12 Questions
Who is credited with proposing the modern atomic theory?
John Dalton
What is the law of conservation of matter stating?
The total mass of the products must equal the total mass of the reactants.
What is the result when 10 grams of (\ce{CaCO3}) is heated?
4.4 g of (\ce{CO2}) and 5.6 g of (\ce{CaO})
What happens to the matter when wood burns?
It changes into ashes, carbon dioxide and water vapor.
What is the significance of the law of conservation of mass in a campfire?
It demonstrates that the same amount of matter exists before and after the campfire.
What is the major contribution of A.Lavoisier to the field of chemistry?
Describing the laws of chemical combination.
What is the central idea expressed in the concept of 'nothing comes from nothing'?
Matter cannot be created or destroyed, only transformed
What is the percentage of oxygen in a sample of pure water by mass?
88.8%
What is the main idea behind the Law of Conservation of Matter?
The amount of matter in a system remains constant
What is true about the Law of Definite Proportions?
It states that elements are always combined in the same proportions by mass
What is an example of a substance that can be made from hydrogen and oxygen, besides water?
Hydrogen peroxide
What is not true about the Law of Definite Proportions?
Samples with the same mass ratio are always the same substance
Learn about the development of chemical reactions, the laws of chemical combination, and the contributions of A. Lavoisier and John Dalton to the modern atomic theory. Understand how these scientists laid the foundation for our understanding of matter and its reactions.
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