How are an atoms chemical properties determined?

A system that does no work but that transfers heat to the surroundings has

ASHA 777 [7]

Answer:

answer is attached by me

Explanation:

hope it helps you

7 0

3 years ago

What is one product of a condensation reaction between two amino acids, such as glycine and alanine?

Ipatiy [6.2K]

Answer:

Gly-Ala

(Dipeptide).

Explanation:

A condensation reaction is a reaction in which two molecules combine to form a single molecule with the loss of a small molecule e.g water.

When two amino acids, such as alanine and glycine react, they yield a mixture of dipeptides (via dipeptide bond) and water. That is, The −OH from the carboxyl group (-COOH) of one amino acid combines with a hydrogen atom from the amine group (-NH2) of the other amino acid to produce water.

3 0

4 years ago

Enough of a monoprotic acid is dissolved in water to produce a 0.0165 m solution. the ph of the resulting solution is 2.68. calc

Dmitrij [34]

Answer is: Ka for the monoprotic acid is 3.03·10⁻⁴.

Chemical reaction: HA(aq) ⇄ A⁻(aq) + H⁺(aq).
c(monoprotic acid) = 0.0165 M.
pH = 2.68.
[A⁻] = [H⁺] = 10∧(-2.68).
[A⁻] = [H⁺] = 0.00209 M; equilibrium concentration.
[HA] = 0.0165 M - 0.00209 M.
[HA] = 0.0144 M.
Ka = [A⁻]·[H⁺] / [HA].
Ka = (0.00209 M)² / 0.0144 M.
Ka = 0.000303 M = 3.03·10⁻⁴ M.

3 0

4 years ago

How many mols are in 151 g of dinitrogen monoxide?

oksano4ka [1.4K]

Answer:

3.43 moles

Explanation:

To convert moles into grams you must take the number of grams and divide it by the atomic mass of the compound.

in this case, grams is 151 and N2O has an atomic mass of 44.013

so your equation would look like

151/44.013=3.430804535

your answer would be 3.43 moles

8 0

3 years ago

In modeling solid-state structures, atoms and ions are most often modeled as spheres. A structure built using spheres will have

Sav [38]

There are 2 atoms in each unit cell. The volume of 1 unit cell is 30.4 Å³. The volume of each atom is 10.3 Å³. The volume of atoms in the cell is 20.6 Å³. The packing efficiency of the solid is 67.8 %.

(a) How many total atoms are there in each unit cell?

In body centered cubic cells, there are 2 atoms, 1 in the center and 1 resulting from the sum of the 1/8 atom of each of the 8 corners.

$N = 1 + 1/8 \times 8 = 2$

(b) What is the volume of one unit cell in Å³?

Since the cell is a cube with a side of 3.12 Å (s), we can calculate its volume (V) using the following expression.

$V = s^{3} = 3.12^{3} = 30.4 A^{3}$

(c) Assuming that the atoms are spheres and the radius (r) of each sphere is 1.35 Å, what is the volume of one atom in Å³?

We will use the following expression for the volume of the sphere.

$V = \frac{4}{3} \times \pi \times r^{3} = \frac{4}{3} \times \pi \times (1.35A)^{3}=10.3 A^{3}$

(d) Therefore, what volume of atoms are in one unit cell?

There are 2 atoms in the unit cell, each one with a volume of 10.3 Å³.

$2 \pi 10.3 A^{3} = 20.6 A^{3}$

(e) Based on your results from parts (b) and (d), what is the packing efficiency of the solid expressed as a percentage?

The volume of 1 unit cell is 30.4 Å³ and the volume occupied by atoms in the cell is 20.6 Å³. The packing efficiency of the solid is:

$E = \frac{20.6A^{3} }{30.4A^{3}} \times 100\% = 67.8\%$

There are 2 atoms in each unit cell. The volume of 1 unit cell is 30.4 Å³. The volume of each atom is 10.3 Å³. The volume of atoms in the cell is 20.6 Å³. The packing efficiency of the solid is 67.8 %.

Learn more: brainly.com/question/3037904

4 0

3 years ago