Balancing Chemical Equations Quiz

What is the first step in balancing a chemical equation according to the video?

• Balance oxygen first.

• Start with the element that appears most frequently.

• Put a zero in front of each chemical species.

• Add coefficients to balance atoms.

Which element should you avoid starting with when balancing this equation?

• Oxygen

• Phosphorus

• Chlorine

• Hydrogen

How do you balance hydrogen in the given equation?

• Add a coefficient of 3 to H3P4.

• Add a subscript of 3 to HCl4.

• Add a coefficient of 2 to HCl4.

• Add a subscript of 2 to H3P4.

What is the challenge when balancing chlorine in this equation?

• Chlorine requires a fractional coefficient.

• Chlorine is already balanced.

• Chlorine appears in multiple compounds.

• Chlorine is not present on the product side.

How do you convert a fractional coefficient into a whole number?

• Add more reactants.

• Add a subscript to the compound.

• Divide all coefficients by the numerator.

• Multiply all coefficients by the denominator.

What is the total number of oxygen atoms needed on the product side?

• 29

• 21

• 24

• 8

How many phosphorus atoms are present on the product side after balancing?

• One

• Two

• Three

• Four

What is the final step to ensure all coefficients are whole numbers?

• Multiply by the smallest coefficient.

• Multiply by the largest coefficient.

• Add more reactants.

• Multiply by the denominator of any fraction.

What is the final balanced equation for the given chemical reaction?

• 2HCl4 + P4O10 → 2H3P4 + 3Cl2O7

• 6HCl4 + 2P4O10 → 6H3P4 + 3Cl2O7

• HCl4 + P4O10 → H3P4 + Cl2O7

• 3HCl4 + 2P4O10 → 3H3P4 + 4Cl2O7

What should you do to find the number of each type of atom in the balanced equation?

• Subtract two from each coefficient.

• Add two to each coefficient.

• Multiply everything in the table by two.

• Divide all coefficients by two.