Balancing Chemical Reactions

The video tutorial explains a double displacement reaction involving calcium oxide and hydrochloric acid. It begins by identifying the reactants and products, then counts the atoms on each side of the equation to determine that it is unbalanced. The tutorial demonstrates how to balance the equation by adjusting the coefficients, specifically focusing on doubling the hydrogens and chlorines. The final balanced equation is presented as CaO + 2HCl → CaCl2 + H2O. The video concludes with a summary of the balanced equation.

What type of reaction occurs between calcium oxide and hydrochloric acid?

• Synthesis reaction

• Double displacement reaction

• Single displacement reaction

• Decomposition reaction

How many hydrogen atoms are present on the product side before balancing?

• One

• Four

• Two

• Three

Which atoms were identified as unbalanced in the initial equation?

• Calcium and hydrogen

• Oxygen and chlorine

• Hydrogen and chlorine

• Calcium and oxygen

What change is made to balance the hydrogen and chlorine atoms?

• Add a coefficient of 2 in front of CaO

• Add a coefficient of 2 in front of HCl

• Add a coefficient of 2 in front of H2O

• Add a coefficient of 2 in front of CaCl2

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

• One

• Two

• Three

• Four

What is the final balanced equation for the reaction?

• CaO + HCl → CaCl2 + H2O

• CaO + 2HCl → CaCl2 + 2H2O

• CaO + 2HCl → CaCl2 + H2O

• CaO + HCl → CaCl2 + 2H2O