Answer:
A) B has more electron shells then A
Explanation:
Element A is flourine
Element B is chlorine
Chlorine has three electron shells and flourine only has 2 electron shells (on Bohr model)
Chlorine's outer shell has 7 electrons and so does flourines outer shell(on bohr model)
Sense Answer A is correct and Answer B is wrong, common snese will tell you that D is wrong sense B is wrong, and sense D is wrong that means only one is right and sense A is correct it makes C wrong
Answer/Explanation:
STR analysis
Short tandem repeats (STRs) are the genetic information present in the FBI's database. These are repetitive regions of the genome, and used for DNA profiling in a variety of applications. They can be used to discriminate between non-related individuals, as people have different numbers of repeating units. A combination of approximately 13 regions are analysed, giving a unique genetic fingerprint
mtDNA analysis
mt DNA is mitochondrial DNA. This type of analysis can trace the maternal lineage of a person, as mitochondrial DNA is inherited from the mother, and is largely unchanged throughout a maternal line. This is often useful when DNA is too degraded to obtain accurate STRs, as there are many more copies of mtDNA in the cell than nuclear DNA. It is also useful for linking missing relatives.
Answer: The mass of produced is, 149 grams.
Explanation : Given,
Mass of = 354.2 g
Molar mass of = 278 g/mol
Molar mass of = 58.5 g/mol
First we have to calculate the moles of
Now we have to calculate the moles of
The balanced chemical equation is:
From the reaction, we conclude that
As, 3 moles of react to give 6 mole of
So, 1.27 moles of react to give mole of
Now we have to calculate the mass of
Therefore, the mass of produced is, 149 grams.
Selenium (Se)
The covalent polar bond is in compound of carbon and selenium - carbon selenide CSe₂.
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