Question 1

A student dissolves 45.4 g of NaCl in 350 mL of water. What is the molarity of the resulting solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$2.22\ \mathrm{M}$$

Question 2

Which of the following compounds is insoluble in water?

Accepted Answer

AgBr

Question 3

In the reaction $$\mathrm{$$NCl_3$$(l) + 3H_2O(l) \rightarrow NH_3$(g) + 3HOCl(aq)}$$, what is the oxidation state of nitrogen in $$\mathrm{$$NCl_3$$}$$?

Accepted Answer

$$-3$$

Question 4

Which element undergoes oxidation in the reaction $$\mathrm{$$NCl_3$$(l) + 3H_2O(l) \rightarrow NH_3$(g) + 3HOCl(aq)}$$?

Accepted Answer

N

Question 5

Which of the following are physical changes?

Accepted Answer

II and III

Question 6

Which of the following metals will reduce $$\mathrm{Cr$$^{3+}$$} to$$ $$\mathrm{Cr}$$ according to the activity series?

Accepted Answer

I, II, and III

Question 7

If you dilute $$25.3\ \mathrm{mL} of $$concentrated sulfuric acid ($$18.4\ \mathrm{M}) to a $$total volume of $$600\ \mathrm{mL}$$, what is the molarity of the dilute acid?

Accepted Answer

$$0.825\ \mathrm{M}$$

Question 8

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 9

In the reaction $$\mathrm{HClO(aq) + KOH(aq) \rightarrow KClO(aq) + H_2O(l)}$$, which ions are spectator ions?

Accepted Answer

II and III

Question 10

What is the oxidation state of phosphorus in $$\mathrm{Na_3PO_4}$$?

Accepted Answer

$$+5$$

Question 11

Which of the following statements are true for $$\mathrm{$$HClO_3$$}$$?

Accepted Answer

I and III

Question 12

How many grams of $$\mathrm{I_2$}$$ are required to produce $$0.050\ \mathrm{g} of$$ $$\mathrm{S} in $$the reaction $$\mathrm{CdS(s) + I_2$(g) + 2HCl(aq) \rightarrow $$CdCl_2$$(aq) + 2HI(aq) + S(s)}$$? (Molar mass: S = 32.07 g/mol, I$$_2 = 253.8 g/$$mol)

Accepted Answer

$$0.40$$

Question 13

All compounds containing which ion are water soluble?

Accepted Answer

$$\mathrm{Li^+}$$

Question 14

What is the oxidation state of chromium in $$\mathrm{Cr_2O_7$$^{2-}$$}$$?

Accepted Answer

$$+6$$

Question 15

Which of the following is soluble in water?

Accepted Answer

$$\mathrm{Ca(C_2H_3O_2)_2}$$

Question 16

What is the molarity of a solution prepared by dissolving $$460\ \mathrm{mg} of$$ $$\mathrm{$$CaBr_2$$} in$$ $$150\ \mathrm{mL} of $$water? (Molar mass of $$\mathrm{$$CaBr_2$$}$$ = $$199.89\ \mathrm{g/mol})$$

Accepted Answer

$$0.0116\ \mathrm{M}$$

Question 17

Which of the following statements is true for the reaction $$2\mathrm{$$CaH_2$$} + \mathrm{$$TiO_2$$} \rightarrow \mathrm{Ti} + 2\mathrm{CaO} + 2\mathrm{H_2$}$$?

Accepted Answer

A, B, and C are true.

Question 18

How many moles of $$\mathrm{H_2$}$$ would be produced by the reaction of $$0.40$$ moles $$\mathrm{$$CaH_2$$}$$ with excess $$\mathrm{$$TiO_2$$}$$?

Accepted Answer

$$0.20$$

Question 19

Which of the following ions always forms water-soluble compounds?

Accepted Answer

$$\mathrm{NH_4$^+}$$

Question 20

What is the solvent in an aqueous solution?

Accepted Answer

water

CHEM 1364 Exam 3 – Step-by-Step Study Guidance

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