Answer: A substitution is a mutation that exchanges one base for another (i.e., a change in a single "chemical letter" such as switching an A to a G). Such a substitution could: change a codon to one that encodes a different amino acid and cause a small change in the protein produced.
Explanation: I know this is correct just trust me and please mark me as brainiest.
Q6. 3
Q7. 3
Q8. pH
Q18. 3
Q19. 3
Q20. 4
Hope this helped？？
Answer:
HYDROGEN BONDING
Explanation:HYDROGEN BONDING is the major intermolecular force and interaction taking place when water and ethanol are mixed.
Hydrogen bond is a weak inter-molecular force of attraction which occurs when the partially charged Negative end of an oxygen atom from one oxygen molecule attracts and interacts with the partially charged Positive end of the Hydrogen atom in another Molecule, Hydrogen bonds are also known as dipole-dipole bonds.
The given solution is a mixture of 
and 
. It acts as a buffer as it is a combination of the weak acid 
and it's conjugate base 
.
![[Acid] = [HCO_{3}^{-}]=1.0 M](https://tex.z-dn.net/?f=%5BAcid%5D%20%3D%20%5BHCO_%7B3%7D%5E%7B-%7D%5D%3D1.0%20M)
![[Base] =[CO_{3}^{2-}]=0.1 M](https://tex.z-dn.net/?f=%5BBase%5D%20%3D%5BCO_%7B3%7D%5E%7B2-%7D%5D%3D0.1%20M)
pH of the buffer solution can be calculated from Hendersen-Hasselbalch equation as below:
![pH=pK_{a}+log\frac{[CO_{3}^{2-}]}{[HCO_{3}^{-}]}](https://tex.z-dn.net/?f=pH%3DpK_%7Ba%7D%2Blog%5Cfrac%7B%5BCO_%7B3%7D%5E%7B2-%7D%5D%7D%7B%5BHCO_%7B3%7D%5E%7B-%7D%5D%7D)
pH = 10.33+(-1)
= 9.33
Mendeleev left gaps in the periodic table because, in the future, he knew that there would be more elements to be discovered because not all elements were discovered at the time.
