Balance of equations lesson

Multiple Choice

Oxidation states for

CaCrO₄

• Ca=+2, Cr=+6, O=-2

• Ca=+2, Cr=+4, O=-2

• Ca=+2, Cr=+6, O=-8

• Ca=+4, Cr=+6, O=-2

Multiple Choice

In the reaction, 2Na(s) + Cl₂(g) ⟶ 2NaCl(s), what is the oxidizing agent?

Given the Half-Reaction:

2Na(s) ⟶ 2Na⁺(s) + 2e⁻

Cl₂(g) + 2e⁻ ⟶ 2Cl⁻(s)

• Cl

• Na

• NaCl

Multiple Choice

Oxidation is the loss of electron, meaning, there is an increase of oxidation number

• True

• False

Multiple Choice

Which statement is true:
Mg → Mg²⁺ + 2e^–

• Mg gains 2 electrons

• Mg_²⁺ loses 2 electrons

• Mg loses 1 electron

• Mg loses 2 electrons

Multiple Choice

Which of the following half reactions correctly represents a reduction half reaction?

• Fe →Fe²⁺ + 2e^-

• Pb⁴⁺ + 2e^- →Pb²⁺

• 2O^-2 →O₂ + 4e^-

• Fe + 3e^- →Fe³⁺

Multiple Choice

Which half-reaction correctly represents reduction?

• Ag --> Ag⁺ + e^-

• F₂ --> 2 F^- + 2e^-

• Au³⁺ + 3e^- --> Au

• Fe²⁺ + e^- --> Fe³⁺

Multiple Choice

This is the half reaction for: 
Sn(s) → Sn⁴⁺(aq) + 4e⁻

• redox

• reduction

• oxidation

• neutralization

Multiple Choice

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1

• 2

• 3

• 4

Multiple Choice

Which equation is balanced?

• PbO₂ + 2H₂

• SO₂ + H₂0 --> H₂SO₄

• 2Na + 2H₂O --> 2NaOH + H₂

Multiple Choice

How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl₂ + H₂

• 1

• 2

• 3

• 4

Multiple Choice

What law governs the balancing of chemical equations?

• Law of Energy

• Law of Conservation of Matter/Mass

• Law of Gravity

• Law of Matter Movement

Multiple Choice

What is the total number of atoms present in 5Na₃PO₄

• 5

• 40

• 55

• 8

Multiple Choice

Balance this equation

Al +HCl --> H₂ +AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Multiple Choice

What are the coefficients that would properly balance this equation?

Ca + H₂O --> Ca(OH)₂ + H₂

• 2,1 --> 2,1

• 1,2 --> 1,1

• 1,2 --> 2,4

• 1,2 --> 2,1

Multiple Choice

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + Fe₂O₃--> Fe + __CO₂

• 3,1 --> 2,3

• 3,2 --> 1,1

• 3,2 --> 2,4

• 3,2 --> 2,1

Multiple Choice

What are the coefficients that would properly balance this equation?

AgNO₃ + H₂S --> Ag₂S+ HNO₃

• 2,1 --> 1,2

• 1,2 --> 1,1

• 1,2 --> 1,2

• 1,2 --> 2,1

Multiple Choice

What are the coefficients that would properly balance this equation?

H₂ + S --> __H₂S

• 1,1 --> 1

• 2,2 --> 2

• 1,2 --> 1

• 1,2 --> 2

Multiple Choice

What are the coefficients that would properly balance this equation?

Al + O₂--> __Al₂O₃

• 4,1 --> 2

• 4,3 --> 4

• 3,4 --> 1

• 4,3 --> 2

Multiple Choice

Determine the coefficients to make the following equation balanced?

N₂ + O₂--> __NO

• 1, 1, 1

• 1, 1, 2

• 2, 2, 2

• 1, 2, 2

Multiple Choice

Determine the coefficients to balance the equation.

Al +HCl --> H₂ +AlCl₃

• 2,6,3,2

• it's already balanced

• 4,12,3,4

• 2,1,4,5

Multiple Choice

Balance the the following equation.

Zn+HCl -->__ZnCl₂ +__H₂

• 1,1,2,1

• 1,1,1,2

• 1,2,1,1

• 2,1,1,1

Multiple Choice

Which number should go in the blank?
Mn + _ HNO₃ → Mn(NO₃)₂ + H₂

• 1

• 2

• 3

• 0

Multiple Choice

The numbers needed to balance the equation are:

• 1, 1, 1, 2

• 1, 1, 2, 2

• 1, 1, 1, 1

• 2, 3, 1, 3

Multiple Choice

The numbers needed to balance the equation are:

• 2, 7, 6, 4

• 2, 1, 3, 2

• 1, 1, 3, 2

• 2, 3, 1, 3

Multiple Choice

The numbers needed to balance the equation are:

• 2, 7, 6, 4

• 2, 1, 3, 2

• 3, 1, 1, 3

• 2, 3, 1, 3