DAY 1 PBE Flashcards
Given Pb and U – 238…0.3g of lead and 1.7g of uranium, if the half-life of the latter is 4.5x109 years and assuming that all the lead comes from the decay of uranium, estimate how old is the earth?
1.2x109 yrs
Which of the following blocks has a greater number of elements? s,p,d or f
d block
If the cosmic radiation discovered by the two Nobel prize winners in 1965 has a perfect black body spectrum with a temperature of 3.01K, at what wavelength is the most intense radiation? In what range of electromagnetic radiation does this wavelength fall?
9.62x10-4 m; infrared
EDTA -
Ethylenediaminetetraacetic acid, C10H16N2O8, chelating agent, Gerold Schwarzenbach
Laguna lake is found to have 100 mg/L of CO32- find the maximum concentration of Ca2+ ion.
100 ppm
30 μA and 40 sec, how many electrons passed through the cathode ray tube?
1.2437x10-8 electrons
How many Mn2O4 can be produced in grams, ounce, and mole from 1 gram of Mn2O2?
1 mole Mn2O4
173.88 grams Mn2O4
6.13 ounces Mn2O4
Mn metal is produced from ore containing 29.5% Mn(OH)2, if 1ton of metal is to be produced, how much ore is needed?
5.5 tons ore
Moles of chlorine dioxide that can be formed from a given mass of sodium hypochlorite
2NaClO2 + 2HCl + NaOCl 🡪 2ClO2 + 3NaCl + H2O
0.027 moles/g
density of acetylene gas -
0.02 g/mL
What is the composition as mass percent of the sample mixture? -
44%
40 mL of an acetic acid solution -
0.07 M
specific conductance -
58
C6H5OOH solution with 0.30 M KOH -
8.63
molar mass of sodium diatrizoate -
639 g/mol
charge on the ruthenium ions -
+3
Given box with D=1.59 m., E=48.69 J, μ=0.207. What is the mass of the box?
15.1 kg
1mol of gas A at 1bar and 1mol of gas B at 2bar. If the membrane separating the two gas mixtures is removed, find the entropy change of the mixture.
11.5 J/K
What happens to the enthalpy content of the real gases when it is throttled at constant temperature?
Enthalpy will not change
Given initial temperature of copper metal = 258 degC, nilagay sa 250g water with initial temperature of 25degC. Final temperature of the mixture is 250degC. What is the weight of copper?
72 kg
What is the sign convention of enthalpy in an endothermic process?
Positive
Calcium dihydrogen phosphate, Ca(H2PO4)2, and sodium hydrogen carbonate, NaHCO3, are ingredients of baking powder that react to produce CO2, which causes dough or batter to rise: Ca(H2PO4)2(s) + NaHCO3(s) → CO2(g)+H2O(g)+CaHPO4(s)+Na2HPO4(s) [unbalanced] If the baking powder contains 31% NaHCO3 and 35% Ca(H2PO4)2 by mass: (a) How many moles of CO2 are produced from 1.00 g of baking powder? (b)If 1 mol of CO2 occupies 37.0 L at 3508F (a typical baking temperature), what is the volume of CO2 is produced from 1.00 g of baking powder?
0.004756 mol CO2, 0.176 L
What is the ideal gas law that applies when a balloon is expanding when heated?
Charles Law
How many grams of NaCl is required to make 200 mL aqueous solution of 5%(w/v) NaCl?
10g
The height of the mercury column in a barometer in a Calcutta laboratory was recorded to be 75 cm. Calculate this pressure in SI.
10x10^4 N/m^2
Freezing point - due to the addition of solutes, the boiling point tends to increase, and freezing point tends to decrease.
What is sacrificial protection in iron: aluminum, magnesium, tin, silver, lead
magnesium
What is the unit of Stefan Boltzmann in ergs?
5.67037×10-5 erg⋅cm−2⋅s−1⋅K−4
% v/v ng 1 teaspoon ng milk pag linagay mo sya sa 1 cup.
48 teaspoons in 1 cup.
normal boiling point of CCl4 -
77
discharge pipe from a sump pump -
56 min
heat 50.0 g of an unknown substance -
ethanol
Internal energy is composed of:
kinetic and potential energy
Synthesis of Valium.
CHLORINATION OF AROMATICS IN FeCl3
Name of reaction for Dye production
Diazotization
What is the danger of using pure methane as a household fuel for heating and cooking?
Very low boiling point and ignition temperature
Steps in formation of PVC
a. Calcium carbide – vinyl chloride – PVC
b. Calcium carbine – acetylene – vinyl chloride – PVC
b. Calcium carbine – acetylene – vinyl chloride – PVC
What is the most polar and least polar of the following functional groups: R-OH, R-NH3, R-COOH, C triple bond C and C-C.
MOST POLAR: RCOOH
LEAST POLAR: C-C TRIPLE BOND
The range of melting point of the fatty acids.
> 43.2 degrees Celsius
Arrange from most to least polar: HF, CN, C-C
HF > CN > C-C
Which is heterocyclic? ANS.
PYRAN AND FURAN
over the lifetime of the plant -
T, T ,T
What is the most polar and least polar of the following functional groups? R-OH, R-NH3, R-COOH, C≡C and C-C., R-COOH > R-OH > R-NH3 > -C≡C- > -C-C- -
Polarity Arrangement (Polarity ≈ Boiling Point)
R-CONH2 > R-COOH > R-OH > R-CO-R > R-CHO > R-NH2 >
R-CO-OR’ > R-O-R’ > -C≡C- > -C=C- > -C-C-
Amide > Acid > Alcohol > Ketone > Aldehyde > Amine > Ester > Ether > Alkyne > Alkene > Alkane
What are the amino acids found in human protein?
NON-ESSENTIAL AMINO ACIDS
It is a neurotransmitter used to regulate reward and pleasure centers of the brain.
DOPAMINE
Bacteria used in the production of pickles.
LACTIC ACID BACTERIA
They are responsible for the human body’s reaction to chemicals such as adrenaline and serotonin.
G-PROTEIN COUPLED RECEPTORS
Chemical process in producing dopamine
L-Phenylalanine → L-Tyrosine → L-DOPA → Dopamine
Choose the common methods in the removal of fine particle in hot airstream common in cement production?
a. ESP
What is oxygen sag curve?
The decrease of dissolved oxygen in a water body after immediate addition of effluent and stabilization of the water body through time.
Which of the following persistent organic pollutants is not a component of fertilizer?
Chlordane, heptachlor
Treatment of municipal wastewater involving bubbling of air
AERATION
DOLOMITE, carbonate water is negligible:
ANSWER: at pH 6.6, 0.00327M=[Ca2+]=[Mg2+]
At pH 5 6, 0.0207M=[Ca2+]=[Mg2+]
Equivalent absorbed dose, 34eV
Ans: 8.7 103 Gy
solution of methylamine, CH3NH2, to decompose completely -
3.6
What is the rate at which mass is lost from the sun -
4.3x106 kg/s
What were the first elements formed in the early stages of cosmic evolution?
HELIUM AND HYDROGEN
How much water is in blood?
83-85%
What is the pH of blood?
7.35-7.45
What is the mass ratio of the moon to the earth?
0.0123
What is the volume ratio of the moon to the earth?
0.0203
What is the pH of gastric juice? (Gastric juice is a thin, acidic digestive fluid secreted by glands in the mucous membrane that lines the stomach. It contains, among other substances, hydrochloric acid.
1.5
What material is found in cold packs?
Solid NH4NO3
How much Argon is in the air?
0.99%
What is the meaning of LASER?
Light
Amplification by
Stimulated
Emission of
Radiation
What salts are found in nitrogen fertilizers?
NO3- & NH4+
It is called the God Particle.
HIGGS-BOSON PARTICLE
A substance made by combining mercury with other metals.
AMALGAM
It is a method to detect the age of artifacts from archaeological excavation.
RADIOCARBON DATING DISCOVERED BY WILLARD LIBBY
It is an allot of bismuth, lead, tin, and cadmium which has a low melting point of 71 degrees Celsius.
WOOD’S METAL
In addition to carbon dioxide and water, what 6 elements are needed by plants for growth?
N, P, K, Mg, Ca, S
NaPaKaMgCaS
What is the oxidizing agent and redox product for breathalyzers?
K2Cr2O7 – CH3COOH
What is the second most abundant cation in the sea?
Mg2+ (1.3 g per kg seawater)
What poison was used to kill Napoleon Bonaparte?
As2O3 poisoning
What test is used to detect arsenic?
Marsh test
Who discovered the positron?
CARL ANDERSON
Temperature sa MOON?
-298F night, 224F day
The compound used in the creation of “tabletop volcanoes.”
VESUVIAN FIRE (NH4)2Cr2O7
It is a miracle material capable of conducting heat and electricity better than any other material.
GRAPHENE
It is the coldest state of matter defying gravity as it flows up instead of down.
BOSE-EINSTEIN CONDENSATE
The most expensive substance in the world.
CALIFORNIUM
How much water is in the human body?
60-70%
It is the softest substance. TALC
How many Earths can fit in Jupiter?
1000
How many Jupiters can fit the Sun?
1000
Aside from the Sun, what is the nearest star to the Earth?
PROXIMA CENTAURI
The most common metal on earth also called the wonder metal.
ALUMINUM
They are the eight noble metals.
RHODIUM, RUTHENIUM, IRIDIUM, OSMIUM, GOLD, SILVER, PLATINUM, PALLADIUM
It can cut through materials that diamond tips could not.
XENON LASERS
Metal liquid at room temperature.
MERCURY
Metal with the highest melting point.
TUNGSTEN
Air becomes liquid at what temperature?
-140 degrees Celsius
How much salt is in the human body?
250 g
Phenomenon which naturally produces ozone.
LIGHTNING
Who invented the lighter?
J. W. DOBEREINER
A large molecule found in wheels of vehicles.
RUBBER
It is three times hotter than the sun.
LIGHTNING
Only letter not found in the periodic table.
J
A bee sting is _____. A wasp sting is _____.
ACIDIC, BASIC
How many ‘lead’ pencils can the carbon in the human body fill?
9000
First compound with a noble gas.
XePtF6
First person to receive the Nobel prize in Chemistry.
HENRY VAN’T HOFF
Effect wherein hot water freezes faster than cold water.
MPEMBA EFFECT
It contains peanuts as an ingredient.
DYNAMITE
Element that does not solidify.
HELIUUM
Metal that melts at the palm of your hand.
GALLIUM
The rarest element on earth.
ASTATINE
How much does water expand upon freezing?
10%
molecules are in one drop of water?
1.7x10^24
How many protons would it take to have the same mass as a grain of salt?
6x10^21 protons
Which is faster: air velocity at night or day?-
night
- Which of the following is not dependent on temperature and wavelength? Black Body
Polymer for printing and coating -
Acrylic and styrene acrylic emulsion polymers
UNIFAC method
UNIQUAC Functional-group Activity Coefficients
SCADA -
Supervisory Control and Data Acquisition
Which of these industries produces electricity aside from its main product? -
sugar industry
difference between measured value and set point
Error
Yamatake system (process automation):
Azbil
Electronic noise inside an electric conductor which is independent of applied voltage:
Johnson noise
Age of Earth
4.54 billion years old, plus or minus about 50 million years
time would elapse before only 11 atoms of bohrium267 remain? -
63 s
Boron-10, an effective absorber of neutrons -
Li
Match the following nuclear reaction.
Artifical Radioactivity = Induced Radioactivity
Hydrogen Fusion Reaction (in Sun) = Natural Radioactivity
