You have an irregularly shaped piece of an unknown metal. To identify it, you determine its density and then compare this value with known values that you look up in the chemistry library. The mass of the metal is 74.122 g. Because of the irregular shape, you measure the volume by submerging the metal in water in a graduated cylinder. When you do this, the water level in the cylinder rises from 28.2 mL to 36.7 mL. (a) What is the density of the metal? (Use the correct number of significant figures in your answer.) (b) The unknown is one of the seven metals listed below. Isis possible to identify the metal based on the density you have calculated? Explain.
You have an irregularly shaped piece of an unknown metal. To identify it, you determine its density and then compare this value with known values that you look up in the chemistry library. The mass of the metal is 74.122 g. Because of the irregular shape, you measure the volume by submerging the metal in water in a graduated cylinder. When you do this, the water level in the cylinder rises from 28.2 mL to 36.7 mL. (a) What is the density of the metal? (Use the correct number of significant figures in your answer.) (b) The unknown is one of the seven metals listed below. Isis possible to identify the metal based on the density you have calculated? Explain.
You have an irregularly shaped piece of an unknown metal. To identify it, you determine its density and then compare this value with known values that you look up in the chemistry library. The mass of the metal is 74.122 g. Because of the irregular shape, you measure the volume by submerging the metal in water in a graduated cylinder. When you do this, the water level in the cylinder rises from 28.2 mL to 36.7 mL.
(a) What is the density of the metal? (Use the correct number of significant figures in your answer.)
(b) The unknown is one of the seven metals listed below. Isis possible to identify the metal based on the density you have calculated? Explain.
6. Match each of the lettered items in the column on
the left with the most appropriate numbered
item(s) in the column on the right. Some of the
numbered items may be used more than once
and some not at all.
a.
Z = 37
1.
b.
Mn
2.
C.
Pr
element in period 5 and group
14
element in period 5 and group
15
d. S
e. [Rn] 7s¹
f.
d block
metal
3. highest metallic character of all
the elements
4. paramagnetic with 5 unpaired
electrons
5. 4f36s2
6. isoelectronic with Ca²+ cation
7.
an alkaline metal
8. an f-block element
Draw all formal charges on the structures below as is and draw 1 resonance structure that is more stable.
Part II. xiao isolated a compound TAD (Ca H 10 N₂) from tobacco and obtained its IR spectrum. Xiao proposed
a chemical structure shown below:
% Transmittance
4000
3500
3000
2500 2000
Wavenumber (cm-1)
1500
1000
(a) Explain why her proposed structure is inconsistent with the IR spectrum obtained
(b) TAD exists as a tautomer of the structure xiao proposed. Draw the structure
and explain why it is more compatible with the obtained spectrum.
(C) what is the possible source for the fairly intense signal at
1621cm1
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