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REY [17]
3 years ago
8

A particular element has the following set of properties:

Chemistry
1 answer:
vaieri [72.5K]3 years ago
8 0

Answer:

A. Iodine

Explanation:

First 2 points describe it's physical properties. Even if we don't remember them, we can easily figure out the answer to be a non-metal. As, non-metals usually have lower bp and mp than metals.

Both Iodine and hydrogen exists as a 2 atom molecule in gas phase.

But only elements of group 17 (halogens) have 7 electrons in their outer shell.

Again, salts are usually ionic compounds, formed by atoms with a greater difference in their electronegativities. Hence, the one that forms bonds with a metal to form a salt readily can be a non- metal.

All these points indicate that the element must be iodine.

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Tris is a weak base. The basic form of tris can be written tris0 and the protonated (conjugate acid) form can be written tris. T
Arada [10]

Answer:

a) [Tris0] : [Tris] = 1 : 100

b) Range = 7.1 to 9.1

Explanation:

a) Calculation of ratio of the basic and the acidic forms of tris

pH of a buffer is calculate using Henderson-Hasselbalch equation

pH = pKa+log\frac{Salt}{Acid}

Conjugate acid of Tris dissociated as

Tris \leftrightharpoons Tris0 + H^+

For tris,

Salt or Basic form = tris0

Acid or Acidic form = Tris

pKa = 8.1

pH = 6.1

pH = pKa+log\frac{Tris0}{Tris}

6.1 = 8.1+log\frac{Tris0}{Tris}

log\frac{Tris0}{Tris} = -2

\frac{Tris0}{Tris} = antilog (-2)

\frac{Tris0}{Tris} = 10^{-2}

[Tris0] : [Tris] = 1 : 100

b) Range of Tris

Range of any buffer is:

From (pKa -1) to (pKa+1)

So, range of Tris is:

From (8.1 - 1) to (8.1 +1)

or from 7.1 to 9.1

8 0
3 years ago
A full moon occurs when.??
Kamila [148]

Answer:

A full Moon occurs when the Moon appears as a complete circle in the sky. ... If the Moon is between the Earth and the Sun in its orbit, then the back side of the Moon is lit up and the side facing the Earth is in darkness.

Explanation:

3 0
3 years ago
Which of the following is not a type of biomolecule?
Degger [83]

Answer:

Nucleic acids are not considered nutrients. There are thousands of different types of molecules in a cell, but there are only four major classes of biomolecules. These are carbohydrates, lipids, proteins, and nucleic acids. Carbohydrates are compounds such as sugars and starches

Explanation:

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9L!!! You take the moles of N2 in the reaction and then divide by one mole of nitrogen. Then you multiply that by the number of hydrogen moles in the reaction which in this case is 3. This gives you an answer of 3. You then take the number of hydrogen moles and multiply it by the 3L giving you 9L of hydrogen.
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Aloiza [94]

Answer:

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Explanation:

i hope this helps

7 0
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