Question:
Poor accuracy can not provide good precision. true or false
Answer
false
It is not necessarily that inaccuracy may result into a poor precision, this may happen in several readings and though not accurate, it might be precise
Explanation
This is not desirable in a lab situation because the “high” accuracy may simply be random chance and not a true indicator of good measuring skill this is why it is not good during laboratory work. For example, Thermometers often read more reliably within a certain range and give increasingly inaccurate (but not necessarily imprecise) values outside of that range. that is why it holds true to say that a reading is not accurate but there is precision in it
Question:
GC is usually used to analyze volatile chemicals, but in some cases it can also be used to analyze non-volatile chemicals, such as glucose and fructose, if those non-volatile chemicals are properly chemically derivatized. true or false
Answer
True
For a compound to be analyzed using a GC, then it must be volatile and thermally stable. For those that are non-volatile, they are first passed through derivatization reactions which include silylation, alkylation or acetylation are available
Explanation
In general, there are several compounds that qualify to be analyzed through this method, which may include a number of volatiles like ketones, lipids, and hydrocarbons up to 12 carbons, which all can be directly measured. Furthermore, there are those metabolites which are non-volatile or semi-volatile including sugars, amino acids, lipids, and others, all of which are accessible only derivatization which is defined as transforming a chemical compound into a product of similar chemical structure
Question:
Since all anthocynidins have similar structures with aromatic chromophores, they can be theoretically detected by UV-Vis detectors
True or false
Answer
true
this is true because, generally, the process is successful for those UV-absorbing compounds, such as alkenes, aromatics, and compounds that have multiple bonds between C and O, N, or S
Explanation
In this method, the different factors in chromophore’s structure go into determining what wavelength of light it will absorb which causes a difference in the color which is actually the case that would result if anthocynidins which only have the same structure as the chromophores, were used. Which is the reason why the process is successful for those UV-absorbing compounds, such as alkenes, aromatics, and compounds that have multiple bonds between C and O, N, or S and this makes it true only in a condition that all the anthocynidins have the same structure as the chrmophore
Question:
FDA is in charge of registration and inspection of pesticides in any foods
true or false
Answer
true
this is the case in U.S because what happens is that the PCA already authorized the FDA to ban pesticides they determined to be unsafe if they were sprayed directly on food that is why it is in full termed as the Food and Drug Administration (FDA)
Explanation
generally, the FDA is responsible for ensuring that human foods and animal feeds are safe and aims and ventures into protecting the public health by assuring the safety, security as well as efficacy of human and also veterinary drugs, biological products like pesticides in our case, medical devices, our nation’s food supply, cosmetics, and products that emit radiation. Thus, it can ban pesticides that are determined to be unsafe if they were sprayed directly on food that is why it is in full termed as the Food and Drug Administration (FDA)
