FREE MCAT AND STUDY GAMES ABOUT GEN CHEM

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FREE MCAT AND STUDY GAMES ABOUT GEN CHEM

CHAPTER 1 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -59 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: What is the Aufbau Principle

Answer:

Orbitals are filled in order of lowest energy to highest energy. The order of low energy orbitals to high energy orbitals can be determined using the diagonal method shown below. An electron not in its lowest energy orbital is called excited and will shor

Question 2: Where are protons located

Answer:

In the nucleus

Question 3: What is an electron configuration

Answer:

An electron configuration is a shorthand accounting of the electrons in an atom using s,p,d,f notation.

Question 4: What are the possible values of Magnetic quantum number

Answer:

-l to +l

Question 5: What does the principle quantum number represent

Answer:

The energy level in which the electron resides.Question 6: As principle energy level goes up, the electron's radius from the nucleus [...].

Answer:

As principle energy level goes up, the electron's radius from the nucleus increases.

Question 7: Which is the first quantum number

Answer:

The principal quantum number, n.

Question 8: What is an isotope

Answer:

An isotope is an atom that shares an atomic number (number of protons) with another atom but has a different mass number by virtue of having more/less neutrons.

Question 9: How do you determine the number of valence electrons an atom has

Answer:

Look at the periodic table and determine which column the atom is in. (the numbers above the periodic table are the number of valence electrons. The noble gases can be thought of as having 0 valence electrons or 8 valence electrons.)

Question 10: Which is the fourth quantum number

Answer:

The spin quantum number, ms

Question 11: What is the speed of light in air equal to

Answer:

3.00*108 m/s

Question 12: What is an atomic emission spectrum

Answer:

An atomic emission spectrum is a cataloguing of all the electron transitions an atom can undergo and the photons those transitions release. Remember, the distances between energy levels are different in every atom. Therefore, the photons released when an

Question 13: What is the Planck Relation

Answer:

Where E is equal to the energy in Joules. f is equal to the frequency in Hz and h is the Planck's constant.

Question 14: What is an absorption spectrum

Answer:

An absorption spectrum is like the atomic emission spectrum, only instead of cataloguing the photons that are emitted when excited electrons fall, absorption spectra catalogue the photons that are absorbed when ground state electrons are promoted to excit Question 15: What is the number following the element name when describing an isotope

Answer:

The mass number. For example. Carbon-12 has a mass number of 12.

Question 16: Which is the second quantum number

Answer:

Azimuthal (angular momentum) number, l.

Question 17: What is the purpose of the four quantum numbers

Answer:

The four quantum numbers exist so we can quickly and easily describe every electron's position in the atom. For example, if I assign the quantum numbers 2, 0,0,1/2, I know exactly which electron I am

talking about: the electron in the second energy level,

Question 18: What is Planck's constant equal to with units

Answer:

6.626*10-34 J*s Question 19: How do you calculate the atomic weight of an atom with two naturally occurring isotopes

Answer:

A*X + B*Y = Atomic Weight A is equal to the mass number of the first isotope. X is equal to the percentage prevelance of that first isotope. B is equal to the mass number of the second isotope. Y is equal to the percentage prevelance of that second isotop

Question 20: Where are electrons located

Answer:

In the orbitals surrounding an atom's nucleus.

Question 21: What does it mean for an atom to be in an excited state

Answer:

An atom is excited when one of its electrons is in a higher energy shell than it would normally be.

Question 22: When you lose an electron you have a [...] charge

Answer:

When you lose an electron you have a positive charge

Question 23: How much mass does an electron add to an atom

Answer:

About 1/2000th of a proton. Essentially the mass of an electron is negligible in its contribution to the mass of an atom.

Question 24: When you gain an electron you have a [...] charge

Answer:

When you gain an electron you have a negative charge

Question 25: What are the possible values of ms

Answer:

+1/2 if the electron is spinning up and -1/2 if the electron is spinning down.

Question 26: What are the possible values for n

Answer:

Any positive integer to infinity (whole number other than 0).

Question 27: What is an energy shell

Answer:

Energy shells are different distances at which electrons can orbit a nucleus with stability. The more energy an electron has, the further out they go.