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Chemistry 1411

 Practice questions for Exam 3 (Chapter 6-Part 2)

(Note: Pease aso refer to !asterin"chemistry qui# questions an$ cass practice questions)

1) Molarity is defined asA) moles of solute per liter of solution.B) moles of solute per liter of solvent.

C) moles of solvent per liter of solution.

D) moles of solvent per liter of solvent.

Answer: A

2) What is the concentration of eCl! in a solution prepared "y dissolvin# 1$.$ # of eCl! in

enou#h water to ma%e 2&' m( of solution

A) 2.2* + 1$,* MB) $.22* M

C) *.*- MD) *.*- + 1$! M

Answer: B

!) ow many #rams of A#/0! are needed to ma%e 2'$. m( of a solution that is $.1!' M

A) $.$1& #

B) $.1&* #C) '.&! #

D) .1& #

Answer: C

*) What volume of a $.'*$ M /a0 solution contains 1'.' # of /a0A) $.2$ (

B) $.&1 (C) 1.! (

D) *.& (

Answer: B 

') Which statement a"out diluted solutions is false When a solution is diluted

A) the concentration of the solution decreases.B) the molarity of the solution decreases.

C) the num"er of moles of solute remains unchan#ed.

D) the num"er of moles of solvent remains unchan#ed.Answer: D

-) What is the concentration of Cl in the final solution when -' m( of a 12 M Cl solution is

diluted with pure water to a total volume of $.1' (

A) 2. + 1$,2 MB) '.2 M

C) 2 M

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D) '.2 + 1$! M

Answer: B

&) ow many milliliters of a .$ M 230* solution are needed to ma%e $.2' ( of a !.' M

230* solution

A) $.$& m(B) $.-* m(

C) & m(D) -*$ m(

Answer: C

) ow many m( of a $.1&' M eCl! solution are needed to ma%e 2'$. m( of a solution that is

$.!$$ M in Cl, ionA) $.*2 m(

B) 1*! m(

C) *2 m(D) 4t is not possi"le to ma%e a more concentrated solution from a less concentrated solution.

Answer: B

) A student prepared a stoc% solution "y dissolvin# 2$.$ # of 50 in enou#h water to ma%e1'$. m( of solution. 3he then too% 1'.$ m( of the stoc% solution and diluted it with enou#h

water to ma%e -'.$ m( of a final solution. What is the concentration of 50 for the final

solutionA) $.'* M

B) $.&1! M

C) 1.*$ MD) 1.2 M

Answer: A