CHEM 120 Week 5 Exam 2 (Units 3 and 4)

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Contributor

Ellyse Perry

Category

Chemistry

Course

CHEM 120 Introduction to General, Organic & Biological Chemistry with Lab

Institute

Chamberlain

Pages

9

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A solution is prepared by dissolving 50 g of KCl (74.6 g/mol) to a volume of 1 L. What is the molarity of this solution? 50 M 0.67 M M 670 M 1.49 M You prepare a solution by dissolving 20 g of NaCl to a volume of 350 mL in water. What is the mass/volume % concentration of this solution? % NaCL 5.7% NaCl NaCl YES 25% NaCl When the following reaction goes in the forward direction, what is the base? NH4+ (aq) + H2O(l) ⇌ NH3 (aq) + H3O+(aq) 4 NH + H2O NH3 YES H3O+ You are preparing a buffered solution. So far, your solution contains H2PO4- ions, what would you add to this solution to prepare your buffer system? 4 H3PO4 NaHPO - YES HCl Cl- Select all examples where the Law of Conservation of Mass in not being followed. Select all that apply. H2 + O2 → H2O HCl + Mg(OH)2 → 2 H 2 O + MgCl 2 YES NaOH + H3PO4 → H2O + Na3PO4 YES S8(g) + 8 Ag(s) → 8 AgS Balance the following chemical equation: FeBr3 + H2O → HBr + Fe2O3 (4 points). Fe2O3+6HBr——> 2FeBR3 + 3H20 What would be the products of the neutralization equation below. Select all that apply! HCl + Al(OH)3 → AlCl OHCl H2O YES AlCl3 YES AlOCl Calculate the Volume, i

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