Balancing Chemical Equations and Atoms

The video tutorial demonstrates how to balance the chemical equation CuCl2 + Na2S. It begins by counting the atoms on both sides of the equation, identifying the imbalance, and then adjusting the coefficients to achieve balance. The tutorial concludes with the balanced equation: copper(II) chloride plus sodium sulfide yields copper(II) sulfide plus sodium chloride.

What is the initial chemical equation presented in the video?

• CuCl + Na2SO4

• Cu2S + NaCl

• CuSO4 + NaCl

• CuCl2 + Na2S

How many chlorine atoms are present on the reactant side initially?

• One

• Four

• Two

• Three

Which element's atoms are not balanced initially on the product side?

• Chlorine

• Sodium

• Sulfur

• Copper

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

• 1

• 3

• 2

• 4

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

• Three

• One

• Two

• Four

What is the final balanced equation?

• CuCl2 + Na2S → CuS + 2NaCl

• CuCl2 + 2NaCl → Cu2S + Na2S

• CuCl2 + Na2S → CuS + NaCl

• CuCl2 + Na2S → Cu2S + NaCl

Who is the presenter of the video?

• Dr. C

• Dr. B

• Dr. D

• Dr. A