M copper(II) sulfate solution for an experiment. The lab has a stock bottle of 1.20 M CuSO4 solution and distilled water.
356 words, about 2 min2Limiting Reactant and Percent Yield in a Precipitation Reaction
A student mixes 50.0 mL of 0.200 M silver nitrate (AgNO3) with 50.0 mL of 0.150 M sodium chloride (NaCl) to produce silver chloride (AgCl) precipitate and sodium nitrate (NaNO3) in solution. The balanced equation is AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq).
334 words, about 2 min3Solving a System of Equations from a Mixture Problem
A chemistry student is given a 100.0 mL mixture of two solutions: one containing 0.500 M HCl and the other containing 0.300 M HCl. The student is told that the total amount of HCl in the mixture is 0.0420 moles.
313 words, about 2 min4Interpreting a Graph of Absorbance vs. Concentration
A student prepares a series of standard solutions of a colored compound and measures their absorbance using a spectrophotometer. The data are plotted with concentration (M) on the x-axis and absorbance on the y-axis.
356 words, about 2 min5Unit Conversion and Significant Figures in a Chemical Calculation
A student is calculating the number of moles of gas in a 2.50 L container at 25.0 °C and 1.20 atm using the ideal gas law, PV = nRT, where R = 0.08206 L·atm/(mol·K). The student performs the calculation and reports the answer as 0.123 mol.
405 words, about 2 min