battle of the chem wizards 2006
TRANSCRIPT
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Philippine Normal UniversityCollege of Science
Department of Physical Sciences
CHEMICAL SOCIETYwww.pnuchemsoc.cjb.net
Battle of the Chem Wizards16 February 2006University Auditorium
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EASYROUND
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#1
What is the phase changefrom gas to solid?
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Answer:
DEPOSITION
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#2
Magnesium hydroxide is usedto treat hyperacidity,what is its common name?
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Answer:
MILK OFMAGNESIA
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#3
What do you call substancesthat when dissolved in water results in a solution that can
conduct electricity?
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Answer:
ELECTROLYTES
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#4
Which isotope of hydrogenis utilized innuclear reactors?
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Answer:
DEUTERIUM
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#5
Which charged particle didErnest Rutherford used inhis experiment that lead to
the discovery of protons?
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Answer:
ALPHAPARTICLES
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#6
What is the color emitted by sodium ina flame test?
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Answer:
YELLOW
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#7
What is the name of thecompound with a molecular formula of K 2Cr 2O 7?
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Answer:
POTASSIUMDICHROMATE
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#8
What is the molecular geometry of carbon dioxide?
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#9
What theory states thatacids are electronpair acceptor?
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Answer:
LEWISTHEORY
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#10
Among the given molecules:H2O, NH 3, CO 2, and SO 2,
which one does not have a
lone pair on its central atom?
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Answer:
CO 2
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#1
Predict the productof the reaction:
HNO3
+ NH3 ?
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Answer:
NH 4NO 3
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#2
How much water (in grams)will you add to a 10.0g sugar
to prepare 18.0% bymass solution?
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Answer:
45.6 g
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#3
What is the indicator used in acid-base titration
that turns light pink when anendpoint is reached?
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Answer:
PHENOLPHTHALEIN
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#4
What factor affects thechemical equilibriumconstant?
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Answer:
TEMPERATURE
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#5
Calculate the total number of electrons that can be
present in the principal levelfor which n = 4.
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Answer:
32
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#6
What is the oxidationnumber of carbon (C)in C 2O 4
2-?
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Answer:
3+
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#7
A compound has the empiricalformula SF 4. At 20°C, 0.100g
of the gaseous compoundoccupies a volume of 22.1 mL and exerts a pressure
of 1.02atm. What is themolecular formula of the gas?
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Answer:
SF 4
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#8
In nuclear chemistry,the activity of the radioactivesource is expressed as onenuclear disintegration per
second. What is its acceptedSI unit of measurement?
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Answer:
Bq
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#9
What is the order of reactionwhen the half life is
independent of the initialconcentration?
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Answer:
FIRST ORDER
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#10
Sulfur is a nonmetallicelement that is present
in coal. How many atomsare in 16.3g of S?
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Answer:
3.06 x 10 23 atoms
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DIFFICULTROUND
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#1
What is the percentcomposition by mass
of oxygen (O) inphosphoric acid (H 3PO 4)given its molecular mass
of 98.00g/mol?
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Answer:
65.31%
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#2
The density of a materialis 22.57 g/mL. If the shape
of the material is sphericalwith the diameter of 15.00 cm.
calculate the mass inkilograms?
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Answer:
39.88 kg
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#3
What is the density of carbon dioxide at StandardTemperature and Pressure
(STP)?
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Answer:
1.9 g/L
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#4
Ethanol can be used as fuel.
Write the combustionreaction of ethanol,assuming complete
combustion.
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Answer:
C 2H 5OH + 3O 2 2CO 2 + 3H 2O
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Answer:
W = P( V)
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#6
Balance the half reaction:Mn 2+ MnO 2
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Answer:
Mn 2+ + 2H 2O MnO 2 + 4H + + 2e -
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#7
What do you call thephenomenon wherein
visible light or UV lightis emitted by a molecule
upon promotion to an excitedstate by chemical reaction?
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Answer:
CHEMILUMINESCENCE
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#8
A mixture of helium and neongas is collected over water at 28.0°C and 745mmHg.
If the partial pressure of Helium is 368mmHg,
what is the partial pressureof neon? (Vapor pressure
of water at 28°C is 28.3mmHg)
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Answer:
349mmHg
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Answer:
18.3 M
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#10
Calculate the amount of water
(in grams) that must beadded to 5.00g salt to prepare
16.2% by mass solution.
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Answer:
25.9g
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CLINCHERROUND
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#1
What is the common namefor sodium bicarbonate?
Easy
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Answer:
BAKINGSODA
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#3
At what temperature doesthe density of water is
at its greatest?
Easy
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Answer:
4° C
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#4
What is the energycurrency of the cell?
Easy
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#5
In electrochemistry,at what electrode will the
oxidation occur?
Easy
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Answer:
ANODE
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#6
What is the oxidationnumber of nitrogen (N) in
nitric acid (HNO 3)?
Average
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Answer:
5+
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#7
What type of systemdoes not allow the transfer of either mass or energy?
Average
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Answer:
ISOLATEDSYSTEM
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Answer:
PHYSICALCHEMISTRY
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#9
What do you call the fractionof the total charge carried
by the ion in an electrolyte?
Average
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Answer:
TRANSPORTNUMBER
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#10
Calculate the amount of water
(in grams) that must beadded to 5.00g salt to prepare
16.2% by mass solution.
Average
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Answer:
25.9g
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