Balancing Chemical Equations and Reactions

In this video, Dr. B demonstrates how to balance the chemical equation for aluminum hydride (AlH3) reacting with carbon dioxide (CO2) to produce methane (CH4) and aluminum oxide (Al2O3). The process involves trial and error, starting with balancing aluminum and hydrogen atoms, followed by methane and carbon, and finally adjusting oxygen atoms. The key to balancing this equation was achieving an even number of atoms, which simplified the process. The video concludes with a balanced equation and highlights the importance of strategic adjustments in chemical balancing.

What are the products formed when aluminum hydride reacts with carbon dioxide?

• Carbon dioxide and aluminum hydride

• Hydrogen gas and aluminum carbonate

• Water and carbon monoxide

• Methane gas and aluminum oxide

What was the initial approach to balance the aluminum atoms in the equation?

• Placing a 2 in front of aluminum hydride

• Adding a coefficient of 3 to carbon dioxide

• Balancing hydrogen atoms first

• Adjusting the methane coefficient

Why was balancing aluminum oxide first considered beneficial?

• It simplified the balancing of hydrogen atoms

• It provided an even number of aluminum atoms

• It eliminated the need to balance oxygen

• It reduced the number of carbon atoms

How many aluminum atoms are present after balancing aluminum oxide?

• 4 aluminum atoms

• 2 aluminum atoms

• 6 aluminum atoms

• 8 aluminum atoms

What coefficient was used in front of methane to balance hydrogen atoms?

• 3

• 5

• 2

• 4

How many carbon atoms are present after balancing methane?

• 4 carbon atoms

• 3 carbon atoms

• 2 carbon atoms

• 1 carbon atom

What coefficient was used in front of carbon dioxide to balance the equation?

• 4

• 3

• 2

• 1

How many oxygen atoms are present after balancing the equation?

• 5 oxygen atoms

• 7 oxygen atoms

• 4 oxygen atoms

• 6 oxygen atoms

What was the key to successfully balancing the equation?

• Balancing hydrogen atoms first

• Achieving an even number of aluminum atoms

• Ignoring oxygen atoms

• Using a trial and error method

What is the final balanced equation for the reaction?

• 2AlH3 + CO2 → CH4 + 2Al2O3

• 4AlH3 + 3CO2 → 3CH4 + 2Al2O3

• AlH3 + CO2 → CH4 + Al2O3

• 2AlH3 + 3CO2 → 3CH4 + Al2O3