Mark True (A) or False (B) (2 points each) 1. Magnesium has similar physical and

Question

Mark True (A) or False (B) (2 points each) 1. Magnesium has similar physical and chemical properties as sodium. 2. The central atom in the Lewis structure of CIF3 (chlorine trifluoride) is fluorine.F 3. After heating, the anhydrous salt will weigh more than the hydrate. 4. The volume reading of the buret increases as you go down. 5. Phenolphthalein turns pink in base solutions. 6. A non-electrolyte would be a good conductor of electricity Multiple Choice (3 points each) 7. A student obtains the following flame test results: Color yellow Na CO, BaCl Sr(NOsh Mg(OH)2 no color A flame test on a solution of Ba(NOsh will produce the color a. yellow b. red c. green d. violet e. no color 8. Na CO, solution forms precipitates with solutions of MgCh, CaCl2, SrCh, and BaCl2 One predicts that Na,CO, will also form a precipitate with d. Sr(NOs2 a. NaCi b. LINO c. Lici e. All of the above 9. You are given a solution of 14.8 M NHs. How many milliliters of this solution are needed to dilute to a 100.0 mL of 1.00 M NH3? a. 0.148 mL b. 6.76 mL c. 93.2 mL d. 85.2 ml e. 1.5 mL 10. To determine the unknown concentration of a solution, you would use a. flame test b. solubility test c. titration d. filtration e decantation 11. In the following calculation: (0.957-0.901) x 6.32, how many significant figures would your answer be in? a. 1 b. 2 c. 3 d. 4 e. 12. Which of the following ionic solutions will produce CO2 gas when reacted with an acid? a. Ca(OH)2 d. CaSO4 b. CaCO c. CaCl2 e. None of these

Explanation / Answer

Q7

if BaCl2 = Ba2+ produced green

then

Ba(NO3)2 = Ba+2 should produce green color as well, since Ba2+ has the unique color

Q8

Na2CO3 should form preicpitate as well with Sr(NO3)2

since it is the only Group II metal

Q9

M1V1 = M2V2

14.8*V = 100*1

V = 100/14.8

V = 6.76 mL required

Q10

typically, we use titration

Q1

it should have 3 sig fig, since all species have 3 sig fig

Q12

CaCO3 + H+ = Ca+2 + CO2 + H2O

choose CaCO3

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