History of atomic theory

History of atomic theory

Bromfield Honors Chemistry

Multiple Choice

Which scientist is credited with being the first to propose that matter is made of atoms?

• Lavoisier
• Aristotle

• Democritus
• Dalton

• Boyle

​Antoine Lavoisier

​"Father of modern chemistry"

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Some major accomplishments:

​*Introduced a quantitative experimental approach

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*Identified hydrogen and oxygen as elements

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Lavosier is credited with stating the Law of Conservation of Mass

The total mass of the reactants is equal to the total mass of the products.

​Lavoisier

​Watch this video about Lavoisier's experiments showing conservation of mass

Multiple Choice

12 grams of carbon react with 32 grams of oxygen to form exactly 44 grams of carbon dioxide. This is a good example of Lavoisier's:

• Law of Definite Proportions

• Atomic Theory

• Law of Conservation of Mass

• Law of Multiple Proportions

Multiple Choice

Scientist credited with developing the Law of Conservation of Mass

• Lavoisier

• Democritus

• Dalton

• Proust

​The Law of Definite Composition

​(aka law of definite proportions)

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​Proposed by Joseph Proust

A pure sample of a compound contains the same ratio of elements by mass, regardless of the source or size of the sample

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​Some text here about the topic of discussion.

​Law of definite composition

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​Examples:

Multiple Choice

Who first proposed the Law of Definite Proportions?

• Democritus

• Proust
• Dalton
• Priestley

​This is how Dalton incorporated Proust's work into his theory

​This law came out of Dalton's own experiments

Multiple Choice

States that, regardless of the amount, a compound is always composed of the same elements in the same proportion by mass

• Law of definite proportions

• Law of conservation of mass

• Law of multiple proportions

• Periodic law

Multiple Choice

Who is credited with stating the "Law of Definite Proportions" ?

• Dalton

• Proust

• Democritus

• Brady

• Lavoisier

Multiple Choice

Which law states that two different compounds can be made from the same two elements (in different proportions)?

• Law of Definite proportions

• Law of multiple proportions

• Law of conservation of mass

• Dalton's Law of Partial Pressures

Multiple Select

Which of the following is NOT a part of Dalton's atomic theory?

• Atoms are made of protons, neutrons and electrons.

• Atoms are always in motion.

• Atoms of the same element are identical.

• Atoms can't be destroyed...merely re-arranged.

• Every element has its own kind of atom.

Multiple Choice

The percentage of copper and oxygen in samples of “CuO” obtained by different methods were found to be the same. This illustrates the law of:

• definite proportions

• conservation of mass

• multiple proportions

• mass action

Multiple Choice

The compounds FeO, Fe₂O₃, and Fe₃O₄ all have been identified. These compounds illustrate the law of ____

• multiple proportions

• definite proportions

• mass action

• conservation of mass

Multiple Choice

Which one of the following statements is NOT part of Dalton's atomic theory?

• Atoms of the same element have the same chemical properties
• Matter is composed of atoms
• Atoms of different elements have different properties
• Atoms change into other atoms in chemical reactions

Multiple Choice

Idea that matter cannot be created nor destroyed

• Rutherford's Rule

• Mendeleev's Mandate

• Law of Conservation of Matter

• The Periodic Law

• Proust's Postulate

Multiple Choice

Although all parts of Dalton's atomic theory are important, which one of the statements is crucial to explain the observations summarized by the Law of Definite Proportions?

• Atoms are very small.
• Atoms of the same elements have the same properties
• Matter is composed of atoms
• Atoms chemically combine with other atoms in fixed, whole-number ratios

Multiple Choice

True or False? John Dalton believed that moving electrons exist in electron clouds around the nucleus. 

• False
• True 

Multiple Choice

The scientist who first claimed that matter was made of small, hard particles called “atomos.”

• Democritis

• Dalton

• Proust

• Einstein

• Mendeleev