When small quantities of elemental hydrogen gas are needed for laboratory work, the hydrogen is often generated by chemical reaction of a metal with acid. For example, tine reacts with hydrochloric acid, releasing gaseous elemental hydrogen: :math> Zn ( s ) + 2 HCI ( a q ) → ZnCl 2 ( a q ) + H 2 ( g ) at mass of hydrogen gas is produced when 2.50 g of zinc is reacted with excess aqueous hydrochloride acid?
When small quantities of elemental hydrogen gas are needed for laboratory work, the hydrogen is often generated by chemical reaction of a metal with acid. For example, tine reacts with hydrochloric acid, releasing gaseous elemental hydrogen: :math> Zn ( s ) + 2 HCI ( a q ) → ZnCl 2 ( a q ) + H 2 ( g ) at mass of hydrogen gas is produced when 2.50 g of zinc is reacted with excess aqueous hydrochloride acid?
Solution Summary: The author calculates the mass of hydrogen gas produced from the number of moles of Zn reacting in the reaction.
When small quantities of elemental hydrogen gas are needed for laboratory work, the hydrogen is often generated by chemical reaction of a metal with acid. For example, tine reacts with hydrochloric acid, releasing gaseous elemental hydrogen:
:math>
Zn
(
s
)
+
2
HCI
(
a
q
)
→
ZnCl
2
(
a
q
)
+
H
2
(
g
)
at mass of hydrogen gas is produced when 2.50 g of zinc is reacted with excess aqueous hydrochloride acid?
Definition Definition Transformation of a chemical species into another chemical species. A chemical reaction consists of breaking existing bonds and forming new ones by changing the position of electrons. These reactions are best explained using a chemical equation.
10.
Stereochemistry. Assign R/S stereochemistry for the chiral center indicated on the
following compound. In order to recieve full credit, you MUST SHOW YOUR WORK!
H₂N
CI
OH
CI
カー
11. () Stereochemistry. Draw all possible stereoisomers of the following compound. Assign
R/S configurations for all stereoisomers and indicate the relationship between each as
enantiomer, diastereomer, or meso.
NH2
H
HNH,
-18
b)
8.
Indicate whether the following carbocation rearrangements are likely to occur
Please explain your rational using 10 words or less
not likely to occur
• The double bond is still in the
Same position
+
Likely
to oc
occur
WHY?
-3
H3C
Brave
Chair Conformers. Draw the chair conformer of the following substituted
cyclohexane. Peform a RING FLIP and indicate the most stable
conformation and briefly explain why using 20 words or less.
CI
2
-cobs ??
MUST INDICATE H -2
-2
Br
EQ
Cl
OR
AT
Br
H&
most stable
WHY?
- 4
CH
12
Conformational Analysis. Draw all 6 conformers (one above each letter) of the
compound below looking down the indicated bond. Write the letter of the
conformer with the HIGHEST and LOWEST in energies on the lines provided.
NOTE: Conformer A MUST be the specific conformer of the structure as drawn below
-4 NOT
HOH
OH
3
Conformer A:
Br
OH
A
Samo
Br H
04
Br
H
H3
CH₂
H
anti
stagere
Br CH
clipsed
H
Brott
H
IV
H
MISSING 2
-2
B
C
D
E
F
X
6
Conformer with HIGHEST ENERGY:
13. (1
structure
LOWEST ENERGY:
Nomenclature. a) Give the systematic (IUPAC) name structure. b) Draw the
corresponding to this name. HINT: Do not forget to indicate stereochemistry
when applicable.
a)
८८
2
"Br
{t༐B,gt)-bemn€-nehpརི་ཚ༐lnoa
Parent name (noname)
4 Bromo
Sub = 2-methylethyl-4 Bromo nonane
b) (3R,4S)-3-chloro-4-ethyl-2,7-dimethyloctane
# -2
-2
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