Question

question 3
1 pts
according to the video, which law explains why equations must be balanced?
○ law of matching numbers
○ law of conservation of mass
○ law of energy transfer
○ law of atomic motion
question 4
1 pts
which part of a chemical equation can you change when balancing?
○ coefficients only
○ subscripts only
○ you can change anything
○ you cannot change anything

Explanation:

• Question 3: The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. This means that the total mass of the reactants must equal the total mass of the products, so chemical equations must be balanced.
• Question 4: When balancing a chemical equation, only the coefficients (the numbers in front of the chemical formulas) can be changed. Changing subscripts (the numbers within the chemical formulas) would change the identity of the substances involved in the reaction.

Answer:

• Question 3: Law of Conservation of Mass
• Question 4: Coefficients only