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3 years ago

How many different kinsds of polypeptides, each composed of 12 amino acids, could be synthesized using 20 common amino acids?

Chemistry

1 answer:

Dominik [7]3 years ago

8 0

the answer answer is 20122012.

However, I disagree. This result distinguishes the following two polypeptides even though they are exactly the same polypeptide:

(Met)x11-Glu

and

Glu-(Met)x11

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A. Use the words below to complete the sentences.

lutik1710 [3]

Its Concentration, diffusion, a selectively Premable membrane, osmosis,diffusion, a selectively permeable membrane, osmosis, and diffusion

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3 years ago

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What is the net ionic equation for the precipitation reaction between bacl2 and na2so4? a bacl2(aq + na2so4(aq ? baso4(s + 2nacl

Ugo [173]

BaCl₂(aq) + Na₂SO₄(aq) = BaSO₄(s) + 2NaCl(aq)

Ba²⁺(aq) + 2Cl⁻(aq) + 2Na⁺(aq) + SO₄²⁻(aq) = BaSO₄(s) + 2Na⁺(aq) + 2Cl⁻(aq)

Ba²⁺(aq) + SO₄²⁻(aq)= BaSO₄(s)

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3 years ago

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What type of energy is produced by a drycell?

anyanavicka [17]

Electrical energy is produced by dry cell. Hope that helps.

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4 years ago

Choose the molecule or compound that exhibits dipole-dipole forces as its strongest intermolecular force. a) BCl3 b) N2 c) H2 d)

Nana76 [90]

Answer:

SO₂

Explanation:

The dipole-dipole force is not only determined by the electron density around each atoms in the molecule (dependent of electronegativity difference), but also how the atoms in the molecules are arranged. In general, the more symmetric a molecule is, the less dipole force it exerts as each dipole moments cancels each other out.

Now let's examine each answer

b and c, N₂ and H₂ are composed of same type of atoms, therefore, no dipole moment occurs, and no dipole-dipole forces are exerted
a and e, BCl₃ and CBr₄ are composed of atoms with different electronegativity, but are symmetric. With BCl₃ having trigonal planar structure and CBr₄ has tetragonal structure, each B-Cl and C- Br bond cancels out each other dipole moment, and thus, no dipole moments were generated.
d, SO₂ structure is not linear, but is a little bent, this allows net dipole moment to occurs in this molecule as dipole moment from each S=O bond do not cancels each other out

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3 years ago

Solving stoichiometry problems that involve mass Now that you know the molar masses of the relevant compounds, you are ready to

Shalnov [3]

14.85 g of water

Explanation:

Calculate the mass of water produced when 9.56 g of butane reacts with excess oxygen.

Here we have the full oxidation of butane (C₄H₁₀) which produce carbon dioxide and water.

C₄H₁₀ + (13/2) O₂ → 4 CO₂ + 5 H₂O

number of moles = mass / molecular weight

number of moles of butane = 9.56 / 58 = 0.165 moles

Now, taking in account the chemical reaction, we devise the following reasoning:

if 1 mole of butane produces 5 moles of water

then 0.165 moles of butane produces X moles of water

X = (0.165 × 5) / 1 = 0.825 moles of water

mass = number of moles × molecular weight

mass of water = 0.825 × 18 = 14.85 g

Learn more about:

oxidation of hydrocarbons

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4 0

3 years ago