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Questions and Answers
According to Dalton's atomic theory, what was considered the smallest indivisible constituent of all matter?
According to Dalton's atomic theory, what was considered the smallest indivisible constituent of all matter?
atom
What are the three subatomic particles that make up an atom?
What are the three subatomic particles that make up an atom?
electrons, protons, neutrons
What are the charges of electrons, protons, and neutrons?
What are the charges of electrons, protons, and neutrons?
electrons - negatively charged, protons - positively charged, neutrons - uncharged
Which laws could Dalton's atomic theory explain?
Which laws could Dalton's atomic theory explain?
What did experiments towards the end of the nineteenth century reveal about Dalton's atomic theory?
What did experiments towards the end of the nineteenth century reveal about Dalton's atomic theory?
What did Dalton's atomic theory propose about the nature of the atom?
What did Dalton's atomic theory propose about the nature of the atom?
What were the three laws that Dalton's theory could explain?
What were the three laws that Dalton's theory could explain?
What were the smaller particles that experiments towards the end of the nineteenth century revealed the atom to be composed of?
What were the smaller particles that experiments towards the end of the nineteenth century revealed the atom to be composed of?
What are the charges of electrons, protons, and neutrons?
What are the charges of electrons, protons, and neutrons?
How did the discoveries towards the end of the nineteenth century challenge Dalton's atomic theory?
How did the discoveries towards the end of the nineteenth century challenge Dalton's atomic theory?
Flashcards
Dalton's atomic theory
Dalton's atomic theory
Dalton's atomic theory stated that the atom is the smallest indivisible part of matter.
Atom (indivisible)
Atom (indivisible)
The smallest unit of matter.
Subatomic particles
Subatomic particles
Tiny particles even smaller than an atom.
Electron charge
Electron charge
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Proton charge
Proton charge
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Neutron charge
Neutron charge
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Law of conservation of mass
Law of conservation of mass
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Law of constant composition
Law of constant composition
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Law of multiple proportions
Law of multiple proportions
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Late 19th Century discoveries
Late 19th Century discoveries
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Study Notes
Dalton's Atomic Theory
- Proposed in 1803, asserting that atoms are the smallest indivisible constituents of matter.
- Explained three fundamental laws:
- Law of Conservation of Mass - Mass is neither created nor destroyed in chemical reactions.
- Law of Constant Composition - A given compound always contains the same proportion of elements by mass.
- Law of Multiple Proportions - Different compounds can be formed from the same elements in different ratios.
Advancements in Atomic Understanding
- End of the 19th century saw experiments that challenged Dalton’s assertions.
- Discovery of subatomic particles revealed that atoms are not the smallest units of matter.
- Atoms consist of smaller particles: electrons, protons, and neutrons.
Subatomic Particles
- Electrons:
- Negatively charged.
- Involved in chemical bonding and reactions.
- Protons:
- Positively charged.
- Present in the nucleus and determine the atomic number.
- Neutrons:
- Have no charge (neutral).
- Also found in the nucleus, contributing to atomic mass.
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Description
Test your knowledge of Dalton's atomic theory and its limitations with this quiz! Explore the historical context and the experimental evidence that led to the development of modern atomic theory.
