PBE NOV 2014 Flashcards
Who is the person behind carbon dating method?
Willard Libby
Which do float?
balsa wood, ethylene glycol, table salt and ethanol
balsa wood
Which of the following decrease in entropy
melting of ice
What result from three alpha emissions and two beta emissions of Rn-222?
Lead-210
Fundamental class of reactions in which an electron rich nucleophile selectively bonds with or attacks the positive or partially positive charge of an atom or a group of atoms to replace a leaving group.
Nucleophilic substitution
Where is ozone layer found?
Stratosphere
What is the solid part of the earth’s crust?
a. hydrosphere
b. lithosphere
c. troposphere
d. atmosphere
b.lithosphere
Synthetic dye
a. alizatrin
b. melanin
c. carotenoid
c.carotenoid
One way of obtaining IR spectra of solids is
Nojul Mull process
What is the sign convention of enthalpy during endothermic reaction?
positive
The position and the velocity of an object (particles, atom) cannot both be measured exactly, at the same time, even in theory.
Heisenberg Uncertainty Principle
What is the polymer used for printing and coating?
Look for this muna.
Another name of Taurine.
Aminoethanesulfonate or
2-aminoethanesulfonic acid
Internal energy is composed of all energy in the system except:
a. free energy
b. kinetic and potential energy
c. heat of fusion
d. enthalpy
SEARCH MUNA.
Example of pseudo plastic fluid
a. apple sauce
b. rubber latex
c. tap water
d. sewage sludge
a. apple sauce
