Combustion reaction module 5

Which of the following is not a side effect of an incomplete combustion reaction?

• Production of poisonous gas

• Release of carbon monoxide that causes suffocation

• Increases the ability of red blood cells to carry oxygen

• Reduces the ability of red blood cells to carry oxygen

The product(s) of complete combustion of any hydrocarbon is/are _________________.

I. water

II. carbon dioxide

III. carbon monoxide

• I

• III

• I and II

• I and III

Which of the following reactions is/are an incomplete combustion reaction?

• C5H10 + 5 O2 → 5 CO + 5 H2O

• C2H4 + 3O2 → 2CO2 + 2H2O

• 2CH4 + 3O2 → 2CO + 4H2O

• Both A and C

The correct balanced chemical equation for the reaction taking place is _____.

• C2H6 + 7O2 → 4CO2 + 6H2O

• 2C2H6 + 7O2 →4CO2 + 6H2O

• 2C2H6 +14O2 →4CO2 + 6H2O

• C2H6 + 7O2 → 2 CO2 + 3H2O

Liquid methanol burns completely in the presence of oxygen to give carbon dioxide and water vapor according to following unbalanced equation.

___. 𝐂𝐇_𝟑 𝐎𝐇(𝐥). + 𝟑𝐎_𝟐(𝐠). →. 𝟐𝐂𝐎_𝟐(𝐠) +___ 𝐇_𝟐𝐎(𝒍)

The coefficient of CH₃OH is _______, while the coefficient of H₂O is ______.

• 2 4

• 4 8

• 6 8

• 8 10

Incomplete combustion is harmful to humans because it ___________________.

• increases the level of sugar in the blood

• produces large amounts of carbon dioxide

• decreases the amount of sugar in the blood

• produces carbon monoxide that reduces the level of oxygen in the blood

How to identify if the combustion is complete or incomplete?

• lime water turns milky

• red litmus paper turns blue

• lead acetate paper turns black

• Potassium dichromate solution turns green