Balancing Chemical Equations

The video tutorial explains how to balance a chemical equation involving calcium hydroxide (Ca(OH)2) and carbonic acid (H2CO3). It begins by identifying the reactants and products, then counts the atoms on both sides of the equation. The tutorial highlights the need to balance hydrogen and oxygen atoms, suggesting placing a coefficient in front of H2O to achieve balance. The process concludes with a balanced equation, ensuring equal numbers of each type of atom on both sides.

What are the reactants in the given chemical equation?

• Calcium hydroxide and carbonic acid

• Calcium oxide and hydrogen

• Calcium carbonate and water

• Carbon dioxide and water

How many oxygen atoms are initially counted on the reactant side?

• Two

• Three

• Four

• Five

What is the total number of hydrogen atoms on the reactant side before balancing?

• Two

• Four

• Three

• Six

What adjustment is made to balance the hydrogen atoms?

• Adding a coefficient of 2 in front of H2O

• Adding a coefficient of 3 in front of H2O

• Adding a coefficient of 2 in front of CO2

• Removing an oxygen atom

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

• Four

• Five

• Six

• Three

What is the final balanced equation for the reaction?

• CaCO3 + H2O → Ca(OH)2 + CO2

• CaO + H2O → Ca(OH)2

• Ca(OH)2 + CO2 → CaCO3 + H2O

• Ca(OH)2 + H2CO3 → CaCO3 + 2H2O

Who is the presenter of the balanced equation tutorial?

• Dr. B

• Dr. D

• Dr. A

• Dr. C