Which are the Brønsted–Lowry acids in the following equilibrium?Which are the Brønsted–Lowry acids in the following equilibrium? CH3COOH(aq) + NaOH(l)⇌ NaCH3COO(aq) + H2O(l)CH3COOH(aq) + NaOH(l)⇌ NaCH3COO(aq) + H2O(l)

Select one:

a. CH3COO–and OH––

b. H2O and OH–

c. H2O, CH3COOH, and OH–

d. CH3COO–and CH3COOH

e. H2O and CH3COOH

Part 2 – Comparing the reactivity of some metals with acids Many metals react with acids, via an electron-transfer (oxidation-reduction) reaction that transforms the metal into dissolved metal ions. A co-product of this reaction is hydrogen gas, formed when hydrogen ions in the acid solution take up electrons from the metal and couple. Your task here is to test a few different metals to see how their reaction intensities compare. 1. Obtain 12 clean small test tubes (they can be slightly wet). Divide them into three sets of four tubes, and label the sets as: “HCl”, “acetic acid” and “water”. 2. To the four “water” test tubes, add about 1 mL of water. To the four “HCl” test tubes, add about 1 mL of 3 M hydrochloric acid using the 1 mL graduated pipette that goes with the reagent bottle. To the four “acetic acid” tubes, add 1 ml of 3 M acetic acid. (Do not mix up the droppers!) Carefully note the smells of the two acids. Do this by wafting air over the sample towards your nose with your hand - never smell a chemical directly. Exp.2: OBSERVATIONS 2 - 4 3. Now divide the tubes into four sets, one of each kind. Label them (or place them on a labeled sheet of paper) as: “steel wool”, “Mg”, “Al sheet” and “Al foil”. 4. To each “steel wool” tube: add a small loosely packed ball of steel wool about 3 mm in diameter. Make initial observations and note the time, then push the steel wool down into the liquids with a clean glass stir rod. Record your observations immediately after mixing and again as time passes: colour changes, gas formation, solid formation (cloudiness), odours, and heat evolution all provide evidence of chemical reaction. [Make notes on Observations/Data page.] Note: compare the acid-treated samples to the “control” water-treated sample – only then can you determine whether any chemical reactions observed are caused by the acid or simply by the water also present. 5. Repeat step 4 with the other metals: ~5 mm strip of magnesium ribbon, 5 mm square of aluminum sheet, and 5 mm diameter loose ball of aluminum kitchen foil.

Regarding Part 2: Consider the physical nature of the metals you tested, their positions on the periodic table, and the different strengths of the acids you used. What conclusions can you draw from your observations of the action of the acids on the different metals you tested? Be careful to explicitly distinguish between speculations you cannot back up and speculations based on any chemistry you may already have learned.

What is the role of amino-acyl-tRNA-synthetases?

A nonstandard amino acid has three ionizable groups, with pKa values of 2.6, 7.4, and 10.13. A 0.1 M solution of this amino acid is made, 100 ml total, at pH 2.6. To this solution is added 10 ml of 1 M NaOH. What is the final pH of this solution after the addition?

A) 3.2
B) 8.0
C) 7.4
D) 6.8
E) 10.13

How does the enzyme-substrate complex actually work to lower the activation energy? I understand that that when the enzyme and substrate combine to form a complex, this is known as the transition state and in this state, the complex is unstable however it lowers the activation energy required. I just don't understand what about this complex lowers the activation energy

In an agricultural experiment, the effects of two fertilizers on the production of oranges were measured. Seventeen randomly selected plots of land were treated with fertilizer A. The average yield, in pounds, was 457 with a standard deviation of 38. Twelve randomly selected plots were treated with fertilizer B. The average yield was 394 pounds with a standard deviation of 23. Find a 99% confidence interval for the difference between the mean yields for the two fertilizers. (Round down the degrees of freedom to the nearest integer and round the final answers to two decimal places.)

Although glycolysis can occur in most cells, gluconeogenesis is mostly limited to two tissues.

Which two tissues are the primary sites of gluconeogenesis?

A. muscle and kidney

B. muscle and brain

C. liver and muscle

D. liver and kidney

1.

A) Compare/contrast how insulin and glucagon signal different blood glucose levels and their effects on glycogen breakdown, glycogen synthesis and glycolysis.

B) Compare the fates of glucose 6-phosphate from glycogen breakdown in liver and muscle

After glycolysis has been completed (and before pyruvate is processed) most of the usable energy from the original glucose molecule is contained in ___ molecules.

a. Acetyl-Coa

b. ATP

c. NADH and FADH2

d. CO2

e. pyruvate