1) If the hydrogen ion concentration of a solution is 10–10M, is the solution is definitely alkaline. The thing I used to determine that fact is basic point - <span>pH above 7 is always alkaine, and as a proof we can see from the task that </span><span>the concentration of hydroxyl OH- is pretty higher than hydrogen H+, which is a direct charachteristic of alkain solution.
Here is a tip for you, I bet it will be useful :
</span>>7 = basic
<span><7 = acidic </span>
7 = neutral
2) The most suitable answer for the second question is the negative logarithm of the hydrogen ion concentration. Pay attention to letters P and H, which pose as little promt as they point on Potential of Hydrogen. And the reason why it is negative is that scale of Ph is positive by default, but due to the fact that ion concentration is always less than 1, and as a result we get <span>the negative logarithm.
3) According to the small table shown in the first question, the answer is </span>[H+] = 1 x 10–11 M which is <span> pH 11, as I mentioned, since Ph is above 7 it is a basic solution.
</span>
Cr.
Cr is the only element listed that is located in the d-block of the periodic table.
<span>A. Acids; pH less than 7
The pH scale is assigned to an agreed standard arrangements whose pH is set up by universal understanding. The scale is between 0 and 14 , values between 0 and 7 are acidic while 7 is neither acidic or base; values greater than 7 are considered as base. In context of the question above, only acids have the characteristics of being corrosive with strong smell so, the correct option is A</span>
Please list your question in the comments.
Answer:
5' RG GWCCY 3'
3' YCCWG GR 5'
Explanation:
The enzyme PpuMI is a restriction endonuclease enzyme, it has a specific recognition site where it cut the DNA. The source of the enzyme is from an E. coli strain that carries the PpuMI gene from Pseudomonas putida (R. Morgan).
The enzyme PpuMI recognizes specific sequence with palindrome arrangement. It target the sequence 5' RGGWCCY 3'
target Sequence: 5' RGGWCCY 3'
3' YCCWGGR 5'
The enzyme cleavage point is at:
5' RG^GWCCY 3'
3' YCCWG^GR 5'
The product of the cleavage will give a sticky end Cleavage:
5' RG GWCCY 3'
3' YCCWG GR 5'
Note: R stands for purines (adenine and guanine). Y stands for pyrimidines (cytosine, thymine, and uracil). And W represents adenine or thymine.
