Answer:
<h2>None</h2>
Explanation:
In the given sequence there is 9 amino acid in which 2 are positively charged amino acid and 7 are neutral amino acid at physiological pH . In each amino amino acid two oppositely charged amino and carboxyl group is present ,where amino is positively charged and proton acceptor and carboxyl is negatively charged and proton donor at physiological pH . pH below neutral cause addition of proton in amino group and makes amino acid positively charged , while pH above neutral cause addition of hydroxide ion in carboxylic group and makes amino acid negatively charged . At pH-4 , all amino acid in the given sequence become positively charge due to addition of proton in the solution ,these protons in the solution binds to amino acid sequence, hence there is no negative charged amino acid in the sequence .
How to solve 20.0 mL/ 5.7 g with significant figures and including units?
Answer:
Hope this Helps!!
The formula for density is the mass of an object divided by its volume. In equation form, that's d = m/v , where d is the density, m is the mass and v is the volume of the object. The standard units are kg/m³.
Answer: 10.3 grams of Copper oxide is left unreacted.
Explanation:
To calculate the moles :
The balanced chemical reaction is:
According to stoichiometry :
1 moles of 
require = 1 mole of 
Thus 0.5 moles of will require=
of
Thus is the limiting reagent as it limits the formation of product and is the excess reagent.
moles of CuO left = (0.63-0.5) mol= 0.13 mol
Mass of left =
10.3 grams of Copper oxide is left unreacted.
Halogens are rarely found in native state because halogens are highly reactive.
<h3>
What is Halogens ?</h3>
The group 17 elements are known as Halogen group. These elements include Fluorine, Chlorine, Bromine, Iodine and Astatine. Halogens react with metals to form salts. Halogens are non metals. Halogens are highly reactive and halogens are never found in pure form. Halogens not occur in free state.
<h3>How many valence electron are present in Halogens ?</h3>
Halogens have seven valence electrons in the outermost shell. The electronic configuration of Halogen is ns² np⁵.
Thus from the above conclusion we can say that Halogens are rarely found in native state because halogens are highly reactive.
Learn more about the Halogens here: brainly.com/question/364367
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We can use the following formula when making diluted solutions from more concentrated solutions.
c1v1 = c2v2
where c1 is the concentration and v1 is the volume of the concentrated solution
and c2 is concentration and v2 is volume of the diluted solution to be prepared
substituting these values in the equation
2.0 M x V = 0.300 M x 500 mL
V = 75 mL
75 mL should be taken from the stock solution and diluted upto 500 mL to make the 0.300 M solution
