Question 1

What are the coefficients for the following reaction when it is properly balanced?
___nitrogen monoxide + ___carbon monoxide → ___nitrogen +___carbon dioxide

Accepted Answer

The balanced equation for the reaction is: 
2NO + 2CO → 2N + 2CO2. 
Therefore, the coefficients are 
2, 2, 2, and 2. 
Choice B has the correct coefficients for the balanced equation.

Question 2

Which of the following is NOT typically a sign of a chemical reaction?

Accepted Answer

Absorbing light is not typically a sign of a chemical reaction. The other options, such as emission of heat, absorption of heat, and emission of light, are common signs of a chemical reaction.

Question 3

A reaction in which a substance reacts with oxygen,emitting heat and forming oxygen-containing compounds is an example of a(n):

Accepted Answer

A reaction in which a substance reacts with oxygen, emitting heat and forming oxygen-containing compounds is known as a combustion reaction.

Question 4

It has been shown that the ozone molecule (O₃)can be formed when a single oxygen atom (O)adds to a molecule of oxygen (O₂),so this type of reaction is known as a double displacement reaction.

Accepted Answer

The reaction described is not a double displacement reaction, but rather an example of a combination reaction.

Question 5

Before a chemical equation can be written,one must know:

Accepted Answer

In order to write a chemical equation, one must know the symbols and formulas of all reactants and products involved. The other options listed may be helpful in determining the coefficients needed in the equation, but they are not essential for writing the equation itself.

Question 6

Which of the following statements about balancing reactions is FALSE?

Accepted Answer

Adding coefficients does not change the type of compounds involved in the chemical reaction. It only changes the number of each type of molecule present in the reaction.

Question 7

What are the coefficients for the following reaction when it is properly balanced? ___Na₃PO₄ + ___Ba(NO₃)₂→ ___NaNO₃ + ___Ba₃(PO₄)₂

Accepted Answer

The answer of What are the coefficients for the following...

Question 8

A reaction which forms a gaseous product is an example of a(n)________.

Accepted Answer

Gas evolution reactions involve the formation of a gaseous product, while oxidation-reduction reactions involve the transfer of electrons, combustion reactions involve the rapid reaction of a fuel with oxygen to produce heat and light, and precipitation reactions involve the formation of a solid product.

Question 9

A reaction which forms a solid product is an example of a(n):

Accepted Answer

A reaction that forms a solid product is a precipitation reaction, where two aqueous solutions react to form an insoluble solid. Option A, oxidation-reduction reactions, involve the transfer of electrons between species. Option B, combustion reactions, involve a fuel reacting with oxygen to produce energy and products, such as water and carbon dioxide. Option D, gas evolution reactions, involve the formation of a gas as a product. Therefore, the correct answer is option C, precipitation reaction.

Question 10

Which of the following is NOT evidence that a chemical reaction has occurred?

Accepted Answer

All of the given options (A, B, C, and D) are evidence of a chemical reaction.

Question 11

When the equation,___O₂+ ___C₅H₁₂ → ___CO₂ + ___H₂Ois balanced,the coefficient: Of O₂is:

Accepted Answer

The equation can be balanced as follows: 3O₂ + 4C₅H₁₂ → 4CO₂ + 5H₂ + O Therefore, the coefficient of O₂ is 3. Therefore, the answer is D.

Question 12

What are the coefficients for the following reaction when it is properly balanced?
___potassium iodide + ___lead (II)acetate → ___lead (II)iodide +___potassium acetate

Accepted Answer

The balanced chemical equation is 2KI + Pb(C2H3O2)2 → PbI2 + 2KC2H3O2, which means 2 molecules of potassium iodide react with 1 molecule of lead (II) acetate to produce 1 molecule of lead (II) iodide and 2 molecules of potassium acetate.

Question 13

What are the coefficients for the following reaction when it is properly balanced? ___HCl + ___Mg → ___MgCl₂ + ___H₂

Accepted Answer

The answer of What are the coefficients for the following...

Question 14

What are the coefficients for the following reaction when it is properly balanced? ___O₂ + ___CH₄→ ___CO₂ + ___H₂O

Accepted Answer

The answer of What are the coefficients for the following...

Question 15

When the equation __NO₂ + __H₂O + __O₂ → __HNO₃ is balanced,the coefficient of HNO₃ is:

Accepted Answer

To balance the equation, we need 4 molecules of NO₂, 3 molecules of H₂O, and 2 molecules of HNO₃. The coefficient of HNO₃ is 2. Therefore, the answer is choice C.

Question 16

When water is heated,bubbles form in the water.Is this evidence of a chemical reaction? Why?

Accepted Answer

The formation of bubbles in water when heated is a physical change, not a chemical reaction. The bubbles are formed due to the conversion of water into steam, which is a change in state from a liquid to a gas. Therefore, option A is the correct answer.

Question 17

When the equation __Ca₃N₂ + __H₂O → __Ca(OH)₂ + __NH₃ is balanced,the coefficient of H₂O is:

Accepted Answer

The answer of When the equation __Ca₃N₂ + __H₂O →...

Question 18

The reaction 2 KClO₃ → 2 KCl + 3 O₂ would be correctly classified as a decomposition reaction.

Accepted Answer

A decomposition reaction is a reaction in which a single reactant breaks down into two or more simpler products. In this reaction, the reactant KClO3 breaks down into simpler products KCl and O2, making it a decomposition reaction.

Question 19

When the equation,___N₂+ ___H₂ → ___NH₃ is balanced,the coefficient of hydrogen is:

Accepted Answer

The answer of When the equation,___N₂+ ___H₂ → ___NH₃...

Question 20

What are the coefficients for the following reaction when it is properly balanced?
___nitric acid + ___sodium hydroxide → ___sodium nitrate + ___water

Accepted Answer

The answer of What are the coefficients for the following...

Quiz 7: Chemical Reactions

What are the coefficients for the following reaction when it is properly balanced? _nitrogen monoxide + _carbon monoxide → _nitrogen +_carbon dioxide

Which of the following is NOT typically a sign of a chemical reaction?

A reaction in which a substance reacts with oxygen,emitting heat and forming oxygen-containing compounds is an example of a(n) :

It has been shown that the ozone molecule (O₃)can be formed when a single oxygen atom (O)adds to a molecule of oxygen (O₂),so this type of reaction is known as a double displacement reaction.

Before a chemical equation can be written,one must know:

Which of the following statements about balancing reactions is FALSE?

What are the coefficients for the following reaction when it is properly balanced? _Na₃PO₄ + _Ba(NO₃) ₂→ _NaNO₃ + _Ba₃(PO₄) ₂

A reaction which forms a gaseous product is an example of a(n) ________.

A reaction which forms a solid product is an example of a(n) :

Which of the following is NOT evidence that a chemical reaction has occurred?

When the equation,_O₂+ _C₅H₁₂ → _CO₂ + _H₂Ois balanced,the coefficient: Of O₂is:

What are the coefficients for the following reaction when it is properly balanced? _potassium iodide + _lead (II) acetate → _lead (II) iodide +_potassium acetate

What are the coefficients for the following reaction when it is properly balanced? _HCl + _Mg → _MgCl₂ + _H₂

What are the coefficients for the following reaction when it is properly balanced? _O₂ + _CH₄→ _CO₂ + _H₂O

When the equation NO₂ + H₂O + O₂ → HNO₃ is balanced,the coefficient of HNO₃ is:

When water is heated,bubbles form in the water.Is this evidence of a chemical reaction? Why?

When the equation Ca₃N₂ + H₂O → Ca(OH) ₂ + NH₃ is balanced,the coefficient of H₂O is:

The reaction 2 KClO₃ → 2 KCl + 3 O₂ would be correctly classified as a decomposition reaction.

When the equation,_N₂+ _H₂ → ___NH₃ is balanced,the coefficient of hydrogen is:

What are the coefficients for the following reaction when it is properly balanced? _nitric acid + _sodium hydroxide → _sodium nitrate + _water

Quiz 7: Chemical Reactions

What are the coefficients for the following reaction when it is properly balanced? ___nitrogen monoxide + ___carbon monoxide → ___nitrogen +___carbon dioxide

Which of the following is NOT typically a sign of a chemical reaction?

A reaction in which a substance reacts with oxygen,emitting heat and forming oxygen-containing compounds is an example of a(n) :

It has been shown that the ozone molecule (O3)can be formed when a single oxygen atom (O)adds to a molecule of oxygen (O2),so this type of reaction is known as a double displacement reaction.

Before a chemical equation can be written,one must know:

Which of the following statements about balancing reactions is FALSE?

What are the coefficients for the following reaction when it is properly balanced? ___Na3PO4 + ___Ba(NO3) 2 → ___NaNO3 + ___Ba3(PO4) 2

A reaction which forms a gaseous product is an example of a(n) ________.

A reaction which forms a solid product is an example of a(n) :

Which of the following is NOT evidence that a chemical reaction has occurred?

When the equation,___O2 + ___C5H12 → ___CO2 + ___H2O is balanced,the coefficient: Of O2 is:

What are the coefficients for the following reaction when it is properly balanced? ___potassium iodide + ___lead (II) acetate → ___lead (II) iodide +___potassium acetate

What are the coefficients for the following reaction when it is properly balanced? ___HCl + ___Mg → ___MgCl2 + ___H2

What are the coefficients for the following reaction when it is properly balanced? ___O2 + ___CH4 → ___CO2 + ___H2O

When the equation __NO2 + __H2O + __O2 → __HNO3 is balanced,the coefficient of HNO3 is:

When water is heated,bubbles form in the water.Is this evidence of a chemical reaction? Why?

When the equation __Ca3N2 + __H2O → __Ca(OH) 2 + __NH3 is balanced,the coefficient of H2O is:

The reaction 2 KClO3 → 2 KCl + 3 O2 would be correctly classified as a decomposition reaction.

When the equation,___N2 + ___H2 → ___NH3 is balanced,the coefficient of hydrogen is:

What are the coefficients for the following reaction when it is properly balanced? ___nitric acid + ___sodium hydroxide → ___sodium nitrate + ___water

What are the coefficients for the following reaction when it is properly balanced? _nitrogen monoxide + _carbon monoxide → _nitrogen +_carbon dioxide

It has been shown that the ozone molecule (O₃)can be formed when a single oxygen atom (O)adds to a molecule of oxygen (O₂),so this type of reaction is known as a double displacement reaction.

What are the coefficients for the following reaction when it is properly balanced? _Na₃PO₄ + _Ba(NO₃) ₂→ _NaNO₃ + _Ba₃(PO₄) ₂

When the equation,_O₂+ _C₅H₁₂ → _CO₂ + _H₂Ois balanced,the coefficient: Of O₂is:

What are the coefficients for the following reaction when it is properly balanced? _potassium iodide + _lead (II) acetate → _lead (II) iodide +_potassium acetate

What are the coefficients for the following reaction when it is properly balanced? _HCl + _Mg → _MgCl₂ + _H₂

What are the coefficients for the following reaction when it is properly balanced? _O₂ + _CH₄→ _CO₂ + _H₂O

When the equation NO₂ + H₂O + O₂ → HNO₃ is balanced,the coefficient of HNO₃ is:

When the equation Ca₃N₂ + H₂O → Ca(OH) ₂ + NH₃ is balanced,the coefficient of H₂O is:

The reaction 2 KClO₃ → 2 KCl + 3 O₂ would be correctly classified as a decomposition reaction.

When the equation,_N₂+ _H₂ → ___NH₃ is balanced,the coefficient of hydrogen is:

What are the coefficients for the following reaction when it is properly balanced? _nitric acid + _sodium hydroxide → _sodium nitrate + _water