Question 1

Which one of the following equations is properly balanced?

Accepted Answer

A

Question 2

Which of the following equations is $\underline{\text{ not  }}$ balanced?

Accepted Answer

E

Question 3

The reaction of elemental chlorine with potassium iodide yields elemental iodine and potassium chloride.Write a balanced chemical equation for this reaction.

Accepted Answer

The balanced equation is: Cl2 + 2KI -> 2KCl + I2. This equation shows that two moles of KI are required to react with one mole of Cl2, producing two moles of KCl and one mole of I2. Therefore, option B is the correct choice as it matches with the balanced chemical equation.

Question 4

What is the smallest whole number coefficient for sodium hydroxide when the following equation is balanced? __Na₂SO₄ + __Al(OH)₃ $\to$__Al₂(SO₄)₃ + __NaOH

Accepted Answer

The balanced equation is: 3Na2SO4 + 2Al(OH)3 → Al2(SO4)3 + 6NaOH. The smallest whole number coefficient for NaOH is 6.

Question 5

Which of the following statements is/are CORRECT?
1)Most ionic compounds containing phosphate ion are insoluble in water.
2)Most ionic compounds containing potassium ion are insoluble in water.
3)Most ionic compounds containing hydroxide ion are soluble in water.

Accepted Answer

Most ionic compounds containing phosphate ions are generally insoluble in water, while those containing potassium ions are typically soluble. Hydroxide compounds are often insoluble, except for those with alkali metals and some alkaline earth metals.

Question 6

The complete combustion of nonane,C₉H₂₀,yields carbon dioxide and water: The $\underline{\text{ smallest whole-number }}$ coefficient of $\underline{\text{ oxygen }}$ in the balanced equation is

Accepted Answer

The balanced equation for the combustion of nonane is:
C9H20 + 14O2 → 9CO2 + 10H2O
The coefficient of oxygen is 14, which is already a whole number. Therefore, the smallest whole-number coefficient of oxygen in the balanced equation is 14, which corresponds to choice B.

Question 7

A precipitate is expected when an aqueous solution of potassium iodide is added to an aqueous solution of

Accepted Answer

Lead iodide (PbI2) is insoluble in water and will form a precipitate when potassium iodide is added to lead perchlorate solution.

Question 8

Which of the following compounds is $\underline{\text{soluble    }}$ in water?

Accepted Answer

Cs₃N is soluble in water because cesium compounds, especially those with alkali metals, are generally soluble in water.

Question 9

Nitroglycerin decomposes violently according to the balanced chemical equation below.2 C₃H₅(NO₃)₃( )$\to$ 3 N₂(g)+ 1/2 O₂(g)+ 6 CO₂(g)+ 5 H₂O(g) Which of the following statements concerning this reaction is/are CORRECT? 1)Two moles of nitroglycerine will produce three moles of nitrogen and five moles of water. 2)Four molecules of nitroglycerine will produced one molecule of oxygen and twelve molecules of carbon dioxide. 3)Six grams of nitroglycerine will produce nine grams of nitrogen and fifteen grams of water.

Accepted Answer

The answer of Nitroglycerin decomposes violently according to the balanced...

Question 10

Which one of the statements below is $\textbf{ false }$ concerning the following reaction: NH₃(g)+ H₂O $\to$ NH₄⁺(aq)+ OH^-(aq)

Accepted Answer

The answer of Which one of the statements below is...

Question 11

Metals react with oxygen gas to produce oxides with the general formula M_xO_y.Write a balanced chemical equation for the reaction of titanium with oxygen to yield titanium(IV)oxide.

Accepted Answer

The balanced chemical equation for the reaction is Ti(s) + 2O2(g) -> TiO2(s). Using the given formula, we can write Ti as M_xO_y, where M is the metal, S is sulphur, B is a non-metal, and (x+y) represents the valency of the metal. Oxygen is represented by O₂. Substituting in the values, we get Ti(s) + O₂(g) -> TiO₂(s), which is equivalent to choice B.

Question 12

Which of the following statements is/are CORRECT?
1)Water soluble ionic compounds,such as NaCl,are strong electrolytes.
2)Some molecular compounds,such as HCl,are strong electrolytes.
3)Some molecular compounds,such as acetic acid,are weak electrolytes.

Accepted Answer

All three statements are correct: 1) Ionic compounds like NaCl dissociate completely in water, making them strong electrolytes. 2) Molecular compounds like HCl ionize completely in water, also making them strong electrolytes. 3) Acetic acid partially ionizes in water, making it a weak electrolyte.

Question 13

Which of the following statements concerning electrolytes and nonelectrolytes is/are true?
1)Some molecular substances are electrolytes.
2)All electrolytes are ionic substances.
3)Strong electrolytes partially ionize in solution.

Accepted Answer

Statement 1 is true because some molecular substances, such as acids and bases, can ionize in water to form ions and conduct electricity.

Statement 2 is not true because there are some covalent compounds that can ionize in water and conduct electricity, such as acids.

Statement 3 is not true because strong electrolytes fully ionize in solution, while weak electrolytes only partially ionize.

Question 14

What is the balanced chemical equation for the complete combustion of benzoic acid,C₆H₅CO₂H,to form carbon dioxide and water?

Accepted Answer

The balanced chemical equation for the complete combustion of benzoic acid is: 2 C₆H₅CO₂H(s) + 15 O₂(g) → 14 CO₂(g) + 6 H₂O(g). This equation balances the number of carbon, hydrogen, and oxygen atoms on both sides.

Question 15

Which of the following statements is/are CORRECT?
1)A solution is a homogeneous mixture of two or more substances.
2)A solute is a mixture of a solvent and a soluble compound.
3)Aqueous solutions are solutions in which water is a solvent.

Accepted Answer

1) This statement is correct as a solution is defined as a homogeneous mixture of two or more substances. This means that the components of a solution are uniformly distributed throughout the mixture and there is no visible difference between them.

2) This statement is incorrect. A solute is a substance that is dissolved in a solvent to form a solution. It is not a mixture itself, but rather a component of a mixture.

3) This statement is correct. Aqueous solutions are solutions in which water is the solvent. This means that the solute is dissolved in water to form a homogeneous mixture. Common examples of aqueous solutions include saltwater and sugar water.

Question 16

What are the smallest whole number coefficients the reactants and products when the following molecular equation is correctly balanced? __NH₃(g)+__O₂(g)$\to$ __NO(g)+ __H₂O(g)

Accepted Answer

The answer of What are the smallest whole number coefficients...

Question 17

Which one of the following compounds is a nonelectrolyte when dissolved in water?

Accepted Answer

CCl4 (carbon tetrachloride) is a covalent compound and does not dissociate into ions when dissolved in water, making it a nonelectrolyte. HCl, CaCl2, Cu(NO3)2, and NaCHO2 all dissociate into ions when dissolved in water, making them electrolytes.

Question 18

The products of the complete combustion of octane,C₈H₁₈,are carbon dioxide and water.Write a balanced chemical equation for this reaction.

Accepted Answer

The balanced chemical equation for the combustion of octane is: 
2 C8H18 + 25 O2 -> 16 CO2 + 18H2O
This equation shows that 2 moles of octane react with 25 moles of oxygen to produce 16 moles of carbon dioxide and 18 moles of water. Therefore, answer choice C is the correct balanced chemical equation for this reaction.

Question 19

The balanced chemical equation for the combustion of methane is: CH₄(g)+ 2 O₂(g)$\to$CO₂(g)+ 2 H₂O(g) Which of the following statements concerning this chemical equation is/are correct? 1)One gram of methane gas reacts with two grams of dioxygen gas,producing one gram of carbon dioxide gas and two grams of gaseous water. 2)One mole of methane gas reacts with two moles of dioxygen gas,producing one mole of carbon dioxide gas and two moles of gaseous water. 3)One molecule of methane gas reacts with two molecules of dioxygen gas,producing one molecule of carbon dioxide gas and two molecules of gaseous water.

Accepted Answer

The balanced chemical equation is based on moles and molecules, not grams. Statement 2 correctly describes the reaction in terms of moles, and statement 3 correctly describes it in terms of molecules.

Question 20

Which of the following statements is/are CORRECT?
1)Most ionic compounds containing nitrate ion are soluble in water.
2)Most ionic compounds containing sulfate ion are insoluble in water.
3)Most ionic compounds containing carbonate ion are soluble in water.

Accepted Answer

1) Most ionic compounds containing nitrate ion are soluble in water. This is because nitrate ion is a small and highly hydrated ion, which means it can easily dissolve in water.
2) Most ionic compounds containing sulfate ion are insoluble in water. This is because sulfate ion is a large ion and its hydration energy is not sufficient to overcome its lattice energy, therefore it stays insoluble in water.
3) Most ionic compounds containing carbonate ion are insoluble in water. This is because carbonate ion results in the formation of insoluble salts of carbonates when reacted with most of the metal ions present in solutions.

Quiz 4: Chemical Reactions

Which one of the following equations is properly balanced?

Which of the following equations is $\underline{\text{ not }}$ balanced?

The reaction of elemental chlorine with potassium iodide yields elemental iodine and potassium chloride.Write a balanced chemical equation for this reaction.

What is the smallest whole number coefficient for sodium hydroxide when the following equation is balanced? Na₂SO₄ + Al(OH) ₃ $\to$ Al₂(SO₄) ₃ + NaOH

Which of the following statements is/are CORRECT? 1) Most ionic compounds containing phosphate ion are insoluble in water. 2) Most ionic compounds containing potassium ion are insoluble in water. 3) Most ionic compounds containing hydroxide ion are soluble in water.

A precipitate is expected when an aqueous solution of potassium iodide is added to an aqueous solution of

Which of the following compounds is $\underline{\text{soluble }}$ in water?

Metals react with oxygen gas to produce oxides with the general formula M_xO_y.Write a balanced chemical equation for the reaction of titanium with oxygen to yield titanium(IV) oxide.

Which of the following statements is/are CORRECT? 1) Water soluble ionic compounds,such as NaCl,are strong electrolytes. 2) Some molecular compounds,such as HCl,are strong electrolytes. 3) Some molecular compounds,such as acetic acid,are weak electrolytes.

Which of the following statements concerning electrolytes and nonelectrolytes is/are true? 1) Some molecular substances are electrolytes. 2) All electrolytes are ionic substances. 3) Strong electrolytes partially ionize in solution.

What is the balanced chemical equation for the complete combustion of benzoic acid,C₆H₅CO₂H,to form carbon dioxide and water?

Which of the following statements is/are CORRECT? 1) A solution is a homogeneous mixture of two or more substances. 2) A solute is a mixture of a solvent and a soluble compound. 3) Aqueous solutions are solutions in which water is a solvent.

What are the smallest whole number coefficients the reactants and products when the following molecular equation is correctly balanced? NH₃(g) +O₂(g) $\to$ NO(g) + H₂O(g)

Which one of the following compounds is a nonelectrolyte when dissolved in water?

The products of the complete combustion of octane,C₈H₁₈,are carbon dioxide and water.Write a balanced chemical equation for this reaction.

Which of the following statements is/are CORRECT? 1) Most ionic compounds containing nitrate ion are soluble in water. 2) Most ionic compounds containing sulfate ion are insoluble in water. 3) Most ionic compounds containing carbonate ion are soluble in water.

Quiz 4: Chemical Reactions

Which one of the following equations is properly balanced?

Which of the following equations is not ‾\underline{\text{ not }} not ​ balanced?

The reaction of elemental chlorine with potassium iodide yields elemental iodine and potassium chloride.Write a balanced chemical equation for this reaction.

What is the smallest whole number coefficient for sodium hydroxide when the following equation is balanced? __Na2SO4 + __Al(OH) 3 →\to→ __Al2(SO4) 3 + __NaOH

Which of the following statements is/are CORRECT? 1) Most ionic compounds containing phosphate ion are insoluble in water. 2) Most ionic compounds containing potassium ion are insoluble in water. 3) Most ionic compounds containing hydroxide ion are soluble in water.

The complete combustion of nonane,C9H20,yields carbon dioxide and water: The smallest whole-number ‾\underline{\text{ smallest whole-number }} smallest whole-number ​ coefficient of oxygen ‾\underline{\text{ oxygen }} oxygen ​ in the balanced equation is

A precipitate is expected when an aqueous solution of potassium iodide is added to an aqueous solution of

Which of the following compounds is soluble ‾\underline{\text{soluble }}soluble ​ in water?

Which one of the statements below is false \textbf{ false } false concerning the following reaction: NH3(g) + H2O →\to→ NH4+(aq) + OH-(aq)

Metals react with oxygen gas to produce oxides with the general formula MxOy.Write a balanced chemical equation for the reaction of titanium with oxygen to yield titanium(IV) oxide.

Which of the following statements is/are CORRECT? 1) Water soluble ionic compounds,such as NaCl,are strong electrolytes. 2) Some molecular compounds,such as HCl,are strong electrolytes. 3) Some molecular compounds,such as acetic acid,are weak electrolytes.

Which of the following statements concerning electrolytes and nonelectrolytes is/are true? 1) Some molecular substances are electrolytes. 2) All electrolytes are ionic substances. 3) Strong electrolytes partially ionize in solution.

What is the balanced chemical equation for the complete combustion of benzoic acid,C6H5CO2H,to form carbon dioxide and water?

Which of the following statements is/are CORRECT? 1) A solution is a homogeneous mixture of two or more substances. 2) A solute is a mixture of a solvent and a soluble compound. 3) Aqueous solutions are solutions in which water is a solvent.

What are the smallest whole number coefficients the reactants and products when the following molecular equation is correctly balanced? __NH3(g) +__O2(g) →\to→ __NO(g) + __H2O(g)

Which one of the following compounds is a nonelectrolyte when dissolved in water?

The products of the complete combustion of octane,C8H18,are carbon dioxide and water.Write a balanced chemical equation for this reaction.

Which of the following statements is/are CORRECT? 1) Most ionic compounds containing nitrate ion are soluble in water. 2) Most ionic compounds containing sulfate ion are insoluble in water. 3) Most ionic compounds containing carbonate ion are soluble in water.

Which of the following equations is $\underline{\text{ not }}$ balanced?

What is the smallest whole number coefficient for sodium hydroxide when the following equation is balanced? Na₂SO₄ + Al(OH) ₃ $\to$ Al₂(SO₄) ₃ + NaOH

Which of the following compounds is $\underline{\text{soluble }}$ in water?

Metals react with oxygen gas to produce oxides with the general formula M_xO_y.Write a balanced chemical equation for the reaction of titanium with oxygen to yield titanium(IV) oxide.

What is the balanced chemical equation for the complete combustion of benzoic acid,C₆H₅CO₂H,to form carbon dioxide and water?

What are the smallest whole number coefficients the reactants and products when the following molecular equation is correctly balanced? NH₃(g) +O₂(g) $\to$ NO(g) + H₂O(g)

The products of the complete combustion of octane,C₈H₁₈,are carbon dioxide and water.Write a balanced chemical equation for this reaction.