Balancing Chemical Equations

The video tutorial demonstrates how to balance the chemical equation PCl3 + H2O. It begins by counting the atoms on both sides of the equation, focusing on phosphorus, chlorine, hydrogen, and oxygen. The tutorial then explains the process of balancing the equation by adjusting coefficients, starting with chlorine, followed by hydrogen, and finally oxygen. The key strategy highlighted is to leave oxygen balancing until the end. The video concludes with a balanced equation and emphasizes the importance of a systematic approach.

What is the initial number of chlorine atoms on the reactant side of the equation?

• Four

• One

• Two

• Three

How many hydrogen atoms are initially present on the product side?

• One

• Four

• Two

• Six

What coefficient is placed in front of HCl to balance the chlorine atoms?

• 2

• 1

• 4

• 3

After balancing chlorine, how many total hydrogen atoms are there on the product side?

• Six

• Five

• Seven

• Four

What coefficient is used to balance the hydrogen atoms on the reactant side?

• 2

• 3

• 4

• 5

How many oxygen atoms are there on the product side after balancing?

• One

• Two

• Three

• Four

What is the key strategy mentioned for balancing this equation?

• Start with phosphorus

• Start with hydrogen

• Start with oxygen

• Start with chlorine

What is the final balanced equation for PCl3 and H2O?

• PCl3 + 3H2O → H3PO3 + 3HCl

• PCl3 + 3H2O → H3PO4 + 3HCl

• PCl3 + H2O → H3PO3 + HCl

• PCl3 + 3H2O → H3PO3 + 3HCl