What would be the pH of a solution with a hydroxide ion [OH^-] concentration of

Question

What would be the pH of a solution with a hydroxide ion [OH^-] concentration of 10^-12 M? A) pH 2 B) pH 4 C) pH 10 D) pH 12 E) pH 14 Dehydration reactions are used in forming which of the following compounds ? A) triacylglycerides B) polysaccharides C) proteins D) A and C only E) A, B, and C Van der Waals interactions result when A) momentary attractions occur between asymmetrically distributed electrons in molecules. B) molecules held by ionic bonds react with water. C) two polar covalent bonds react. D) a hydrogen atom loses an electron. E) one water molecule interacts with another water molecule. Which of the following best describes the relationship between the atoms described below? A) They are isomers. B) They are polymers. C) They are isotopes. D) They contain 1 and 3 protons, respectively. E) They each contain 1 neutron. Which statement about phospholipids is FALSE? A) They are hydrophilic at one end. B) They contain glycerol linked to fatty acids. C) They are a major part of cell membranes. D) They are hydrophobic on one end E) Because their phosphate groups repel each other, they are used as organisms' main form of short-term energy For a covalent bond to be polar, the two atoms that form the bond must have A) differing atomic weights. B) differing numbers of neutrons. C) differing melting points. D) differing electronegativities. E) similar electronegativities. A protein's biological function is dependent on its _____. A) pH B) temperature C) shape D) size E) weight

Explanation / Answer

8.Ans – A

Explanation- This is because the total concentration of hydroxide ions is 14. So all you need to do is subtract. 14-12 = 2

9.Ans- E (triacylglycerides, polysaccharides, and proteins)

Explanation-When two monosaccharides join together, water is released. This is known as a   dehydration reaction. It is called synthesis because a disaccharide is being synthesied. When monosaccharides are joined together by dehydration synthesis then it is called glycosidic linkage, it is a covalent bond. When lipids are being bonded together the bond is called an ester bond. When amino acids are joining together to form a polypeptide then the bonds are called peptide bonds.

12.Ans- E

Explanation-phosphate group are made up of fatty acids and the also have the hydro phobic and hydrophilic ends.

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