Law of Conservation of Mass in Chemical Reactions
Chemistry ⇒ Chemical Reactions and Equations
Law of Conservation of Mass in Chemical Reactions starts at 9 and continues till grade 12.
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A chemical reaction takes place in an open beaker and produces a gas. The mass of the beaker and contents decreases after the reaction. Does this violate the Law of Conservation of Mass? Explain.
A reaction vessel contains 50 g of reactants. After the reaction, the products are found to weigh 48 g. What could explain this discrepancy?
A student performs a reaction and finds the mass of the products is less than the mass of the reactants. What should the student check to ensure the Law of Conservation of Mass is not violated?
Describe an experiment that demonstrates the Law of Conservation of Mass.
A chemical reaction takes place in an open beaker and produces a gas. The mass of the beaker and contents decreases after the reaction. Does this violate the Law of Conservation of Mass? Explain.
A reaction in a sealed container produces a gas. If the total mass before the reaction was 100 g, what will be the total mass after the reaction?
A reaction vessel contains 50 g of reactants. After the reaction, the products are found to weigh 48 g. What could explain this discrepancy?
A student mixes 25 g of sodium with 39 g of chlorine. After the reaction, 10 g of sodium remains unreacted. What is the mass of sodium chloride formed?
Which of the following best describes the Law of Conservation of Mass?
(1) The mass of products is always greater than the mass of reactants.
(2) The mass of reactants is always greater than the mass of products.
(3) The mass of reactants equals the mass of products.
(4) Mass can be created during a chemical reaction.
Which of the following best explains why chemical equations must be balanced?
(1) To satisfy the Law of Conservation of Mass
(2) To make the reaction faster
(3) To increase the yield of products
(4) To use more reactants
Which of the following chemical equations is balanced, demonstrating the Law of Conservation of Mass?
(1) H2 + O2 → H2O
(2) 2H2 + O2 → 2H2O
(3) H2 + 2O2 → 2H2O
(4) 2H2 + 2O2 → 2H2O
Which of the following is a direct implication of the Law of Conservation of Mass?
(1) Atoms can be destroyed in a chemical reaction.
(2) The total mass of substances remains constant during a chemical reaction.
(3) Energy is always conserved in a chemical reaction.
(4) The number of molecules always remains the same.
Fill in the blank: According to the Law of Conservation of Mass, the mass of _______ in a chemical reaction is equal to the mass of _______.
Fill in the blank: In a chemical reaction, the total number of each type of _______ is conserved.
Fill in the blank: The Law of Conservation of Mass is essential for writing _______ chemical equations.
Fill in the blank: The Law of Conservation of Mass is valid only in a _______ system.
True or False: In a closed system, the total mass before and after a chemical reaction remains the same.
True or False: The Law of Conservation of Mass applies only to physical changes, not chemical reactions.
True or False: The Law of Conservation of Mass is a fundamental principle in chemistry.
True or False: The Law of Conservation of Mass is also known as the Law of Indestructibility of Matter.
