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3 years ago

Which four of the following statements about amino acids are true?

Chemistry

1 answer:

k0ka [10]3 years ago

6 0

Answer: • Phe can undergo oxidation to form Tyr.

• The Ala side chain does not form hydrogen bonds with other amino acids.

• Thr and Ser are polar amino acids.

• Lysine has one stereocenter (chiral center).

Explanation:

Amino acids are simply organic compounds which are known to contain carboxyl and amine functional groups and the main elements that are found in an amino acid are oxygen, carbon, hydrogen, and nitrogen.

The true statements about amino acids are:

• Phe can undergo oxidation to form Tyr.

• The Ala side chain does not form hydrogen bonds with other amino acids.

• Thr and Ser are polar amino acids.

• Lysine has one stereocenter (chiral center).

It should be noted that Methionine is not a thiol but rather a thio ether. Also, proline is simply a neutral amino acid and the statement that proline has an overall charge at physiological

pH(7.4) is false.

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You have 50 g of radioactive C-14. The half-life of C-14 is 5,730 years. How many grams would you have left after 5,730 years?

butalik [34]

Wouldn’t it be 25 g since it’s one half life

3 0

3 years ago

To what pressure must a gas be compressed in order to get into a 3.00 cubic foot

Troyanec [42]

Answer:

133.3atm

Explanation:

Given parameters:

Initial volume = 400ft³

Final volume = 3ft³

Initial pressure = 1atm

Unknown:

Final pressure = ?

Solution:

To solve this problem, we apply Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".

Mathematically;

P₁V₁ = P₂V₂

P and V are pressure and volume

1 and 2 are initial and final states;

Insert parameters and solve;

1 x 400 = P₂ x 3

P₂ = 133.3atm

6 0

3 years ago

Write the formulas for the following compounds: (a) copper(l) cyanide, (b) strontium chlorite, (c) perbromic acid,(d) hydroiodic

Romashka [77]

Answer:

A. CuCN

B. Sr(OCl)2

C. HBrO4

D. HI

E. Na2NH4PO4

F. KH2PO4

G. IF7

H. P4S10

I. HgO

J. Hg2I2

K. SeF6

Explanation:

All have different valent cation and anions like mono di and poly valent ions

4 0

4 years ago

Which is having more bond order and what is the bond order in BF₃ and BF₄⁻ ?

il63 [147K]

The bond order of BF₄⁻ is 1 and the bond order of BF₃ is 1.33

So, BF₃ is having more bond order than BF₄⁻.

In other words, BF₃ > BF₄⁻ ( You can write Bond Order or in B.O it's the abbreviation of Bond Order ).

3 0

3 years ago

What mass of salt (NaCl) should you add to 1.46 L of water in an ice-cream maker to make a solution that freezes at -14.4 ∘C? As

Leya [2.2K]

Answer:

We should add 330.2 grams of NaCl

Explanation:

Step 1: Data given

Volume of water = 1.46 L = 1460 mL

Density of water = 1.00 g/ mL

The solution freezes at -14.4 °C

Kf = 1.86 °C / m

Step 2: Calculate molality

ΔT = i*Kf*m

⇒ with ΔT = The change in temperature = -14.4 °C

⇒ with i = The van't Hoff factor for NaCl = 2

⇒ with Kf = 1.86°C/m

⇒ with m = the molality = TO BE DETERMINED

m = ΔT / (i*Kf)

m = 14.4 / (2*1.86)

m =3.87 molal

Step 3: Calculate moles of NaCl

Molality = moles Nacl / mass Water

3.87 molal = moles NaCl / 1.46 kg

Moles NaCl = 3.87 * 1.46

Moles NaCl = 5.65 moles

Step4: Calculate mass of NaCl

Mass NaCl = Moles NaCl * molar mass NaCl

Mass Nacl =5.65 moles * 58.44 g/mol

Mass NaCl =330.2 grams

We should add 330.2 grams of NaCl

8 0

3 years ago