Question 1: Which of the following best describes a balanced chemical equation?

Answer: The number of each type of atom on both sides is equal

Question 2: True or False: A chemical equation must follow the law of conservation of mass.

Answer: True

Question 3: Write a short explanation on why balancing chemical equations is necessary.

Answer: Balancing chemical equations ensures that the law of conservation of mass is followed, meaning no atoms are lost or gained in the reaction.

Question 4: Balance the following equation: H2 + O2 -> H2O

Answer: 2H2 + O2 -> 2H2O

Question 5: Match the following terms to their definitions:

Answer: See full answer key

Question 6: Place the following steps in the correct order for balancing a chemical equation: Identify reactants and products, Count atoms of each element, Use coefficients to balance atoms, Write the balanced equation.

Answer: See full answer key

Question 7: Fill in the blank: In a balanced chemical equation, the _______ of atoms for each element is equal on both sides.

Answer: number

Question 8: Explain how balancing chemical equations relates to the conservation of mass.

Answer: Balancing chemical equations ensures that the mass of the reactants equals the mass of the products, adhering to the law of conservation of mass. This means that during a chemical reaction, atoms are rearranged but not created or destroyed. Thus, balancing equations is a way to verify that the same amount of each element is present before and after the reaction.

Question 9: True or False: The coefficients in a balanced chemical equation can be fractions.

Answer: False

Question 10: What is the first step in balancing a chemical equation?

Answer: Identify the reactants and products

Question 11: Balance the equation: N2 + H2 -> NH3.

Answer: N2 + 3H2 -> 2NH3

Question 12: Describe the importance of using coefficients in balancing chemical equations.

Answer: Coefficients are used to balance the number of atoms for each element on both sides of the equation, ensuring the reaction obeys the conservation of mass.

Question 13: Which of the following is an example of a balanced equation?

Answer: 2CO + O2 -> 2CO2

Question 14: Explain how you would balance the equation: C3H8 + O2 -> CO2 + H2O.

Answer: To balance the equation, first count the number of each type of atom in the reactants and products. Adjust coefficients to balance the number of carbon, hydrogen, and oxygen atoms. Start with balancing carbon atoms, then hydrogen, and finally oxygen. Ensure that the total number of each atom type is equal on both sides of the equation.

Question 15: Multiple choice: Which of the following chemical equations is balanced?

Answer: 2H2 + O2 -> 2H2O