Question 1

A sample of hydrated magnesium sulfate ($$\mathrm{$$MgSO_4$$ \cdot xH_2O}) $$weighing 5.00 g is heated to drive off all water, leaving 2.44 g of anhydrous $$\mathrm{$$MgSO_4$$}. $$What is the value of $$x in $$the hydrate? (Molar masses: $$\mathrm{$$MgSO_4$$} = 120.4 g/$$mol, $$\mathrm{H_2O} = 18.0 g/$$mol)

Accepted Answer

$$x = 5$$

Question 2

Which of the following best describes the electron geometry and approximate bond angle of $$\mathrm{NH_3$}$$?

Accepted Answer

Tetrahedral, $$109.5^\circ$$

Question 3

A student mixes solutions of $$\mathrm{Na_2SO_4}$$ and $$\mathrm{Ba(NO_3$)_2}. $$What precipitate, if any, will form? Use solubility rules.

Accepted Answer

$$\mathrm{$$BaSO_4$$}$$

Question 4

Which of the following is the correct empirical formula for a compound containing 40.0% magnesium and 60.0% oxygen by mass?

Accepted Answer

$$\mathrm{MgO}$$

Question 5

Which molecule has a linear molecular geometry and a bond angle of $$180^\circ$$?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 6

A reaction between 10.0 g of $$\mathrm{Al}$$ and 35.0 g of $$\mathrm{Cl_2$}$$ produces $$\mathrm{$$AlCl_3$$}$$ according to the equation: $$2\mathrm{Al} + 3\mathrm{Cl_2$} \rightarrow 2\mathrm{$$AlCl_3$$}. $$What is the limiting reactant?

Accepted Answer

$$\mathrm{Cl_2$}$$

Question 7

Which of the following ions forms a compound that is generally insoluble in water, except when paired with $$\mathrm{Na^+}$$, $$\mathrm{K^+}$$, or $$\mathrm{NH_4$^+}$$?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 8

Which of the following best describes a metathesis (double displacement) reaction?

Accepted Answer

A reaction in which two compounds exchange ions to form two new compounds

Question 9

What is the molecular geometry of $$\mathrm{SF_4$}$$?

Accepted Answer

Seesaw

Question 10

A solution contains $$\mathrm{Ag^+}$$ and $$\mathrm{Cl^-}$$ ions. What will happen when these ions are mixed in water?

Accepted Answer

$$\mathrm{AgCl}$$ will precipitate

Question 11

Which of the following statements about limiting reactants is correct?

Accepted Answer

The limiting reactant is completely consumed first in a chemical reaction

Question 12

Which of the following compounds is always soluble in water?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 13

What is the percent yield if 12.0 g of $$\mathrm{$$CuSO_4$$} is $$produced, but the theoretical yield is 15.0 g?

Accepted Answer

$$80.0\%$$

Question 14

Which of the following best describes the Lewis structure of $$\mathrm{CO_2$}$$?

Accepted Answer

Central carbon atom with two double bonds to oxygen atoms

Question 15

Which of the following is the correct formula for a compound formed between $$\mathrm{Al$$^{3+}$$}$$ and $$\mathrm{SO_4$^{2-}}$$?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 16

Which of the following is NOT a step in drawing a Lewis structure for a molecule?

Accepted Answer

Ignore the octet rule for second-period elements

Question 17

A student is asked to write the net ionic equation for the reaction between $$\mathrm{Na_2CO_3}$$ and $$\mathrm{$$CaCl_2$$} in $$water. Which of the following is the correct net ionic equation?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$} + \mathrm{CO_3$^{2-}} \rightarrow \mathrm{$$CaCO_3$$(s)}$$

Question 18

Which of the following best explains why $$\mathrm{H_2O}$$ has a bent molecular geometry?

Accepted Answer

The oxygen atom has two lone pairs, causing repulsion and bending the molecule

Question 19

Which of the following is the correct electron geometry for $$\mathrm{$$PCl_5$$}$$?

Accepted Answer

Trigonal bipyramidal

General Chemistry II: Exam #2 Study Guide – CHEM116

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