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Dalton's atomic theory states that atoms are indivisible and indestructible particles, and that chemical reactions involve only the rearrangement of atoms. The postulate that directly explains the law of conservation of…
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Explain the significance of the postulate 'atoms are neither created nor destroyed' in chemical equations and stoichiometry.
It ensures balancing of equations and mass conservation in calculations.
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State and explain the postulate of Dalton's theory that is the basis of the law of conservation of mass, with an example.
Atoms are neither created nor destroyed; e.g., burning magnesium: 2Mg + O2 → 2MgO, mass of MgO equals mass of Mg plus O2.
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Discuss how Dalton's atomic theory explains the law of conservation of mass and the law of definite proportions.
Conservation: atoms indestructible; definite proportions: atoms combine in fixed ratios.
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In a chemical reaction, 10 g of calcium carbonate decomposes to give 5.6 g of calcium oxide and 4.4 g of carbon dioxide. Show that this obeys the law of conservation of mass. Which postulate of Dalton's theory is applicable?
Total mass of products = 5.6 + 4.4 = 10 g = mass of reactant; applicable postulate: atoms are neither created nor destroyed.
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Explain how Dalton's postulate about atoms being indestructible leads to the law of conservation of mass.
If atoms are indestructible, then in any reaction the same atoms are present before and after, so total mass is conserved.
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Differentiate between the law of conservation of mass and the law of definite proportions.
Conservation of mass deals with total mass in a reaction; definite proportions deals with fixed mass ratios in a compound.
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Why does the law of conservation of mass hold true in chemical reactions?
Because atoms are neither created nor destroyed, only rearranged, so total mass remains constant.
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A reaction between hydrogen and oxygen produces water. If 4 g of hydrogen reacts with 32 g of oxygen, what mass of water is formed? Which postulate of Dalton's theory supports this?
36 g of water; supported by the postulate that atoms are neither created nor destroyed.
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State the postulate of Dalton's atomic theory that explains the law of conservation of mass.
Atoms are neither created nor destroyed in a chemical reaction.
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State the postulate of Dalton's theory that explains the law of multiple proportions.
When two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other are in a ratio of small whole numbers.
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Define the law of conservation of mass.
Mass is neither created nor destroyed in a chemical reaction; total mass of reactants equals total mass of products.
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What does Dalton's theory say about the nature of atoms?
Atoms are indivisible and indestructible particles.
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In a chemical reaction, what happens to atoms according to Dalton's theory?
Atoms are rearranged, not created or destroyed.
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Which postulate of Dalton's theory is directly related to the law of definite proportions?
Atoms combine in simple whole-number ratios to form compounds.
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