High School Department
159TH
EXAMINATION
CHEMISTRY, part I
Wednesday, June 14, 1899-9.15
a. m. to
12.15
p. m., only
Answer JO questions but no more.
1]' more than JO are answered only
tho first 10 answers will be conszdered. Each complete answer will
receive JO credits. Papers entitled to 75 or more credits will be accepted.
I Give the name and chemical symbol of each of five constituents of air and state approximately the proportion of each.
2 What is (a) kindling
temperature, (b) combustion?
the conditions necessary for combustion.
<
3 Write two reactions for preparing hydrogen.
physical and chemical properties of hydrogen.
• State
State the
4 Describe (a) a process for the analysis of water, (b) a process for the synthesis of water. Write the reactions for each
process.
5 Describe the preparation of water gas, writing the reaction. Why is this gas dangerous?
6 Describe two' experiments
nitrogen compounds.
illustrating
the instability
of
7 Explain in detail SOffiecommercial process of bleaching.
8 Describe an experiment for preparing hydrochloric acid'
from its constituent elements, noting necessary precautions.
9 Describe the process of etching on glass.
10 Describe an experiment
tralization, writing reactions.
illustrating
the process of neu-
II
Describe the preparation of CaO, writing the reaction.
Mention two important uses of CaO.
12 Describe the manufacture
on a commercial scale of sulfuric acid, writing reactions.
13 Explain the meaning of (a) water of crystallization, (b)
vapor density, (c) absolute temperature, (d) metathetic reaction, (e) saturated solution.
14 Describe a process for obtaining tin, writing the reaction ..
. State the properties, occurrence in nature and uses or tin.
IS Describe the manufacture of gunpowder.
Ulli7 ersity of tile' State of New York
1
High
School
I59TH
EXAMINATION
CHEMISTRY,
Thursday,
June
IS,
Department
I899-I.I5
part
to
2
4·I5
p. m., only
Allomer
fO questiollS
but no more.
If 1II0re thall fO are! answered
only
the first
fO
answers
'will be o)lIsiri,-r,·d.
Eaclt cOllljJ/de answer
will
rect'Z',le fO cY,·rills.
PajJ,'rs <'lltli/,'d to 75 or 11101','credits wzl/ be accejJted,
Describe a method of demonstrating the presence of CJ.rdioxid in the exhalation hom the lungs.
2 'Write
a reaction for the preparation of carbon dioxid.
State the physical and chemical properties and olle use of
carbon dioxid.
3 Describe the preparation and mention Olle important use
of (a) coke, (b) bone-black.
4 Give a description of some process illustrating
the use of
carbon as a reducing agent.
5 Describe the manufacture of illuminating gas.
6 Explain why the flame of an ordinary kerosene lamp
smokes when the chimney is removed.
7 Describe the preparation
of charcoal on a large scale.
Mention and illustrate two important uses of charcoal.
8 State a theory to account for the formation of (a) coal, (b)
natural gas,
9 Describe an experiment to demonstrate the presence of
hydrogen in organic substances.
IO What are the effects on the production
of light and heat
by the flame of a Bunsen lamp if the holes in the base are (a)
opened, (b) closed? Give a detailed explanation,
I I Give the
composition and state the use of aqua regia.
On what does the efficiency of aqua regia depend?
12
Describe the preparation of metallic arsenic, writing reacMons. Mention the properties and one use of metallic arsenic.
13 Describe an experiment illustrating
the affinity of phosphorus for oxygen, writing reactions,
14 \Vrite reactions for the preparation from a dibasic acid of
(a) an acid salt, (b) a normal salt.
IS State the successive steps in the orderly qualitative determination of FeCl2 in an unknown solution.
I
bOE
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