Balancing Chemical Reactions

Dr. B explains how to balance the chemical equation Ni + HCl. The process involves counting the atoms on both sides of the equation and adjusting the coefficients to ensure the number of each type of atom is equal on both sides. By placing a coefficient of two in front of HCl, the equation is balanced with two hydrogens and two chlorines on each side. The video concludes with a summary of the balanced equation.

What are the initial numbers of nickel, hydrogen, and chlorine atoms on the reactant side of the equation?

• 2 nickel, 1 hydrogen, 1 chlorine

• 2 nickel, 2 hydrogen, 2 chlorine

• 1 nickel, 1 hydrogen, 1 chlorine

• 1 nickel, 2 hydrogen, 2 chlorine

Why is it necessary to adjust the coefficients in the chemical equation?

• To reduce the number of reactants

• To change the reactants

• To balance the number of atoms on both sides

• To increase the number of products

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

• 4

• 2

• 1

• 3

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

• 1

• 4

• 2

• 3

What is the final balanced equation for the reaction between nickel and hydrochloric acid?

• Ni + HCl → NiCl + H2

• Ni + HCl → NiCl2 + 2H2

• 2Ni + HCl → NiCl2 + H2

• Ni + 2HCl → NiCl2 + H2