after turning in the te your pencil, eraser and calculator. You can leave the ro
ID: 104906 • Letter: A
Question
after turning in the te your pencil, eraser and calculator. You can leave the room only TOTAL POINTS: 200 Q1-12 (5 points each) Multiple Choice Questions 1. The name of Cu:O is (a) copper (Il) oxide (b) copper () oxide () dicopper monoxide(d) copper oxide 2. The name of NCls is (a) nitrogen(II) chloride (b) nitrogen chloride (c) nitrogen trichoride (d) nitrogen trichlo 3. Identify the complete and proper formula for magnesium hydroxide (a) Mn(OH)2 (b) MnOH (c) MglOH) (d) Mg OH 4. What is the correct formula for sulfuric acid? (a) HS (b) H:S (c) H:So, (d) HSOA e) H:SO 5. What volume of 0.200 M Na CO, (mw 106) solution contains 53.0 g of Na COs? (a) 0.200L (b) 0.400 L (c)0.500L (d) 1.60L (e) 2.50L 6. Consider the reaction: CsHa + 502- 3CO2 + 4H20 How many grams of oxygen is required to burn 8.8 g of CaHs according to the above reaction? (a) 8 (b) 12 (c) 16 (d) 32 (e ) 64 How many moles of ammonia can be made by reacting 5.0 mol of N2 with 4.0 mol of Ha? N2(g) + 3 H2(g) 2NH3(g) (c) 5.0 mol (d) 9.0 mol (e) 10.0 mol (a) 2.7 mol (b) 4.0 mol 8. How many moles of gas occupy 0.500 L at 170 mm Hg and 25 C? (e ) 3.85 (b) 0.00500 () 2.18 (d) 3.48 (a) 0.00457 9. A precipitate is expected when which of the following solutions are combined? (a) KI(aq) + Na SO4(aq) (b) Kl(aq) FeCl (aq) (c) Kl(aq) Ca(C2Ha02)2(aq) (d) KI(aq) + Pb(NOs)2(aq) 10.What is the balanced net ionic equation between HC2Hs02 and NaOH? (a) Hc2H3O2 + 20H 2CO2 + 2 H20 + 2 H. (c) H. + OHH20 (d) HGH,02 + NaOH NaC2H30t Hz 6IIExplanation / Answer
1)
The answer is B. In Cu2O, copper exists Cu+1 and Oxygen exists as O-2
So it is called as Copper(I) oxide
2)The answer is C.
NCl3 is called as Nitrogen trichloride
3)The answer is C
The formula of Magnesium hydroxide is Mg(OH)2 Mg+2 and OH-
4)The answer is E
The formula of Sulfuric acid is H2SO4
5)mass of Na2CO3 = 53.0grams
Molar mass of Na2CO3 = 106 gram/mole
number of moles of Na2CO3 = 53.0/106 = 0.5 mole
Molarity = 0.200 M
Molarity = number of moles/volume in L
Volume in L = number ofmoles/molarity = 0.5/0.2 = 2.50 L
volume = 2.50L
The answer is E
8)
PV= nRT
n= PV/RT =170/760 x0.500/0.0821 x298= 0.00457 moles
The answer is A
9)2 KI(aq) + Pb(NO3)2(aq) --------------- PbI2(s) + 2 KNO3(aq)
The answer is D
10)HC2H3O2 + NaOH---------------- C2H3O2Na + H2O
H+ + C2H3O2- + Na+ + OH- ------------- C2H3O2- + Na+ + H2O
H+ + OH- --------------- H2O
The answer isC.
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