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 in a closed container starts with 100 g of reactants. After the reaction, the products and container together weigh 100 g. What does this indicate?
Describe an experiment that demonstrates the Law of Conservation of Mass.
Describe how the Law of Conservation of Mass applies to the reaction: 2H2 + O2 → 2H2O.
Describe what would happen to the measured mass if a gas produced in a reaction escapes from an open container.
A chemical reaction in a closed container starts with 100 g of reactants. After the reaction, the products and container together weigh 100 g. What does this indicate?
A reaction starts with 15 g of reactants and produces 10 g of product A and 5 g of product B. Is mass conserved?
A reaction starts with 8 g of methane and 32 g of oxygen. After combustion, 22 g of carbon dioxide and 18 g of water are formed. Is mass conserved?
A reaction vessel contains 20 g of sodium and 35.5 g of chlorine. After the reaction, 5 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 is lost during chemical reactions.
Which of the following best describes the mass change in a chemical reaction carried out in a closed system?
(1) Mass increases
(2) Mass decreases
(3) Mass remains constant
(4) Mass fluctuates randomly
Which of the following best explains why balancing chemical equations is necessary?
(1) To ensure the Law of Conservation of Mass is obeyed
(2) To make the reaction faster
(3) To increase the yield of products
(4) To change the physical state of reactants
Which of the following is a direct implication of the Law of Conservation of Mass?
(1) The need to balance chemical equations
(2) The formation of new elements
(3) The destruction of atoms
(4) The loss of mass as heat
Fill in the blank: According to the Law of Conservation of Mass, the mass of the _______ is equal to the mass of the products in a chemical reaction.
Fill in the blank: In a chemical reaction, the total number of _______ of each element is conserved.
Fill in the blank: The Law of Conservation of Mass is also known as the Law of Conservation of _______.
Fill in the blank: The Law of Conservation of Mass is fundamental to the process of _______ chemical equations.
A reaction starts with 15 g of reactants and produces 10 g of product A and 5 g of product B. Is mass conserved?
A reaction starts with 8 g of methane and 32 g of oxygen. After combustion, 22 g of carbon dioxide and 18 g of water are formed. Is mass conserved?
A reaction vessel contains 25 g of reactants. After the reaction, 20 g of product is collected and 5 g of gas escapes. Is the Law of Conservation of Mass obeyed?
A sealed flask contains 50 g of reactants. After the reaction, the products and flask together weigh 50 g. Does this support the Law of Conservation of Mass?
