Practice Quiz 4




1.

A particular reaction may be both a precipitation and an acid-base (neutralization) reaction.

A. True
B. False


2.

Which of the following is a strong acid?

A.

H3PO4

B.

HNO3

C.

HF

D.

CH3COOH

E.

H2O



3.

In a redox reaction, the oxidizing agent undergoes loss of electrons.

A. True
B. False


4.

a. You are provided with a 250 mL volumetric flask, deionized water and solid NaOH. How much NaOH should be weighed out in order to make 250. mL of 0.100 M solution?
b. 25.0 mL of the 0.100 M aqueous NaOH is titrated against sulfuric acid, H2SO4, according to the equation
2NaOH(aq)    +    H2SO4(aq)    →    Na2SO4(aq)    +    2H2O(l)
If the volume of sulfuric acid solution required to neutralize the NaOH is 18.62 mL, what is its concentration?


Answer:


5.

Select the classification for the following reaction.
2NaCl(l)         2Na(l)    +    Cl2(g)

A.

acid-base

B.

precipitation

C.

combination

D.

displacement

E.

decomposition



6.

Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II) nitrate

A.

CuS

B.

Cu2S

C.

NH4NO3

D.

NH4(NO3)2

E.

CuSO4



7.

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed.
CuCl2(aq)    +    Na2CO3(aq)    →

A.

copper(I) carbonate, Cu2CO3

B.

copper(II) carbonate, Cu2CO3

C.

copper(I) carbonate, CuCO3

D.

copper(II) carbonate, CuCO3

E.

sodium chloride, NaCl



8.

Select the classification for the following reaction.
NH3(aq)    +    HNO3(aq)   →    NH4NO3(aq)

A.

precipitation

B.

acid-base

C.

redox

D.

decomposition

E.

none of the above



9.

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed.
CoSO4(aq)    +    (NH4)3PO4(aq)    →

A.

cobalt(II) phosphate, Co3(PO4)2

B.

cobalt(III) phosphate, Co3(PO4)2

C.

cobalt(II) phosphate, CoPO4

D.

cobalt(III) phosphate, CoPO4

E.

ammonium sulfate, (NH4)2SO4



10.

a. Explain or define what is meant by the term “oxidation.”
b. Write down the oxidation numbers of the atoms in the following formulas.
K2Cr2O7 NaH
K: Cr: O: Na: H:


Answer:


11.

How many moles of H+(aq) ions are present in 750 mL of 0.65 M hydrochloric acid?

A.

1.2 mol

B.

0.98 mol

C.

0.87 mo1

D.

0.65 mol

E.

0.49 mol



12.

Select the classification for the following reaction.
2I-(aq)   +   Cl2(aq)   →   I2(aq)   +   2Cl -(aq)

A.

combination

B.

displacement

C.

decomposition

D.

precipitation

E.

acid-base



13.

In a redox reaction, the reducing agent undergoes loss of electrons.

A. True
B. False


14.

Potassium carbonate, K2CO3, sodium iodide, NaI, magnesium chloride, MgCl2, methanol, CH3OH, and ammonium chloride, NH4Cl, are soluble in water. Which produces the largest number of dissolved particles per mole of dissolved solute?

A.

K2CO3

B.

NaI

C.

MgCl2

D.

CH3OH

E.

NH4Cl



15.

Sulfuric acid (H2SO4) reacts with potassium hydroxide (KOH) as follows.
H2SO4(aq)    +    2KOH(aq)    →    K2SO4(aq)    +    2H2O(l)
Calculate the volume of 0.100 M sulfuric acid required to neutralize 25.0 mL of 0.0821 M KOH. Show all your work.


Answer:


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