Atomic Theory Quiz

What does atomic theory posit about all matter?

• All matter is made up of tiny particles called molecules.

• All matter is made up of tiny particles called atoms.

• All matter is made up of tiny particles called cells.

• All matter is made up of tiny particles called compounds.

Answer explanation

Atomic theory states that all matter is composed of tiny particles called atoms, which are the fundamental building blocks of matter. The other options, such as molecules, cells, and compounds, are not the basic units of matter.

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NGSS.HS-PS1-7

What happens to atoms during chemical reactions?

• Atoms are created.

• Atoms are destroyed.

• Atoms are rearranged.

• Atoms remain unchanged.

Answer explanation

During chemical reactions, atoms are not created or destroyed; instead, they are rearranged to form new substances. This means the bonds between atoms break and new bonds form, leading to different molecular structures.

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NGSS.HS-PS1-7

What model did J.J. Thompson propose for the atom?

• Solar System Model

• Plum Pudding Model

• Quantum Mechanical Model

• Bohr Model

Answer explanation

J.J. Thompson proposed the Plum Pudding Model, which depicted the atom as a sphere of positive charge with negatively charged electrons embedded within it, resembling a plum pudding.

What ratio did J.J. Thompson determine for the electron?

• Electron Charge - Mass Ratio

• Electron Spin - Mass Ratio

• Electron Charge - Spin Ratio

• Electron Mass - Volume Ratio

Answer explanation

J.J. Thompson determined the electron charge-to-mass ratio, which is a fundamental property of the electron. This ratio is crucial for understanding the behavior of electrons in electric and magnetic fields.

Who conducted the Gold Foil Experiment in 1911?

• Niels Bohr

• J.J. Thomson

• Ernest Rutherford

• James Chadwick

Answer explanation

The Gold Foil Experiment, conducted by Ernest Rutherford in 1911, demonstrated that atoms have a small, dense nucleus, challenging the existing plum pudding model proposed by J.J. Thomson.

What is the Bohr Model also known as?

• Quantum Model

• Rutherford Model

• New Atomic Model

• Classical Model

Answer explanation

The Bohr Model is also known as the New Atomic Model because it introduced a new way of understanding atomic structure, incorporating quantized energy levels for electrons, which was a significant advancement over previous models.

Which of the following statements is true according to Heisenberg's Uncertainty Principle?

• Only the position of an electron can be known at any given time.

• Only the momentum of an electron can be known at any given time.

• Both position and momentum of an electron can be known at any given time.

• Either position or momentum of an electron can be known at any given time, but not both.

Answer explanation

Heisenberg's Uncertainty Principle states that the more precisely the position of a particle is known, the less precisely its momentum can be known, and vice versa. Thus, either position or momentum can be known, but not both.

Which Scientist Theorized Quantized Energy Levels in Their Atomic Model?

• Thompson

• Rutherford

• Bohr

• Heisenberg

Answer explanation

Niels Bohr theorized quantized energy levels in his atomic model, proposing that electrons orbit the nucleus at specific distances, leading to distinct energy levels. This was a significant advancement in atomic theory.

Which subatomic particle did J.J. Thomson discover?

• Photon

• Proton

• Neutron

• Electron

According to Dalton's Atomic Theory, which of the following is true?

• Atoms of the same element are identical in mass and properties.

• Atoms can be divided into smaller particles.

• Atoms can be created or destroyed in chemical reactions.

• Atoms are made up of protons and neutrons only.

Tags

NGSS.HS-PS1-7