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Chemistry Concepts: Mass Conservation & Composition

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Chemistry Concepts: Mass Conservation & Composition

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Questions and Answers

What does the Law of Conservation of Mass state about the mass during a chemical reaction?

The mass remains constant throughout the reaction. (correct)

The mass decreases as energy is released.

The mass increases due to the formation of new compounds.

The mass can be ignored if the reaction is exothermic.

Which of the following best illustrates the Law of Constant Composition?

In every chemical reaction, the masses of reactants and products can vary.

9 grams of water is made up of 1 gram of hydrogen and 8 grams of oxygen. (correct)

Water can be formed from varying ratios of hydrogen and oxygen.

9 grams of water always contains 2 grams of hydrogen and 7 grams of oxygen.

What should be the outcome when weighing the flask before and after mixing the solutions in the activity?

The mass should increase due to evaporation.

The mass will fluctuate depending on the temperature.

The mass should remain unchanged if no material escapes. (correct)

The mass should be lower after mixing due to gas release.

Which of the following compounds exemplifies the Law of Constant Composition?

<p>Carbon dioxide always contains 1 atom of carbon and 2 atoms of oxygen.</p> Signup and view all the answers

In the provided activity, which chemical solution combinations were used?

<p>Barium chloride and sodium sulfate.</p> Signup and view all the answers

Study Notes

Law of Conservation of Mass

The mass of a closed system remains constant during a chemical reaction.
This means that the total mass of the reactants before the reaction is equal to the total mass of the products after the reaction.
In an experiment involving two solutions (X and Y) mixed in a flask, the mass of the flask and its contents remains the same before and after the reaction.

Law of Constant Composition

Compounds are formed by two or more elements in a definite proportion by mass.
This means that the ratio of the masses of the elements in a particular compound is always the same, regardless of the source of the compound.
Example: Water always contains hydrogen and oxygen in a mass ratio of 1:8.

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Description

Explore the fundamental principles of the Law of Conservation of Mass and the Law of Constant Composition in this quiz. Understand how mass remains constant during chemical reactions and how compounds are formed in definite proportions. Test your knowledge on these essential chemistry concepts!