When 261 g of solid Na 2 CO 3 is dissolved in sufficient...

This preview shows page 1 - 3 out of 7 pages.

Exam 2 1307 s18.pdf

1 )   When 2.61 g of solid Na 2 CO 3 is dissolved in sufficient water to make 250 . m L of solution , the concentration of Na 2 CO 3 is :
A ) 0.0246 M
B ) 10.4 M
C ) 0.205 M
D ) 0.141 M
E ) 0.0985 M
2 )   How many moles of H + ( aq ) ions are present in 750 m L of 0.65 M hydrochloric acid ?
Get answer to your question and much more
3 )   Which one of the following ionic compounds is insoluble in water ?
Get answer to your question and much more
4 )   What , if any , are the spectator ions when aqueous solutions of HBr and R bOH neutralize each other ?
Get answer to your question and much more
5 )   Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper ( II ) nitrate .
A ) CuSO 4
B ) Cu 2 S
C ) NH 4 NO 3
D ) CuS
E ) NH 4 ( NO 3 ) 2
Answer:  A )   CuS
7 )   Which of the following is a weak acid ?
Get answer to your question and much more
8 )   A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution . If 46.33 m L of NaOH is needed to neutralize 10.00 m L of the acid , what is the molar concentration of the acid ?
Get answer to your question and much more
9 )   Calculate the oxidation number of the chlorine in perchloric acid , HClO 4 , a strong oxidizing agent .
Get answer to your question and much more
10 )   A sample of an ideal gas has its volume doubled while its temperature remains constant . If the original pressure was 100 torr , what is the new pressure ?
A ) 50 torr
B ) 1000 torr
C ) 200 torr
D ) 10 torr
E ) 100 torr
Answer:  B.   50 torr
11 )   A sample of carbon dioxide gas at 125°C and 248 torr occupies a volume of 275 L . What will the gas pressure be if the volume is increased to 321 L at 125°C ?
Get answer to your question and much more
12 )   A compressed gas cylinder containing 1.50 mol methane has a volume of 3.30 L . What pressure does the methane exert on the walls of the cylinder if its temperature is 25 ° C ?
Get answer to your question and much more
13 )   A flask with a volume of 3.16 L contains 9.33 grams of an unknown gas at 32.0 ° C and 1.00 atm . What is the molar mass of the gas ?
Get answer to your question and much more
14 )   A gas mixture , with a total pressure of 300 . torr , consists of equal masses of Ne ( atomic weight 20 . ) and Ar ( atomic weight 40 . ) . What is the partial pressure of Ar , in torr ?
A ) 100. torr
B ) 200 . torr
C ) 75 torr
D ) 150 . torr
E ) None of these choices are correct .
15 )   Magnesium metal ( 0.100 mol ) and a volume of aqueous hydrochloric acid that contains 0.500 mol of HCl are combined and react to completion . How many liters of hydrogen gas , measured at STP , are produced ? Mg ( s ) + 2HCl ( aq ) → MgCl 2 ( aq ) + H 2 ( g )
Get answer to your question and much more
16 )   Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc . A sample of 195 m L of hydrogen was collected over water at 25 ° C and 753 torr . What mass of hydrogen was collected ? ( P water = 24 torr at 25 ° C )
Get answer to your question and much more
17 )   Which of the following gases will be the slowest to diffuse through a room ?
Get answer to your question and much more
18 )   A system receives 575 J of heat and delivers 425 J of work . Calculate the change in the internal energy , Δ E , of the system .
A ) 1000 J
B ) – 150 J
C ) 150 J
D ) – l 000 J
E ) 575 J
19 )   In which of the following processes is Δ H = Δ E ?
Get answer to your question and much more
Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) When 2.61 g of solid Na 2 CO 3 is dissolved in sufficient water to make 250. mL of solution, the concentration of Na 2 CO 3 is: A) 0.0246 M B) 10.4 M C) 0.205 M D) 0.141 M E) 0.0985 M 1)
2) How many moles of H + ( aq ) ions are present in 750 mL of 0.65 M hydrochloric acid? 2)
3) Which one of the following ionic compounds is insoluble in water? 3 3)
4) What, if any, are the spectator ions when aqueous solutions of HBr and RbOH neutralize each other? + 4)
5) Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II) nitrate. A) CuSO 4 B) Cu 2 S C) NH 4 NO 3 D) CuS E) NH 4 (NO 3 ) 2 5)
6) Consider the reaction: 3Co 2+ ( aq ) + 6NO 3 ( aq ) + 6Na + ( aq ) + 2PO 4 3– ( aq ) Co 3 (PO 4 ) 2 ( s ) + 6Na + ( aq ) + 6NO 3 ( aq ) Identify the net ionic equation for this reaction. ) ) ) ) 6)
7) Which of the following is a weak acid? HBr 7)
A 1
A 2

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture