Balancing Equations Quiz 2

1. Balance the following chemical equation and identify the correct coefficients for the reactants and products: C4H10 + O2 → CO2 + H2O

1, 5, 4, 6

2, 13, 8, 10

1, 6.5, 4, 5

2, 8, 6, 7

To balance the equation, follow these steps:

Write the unbalanced equation: C4H10 + O2 → CO2 + H2O

Balance carbon atoms: C4H10 + O2 → 4CO2 + H2O

Balance hydrogen atoms: C4H10 + O2 → 4CO2 + 5H2O

Balance oxygen atoms: Total oxygen atoms on the product side = (4 * 2) + (5 * 1) = 8 + 5 = 13

Balance oxygen atoms on the reactant side: C4H10 + 13/2 O2 → 4CO2 + 5H2O

To avoid fractional coefficients, multiply the entire equation by 2: 2C4H10 + 13O2 → 8CO2 + 10H2O

Thus, the correct balanced equation has the coefficients 2, 13, 8, 10, corresponding to answer B.

Explanation

To balance the equation, follow these steps:

Write the unbalanced equation: C4H10 + O2 → CO2 + H2O

Balance carbon atoms: C4H10 + O2 → 4CO2 + H2O

Balance hydrogen atoms: C4H10 + O2 → 4CO2 + 5H2O

Balance oxygen atoms: Total oxygen atoms on the product side = (4 * 2) + (5 * 1) = 8 + 5 = 13

Balance oxygen atoms on the reactant side: C4H10 + 13/2 O2 → 4CO2 + 5H2O

To avoid fractional coefficients, multiply the entire equation by 2: 2C4H10 + 13O2 → 8CO2 + 10H2O

Thus, the correct balanced equation has the coefficients 2, 13, 8, 10, corresponding to answer B.

2. ____ K₂SO₃ + ____ Mn(OH)₂ --> ____ KOH + ____ MnSO₃ _{What kind of reaction does the above equation represent?}

Synthesis

Decomposition

Single replacement

Double replacement

The given equation represents a double replacement reaction. In a double replacement reaction, the positive and negative ions of two compounds switch places to form new compounds. In this equation, the potassium ions from K2SO3 switch places with the hydroxide ions from Mn(OH)2 to form KOH, and the sulfite ions from K2SO3 switch places with the manganese ions from Mn(OH)2 to form MnSO3.

Explanation

The given equation represents a double replacement reaction. In a double replacement reaction, the positive and negative ions of two compounds switch places to form new compounds. In this equation, the potassium ions from K2SO3 switch places with the hydroxide ions from Mn(OH)2 to form KOH, and the sulfite ions from K2SO3 switch places with the manganese ions from Mn(OH)2 to form MnSO3.

3. What type of reaction is this? ____ Br₂ + ____ LiF --> ____ LiBr + ____ F₂

Synthesis

Decomposition

Single replacement

Double replacement

In this reaction, a single element (Br2) replaces another element (F) in a compound (LiF). This type of reaction is known as a single replacement reaction.

Explanation

In this reaction, a single element (Br2) replaces another element (F) in a compound (LiF). This type of reaction is known as a single replacement reaction.

4. What are the correct coefficients for the following equation? ____ Br₂ + ____ LiF --> ____ LiBr + ____ F₂

2, 4, 4, 2

1, 2, 3, 1

1, 2, 2, 1

The equation represents the reaction between bromine (Br2) and lithium fluoride (LiF) to form lithium bromide (LiBr) and fluorine (F2). To balance the equation, we need to ensure that the number of each type of atom is the same on both sides. In this case, there are 2 bromine atoms on the left side, so we need 2 LiBr molecules on the right side to balance it. Similarly, there are 2 fluorine atoms on the right side, so we need 2 F2 molecules on the left side. Therefore, the correct coefficients for the equation are 1, 2, 2, 1.

Explanation

The equation represents the reaction between bromine (Br2) and lithium fluoride (LiF) to form lithium bromide (LiBr) and fluorine (F2). To balance the equation, we need to ensure that the number of each type of atom is the same on both sides. In this case, there are 2 bromine atoms on the left side, so we need 2 LiBr molecules on the right side to balance it. Similarly, there are 2 fluorine atoms on the right side, so we need 2 F2 molecules on the left side. Therefore, the correct coefficients for the equation are 1, 2, 2, 1.

5. ____ Ni(OH)₃ --> ____ Ni₂O₃ + ____ H₂O When the above equation is balanced, what is the coefficient for nickle (III) oxide?

2

1

3

In the balanced equation, the coefficient for nickel (III) oxide is 1. This means that for every 1 molecule of nickel (III) oxide, there are 1 molecule of nickel hydroxide and 3 molecules of water.

Explanation

In the balanced equation, the coefficient for nickel (III) oxide is 1. This means that for every 1 molecule of nickel (III) oxide, there are 1 molecule of nickel hydroxide and 3 molecules of water.