Mod J Unit 1 Lesson 2 - Atoms and Elements

Which of the following is a characteristic of durable scientific knowledge? (2.01)

• It remains unchanged over time.

• It is rarely subjected to examination.

• Several scientists' investigations support it.

• Similar investigations yield dissimilar results.

Which of the following provides evidence to support Rutherford's model of the atomic nucleus? (2.01)

• Gold foil experiment

• Plum pudding model

• Spectrum of colors emitted by gas

• Radiation produced when alpha particles hit beryllium

Which of the following observations indicates that atoms of all elements contain small, negatively charged particles? (2.01)

• Alpha particles are repelled by cathode rays of elements.

• Cathode rays are deflected towards a positively charged rod.

• A particular frequency of light is produced by a gas in an excited state.

• Certain areas of the atom called orbitals contain all the charged particles.

The table shows the charge on three unknown subatomic particles.

Which particle is most likely present in the space outside of the nucleus of the atom? (2.01)

• Only particle X

• Only particle Z

• Both particles X and Y

• Both particles Y and Z

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The table shows the number of charged particles in an ion.

A negatively charged substance is brought near the ion. What will most likely happen and why? (2.01)

• The ion will repel the substance because it has more electrons than protons.

• The ion will repel the substance because it has more protons than electrons.

• The ion will attract the substance because it has more electrons than protons.

• The ion will attract the substance because it has more protons than electrons.

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What is the lowest point of a wave called? (2.02)

• Amplitude

• Crest

• Frequency

• Trough

What is the highest point of a wave called? (2.02)

• Amplitude

• Crest

• Frequency

• Trough

Which of the following methods can be used to identify the suspected use of heat lamps in a house without entering the house? (2.02)

• Identify the lamps inside the house using x−ray machines.

• Detect the heat emitted by the lamps using infrared rays.

• Use special cameras to emit ultraviolet light that can detect the heat lamps.

• Capture the images of lamps inside the house using radars that send radio wave signals.

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What term is used to describe the lowest energy level of a particle? (2.03)

• Photon

• Excited state

• Ground state

• Emission spectrum

An electron moved from a higher energy level to a lower energy level. What most likely happened during the transition? (2.03)

• A photon was released.

• A photon was absorbed.

• A fixed amount of energy was absorbed.

• A random amount of energy was released.

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