Question 1

Which of the following statements best explains why members of the same group in the periodic table have similar chemical properties?

Accepted Answer

They have similar numbers of valence electrons due to periodic repetition of properties.

Question 2

Which equation correctly relates the wavelength $$\lambda$$ and frequency $$v of $$light to its speed $$c$$?

Accepted Answer

$$c = \lambda v$$

Question 3

A neutralization reaction is used in acid-base titration to determine the concentration of an unknown acid. Which of the following best describes what occurs during this reaction?

Accepted Answer

The acid and base react to form water and a salt.

Question 4

Which of the following is true about strong acids and strong bases in water?

Accepted Answer

They completely dissociate in water.

Question 5

In a redox reaction, which species is the oxidizing agent?

Accepted Answer

The species that causes another to lose electrons.

Question 6

Which of the following best describes the difference between energy (light) and matter?

Accepted Answer

Energy is continuous in amount, while matter is discrete in amount.

Question 7

What is the wavelength of light having a frequency of $$7.5 	imes 10$$^{15}$$ Hz? (Use c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$40 pm$$

Question 8

Which color of light will produce electrons with the greatest kinetic energy in the photoelectric effect?

Accepted Answer

Blue

Question 9

Planck’s solution to the blackbody radiation problem involved which of the following assumptions?

Accepted Answer

Energy is quantized and can only be emitted in discrete packets.

Question 10

Which equation did Einstein use to explain the energy of a photon in the photoelectric effect?

Accepted Answer

$$E = hv$$

Question 11

A bright red laser pointer and a dim red laser pointer emit light of the same wavelength and frequency. What is different between the two?

Accepted Answer

The amplitude of the bright pointer is greater, so it emits more energy.

Question 12

Which of the following observations about the photoelectric effect cannot be explained by classical wave theory?

Accepted Answer

Electrons are ejected only if the light frequency exceeds a threshold value.

Question 13

Which of the following best describes constructive interference of waves?

Accepted Answer

Two waves are in phase and their amplitudes add together.

Question 14

Which of the following is a property of alkali metals?

Accepted Answer

They are good reducing agents.

Question 15

Which of the following equations represents the quantization of energy as proposed by Planck?

Accepted Answer

$$E = nhv$$

Question 16

Which of the following statements about blackbody radiation is correct?

Accepted Answer

The wavelength of maximum radiated intensity decreases as temperature increases.

Question 17

Which of the following is the correct relationship for the kinetic energy of electrons ejected in the photoelectric effect?

Accepted Answer

$$E_{	ext{kinetic}} = E_{	ext{photon}} - E_{	ext{threshold}}$$

Question 18

Which of the following best explains the ultraviolet catastrophe?

Accepted Answer

Classical mechanics failed to predict the observed intensity of blackbody radiation at short wavelengths.

Question 19

Which of the following is true about noble gases?

Accepted Answer

They are monatomic and unreactive.

Question 20

A blackbody emits energy according to $$E = nhv. If $$the energy emitted is $$6.0 	imes 10$$^{-7}$$ J and h = 6.626$$ 	imes $$10^{-34} Js$$, what is the frequency of the emitted light if $$n = 1$$?

Accepted Answer

$$9.06 	imes 10$$^{26}$$ Hz

General Chemistry Study Notes: Acids/Bases, Redox, Periodicity, Waves, and Quantum Phenomena

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