Balancing Chemical Equations

This video tutorial demonstrates how to balance the chemical equation for arsenic sulfide (As2S3) reacting with oxygen (O2). The instructor begins by counting the atoms on each side of the equation, then proceeds to balance the arsenic and sulfur atoms. Finally, the oxygen atoms are balanced, completing the equation. The video concludes with a tip to leave O2 balancing for last, as it simplifies the process.

What is the initial number of sulfur atoms on the reactant side in the equation for arsenic sulfide and oxygen?

• Six

• Four

• Three

• Two

How many arsenic atoms are present on the product side before balancing?

• Four

• Three

• Two

• One

What is the first element that is balanced in the equation?

• Oxygen

• Sulfur

• Arsenic

• Hydrogen

After balancing arsenic, what is the next element that is addressed?

• Sulfur

• Hydrogen

• Carbon

• Oxygen

What is the total number of oxygen atoms on the product side after recalculating?

• Fourteen

• Twelve

• Eighteen

• Twenty

How many oxygen molecules are needed to balance the equation?

• Six

• Eight

• Ten

• Nine

What is the key strategy mentioned for balancing equations with O2?

• Balance it first

• Leave it till last

• Ignore it

• Double it

Who is the presenter of the video tutorial?

• Dr. C

• Dr. D

• Dr. B

• Dr. A