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Questions and Answers
Which law of chemical combination states that matter can neither be created nor destroyed in a chemical reaction?
Which law of chemical combination states that matter can neither be created nor destroyed in a chemical reaction?
- Law of Conservation of Energy
- Law of Definite Proportions
- Law of Conservation of Mass (correct)
- Law of Multiple Proportions
Who proposed the Law of Definite Proportions in 1799?
Who proposed the Law of Definite Proportions in 1799?
- Michael Faraday
- John Dalton
- Antoine Lavoisier
- Joseph Proust (correct)
What does the Law of Definite Proportions state about the mass of elements in a chemical compound?
What does the Law of Definite Proportions state about the mass of elements in a chemical compound?
- It varies based on the source of the compound
- It changes with different methods of preparation
- It remains the same regardless of the source or method of preparation (correct)
- It is always different for each element in the compound
What does the Law of Conservation of Mass imply about the number of atoms in a chemical reaction?
What does the Law of Conservation of Mass imply about the number of atoms in a chemical reaction?
Which law ensures that chemical compounds have a definite composition?
Which law ensures that chemical compounds have a definite composition?
Who proposed the Law of Conservation of Mass?
Who proposed the Law of Conservation of Mass?
What fundamental concept do the laws of chemical combination provide a foundation for studying?
What fundamental concept do the laws of chemical combination provide a foundation for studying?
Flashcards
Law of Conservation of Mass
Law of Conservation of Mass
Matter is neither created nor destroyed in a chemical reaction.
Law of Definite Proportions
Law of Definite Proportions
A chemical compound always contains the same elements in the same proportions by mass, regardless of the source.
Conservation of Atoms
Conservation of Atoms
The number of atoms remains the same before and after a chemical reaction.
Definite Composition
Definite Composition
Chemical compounds have a fixed and unchanging composition.
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Who proposed the Law of Conservation of Mass?
Who proposed the Law of Conservation of Mass?
Antoine Lavoisier proposed this law.
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Who proposed the Law of Definite Proportions?
Who proposed the Law of Definite Proportions?
Joseph Proust proposed this law in 1799.
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Importance of Chemical Laws
Importance of Chemical Laws
These laws provide a foundation for understanding how substances change and interact.
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Chemistry - Laws of Chemical Combination
The laws of chemical combination govern the interactions between elements and the formation of compounds. These laws help explain how elements react with each other to form various substances. The two main laws of chemical combination are:
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Law of Conservation of Mass: This law, proposed by Antoine Lavoisier in 1789, states that matter can neither be created nor destroyed in a chemical reaction. In other words, the total mass of the reactants is always equal to the total mass of the products formed. This law implies that the number of atoms remains the same before and after a chemical reaction.
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Law of Definite Proportions: Proposed by Joseph Proust in 1799, this law states that a given chemical compound always contains the same elements in the exact same proportions by mass. In other words, the ratio of the mass of the elements in the chemical compounds always remains the same, regardless of the source or method of preparation. This law ensures that chemical compounds have a definite composition.
These laws are essential for understanding how elements react with each other and form various compounds. They provide a foundation for studying chemical reactions and understanding the principles behind them.
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