I have the answers I just need explanations of the answers please 8) Why does pu
ID: 514094 • Letter: I
Question
I have the answers I just need explanations of the answers please
8) Why does pure ethanol evaporate more quickly than pure water at room temperature? A) Ethanol molecules are held together by covalent bonds, while water molecules are held together by hydrogen bonds B) It is unable to mix with water. C) Ethanol has a higher specific heat capacity compared to water. D) Water has a lower molar mass. E) There are less hydrogen bonds formed among ethanol molecules. 9) The concentration of O ons in a solution is 10-4 M. The pH of the solution is: D) 10-4. A) 18. B) -4. C) 10. E) 4. 10) Which of the following is a correct statement about covalent bonds? A) The bond between O and H in a water molecule is a polar covalent bond. B) Covalent bonds formed between atoms of the same element will be polar C) Hydrogen bonds are nonpolar covalent bonds. D) Hydrogen bonds are polar covalent bonds. E) Atoms of similar electronegativity (like Cand H) will form a highly polar covalent bond between them.Explanation / Answer
(8) (E) There are less hydrogen bonds in ethanol than in water
(9) (C)
pH = 14 - pOH
pH = 14 + Log[OH-] = 14 + Log(10-4) = 10
(10) (A)
(7)
(D) The non polar bonds in octanol caus overall iability to interact with water.
Though both ethanol and octanol have hydroxyl groups, the length of non polar chain(hydrocarbon part) in octanol is more than in ethanol, it does not allow the molecule to interact with water.
(8) (B) Carbon is important for living systems because all the macromolecules are made from them
(9)
(B) cis - trans and structural only
(10) (A) i and iii are isomers to one another. Because they have same molecular formula but differ in the length of chain
(11) (A) 4 asymmetric carbons are there.
Asymmetric carbon is the one which is attached to four different atoms or groups
(12) (D) One is hydrophobic (isopropyl group) and the other is polar ( OH)