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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See sample questions for grade 10
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?
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?
A student reacts 10 g of calcium with 17 g of chlorine to form calcium chloride. What is the mass of calcium chloride formed?
Describe an experiment that demonstrates the Law of Conservation of Mass.
Explain how the Law of Conservation of Mass is demonstrated in the reaction: 2H2 + O2 → 2H2O.
Explain why it is important to balance chemical equations in relation to the Law of Conservation of Mass.
Explain why the mass of a burning candle appears to decrease, even though the Law of Conservation of Mass holds true.
If 12 g of carbon reacts completely with 32 g of oxygen, what is the mass of carbon dioxide formed?
In a chemical reaction, 20 g of substance A reacts with 30 g of substance B to form 40 g of substance C. What is the mass of the other product formed?
In a reaction, 5 g of hydrogen reacts with 40 g of oxygen to form water. What is the total mass of water produced?
State the Law of Conservation of Mass.
Why might the Law of Conservation of Mass appear to be violated in an open system?
