Fuels

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Questions and Answers

Which elements in a fuel combine with oxygen during combustion to form carbon dioxide and water vapor?

  • Carbon and hydrogen (correct)
  • Carbon and sulfur
  • Hydrogen and nitrogen
  • Oxygen and nitrogen

What is the main purpose of combustion?

  • To produce useful heat energy (correct)
  • To form sulfur compounds
  • To create toxic gases
  • To combine with nitrogen

What is perfect combustion also known as?

  • Spontaneous combustion
  • Incomplete combustion
  • Exothermic combustion
  • Stoichiometric combustion (correct)

Which element is involved in the incomplete combustion of sulfur?

<p>Oxygen (A)</p> Signup and view all the answers

What is the equation for the formation of sulfur dioxide?

<p>2S + O2 -&gt; SO2 (C)</p> Signup and view all the answers

Why is the formation of free sulfur undesirable?

<p>It represents a waste of fuel (A)</p> Signup and view all the answers

Which of the following conditions is required for complete combustion to occur?

<p>Sufficient air must be admitted to ensure all combustibles are burned. (A)</p> Signup and view all the answers

What is the equation for the complete combustion of carbon?

<p>$C + O_2 \rightarrow CO_2$ (D)</p> Signup and view all the answers

What is the equation for the incomplete combustion of hydrogen?

<p>$2H_2 + O_2 \rightarrow H_2O + H_2$ (D)</p> Signup and view all the answers

What are the products of incomplete combustion?

<p>$CO_2, SO_2, H_2O, N_2, CO, CH_4$ (D)</p> Signup and view all the answers

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