Instructions: Questions 1-10 (2.5 pts each) must be answered on the Seantron she

Question

Instructions: Questions 1-10 (2.5 pts each) must be answered on the Seantron sheet by filling in the appropriate bubble. No cell phone or electronic device is allowed provided to you h-6.626x 10-34 J-s; c-3.00 x 10° m/s, aE-(-2.18 × 10-) 1· which of the following are strong electrolytes? A) HCIO,, NH, KCI, Ca(OH B) HC 2. What volume (mL) of a concentrated solution of magnesium chloride (0.00 M) must be dilued to 350.ml to make a 2.75 M solution of magnesium chloride? A) 2.75 B) 50.0 c)45.0 D) 107 E) 350 Which combination will produce a precipitate? A) KOH (aq) and HNO, (aq) C)) Pb(NO)h (aq) and HCI (aq) E) NaOH (aq) and Sr(NO,)2 (aq) 3. B)Cu(NOh (aq) and KC,H,02 (aq) DAgH,O(ag) and HC,H,0,(a) 4. Complete the equation and indicate if a precipitate forms. C) AgBrís)+KNO,(s) A) AgNO,(8)+ K+BrB) AgBr(s)+K+NO E) no reaction D) KNO,(s) +Ag+Br

Explanation / Answer

1)

HC2H3O2 is acetic acid. This is weak acid and hence weak electrolyte

NH3 is a weak base and hence weak electrolyte

So, they both should not be part of answer

Answer: C

2)

use dilution formula

M1*V1 = M2*V2

Here:

M1 is molarity of solution before dilution

M2 is molarity of solution after dilution

V1 is volume of solution before dilution

V2 is volume of solution after dilution

we have:

M1 = 9.0 M

M2 = 2.75 M

V2 = 350.0 mL

we have below equation to be used:

M1*V1 = M2*V2

V1 = (M2 * V2) / M1

V1 = (2.75*350)/9

V1 = 107 mL

Answer: 107 mL

Feel free to comment below if you have any doubts or if this answer do not work

Only 1 question at a time please

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