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