CHEM 120 DeVry Week 3 Quiz Latest

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CHEM 120 DeVry Week 3 Quiz Latest

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CHEM 120 DeVry Week 3 Quiz Latest

CHEM120

CHEM 120 DeVry Week 3 Quiz Latest

  1. Question : (TCO 5)A reaction that releases energy as it occurs is classified as a(n) _______; while a reaction that absorbs energy as it occurs is classified as a(n) ________.
  • catalyzed reaction; Uncatalyzed reaction
  • exothermic reaction; endothermic reaction
  • endothermic reaction; Exothermic reaction
  • oxidation reaction; redox reaction

Question 2. Question : (TCO 5) Which coefficient is placed in front of H2O to balance the following equation? Ca(OH)2 + HCl —> CaCl2 + ? H2O

  • 1
  • 2
  • 3
  • 4
  • 5

Question 3. Question : (TCO 5) Which coefficient is placed in front of Potassium to balance the following equation? K + H2SO4 —> K2SO4 + H2

  • 5
  • 1
  • 4
  • 2
  • 3

Question 4. Question : (TCO 5) Magnesium reacts with H3PO4 to form magnesium phosphate and has the following balanced chemical equation: 3 Mg + 2 H3PO4 –> Mg3(PO4)2 + 3 H2

How many mole(s) of Mg3(PO4)2 are produced when 4 mole H3PO4 reacts completely?

  • 1 mole
  • 4 mole
  • 10 mole
  • 6 mole
  • 2 mole

Question 5. Question : (TCO 5) Magnesium reacts with oxygen to form magnesium oxide and has the following balanced chemical equation: 2 Mg + O2 –> 2 MgO. How many mole(s) of MgO are produced when 5 mole O2 reacts completely?

  • 20 mole
  • 4 mole
  • 10 mole
  • 5 mole
  • 2.5 mole

Question 6. Question : (TCO 5) (a) Determine the number of atoms for each element present in the following molecule: Na2CO3 (2 points).

(b) Using the periodic table of elements, determine the molar mass for this molecule (3 points).

Show your work. t B

Question 7. Question : (TCO 5) (a) Determine the number of atoms for each element present in the following molecule: Al(OH)3 (2 points).

(b) Using the periodic table of elements, determine the molar mass for this molecule (3 points).

Show your work.

Question 8. Question : (TCO 7) You are asked to calculate the concentration of a NaCl (in water) solution in several ways and are given the following information: 25 g NaCl, 500 mL solution, Molecular weight of NaCl = 58.44 g/mole. Students must show ALL work for parts a and b.

(a) Calculate the mass/volume percent concentration (4 points).

(b) Calculate the molarity of the solution (6 points).

Question 9. Question : (TCO 7) What volume (L) of a 0.5 M KOH solution can be prepared by diluting 1.5 L of a 10 M KOH solution?

Show your work.