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Foundations of Chemical Reactions

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Questions and Answers

Who is credited with proposing the modern atomic theory?

A.Lavoisier

John Dalton (correct)

Proust

None of the above

What is the law of conservation of matter stating?

The total mass of the reactants is greater than the total mass of the products.

The total mass of the reactants is less than the total mass of the products.

The total mass of the products is greater than the total mass of the reactants.

The total mass of the products must equal the total mass of the reactants. (correct)

What is the result when 10 grams of (\ce{CaCO3}) is heated?

4.4 g of \(\ce{CO2}\) and 5.6 g of \(\ce{CaO}\) (correct)

8.8 g of \(\ce{CO2}\) and 9.9 g of \(\ce{CaO}\)

6.6 g of \(\ce{CO2}\) and 7.7 g of \(\ce{CaO}\)

2.2 g of \(\ce{CO2}\) and 3.3 g of \(\ce{CaO}\)

What happens to the matter when wood burns?

It changes into ashes, carbon dioxide and water vapor. Signup and view all the answers

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. Signup and view all the answers

What is the major contribution of A.Lavoisier to the field of chemistry?

Describing the laws of chemical combination. Signup and view all the answers

What is the central idea expressed in the concept of 'nothing comes from nothing'?

Matter cannot be created or destroyed, only transformed Signup and view all the answers

What is the percentage of oxygen in a sample of pure water by mass?

88.8% Signup and view all the answers

What is the main idea behind the Law of Conservation of Matter?

The amount of matter in a system remains constant Signup and view all the answers

What is true about the Law of Definite Proportions?

It states that elements are always combined in the same proportions by mass Signup and view all the answers

What is an example of a substance that can be made from hydrogen and oxygen, besides water?

Hydrogen peroxide Signup and view all the answers

What is not true about the Law of Definite Proportions?

Samples with the same mass ratio are always the same substance Signup and view all the answers