Download Chem 121 QU 78 Due in lecture

Chem 121 QU 78 Due in lecture Name__________________________________________ page 1/2
DIRECTIONS: Write the correct answers in the appropriate blanks. Round – off answers (but not
data) to 3 significant figures. Write units. Text: CHEMISTRY A molecular approach (2nd Ed.) by
Tro.
c= 3.00 X 108 m/s
h = 6.63 X 10-34 j-s
1.00 m = 1.0 X 109 nm
1. Answer the next 4 questions concerning an Xray laser with a frequency of 5.13 X 1017 hz.
→___________________________ Calculate the wavelength in nm.
→____________________________ Calculate the energy of the Xray photon.
[ yes
no ]← Is this radiation visible without special equipment? Circle the correct answer.
See text page 281.
→______________________________ Calculate the number of photons needed to raise the temperature of
125g of water ( c= 4.18j/g-Co) from 25oC to 100oC. Use scientific notation.
2. Solve the following problems from the text pages 310-313:
→___________________________________________________________ 29
s orbitals↓
px and py orbitals↓
→
← 34. Label and use the x and y axes.
→Lowest freq. ____________
___________ ____________
40(frequency)↑
→__________________________________ 42a
___________ Highest freq.
→________________________________48b
3. → Answer the next 3 questions concerning Cl- (#17).
Draw the orbital pattern and circle the valence electrons:
→
1s
2s
2p
3s
3p
3d
→__________________________________________________________________________
Write the electron configuration diagram on the above blank↑
→ n = _______
l = _______
Write the 2 quantum numbers for an electron indicated by the above arrow.
Chem 121 QU 78 Due in lecture:
Name_____________________________________ page 2/2
4. → Answer the next 3 questions concerning Mn(#25).
Draw the orbital pattern and circle the valence electrons:
→
1s
2s
2p
3s
3p
3d
4s
4p
→__________________________________________________________________________
Write the electron configuration diagram on the above blank↑
→ n = _______
l = _______
Write the 2 quantum numbers for an electron indicated by the above arrow.
5. Solve the following problems from the text pages 353-357:
→_________________________________________________________________ 10
What is Coulomb’s law↑?
→_________________________________________________________________ 18
What are valence electrons?↑
→_________________________________________________________________ 34a
Compare cation and atomic radii. ↑
→__________________________________________________________________ 36
What is the general trend of ionization energy going down a column ? ↑
→__________________________________________________________________42b
Write a balanced equation showing the reaction between a halogen and hydrogen.↑
→____________ 54c ←Write the number of valence electrons.
6. Rank order the following atoms (Al, Y, Sc, C, Ne) from smallest to largest atomic radius:
→Smallest ________
________
________
________
________ Largest
7. Rank order the following atoms (P, Rb, N, In, Al) from largest to smallest ionization energy:
→Largest ________
________
________
________
________ Smallest
8. →__________ Write the chemical symbol of an element whose atom is larger than the corresponding
ion.