Balancing Chemical Equations Practice

In this video, Dr. B demonstrates how to balance the chemical equation Si + H2O -> SiO2 + H2. The process begins with counting the atoms on each side of the equation. Initially, the oxygen atoms are balanced by placing a coefficient of 2 in front of H2O. This adjustment also affects the hydrogen atoms, which are then balanced by ensuring there are four hydrogen atoms on both sides. The video concludes with the confirmation that the equation is balanced.

What is the initial number of silicon (Si) atoms on the reactant side of the equation?

• Three

• Two

• Four

• One

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

• One

• Two

• Three

• Four

What coefficient is used in front of H2O to balance the oxygen atoms?

• 1

• 4

• 2

• 3

After balancing, how many hydrogen atoms are there on each side of the equation?

• Two

• Three

• Four

• Five

What is the final balanced chemical equation?

• Si + H2O → 2SiO2 + H2

• 2Si + H2O → SiO2 + H2

• Si + 2H2O → SiO2 + 2H2

• Si + H2O → SiO2 + H2