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MICR-134 (MICRO EXAM 1) MICROBIOLOGY AT PUC WITH SUNG 2024!!
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MICR-134 (MICROEXAM 1)
MICROBIOLOGY AT
PUC WITH SUNG
2024!!
MICR-134
Evatee 8/13/24 MICR-134
,MICR-134 (MICRO EXAM 1) MICROBIOLOGY
AT PUC WITH SUNG 2024!!
In atoms, the nucleus does contains ____. Choose TWO CORRECT answers.
Answer - Proton, Nucleus
The atomic number of Atom "X" is 5 and it has 7 neutrons. What is the atomic
weight? Answer - 12
Regarding electron shell, Choose a WRONG statement.
A)is the space within the atom where electrons are usually found
B)Inner shells are filled last
C)Outermost shell is left incompletely filled if there are not enough electrons to
completely fill the shell
D)Only atoms with unfilled outer shells will participate in a chemical reaction
Answer - Inner shells are filled last
Which does NOT have same number in the same atom? Answer - atomic
weight
ionic bond Answer - Is formed by one partner loosing and the other partner
gaining an electron in a molecule
covalent bond Answer - a pair of molecules shares electrons
hydrogen bond Answer - forms between molecules but never in molecules
, ____ bonds has the strongest binding force in living organisms. Answer -
covalent
Water is ___ and ___ molecule. Choose TWO answers.
polar
nonpolar
symmetric
asymmetric Answer - polar and asymmetric
The molecular weight of Ammonia, NH3 is ________ in Daltons (grams).
Answer - 17
Regarding carbonic acid, H2CO3 (Molecular weight = 62 Daltons (grams)),
Choose a WRONG statement.
One mole of the carbonic acid has 6.02X10^23 particles
One mole of the carbonic acid weighs 62 grams
If two moles of the carbonic acid dissolved in 1 liter of solution, the Molarity is
2
10% carbonic acid solution contains 10 gram of the carbonic acid in 1,000 ml of
solution
all of the above are correct Answer - 10% carbonic acid solution contains 10
gram of the carbonic acid in 1,000 ml of solution
pH < 7 means _____. Answer - acid
Choose a WRONG one.
Log100 = 2
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