Balancing Chemical Reactions

The video tutorial explains a neutralization reaction involving zinc hydroxide and phosphoric acid, resulting in zinc phosphate and water. It demonstrates a method to balance the chemical equation by treating the phosphate ion as a single unit, simplifying the process. The tutorial provides a step-by-step guide to balancing the equation, focusing on zinc, oxygen, and hydrogen atoms, and offers tips for handling polyatomic ions.

What are the products of the neutralization reaction between zinc hydroxide and phosphoric acid?

• Zinc chloride and water

• Zinc sulfate and oxygen

• Zinc oxide and hydrogen

• Zinc phosphate and water

Why is the phosphate ion treated as a single unit during the balancing process?

• It is not involved in the reaction.

• It reacts with water to form a new compound.

• It remains intact on both sides of the equation.

• It is a complex ion that breaks apart easily.

What is the first element adjusted in the balancing process of this reaction?

• Oxygen

• Hydrogen

• Zinc

• Phosphate

How many zinc atoms are present on the product side after balancing?

• Four

• Two

• One

• Three

What is the total number of hydrogen atoms on the reactant side after balancing phosphates?

• Twelve

• Six

• Fifteen

• Nine

What coefficient is used for water to balance the hydrogen atoms?

• Six

• Eight

• Four

• Two

What is the key strategy mentioned for balancing equations involving polyatomic ions?

• Treat them as a single unit if they appear unchanged on both sides.

• Ignore them as they do not affect the balance.

• Balance them first before any other element.

• Break them down into individual elements.

Why couldn't the hydroxide ion be treated as a single unit in this reaction?

• It forms a complex with phosphoric acid.

• It is not present in the reactants.

• It breaks apart into water and other components.

• It reacts with zinc to form a new compound.

What is the final balanced equation for the reaction?

• 3 Zn(OH)2 + 2 H3PO4 → Zn3(PO4)2 + 6 H2O

• 3 Zn(OH)2 + H3PO4 → Zn3(PO4)2 + 3 H2O

• Zn(OH)2 + H3PO4 → Zn3(PO4)2 + H2O

• 2 Zn(OH)2 + 3 H3PO4 → Zn3(PO4)2 + 6 H2O

What is the main benefit of leaving oxygen and hydrogen balancing to the end?

• They are the least important elements.

• They are the most reactive elements.

• They are usually the most complex to balance.

• They are often involved in multiple compounds.