DAY 1 PBE Flashcards by Deleted Deleted

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

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Which of the following blocks has a greater number of elements? s,p,d or f

d block

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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

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EDTA -

Ethylenediaminetetraacetic acid, C10H16N2O8, chelating agent, Gerold Schwarzenbach

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Laguna lake is found to have 100 mg/L of CO32- find the maximum concentration of Ca2+ ion.

100 ppm

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30 μA and 40 sec, how many electrons passed through the cathode ray tube?

1.2437x10-8 electrons

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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

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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

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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

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density of acetylene gas -

0.02 g/mL

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What is the composition as mass percent of the sample mixture? -

44%

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40 mL of an acetic acid solution -

0.07 M

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specific conductance -

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C6H5OOH solution with 0.30 M KOH -

8.63

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molar mass of sodium diatrizoate -

639 g/mol

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charge on the ruthenium ions -

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Given box with D=1.59 m., E=48.69 J, μ=0.207. What is the mass of the box?

15.1 kg

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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

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What happens to the enthalpy content of the real gases when it is throttled at constant temperature?

Enthalpy will not change

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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

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What is the sign convention of enthalpy in an endothermic process?

Positive

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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

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What is the ideal gas law that applies when a balloon is expanding when heated?

Charles Law

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How many grams of NaCl is required to make 200 mL aqueous solution of 5%(w/v) NaCl?

10g

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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 -

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.

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

84. 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 -

Match the following nuclear reaction. Artifical Radioactivity = Induced Radioactivity Hydrogen Fusion Reaction (in Sun) = Natural Radioactivity