Question 1
Who was the first chemist to recognize patterns in chemical properties of the elements?
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Mendeleev◦
Newlands◦
Meyer◦
Dobereiner◦
BohrQuestion 2
With regard to the photoelectric effect, which of the following statements is incorrect?
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No electrons are emitted by a given metal below a specific threshold frequency of light.◦
Increasing the intensity of the light sufficiently can cause electrons to be emitted even though the light is below the threshold frequency.◦
For light with a frequency above the threshold frequency, the number of electrons emitted increases with increasing intensity of the light.◦
For light with a frequency above the threshold frequency, the kinetic energy of the emitted electrons increases linearly with the frequency of the light.◦
Albert Einstein won a Nobel Prize for his analysis of the photoelectric effect.
Is the principle of cause and effect unfounded?
Effect of the activation energy barrier.
The Greenhouse Effect
Effect of Atmospheric Stability
Lake Effect Snow
The effect of gene–environment interaction