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3 years ago

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Unless otherwise instructed, you may refer to the periodic table in the Chemistry: Problems and Solutions book for this question

. Sodium, potassium, and cesium belong to which group? alkali metals alkaline earth metals halogens inner transition metals

1 answer:

FromTheMoon [43]3 years ago

3 0

Answer:dlobay

Explanation:dncidw

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During protein synthesis, the covalent bond between amino acids is formed by the process of _____.

kati45 [8]

Dehydration synthesis

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4 years ago

What mass of sucrose (C12H22O11) should be combined with 546 g of water to make a solution with an osmotic pressure of 8.80 atm

lesya [120]

<u>Answer:</u> The mass of sucrose required is 69.08 g

<u>Explanation:</u>

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

$\pi=iMRT$

Or,

$\pi=i\times \frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}\times RT$

where,

$\pi$ = osmotic pressure of the solution = 8.80 atm

i = Van't hoff factor = 1 (for non-electrolytes)

Mass of solute (sucrose) = ?

Molar mass of sucrose = 342.3 g/mol

Volume of solution = 564 mL (Density of water = 1 g/mL)

R = Gas constant = $0.0821\text{ L.atm }mol^{-1}K^{-1}$

T = Temperature of the solution = 290 K

Putting values in above equation, we get:

$8.80atm=1\times \frac{\text{Mass of sucrose}\times 1000}{342.3\times 546}\times 0.0821\text{ L.atm }mol^{-1}K^{-1}\times 290K\\\\\text{Mass of sucrose}=\frac{8.80\times 342.3\times 546}{1\times 1000\times 0.0821\times 290}=69.08g$

Hence, the mass of sucrose required is 69.08 g

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3 years ago

What is the "magic number' of valence electrons? How does this influence the type of bonds formed by various combinations of

svp [43]

Magic number is any number in electron shells that suggest stability. It corresponds to total number of electrons in filled electron shells.

If an electron is having magic number, then it forms stable bonds.

Explanation:

The magic numbers are 2,10,18,36,54, 86 and 126. This refers to the total number of electrons that an electron can have when it is completely filled.

Atomic nuclei which carries either of these nucleons have high binding energy as compared to others. Hence, they have high stability. Bonds in such elements are more strong.

Radioactive decay of such elements is very slow.

Eugene Winger coined the term "magic number".

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3 years ago

When Na forms an ion it loses its outer electron to become Na+. Write the electron configuration for Na and Na+. What element do

Otrada [13]

Answer:

Na: 1s2 2s2 2p6 3s1

Na+: 1s2 2s2 2p6

Na+ electronic configuration resemble that of Neon( 1s2 2s2 2p6)

In general, the electronic configuration of alkali metals ions resemble that of the group zero (noble gas)

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4 years ago

Hey so i dont get this help please

Leya [2.2K]

Answer:

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Explanation:

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3 years ago