Question 1

How many of the following compounds are soluble in water? Cu(OH)₂ LiNO₃ NH₄Br K₂S

Accepted Answer

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Question 2

How many of the following compounds are insoluble in water? KC₂H₃O₂CaSO₄ SrS AlPO₄

Accepted Answer

To determine solubility, we need to consider the solubility rules. Based on the rules, we can see that KCS1U1B12S1U1B0HS1U1B13S1U1B0OS1U1B12 would be soluble since all potassium (K+) compounds are soluble, as well as sulfides (S2-), hydroxides (OH-), and most sulfates (SO42-). CaSO4 is insoluble because all sulfates (SO42-) except for those of alkali metals and ammonium (NH4+) are insoluble. SrS would be insoluble because all sulfides (S2-) except for those of alkali metals and ammonium (NH4+) are insoluble. AlPO4 would be insoluble because all phosphates (PO43-) except for those of alkali metals and ammonium (NH4+) are insoluble. Therefore, only CaSO4 and SrS are insoluble in water, giving us a total of 2 compounds.

Question 3

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of K₂S and Fe(NO₃)₂ are mixed.

Accepted Answer

The net ionic equation is Fe(SO4)2(aq) + H2S(aq) → FeS(s) + 2H+(aq) + 2SO4 2-(aq) since K₂S and Fe(NO₃)₂ do not react with each other. The balanced equation is: K2S(aq) + FeSO4(aq) → FeS(s) + K2SO4(aq)

Question 4

Identify the complete ionic equation for the reaction (if any)that occurs when aqueous solutions of MgSO₃ and HI are mixed.

Accepted Answer

When MgSO₃ and HI are mixed, the H⁺ ions from HI react with SO₃²⁻ ions to form H₂O and SO₂ gas, which is represented by option D.

Question 5

Which of the following is a precipitation reaction?

Accepted Answer

A precipitation reaction is when two aqueous solutions react to form a solid product, which then precipitates out of the solution. In choice C, 2LiI(aq) and HgS produce a solid product, HgI2, which precipitates out of the solution. Therefore, choice C is the only precipitation reaction. Choices A, B, D, and E do not involve the formation of a solid product.

Question 6

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Accepted Answer

This is a double displacement reaction, where the cations and anions of the two aqueous solutions switch partners. If one of the new pairs that forms is insoluble, a precipitate will form. In choice C, Sr2+ will pair with SO42- to form an insoluble precipitate, strontium sulfate (SrSO4). None of the other choices will form an insoluble precipitate.

Question 7

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Accepted Answer

When aqueous solutions of Hg(NO3)2 and LiI are mixed, a yellow precipitate of HgI2 will form. This is because HgI2 is insoluble in water while the remaining products (LiNO3) will remain in solution. In option A, both products are soluble in water and will not form a precipitate. In option C, NaCl and Li3PO4 will not form a precipitate as both are soluble in water. In option D, AgCl will form a white precipitate, but Cu(NO3)2 will remain in solution. Therefore, the correct answer is B.

Question 8

Which of the following compounds is insoluble in water?

Accepted Answer

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Question 9

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of Na₂CO₃ and HCl are mixed.

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Question 10

Identify the spectator ions in the following molecular equation: KBr(aq)+ AgNO₃(aq)→ AgBr(s)+ KNO₃(aq)

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Question 11

What precipitate is most likely formed from a solution containing Ba⁺², Na⁺¹, OH^-1, and CO₃^-2.

Accepted Answer

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Question 12

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of H₂SO₄ and KOH are mixed.

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Question 13

An acid solution is 0.100 mol L^-1 in HCl and 0.200 mol L^-1 H₂SO₄. What volume of a 0.150 mol L^-1 KOH solution would completely neutralize 500.0 mL of this solution?

Accepted Answer

Step 1: Write the balanced chemical equation for the neutralization reaction: HCl + KOH → KCl + H2O Step 2: Determine the number of moles of HCl present in the solution: 0.100 mol/L x 0.500 L = 0.050 mol HCl Step 3: Determine the number of moles of H₂SO₄ present in the solution: 0.200 mol/L x 0.500 L = 0.100 mol H₂SO₄ Step 4: Determine the total number of moles of acid present in the solution: 0.050 mol + 0.100 mol = 0.150 mol Step 5: Use the mole ratio from the balanced equation to determine the number of moles of KOH needed to neutralize the acid: 1 mol HCl : 1 mol KOH 0.150 mol HCl : x mol KOH x = 0.150 mol KOH Step 6: Use the concentration and volume of the KOH solution to determine the volume needed to supply the required number of moles: 0.150 mol/L x V = 0.150 mol V = 1.00 L However, this is the volume needed to completely neutralize 1.00 L of the acid solution. Since we are starting with only 500 mL (0.500 L) of the acid solution, we need half the volume of the KOH solution: V = 0.500 L x 1.00 L/0.150 mol = 3.33 L V = 3.33 L / 2 = 1.67 L Therefore, the best choice is C.

Question 14

Which of the following is an acid-base reaction?

Accepted Answer

In option B, HCl (hydrochloric acid) reacts with Ca(OH)2 (calcium hydroxide) to form water and CaCl2 (calcium chloride). This is a classic acid-base neutralization reaction. The other options involve either synthesis or decomposition reactions, but not acid-base reactions.

Question 15

Identify the complete ionic equation for the reaction (if any)that occurs when aqueous solutions of lithium sulfide and copper(II)nitrate are mixed.

Accepted Answer

The correct formula for lithium sulfide is Li2S, not LiS. Therefore, the equation must be balanced with this in mind. The correct ionic equation is:
2Li2S (aq) + Cu(NO3)2 (aq) → CuS (s) + 4LiNO3 (aq)
This shows that the lithium ions (Li+) and the nitrate ions (NO3-) do not participate in the reaction and are simply spectator ions. The only ions that actually react are the sulfide ions (S2-) and the copper(II) ions (Cu2+), which combine to form solid copper sulfide (CuS).

Question 16

Identify the polyprotic acid.

Accepted Answer

The formula for the acid specified in choice A contains multiple hydrogen ions that can be ionized sequentially, making it a polyprotic acid.

Question 17

Which of the following compounds is soluble in water?

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Question 18

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Accepted Answer

When magnesium chloride (MgCl2) and potassium hydroxide (KOH) are mixed, they will form a precipitate of magnesium hydroxide (Mg(OH)2). The other options do not form precipitates. HCl and LiOH will form water and a salt, LiCl. Li2S12O12 and HCl will form hydrogen sulfide gas and LiCl. K2CO3 and HNO3 will form water, carbon dioxide gas, and potassium nitrate.

Question 19

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Accepted Answer

When solutions of CaS and Na2SO4 are mixed, they will undergo a double displacement reaction to form CaSO4, which is insoluble and will precipitate out of solution. None of the other solution pairs will produce a precipitate.

Question 20

Which of the following is a precipitation reaction?

Accepted Answer

A precipitation reaction occurs when two aqueous solutions combine to form an insoluble solid, called a precipitate. In option E, CrCO₃(s) is the precipitate formed from the reaction of CrBr₂(aq) and Na₂CO₃(aq).

Quiz 4: Chemical Reactions and Stoichiometry

How many of the following compounds are soluble in water? Cu(OH) ₂ LiNO₃ NH₄Br K₂S

How many of the following compounds are insoluble in water? KC₂H₃O₂CaSO₄ SrS AlPO₄

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K₂S and Fe(NO₃) ₂ are mixed.

Identify the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO₃ and HI are mixed.

Which of the following is a precipitation reaction?

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Which of the following compounds is insoluble in water?

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na₂CO₃ and HCl are mixed.

Identify the spectator ions in the following molecular equation: KBr(aq) + AgNO₃(aq) → AgBr(s) + KNO₃(aq)

What precipitate is most likely formed from a solution containing Ba⁺², Na⁺¹, OH^-1, and CO₃^-2.

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of H₂SO₄ and KOH are mixed.

An acid solution is 0.100 mol L^-1 in HCl and 0.200 mol L^-1 H₂SO₄. What volume of a 0.150 mol L^-1 KOH solution would completely neutralize 500.0 mL of this solution?

Which of the following is an acid-base reaction?

Identify the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of lithium sulfide and copper(II) nitrate are mixed.

Identify the polyprotic acid.

Which of the following compounds is soluble in water?

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Which of the following is a precipitation reaction?

Quiz 4: Chemical Reactions and Stoichiometry

How many of the following compounds are soluble in water? Cu(OH) 2 LiNO3 NH4Br K2S

How many of the following compounds are insoluble in water? KC2H3O2 CaSO4 SrS AlPO4

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K2S and Fe(NO3) 2 are mixed.

Identify the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO3 and HI are mixed.

Which of the following is a precipitation reaction?

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Which of the following compounds is insoluble in water?

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na2CO3 and HCl are mixed.

Identify the spectator ions in the following molecular equation: KBr(aq) + AgNO3(aq) → AgBr(s) + KNO3(aq)

What precipitate is most likely formed from a solution containing Ba+2, Na+1, OH-1, and CO3-2.

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of H2SO4 and KOH are mixed.

An acid solution is 0.100 mol L-1 in HCl and 0.200 mol L-1 H2SO4. What volume of a 0.150 mol L-1 KOH solution would completely neutralize 500.0 mL of this solution?

Which of the following is an acid-base reaction?

Identify the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of lithium sulfide and copper(II) nitrate are mixed.

Identify the polyprotic acid.

Which of the following compounds is soluble in water?

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Which of the following pairs of aqueous solutions will form a precipitate when mixed?

Which of the following is a precipitation reaction?

How many of the following compounds are soluble in water? Cu(OH) ₂ LiNO₃ NH₄Br K₂S

How many of the following compounds are insoluble in water? KC₂H₃O₂CaSO₄ SrS AlPO₄

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K₂S and Fe(NO₃) ₂ are mixed.

Identify the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO₃ and HI are mixed.

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na₂CO₃ and HCl are mixed.

Identify the spectator ions in the following molecular equation: KBr(aq) + AgNO₃(aq) → AgBr(s) + KNO₃(aq)

What precipitate is most likely formed from a solution containing Ba⁺², Na⁺¹, OH^-1, and CO₃^-2.

Identify the net ionic equation for the reaction (if any) that occurs when aqueous solutions of H₂SO₄ and KOH are mixed.

An acid solution is 0.100 mol L^-1 in HCl and 0.200 mol L^-1 H₂SO₄. What volume of a 0.150 mol L^-1 KOH solution would completely neutralize 500.0 mL of this solution?