Multiple Choice
A sealed bag contains 10 g of iron filings and 5 g of sulfur. After the iron and sulfur react completely to form iron(II) sulfide inside the sealed bag, what will be the total mass of the bag and its contents?
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2. Atoms & Elements
Law of Conservation of Mass
Multiple Choice
Which statement is true regarding the Law of Conservation of Mass during a chemical reaction?
A
Mass is lost as energy when bonds are broken and formed.
B
The total mass of reactants equals the total mass of products.
C
The total mass of products is always greater than the mass of reactants.
D
The mass of the system increases due to bond formation.
Verified step by step guidance1
Understand the Law of Conservation of Mass: It states that mass cannot be created or destroyed in a chemical reaction.
Recognize that during a chemical reaction, atoms are rearranged but the total number of atoms remains the same.
Therefore, the total mass of the reactants before the reaction must be equal to the total mass of the products after the reaction.
Note that mass is not lost as energy; energy changes occur but mass remains constant in a closed system.
Conclude that the correct statement is: The total mass of reactants equals the total mass of products.
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