Q: Calculate the energy of a photon with a wavelength of $$500 \ \text{nm}$$. ($$h = 6.626 \times 10$$^{-34}$$ \ \text{J} \cdot \text{s}$$, $$c = 3.00 \times 10^8$ \ \text{m/s})$$

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

Question 1

Which of the following statements best describes why gases are highly compressible compared to solids and liquids?

Accepted Answer

Gases have particles that are far apart with lots of empty space between them.

Question 2

A sample of a compound has a mass of 0.0250 kg. Convert this mass to milligrams (mg).

Accepted Answer

$$2.50 	imes 10^4$ mg

Question 3

How many significant figures are in the measurement 0.0045600?

Accepted Answer

6

Question 4

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 5

Which property is a chemical property?

Accepted Answer

Ability to rust

Question 6

A neutral atom of magnesium has an atomic number of 12 and a mass number of 24. How many neutrons does it have?

Accepted Answer

12

Question 7

Which of the following equations correctly relates the energy of a photon to its wavelength?

Accepted Answer

$$E = \dfrac{hc}{\lambda}$$

Question 8

Which of the following sets of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$$n = 2, \ l = 2, \ m_l = 0, \ m_s = +\dfrac{1}{2}$$

Question 9

Which of the following best explains why the photoelectric effect was puzzling to scientists before Einstein's explanation?

Accepted Answer

Electrons were only ejected when the light's frequency was above a certain threshold, regardless of intensity.

Question 10

Calculate the energy of a photon with a wavelength of $$500 \ 	ext{nm}$$. ($$h = 6.626 	imes 10$$^{-34}$$ \ 	ext{J} \cdot 	ext{s}$$, $$c = 3.00 	imes 10^8$ \ 	ext{m/s})$$

Accepted Answer

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

Question 11

Which of the following statements about the relationship between energy, frequency, and wavelength is correct?

Accepted Answer

As frequency increases, energy increases.

Question 12

Which element has the following ground state electron configuration: $$[	ext{Ne}] \ 3s^2$ \ 3p^4$?

Accepted Answer

Sulfur (S)

Question 13

A sample contains $$3.01 	imes 10$$^{23}$$ atoms of carbon. How many moles of carbon are present?

Accepted Answer

$$0.500$$ mol

Question 14

Which of the following best describes the difference between emission and absorption of light by an atom?

Accepted Answer

Emission occurs when an electron falls to a lower energy level; absorption occurs when it jumps to a higher energy level.

Question 15

Which of the following is the correct noble gas shorthand electron configuration for calcium (Ca)?

Accepted Answer

$$[	ext{Ar}] \ 4s^2$

Question 16

Which of the following best explains why we do not observe the matter waves of a baseball?

Accepted Answer

The baseball's mass is too large, resulting in a wavelength that is too small to detect.

Question 17

Which of the following is the correct order of electromagnetic radiation from lowest to highest energy?

Accepted Answer

Radio waves, microwaves, infrared, visible, ultraviolet, X-rays, gamma rays

Question 18

Which quantum number determines the shape of an orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 19

A chlorine atom gains one electron to become a chloride ion. Which of the following statements is true?

Accepted Answer

The chloride ion has more electrons than protons.

General Chemistry Essentials: Units, Atomic Structure, Quantum Theory, and Electron Configuration

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