Unit 7 Review

Which formula or formulas in the table below will require a roman numeral in its written name?

• Sn(NO₂)₂

• AlF₃ and

  CaCO₃

• Sn(NO₂)₂ and FePO₄

• AlF₃

Which of the following models of a chemical reaction BEST represents the law of conservation of mass?

• Reaction I

• Reaction II

• Reaction III

• Reaction IV

When potassium hydroxide and barium chloride react, potassium chloride and barium hydroxide are formed. Which of the following best represents the balanced chemical equation for this reaction?

• KH + BaCl → KCl + BaH

• KOH + BaCl → KCl + BaOH

• 2KOH + BaCl₂ → 2KCl + Ba(OH)₂

• KOH + BaCl₂ → 2KCl + Ba(OH)₂

Which of the following statements about naming compounds is correct?

• Ionic compounds require prefixes to determine the number of each ion present because there is only one

  fixed ratio in which ionic compounds can form

• Polyatomic ions use roman numerals to communicate the value of the charge due to having multiple

  atoms

• Covalent compounds will use roman numerals only if a transition metal is in the covalent compound

• Covalent compounds require prefixes because electrons can be shared in single, double, or triple bonds

  and therefore can the elements can be combined in multiple ways

What is the formula for disulfur decafluoride?

• S₁₀F₂

• S₃F₉

• S₂F₁₀

• S₂F₈

Strips of Metal Y are added to solutions of zinc nitrate, copper (II) nitrate, and lead (II) nitrate. The strip reacts with zinc, copper, and lead. According to the results of the experiments, which must be true?

• Zn is more active than Y

• Cu is more active than Y

• Pb is more active than Y

• Y is the most active metal shown

In any oxidation-reduction (redox) reaction, the total number of electrons gained is…

• equal to the total number of electrons lost

• less than the total number of electrons lost

• greater than the total number of electrons lost

• unrelated to the total number of electrons lost

Which of the following is a redox reaction?

• 2 HCl + Mg(OH)₂ → 2 H₂O + MgCl₂

• 2 NaCl + H₂SO₄ → Na₂SO₄ + 2 HCl

• HCl + NaOH → H₂O + NaCl

• 2 AlPO₄ + 3 Mg → 2 Al + Mg₃(PO₄)₂

Which of the following shows the correctly balanced net ionic equation for precipitation of CaCO₃ when aqueous solutions of Na₂CO₃ and CaCl₂ are mixed?

• 2 Na⁺(aq) + CO₃^2-(aq) → Na₂CO₃ (aq)

• Ca²⁺ (aq) + CO₃^2-(aq) → CaCO₃ (s)

• Na⁺ (aq) + Cl^- (aq) → NaCl (aq)

• Na₂CO₃ (aq) + CaCl₂ (aq) → 2 NaCl (aq) + CaCO₃ (s)

Which of the following substances COULD NOT be a precipitate formed during a reaction between two aqueous solutions?

• Lead (II) Sulfate

• Silver Bromide

• Rubidium Hydroxide

• Barium Phosphate