Find the pH of each of the following solutions of mixtures of acids.: 1. 0.170 M in HNO2 and 9.0×10−2 M in HNO3 2. 0.190 M in HCHO2 and 0.23 M in HC2H3O2 3. 5.0×10−2 M in acetic acid and 5.0×10−2 M in hydrocyanic acid

For which one of the pairs of acids and bases does the following represent the net ionic equation?

H3O+ +OH- ___ 2H2O a NaOH, HBr b CH3COOH, Ca(OH)2 c HNO3, Mg(OH)2 d CH3COOH, Cu(OH)2 e CH3COOH, Cr(OH)3

Potassium cyanide (KCN) reacts with acids to form a deadly poisonous gas, hydrogen cyanide (HCN). The reaction is represented by the equation:

KCN(aq) + HCl(aq) è KCl(aq) + HCN(g)

If a sample of 0.150 g of KCN is treated with an excess of HCL, calculate the amount of HCN produced, in grams.

1. Why is it important to know the difference between acids and bases, in terms of safety?

2. Ionic bonds, covalent bonds and hydrogen bonds all help to hold chemical entities together. Distinguish between these types of bonding and explain which type of bonding is responsible for matching the base pairs in DNA.

One method for preparing alcohols involves hydration of alkenes with aqueous acids (such as sulfuric acid and water). In light of this fact, it seems surprising that the phosphoric acid promotes the elimination of cyclohexanol to give cyclohexene plus water at high temperatures, the very components required to make cyclohexanol. Why was your experiment successful?

1. What are the main differences between the subject areas in human biology, human evolution, and human ecology? What are the Key similarities?

2. From studying nonindustrial societies, what can we learn about enviormental problems like pollution and global warming?

3. What are the main features of a hunter-gatherer lifestyle? What insight does the study of ! Kung hunter-gatherers offer for understanding human biology?

Explain the role of NADH and FADH2 in cellular respiration

Explain the orientation of the large and small ribosomal subunits, as well as the initiator tRNA during initiation of translation

Describe how the release factor separates the amino acid chain and ribosomal subunits to terminate translation

Describe why mitosis would not be effective for the production of new gametes (

Selenocysteine has pKa values for the a-amino, a-carboxyl, and sidechain groups of 10.0, 1.90, and 5.4, respectively. the sidechain looks just like cysteine, but has a selenium in place of the sulfur. In terms of protonation and charge, selenium behaves like oxygen or sulfur. Answer the following.

1) what is the overall charge of selenocysteine at pH 6.2?

Which of the following does not occur during the termination phase of translation?

Select one:

a.

The newly formed polypeptide is released.

b. A termination codon causes the A site to accept a release factor.

c. The two ribosomal subunits separate.

d. A tRNA with the next amino acid enters the P site.

e. Translation stops.