CHEM 121 FINAL EXAM QUESTIONS AND CORRECT ANSWERS – LATEST UPDATE 2026/2027 | GRADED A+ | ASSURED PASS.

CHEM 121 FINAL EXAM QUESTIONS AND CORRECT ANSWERS – LATEST UPDATE 2026/2027 | GRADED A+ | ASSURED PASS. Do the three conversions shown below, showing all work: 1. 328 K = ? oC 2. 76oC = ? oF 3. 135oF = ? K 1. 328K - 273 = 55 oC K → oC (make smaller) -273 2. 76oC x 1.8 + 32 = 168.8 oF oC → oF (make larger) x 1.8 + 32 3. 135oF - 32 ÷ 1.8 = 57.2 + 273 = 330.2 K oF → oC →K Question 2 You may find the following resources helpful: Scientific Calculator (Links to an external site.) Periodic Table Equation Table Classify each of the following 3 as an element, compound, solution or heterogeneous mixture and explain your answer. 1. Pepperoni Pizza 2. Potassium oxide 3. Phosphorus 1. Heterogeneous Mixture; Pepperoni Pizza - is not on periodic table (not element) - no element names (not compound)appears as more than one substance (dough, cheese, pepperoni) = Hetero Mix 2. Compound; Potassium oxide - is not on periodic table (not element) - has two element names = Compound 3. Element; Phosphorus - is on periodic table = Element Question 4 You may find the following resources helpful: Scientific Calculator (Links to an external site.) Periodic Table Equation Table Balance each of the following 3 equations by placing coefficients in front of each substance. C8H18 + O2 → CO2 + H2O Cl2 + O2 → Cl2O7 Ca(OH)2 + H3PO4 → Ca3(PO4)2 + H2O 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O 2 Cl2 + 7 O2 → 2 Cl2O7 3 Ca(OH)2 + 2 H3PO4 → Ca3(PO4)2 + 6 H2O Question 5 You may find the following resources helpful: Scientific Calculator (Links to an external site.) Periodic Table Equation Table Question 3 You may find the following resources helpful: Scientific Calculator (Links to an external site.) Periodic Table Equation Table Show the calculation of the number of grams in the given amount of the following 2 substances. Report your answer to 1 place after the decimal.