Q: A photon has a frequency of $$6.0 \times 10$$^{14}$$\ \mathrm{s}^{-1}. $$What is its energy in joules? (Planck's constant $$h = 6.63 \times 10$$^{-34}$$\ \mathrm{J \cdot s})$$

$$3.98 \times 10$$^{-19}$$\ \mathrm{J}$$

Q: Calculate the wavelength ($$\lambda) of an $$electron moving at $$2.5 \times 10^6$\ \mathrm{m/s} if $$its mass is $$9.11 \times 10$$^{-31}$$\ \mathrm{kg}. ($$Planck's constant $$h = 6.63 \times 10$$^{-34}$$\ \mathrm{J \cdot s})$$

$$2.91 \times 10$$^{-10}$$\ \mathrm{m}$$

Q: If the wavelength of light is $$500\ \mathrm{nm}$$, what is its frequency? (Speed of light $$c = 3.00 \times 10^8$\ \mathrm{m/s})$$

$$6.00 \times 10$$^{14}$$\ \mathrm{s}^{-1}$$

Question 1

Which equation correctly relates the speed of light ($$c$$), wavelength ($$\lambda$$), and frequency ($$
u) of $$electromagnetic radiation?

Accepted Answer

$$c = \lambda 
u$$

Question 2

A photon has a frequency of $$6.0 	imes 10$$^{14}$$\ \mathrm{s}^{-1}. $$What is its energy in joules? (Planck's constant $$h = 6.63 	imes 10$$^{-34}$$\ \mathrm{J \cdot s})$$

Accepted Answer

$$3.98 	imes 10$$^{-19}$$\ \mathrm{J}$$

Question 3

Which of the following best describes the Heisenberg uncertainty principle?

Accepted Answer

The uncertainty in position ($$\Delta x) $$and momentum ($$\Delta (mv)) of an $$object cannot both be zero; their product is at least $$h/4\pi.$$

Question 4

Calculate the wavelength ($$\lambda) of an $$electron moving at $$2.5 	imes 10^6$\ \mathrm{m/s} if $$its mass is $$9.11 	imes 10$$^{-31}$$\ \mathrm{kg}. ($$Planck's constant $$h = 6.63 	imes 10$$^{-34}$$\ \mathrm{J \cdot s})$$

Accepted Answer

$$2.91 	imes 10$$^{-10}$$\ \mathrm{m}$$

Question 5

Which of the following elements is least likely to form covalent bonds?

Accepted Answer

Potassium

Question 6

What is the electron configuration for phosphorus (atomic number 15)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^3$$

Question 7

How many valence electrons does a nitrogen atom possess?

Accepted Answer

5

Question 8

Which equation is used to calculate the energy of a photon given its frequency?

Accepted Answer

$$E = h 
u$$

Question 9

A sodium atom has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^1. $$How many valence electrons does it have?

Accepted Answer

1

Question 10

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have a full outer shell of electrons, making them stable.

Question 11

Which of the following is the correct Lewis symbol for a nitrogen atom?

Accepted Answer

$$N$$ with 5 dots around it

Question 12

Which of the following equations represents the de Broglie wavelength of a particle?

Accepted Answer

$$\lambda = h / mv$$

Question 13

If the wavelength of light is $$500\ \mathrm{nm}$$, what is its frequency? (Speed of light $$c = 3.00 	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$6.00 	imes 10$$^{14}$$\ \mathrm{s}^{-1}$$

Question 14

Which of the following statements about valence electrons is correct?

Accepted Answer

Valence electrons are the electrons in the outermost shell of an atom.

Question 15

Which atom is most likely to lose one electron to achieve a noble gas configuration?

Accepted Answer

Potassium

Question 16

Which of the following best describes the relationship between wavelength and frequency for electromagnetic radiation?

Accepted Answer

As wavelength increases, frequency decreases.

Question 17

Which of the following is a correct statement about the periodic table?

Accepted Answer

Elements in the same group have the same number of valence electrons.

Question 18

Which of the following is the correct electron configuration for a calcium ion ($$\mathrm{Ca}^{2+}$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^6$$

Question 19

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their valence shell.

General Chemistry Study Guide: Atomic Structure, Electron Configuration, and Light

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