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faust18 [17]
3 years ago
10

Two amino acids frequently found in reverse turns are a. glycine and proline b. tyrosine and tryptophan c. leucine and isoleucin

e d. serine and threonine
Chemistry
2 answers:
Crank3 years ago
8 0

Answer:

A

Explanation:

Polypeptides such as proline and glycine are capable of making a sharp turn called a reverse turn due to the suitability and flexibility of their cyclic structure

Tresset [83]3 years ago
3 0

Answer:

A.

Explanation:

Glycine and Proline are important.

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An iron block of mass 18 kg is heated from 285 K to 318 K. If 267.3 kJ is required, what is the specific heat of iron? A. 450.00
valkas [14]

Answer:

  • <u>Option A. 450.00</u>

Explanation:

<u>1) Data:</u>

a) m = 18 kg

b) T₁ = 285 K

c) T₂ = 318 K

d) Q = 267.3 kJ

e) S = ?

<u>2) Principles and equations</u>

The specific heat of a substance is the amount of heat energy absorbed to increase the temperature of certain amount (gram, kg, or moles, depending on the definition or units) of the substance in 1 ° C or 1 K.

The mathematical relation between the specific heat and the heat energy absorbed is:

  • Q = m × S × ΔT

Where,

  • Q is the heat absorbed,
  • S is the specific heat, and
  • ΔT is the temperature increase (T₂ - T₁)

<u>3) Solution:</u>

<u>a) Substitute the data into the equation:</u>

  • 267.3 kJ = 18 kg × S × (318 K - 285 K)

<u>b) Solve for S and compute:</u>

  • S = 267.3 kJ / (18 kg × 33 K) = 0.45 kJ / (Kg . K)

The options have not units, but I notice that the first answer is 1,000 times the answer I obtained, so I will make a conversion of units.

<u>c) Convert to J /( kg . k):</u>

  • 0.45 kJ / (Kg . K) × 1,000 J / kJ = 450 J / (kg . K)

Now we can see that the option A is is the answer, assuming the units.

6 0
3 years ago
777 Joules of energy are applied to 25.0 grams of each of the following materials, which
4vir4ik [10]

Answer:

I think copper

Explanation:

Material IACS % Conductivity

Silver                105

Copper            100

Gold               70

Aluminum         61

Nickel              22

Zinc                          27

Brass                  28

Iron                        17

Tin                      15

Phosphor Bronze  15

Lead                      7

Nickel Aluminum Bronze 7

Steel                   3 to 15

the table might help- your indian brother

3 0
2 years ago
What is the relationship between the kinetic energy of molecules in an object and the object's temperature?
Gennadij [26K]

Answer:

Explanation:

Temperature measures the average kinetic (or motion) energy of the particles within a substance.

6 0
3 years ago
What is the volume of 60 g of ether if the density of ether is 0.70g/mL
miss Akunina [59]

Answer:

114mL.

Explanation: hope this helped

8 0
3 years ago
Which of the following describes the expected solubility of benzoic acid?
Igoryamba
I because it is an acid, it should be soluble in hexane
6 0
3 years ago
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