A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of:Group of answer choicesSodium chloridemagnesium chloridepotassium chloridebarium chlorideiron(III) chloride Flag question: Question 18Question 18Tips2.5 pts       18- How many moles of NH3 are needed to react completely with 13.6 mol of F2, as shown below?2NH3 +5F2------N2F4 +6HFGroup of answer choices2.27 mol6.80 molnone of the above34 mol5.44 mol Flag question: Question 19Question 19Tips2.5 pts     19.   Which of the following equations is a decomposition reaction?        Group of answer choices2Li (s)  +  2H2O (l)   ----- 2LiOH (aq)   +    H2 (g)Ca (s)   +   2HNO3 (aq) -----Ca(NO3)2 (s)   +   H2 (g)none of the above2KClO3 (s)  ----     2KCl (s)  + 3O2(g)Na2SO3 (s)   +  2HCl (aq) ----   SO2(g)   + H2O (l)   Flag question: Question 20Question 20Tips2.5 pts     20-    Which of the following equations using the single displacement  mechanism actually happened in lab?   Group of answer choices    Group of answer choicesZn (s)  +  MgSO4 (aq)  ----  ZnSO4(aq)   +   MgNone of the aboveCu (s) + AgNO3 (aq) ------Cu(NO3)2(aq) + Ag (s)CaCl2 (aq) + Na2CO3(aq) -----CaCO3 (s) + 2NaCl (aq)2H2 (g) + O2 (g) -----2H2ONo new data to save. Last checked at 6:03pm Submit QuizQuestionsAnsweredQuestion 1AnsweredQuestion 2AnsweredQuestion 3AnsweredQuestion 4AnsweredQuestion 5AnsweredQuestion 6AnsweredQuestion 7Haven't Answered YetQuestion 8AnsweredQuestion 9AnsweredQuestion 10AnsweredQuestion 11AnsweredQuestion 12AnsweredQuestion 13AnsweredQuestion 14AnsweredQuestion 15AnsweredQuestion 16Haven't Answered YetQuestion 17Haven't Answered YetQuestion 18Haven't Answered YetQuestion 19Haven't Answered YetQuestion 20Time Running:Hide Time1 Hour, 26 Minutes, 19 Seconds

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Question 17: A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of:

• Sodium chloride
• Magnesium chloride
• Potassium chloride
• Barium chloride
• Iron(III) chloride

Step-by-Step Solution:

1. Identify the ions in sodium sulfate (Na₂SO₄): Na⁺ and SO₄²⁻.
2. Consider the possible reactions with the given chlorides:
   • Sodium chloride (NaCl): Na⁺ and Cl⁻
   • Magnesium chloride (MgCl₂): Mg²⁺ and Cl⁻
   • Potassium chloride (KCl): K⁺ and Cl⁻
   • Barium chloride (BaCl₂): Ba²⁺ and Cl⁻
   • Iron(III) chloride (FeCl₃): Fe³⁺ and Cl⁻
3. Determine if any of these combinations form an insoluble compound with SO₄²⁻.
4. Barium sulfate (BaSO₄) is known to be insoluble in water.

Answer:

• Barium chloride

Question 18: How many moles of NH₃ are needed to react completely with 13.6 mol of F₂, as shown below? 2NH₃ + 5F₂ → N₂F₄ + 6HF

Step-by-Step Solution:

1. Write the balanced equation: 2NH₃ + 5F₂ → N₂F₄ + 6HF.
2. Determine the mole ratio between NH₃ and F₂ from the balanced equation: 2 moles of NH₃ react with 5 moles of F₂.
3. Use the mole ratio to find the moles of NH₃ needed for 13.6 moles of F₂: $\text{Moles of NH₃} = \left(\frac{2 \text{ moles NH₃}}{5 \text{ moles F₂}}\right) \times 13.6 \text{ moles F₂} = 5.44 \text{ moles NH₃}$

Answer:

• 5.44 mol

Question 19: Which of the following equations is a decomposition reaction?

• 2Li (s) + 2H₂O (l) → 2LiOH (aq) + H₂ (g)
• Ca (s) + 2HNO₃ (aq) → Ca(NO₃)₂ (s) + H₂ (g)
• None of the above
• 2KClO₃ (s) → 2KCl (s) + 3O₂ (g)
• Na₂SO₃ (s) + 2HCl (aq) → SO₂ (g) + H₂O (l)

Step-by-Step Solution:

1. Identify the type of reaction for each equation:
   • 2Li (s) + 2H₂O (l) → 2LiOH (aq) + H₂ (g): Single displacement reaction.
   • Ca (s) + 2HNO₃ (aq) → Ca(NO₃)₂ (s) + H₂ (g): Single displacement reaction.
   • 2KClO₃ (s) → 2KCl (s) + 3O₂ (g): Decomposition reaction.
   • Na₂SO₃ (s) + 2HCl (aq) → SO₂ (g) + H₂O (l): Double displacement reaction.

Answer:

• 2KClO₃ (s) → 2KCl (s) + 3O₂ (g)

Question 20: Which of the following equations using the single displacement mechanism actually happened in lab?

• Zn (s) + MgSO₄ (aq) → ZnSO₄ (aq) + Mg
• None of the above
• Cu (s) + AgNO₃ (aq) → Cu(NO₃)₂ (aq) + Ag (s)
• CaCl₂ (aq) + Na₂CO₃ (aq) → CaCO₃ (s) + 2NaCl (aq)
• 2H₂ (g) + O₂ (g) → 2H₂O

Step-by-Step Solution:

1. Identify the type of reaction for each equation:
   • Zn (s) + MgSO₄ (aq) → ZnSO₄ (aq) + Mg: Single displacement reaction, but Zn is less reactive than Mg, so it does not occur.
   • Cu (s) + AgNO₃ (aq) → Cu(NO₃)₂ (aq) + Ag (s): Single displacement reaction, and Cu is more reactive than Ag, so it occurs.
   • CaCl₂ (aq) + Na₂CO₃ (aq) → CaCO₃ (s) + 2NaCl (aq): Double displacement reaction.
   • 2H₂ (g) + O₂ (g) → 2H₂O: Combination reaction.

Answer:

• Cu (s) + AgNO₃ (aq) → Cu(NO₃)₂ (aq) + Ag (s)