Exam (elaborations)
Chem 231 Questions And Answers Latest Update
- Course
- CHEM 231
- Institution
- University Of Illinois - Urbana-Champaign
Chem 231 Questions And Answers Latest Update
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Solution 2024/2025Pepper
Chem 231 Questions And Answers Latest
Update
When are the prefixes mono-, di-, tri-, etc. used to name a compound?
ANS✔✔ Only when naming covalent compounds
When are roman numerals used to name a compound? ANS✔✔ Only when
naming ionic compounds containing transition and post-transition metals
Consider a compound containing 3 carbon atoms per molecule. The molar
mass of the compound is 167.9 g/mol. What is the mass percent C? ANS✔✔
21.5
When drawing the Lewis representation of a single fluorine (F) atom, how
many dots would be drawn? ANS✔✔ 7
Which of the following (there may be more than one correct answer) follow
the octet rule? ANS✔✔ N, C, O, F
Which of the following have the electron configuration 1s22s22p63s23p6
(mark all that apply)? ANS✔✔ S2−
Cl−
P3−
Order the following from smallest atomic radius to largest (1 = smallest; 5 =
largest). ANS✔✔ F<N<Li<Br<Se
, Solution 2024/2025
Pepper
Which of the following atoms are diamagnetic (mark all that apply)? ANS✔✔
Be, Ne, Cd
Effective nuclear charge reflects the fact that... ANS✔✔ core electrons shield
the valence electrons from some of the positive charge of the nucleus.
Which of the following statements correctly explains why oxygen's first
ionization energy is smaller than nitrogens? ANS✔✔ because two of
oxygen's four 2p electrons are paired, causing electron repulsion, making it
easier than expected to pull off the first electron
If you measure out 1,686.1 g of PbCl2, how many moles of the substance do
you have? ANS✔✔ 6.063
A photon hits a detector of an air quality sensor. If the energy of a photon is
8.50 x 10-19 J, what is the wavelength of the photon, in nanometers?
ANS✔✔ ((6.63*10^-34)(3*10^8))/(8.50*10^-19) = 2.34*10^-7
> (2.34*10^-7) / (10^-9) = 234
= 234 nm
What's the maximum amount of electrons in an atom that could have n=4
and l=2? ANS✔✔ 10
The following successive ionization energies belong to a fictitious element.
How many valence electrons does this element have? ANS✔✔ [ Basically
where you see the biggest jump in kJ/mol is how many valence electron the
element has.
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