Balancing Chemical Equations

The video tutorial explains how to balance the chemical equation Ca + O2 = CaO. It begins by counting the atoms on both sides of the equation, identifying that the equation is not balanced due to the unequal number of oxygen atoms. The tutorial then demonstrates how to balance the equation by adjusting the coefficients, first balancing the oxygen atoms and then the calcium atoms. The final balanced equation is presented as 2Ca + O2 = 2CaO.

What is the initial imbalance in the chemical equation of calcium and oxygen reacting to form calcium oxide?

• There are more calcium atoms on the reactant side.

• There are more oxygen atoms on the product side.

• There are more oxygen atoms on the reactant side.

• There are more calcium atoms on the product side.

What is the first step taken to balance the oxygen atoms in the equation?

• Add a coefficient in front of calcium.

• Remove an oxygen atom from the reactant side.

• Add a coefficient in front of calcium oxide.

• Remove an oxygen atom from the product side.

After balancing the oxygen atoms, what imbalance is introduced in the equation?

• There are more oxygen atoms on the product side.

• There are more calcium atoms on the product side.

• There are more calcium atoms on the reactant side.

• There are more oxygen atoms on the reactant side.

How is the imbalance in calcium atoms corrected in the final step?

• By removing a calcium atom from the reactant side.

• By adding a coefficient in front of calcium.

• By adding a coefficient in front of oxygen.

• By removing a calcium atom from the product side.

What is the balanced chemical equation for the reaction between calcium and oxygen?

• Ca + O2 → CaO

• Ca + 2O2 → CaO2

• 2Ca + O2 → 2CaO

• Ca2 + O2 → CaO2

What does the coefficient in front of a compound in a chemical equation indicate?

• The number of atoms in the compound.

• The number of molecules of the compound.

• The number of protons in the compound.

• The number of electrons in the compound.