Which of the following choices gives the correct coefficients of the chemical equation, _Al + _O₂ → _ Al₂O₃ respectively?

• 2,2,2

• 2,3,2

• 4,2,2

• 4,3,2

Which of the following elements DOES NOT exist as diatomic in chemical reactions?

• Bromine

• Hydrogen

• Oxygen

• Sodium

Balance this equation

_ S + _ O₃ → _ SO₂

Note: Write the coefficient "1" to avoid ambiguity

Balance this equation

_ Zn + _ HCl → _ ZnCl₂ + _ H₂

Note: Write the coefficient "1" to avoid ambiguity

Balance this equation

_ C₅H₁₂ + _ O₂ → _ CO₂ + _ H₂O

Note: Write the coefficient "1" to avoid ambiguity

How do you write the balanced equation of burned propane (C₃H₈) in the presence of oxygen to produce water and carbon dioxide?

• C₃H₈ + O₂ → H₂O + CO₂

• C₃H₈ + O₂ → 4H₂O + 3CO₂

• C₃H₈ + 5O₂ → 4H₂O + 3CO₂

• C₃H₈ + 3O₂ → 2H₂O + 3CO₂

What type of reaction is shown:

C + H₂O → CH₄ + CO₂

• Single Displacement

• Double Displacement

• Combustion

• Synthesis

Balance the equation below

_C + _H₂O → _CH₄ + _CO₂

_{Note: Write the coefficient "1" to avoid ambiguity}

What type of reaction is shown in the equation below?

CH₄ + O₂ → CO₂ + H₂O

• Combination

• Decomposition

• Single Replacement

• Combustion

Balance the equation below

_ WO₃ + _H₂ → _W + _H₂O

_{Note: Write the coefficient "1" to avoid ambiguity}