Question 1

Which of the following statements best explains why aqueous CaCl$$_2$$ conducts electricity, but solid CaCl$$_2$$ does not?

Accepted Answer

In aqueous solution, CaCl$$_2$$ dissociates into ions that are free to move and carry charge.

Question 2

What is the concentration of Cl$$^-$$ ions in a 0.30 M CaCl$$_2$$ solution?

Accepted Answer

$$[\mathrm{Cl}^-] = 0.60\ \mathrm{M}$$

Question 3

Which of the following compounds will NOT conduct electricity when dissolved in water?

Accepted Answer

C$$_{12}H$_{22}O$_{11} ($$sucrose)

Question 4

Given the molecular equation: AgNO$$_3(aq) + $$NaCl(aq) $$\rightarrow$$ AgCl(s) + NaNO$$_3(aq$$), which ions are spectator ions?

Accepted Answer

Na$$^+$$ and NO$$_3^-$$

Question 5

Which of the following best describes a precipitation reaction?

Accepted Answer

Two soluble ionic reactants yield an insoluble solid product that drops out of solution.

Question 6

Which of the following is the correct net ionic equation for the reaction between CaCl$$_2(aq) $$and Na$$_2CO$_3(aq$$)?

Accepted Answer

$$\mathrm{Ca}^{2+}(aq) + \mathrm{CO}_3$$^{2-}$$(aq) \rightarrow \mathrm{CaCO}_3(s)$$

Question 7

Which compound is most likely to be insoluble in water according to the solubility guidelines?

Accepted Answer

BaSO$$_4$$

Question 8

A student mixes aqueous solutions of NiCl$$_2$$ and (NH$$_4$$)$$_2S. $$What is the precipitate formed?

Accepted Answer

NiS

Question 9

Which of the following is a correct ionic equation for the reaction: AgNO$$_3(aq) + $$NaCl(aq) $$\rightarrow$$ AgCl(s) + NaNO$$_3(aq$$)?

Accepted Answer

$$\mathrm{Ag}^+(aq) + \mathrm{NO}_3^-(aq) + \mathrm{Na}^+(aq) + \mathrm{Cl}^-(aq) \rightarrow \mathrm{AgCl}(s) + \mathrm{Na}^+(aq) + \mathrm{NO}_3^-(aq)$$

Question 10

Which of the following best explains why aqueous sucrose does NOT conduct electricity?

Accepted Answer

Sucrose dissolves as molecules and does not form ions in water.

Question 11

If 0.25 mol of Na$$_2CO$_3 is $$dissolved in enough water to make 1.0 L of solution, what is the concentration of Na$$^+$$ ions?

Accepted Answer

$$[\mathrm{Na}^+] = 0.50\ \mathrm{M}$$

Question 12

Which of the following is a correct molecular equation for the precipitation reaction between Pb(NO$$_3$$)$$_2(aq) $$and K$$_2$$CrO$$_4(aq$$)?

Accepted Answer

$$\mathrm{Pb(NO}_3)_2(aq) + \mathrm{K}_2\mathrm{CrO}_4(aq) \rightarrow \mathrm{PbCrO}_4(s) + 2\mathrm{KNO}_3(aq)$$

Question 13

Which of the following is NOT a type of chemical reaction classification discussed in the study materials?

Accepted Answer

Combustion

Question 14

Which of the following compounds is soluble in water according to the solubility guidelines?

Accepted Answer

NH$$_4_2$SO_4$

Question 15

A mixture of CaCO$$_3$$ and H$$_2O $$does not conduct electricity. What is the best explanation?

Accepted Answer

CaCO$$_3 is $$insoluble in water and does not dissociate into ions.

Question 16

Which of the following is the correct dissolution reaction for Na$$_2CO$_3 in $$water?

Accepted Answer

$$\mathrm{Na}_2\mathrm{CO}_3(s) \xrightarrow{H_2O} 2\mathrm{Na}^+(aq) + \mathrm{CO}_3$$^{2-}$$(aq)$$

Question 17

Which of the following is a correct net ionic equation for the precipitation reaction between Pb(NO$$_3$$)$$_2(aq) $$and K$$_2$$CrO$$_4(aq$$)?

Accepted Answer

$$\mathrm{Pb}^{2+}(aq) + \mathrm{CrO}_4$$^{2-}$$(aq) \rightarrow \mathrm{PbCrO}_4(s)$$

Question 18

Which of the following is true about soluble covalent compounds in water?

Accepted Answer

They remain as molecules and do not dissociate into ions.

Question 19

If 0.40 mol of CaCl$$_2 is $$dissolved in 1.0 L of water, what is the concentration of Ca$$^{2+}$$ ions?

Accepted Answer

$$[\mathrm{Ca}^{2+}] = 0.40\ \mathrm{M}$$

Precipitation Reactions and Aqueous Solutions: Conductivity, Dissolution, and Solubility Guidelines

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