PBE APR 2014 Flashcards
Process of breaking down a large isotope into smaller isotopes.
a. nuclear fission
b. beta particle emission
c. nuclear fusion
d. gamma ray emission
a. nuclear fission
Formula of Red Lead
Pb3O4
Can oxygen be synthesized from nitrogen?
a. Yes, by the bombardment of alpha particles
b. Yes, by electron capture
c. Impossible
c. Impossible
Unless exposed in temperatures as that of sun and stars
Author of octet rule
Gilbert Lewis
How does alpha, beta and gamma particle affect the mass number of an atom?
4,0,0
Iodine vapor forms iodine crystals when it touches a cold surface. What is the reverse of the process being described?
sublimation
Notation on alkane containing Cl
a. chloro
b. chloride
c. chlorate
d. chloric
a. chloro
Given: Dodecane I. Is it soluble in water? II. Is it soluble in hexane? III. Is it combustible? IV. Is it solid, liquid or gas at room temp. & atmospheric conditions? V. Is it denser than water?
Ans: no, yes, yes, liquid, less dense
Characteristics of elements under group 1A
Has 1 electron on its outer most energy level
A tank is half filled with water, if N2 =1.02 moles and H20 =1.02 moles. What happens to the N2 when dissolved in water?
a. increase
b. decrease
c. remains the same
d. none of these
C.
Description of a primary and a secondary cell
A primary cell can be recharged while secondary cannot, Ni-Cd is a primary cell, a dry cell is a secondary cell.
Adolf Baeyer’s contribution in medicine, made by reacting malonic acid and urea with a catalyst is called.
Barbituric acid
Which layer of the atmosphere contains the ozone layer?
Stratosphere
Composition of acid in acid rain?
a. nitric and carbonic
b. sulfuric and carbonic
c. nitric and sulfuric
c. nitric and sulfuric
Which of the ff has a higher heat of combustion on a gram per gram basis if Hf is 237 kj/mol and 532 kj/mol for methane and propane respectively?
Methane