Balancing Chemical Equations Practice

In this video, Dr. B demonstrates how to balance the chemical equation for phosphorus and bromine gas to form phosphorus tribromide. The process involves counting the number of atoms on each side of the equation, then adjusting coefficients to ensure both sides have equal numbers of each type of atom. The video explains the steps to balance phosphorus and bromine atoms, resulting in a balanced chemical equation.

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

• Four

• Three

• Two

• One

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

• One

• Two

• Four

• Three

What coefficient is used in front of phosphorus to balance the equation?

• Four

• Three

• Two

• One

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

• Three

• Two

• One

• Four

What is the final balanced chemical equation?

• 2P + Br2 → 2PBr3

• P + 2Br2 → PBr3

• 2P + 3Br2 → 2PBr3

• P + Br2 → PBr3