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what is the difference naturally occurring antibiotics and chemically synthesized or semi-synthetic antibioti
Semi-synthetic antibiotics are derivatives of natural antibiotics with slightly different but advantageous characteristics. For example, they can act against bacteria which are resistant to the original compound, have a greater...
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Discuss as to why an increase in naturally occurring marine bacteria can actually harm the ecosystem
Marine bacteria are pervasive and play many different roles in the marine environment, from being the base of the food chain, controlling much of the flow of marine energy and...
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Gallium has two naturally occurring isotopes with mass 69 and 71 respectively. What is the peecentage abundance of both isotopes if their relative atomic mass is 70.59?
solutionLet the percentage of the isotope 71 Gallium be =y%The percentage of the isotope 69Ga is =(100−y) %Therefore, we write the mass balance equation100×69.72 = y×71+(100−y) ×696972 = 71y+6900−69y2y=6972−6900=72y=36The percentage of the isotope is =36%
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Potassium has two naturally occurring isotopes: k-39 ( 93.12%; mass= 38.9637 amu), and k-41 ( 6.88%; 40.9618 amu). Calculate the atomic weight for potassium.
Atomic weight for potassium=39.1011amu.
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Natural boron is composed of two isotopes: 19.78% boron-10 (atomic mass = 10.0129 amu) and 80.22% boron-11 (atomic mass = 11.0093 amu). What is the average atomic mass of naturally occurring boron?
Average atomic mass=(19.78%*10.0129amu + 80.22%*11.0093amu)/100%=10.8122amu
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What can we deduce from a 17% yield percentage?
The actual yield is the amount of product that is actually formed when the reaction is carried out in the laboratory. The percent yield is the ratio of the actual...
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Based on you understanding of what causes rigor mortis, deduce how rigor mortis can be hastened on the site of the most active muscle before dead. Explain
Let's consider biochemical basis of rigor mortis:1) After death, the concentration of ATP inside cells begins to fall.2) Once there is no ATP left in the cell, myosin heads bonds with...
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How can we deduce that electrons are not stationary?
When stationary electrons get a portion of energy they move from one orbit to another. Being in this non-stationary state they usually radiate energy. By this it can be deduced...
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Carbon has two naturally occurring isotopes: C-12 (natural abundance is 98.93%) and C-13 (natural abundance is 1.07%).How many C-13 atoms are present, on average, in a 1100-atom sample of carbon?
The number of C-13 atoms equals: N(C13) = (1100 × 1.07 %)/100% = 11.77 ≈ 12 atoms
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silver has two naturally occurring isotopes, one of mass 106.91 amu and the other of mass 108.90amu. FInd the fractional abundances for these two isotopes. The atomic weight is 107.87 amu
Notice that the abundance of Ag-107 (106.91 amu) is assigned “x” and the Ag-109 (108.90 amu) is “1 – x”. 106.91x + 108.90(1 – x) = 107.87 106.91x + 108.90...
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