Balancing Chemical Equations and Coefficients

This video tutorial explains how to balance the chemical equation Na + Br2 → NaBr. It begins by counting the atoms on each side of the equation, identifying that the bromine atoms are unbalanced. To balance the bromine atoms, a coefficient of 2 is added in front of NaBr, resulting in two bromine atoms on both sides. This adjustment also affects the sodium atoms, requiring a coefficient of 2 in front of Na to balance them. The video emphasizes the importance of applying coefficients to each atom in a compound and concludes with a balanced equation.

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

• One

• Three

• Two

• Four

What is the purpose of adding a coefficient of two in front of NaBr?

• To decrease the reaction speed

• To increase the reaction speed

• To balance bromine atoms

• To balance sodium atoms

After balancing bromine, how many bromine atoms are present on the product side?

• Two

• Three

• One

• Four

What coefficient is added in front of sodium to balance the equation?

• Two

• Three

• One

• Four

What happens to the number of sodium atoms when a coefficient is added in front of it?

• It triples

• It remains the same

• It doubles

• It decreases

What is the final balanced equation for the reaction between sodium and bromine gas?

• 2Na + 2Br2 → 2NaBr

• Na + 2Br2 → NaBr2

• 2Na + Br2 → 2NaBr

• Na + Br2 → NaBr