Balancing Chemical Equations Practice

The video tutorial explains how to balance a chemical equation involving copper II sulfate and potassium iodide. It begins by counting the atoms on both sides of the equation and then focuses on balancing iodine atoms by adjusting coefficients. The tutorial continues with balancing potassium and sulfate ions, making final adjustments to achieve a balanced equation. The process is explained step-by-step, highlighting the importance of even numbers in balancing chemical reactions.

What are the initial reactants in the chemical equation discussed?

• Calcium carbonate and hydrochloric acid

• Sodium chloride and silver nitrate

• Copper(II) sulfate and potassium iodide

• Magnesium sulfate and sodium hydroxide

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

• Four

• Three

• Two

• One

What is the first step taken to balance the iodine atoms?

• Add a coefficient of 1 in front of CuI

• Add a coefficient of 4 in front of KI

• Add a coefficient of 2 in front of CuI

• Add a coefficient of 3 in front of KI

What is the result of placing a coefficient of 2 in front of CuI?

• Three iodine atoms

• Two iodine atoms

• Five iodine atoms

• Four iodine atoms

What adjustment is made to balance the potassium atoms?

• Add a coefficient of 3 in front of KI

• Add a coefficient of 2 in front of KI

• Add a coefficient of 4 in front of KI

• Add a coefficient of 1 in front of KI

How many potassium atoms are present after balancing?

• Five

• Four

• Three

• Two

What is the final step to balance the sulfates?

• Add a coefficient of 4 in front of K2SO4

• Add a coefficient of 2 in front of K2SO4

• Add a coefficient of 1 in front of K2SO4

• Add a coefficient of 3 in front of K2SO4

How many sulfate groups are present on each side after balancing?

• Two

• One

• Three

• Four

What is the balanced chemical equation for the reaction?

• CuSO4 + 2KI → CuI + I2 + K2SO4

• CuSO4 + 4KI → 2CuI + I2 + 2K2SO4

• 2CuSO4 + 4KI → 2CuI + I2 + 2K2SO4

• CuSO4 + KI → CuI + I2 + K2SO4

What was the key strategy used to balance the equation?

• Getting an even number of iodine atoms

• Balancing copper atoms first

• Balancing sulfate groups first

• Balancing potassium atoms first