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PA SSAGE-III: According to Dalton's atom...

PA SSAGE-III: According to Dalton's atomic theory, all matter whether an element, a compound or a mixture is composed of small particles called atoms which can neither be created nor destroyed during a chemical reaction. Dalton's theory provides a simple explanation for the laws of chemical combination. He used his theory to explain law of conservation of masses, law of constant proportions and law of multiple proportions, based on various postulates of the theory. Dalton was the first scientist to use the symbols for the elements in a very specific sense. When he used a symbol for an element he also meant a definite quantity of that element, that is one atom of that element.
"If 100 g of calcium carbonate (whether in the form of marble or chalk) are decomposed, 56 g of calcium oxide and 44 g of carbon dioxide are formed." Which law of chemical combination is illustrated by this statement?

A

Law of constant proportions

B

Law of conservation of mass

C

Law of multiple proportions

D

Law of conservation of energy

Text Solution

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The correct Answer is:
To determine which law of chemical combination is illustrated by the statement regarding the decomposition of calcium carbonate, we can follow these steps: ### Step 1: Understand the Reaction The decomposition of calcium carbonate (CaCO₃) can be represented by the following chemical equation: \[ \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 \] ### Step 2: Analyze the Masses According to the statement, when 100 g of calcium carbonate is decomposed, it produces: - 56 g of calcium oxide (CaO) - 44 g of carbon dioxide (CO₂) ### Step 3: Apply the Law of Conservation of Mass The Law of Conservation of Mass states that in a chemical reaction, the mass of the reactants must equal the mass of the products. In this case: - Mass of reactants (CaCO₃) = 100 g - Mass of products (CaO + CO₂) = 56 g + 44 g = 100 g ### Step 4: Conclusion Since the mass of the reactants (100 g) is equal to the mass of the products (100 g), this illustrates the Law of Conservation of Mass. ### Final Answer The law of chemical combination illustrated by the statement is the **Law of Conservation of Mass**. ---
To determine which law of chemical combination is illustrated by the statement regarding the decomposition of calcium carbonate, we can follow these steps: ### Step 1: Understand the Reaction The decomposition of calcium carbonate (CaCO₃) can be represented by the following chemical equation: \[ \text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2 \] ### Step 2: Analyze the Masses According to the statement, when 100 g of calcium carbonate is decomposed, it produces: ...
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According to Dalton's atomic theory, all matter whether an element, a compound or a mixture is composed of small particles called atoms which can neither be created nor destroyed during a chemical reaction. Dalton's theory provides a simple explanation for the laws of chemical combination. He used his theory to explain law of conservation of masses, law of constant proportions and law of multiple proportions, based on various postulates of the theory. Dalton was the first scientist to use the symbols for the elements in a very specific sense. When he used a symbol for an element he also meant a definite quantity of that element, that is one atom of that element. Which postulate of Dalton's atomic theory explains law of definite proportions?

According to Dalton's atomic theory, all matter whether an element, a compound or a mixture is composed of small particles called atoms which can neither be created nor destroyed during a chemical reaction. Dalton's theory provides a simple explanation for the laws of chemical combination. He used his theory to explain law of conservation of masses, law of constant proportions and law of multiple proportions, based on various postulates of the theory. Dalton was the first scientist to use the symbols for the elements in a very specific sense. When he used a symbol for an element he also meant a definite quantity of that element, that is one atom of that element. Which postulate of Dalton's atomic theory is the result of the law of conservation of mass?

Dalton's Atomic Theory