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3 years ago

Which of the following correctly compares the radii of Cl and Cl−?

Chemistry

1 answer:

nignag [31]3 years ago

7 0

Answer:

Cl has a smaller radius than Cl− because Cl− has an expanded electron cloud.

Explanation:

Definition of atomic radii:

The atomic radius is the distance between center of two bonded atoms.

Trend along period:

As we move from left to right across the periodic table the number of valance electrons in an atom increase.The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases.

Trend along group:

In group by addition of electron atomic radii increase from top to bottom due to increase in atomic number and addition of extra shell.

In this way Cl⁻ will have the largest atomic radii because one extra electron is added and electronic cloud more expanded as compared to neutral atom.

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Determine the empirical formula for a compound that is 36.86% n and 63.14% o by mass. determine the empirical formula for a comp

nexus9112 [7]

Mass of nitrogen = 14.0067
 Mass of oxygen = 15.9994
In this compound nitrogen = 36.86 / 14.0067 = 2.63
And oxygen = 63.14 / 15.9994 = 3.95 
now we have: N----- 2.63 and O----3.95
by dividing both with the smallest number we get
 N-------2.63/2.63 = 1
O-------3.95/2.63 = 1.5
To get whole numbers we multiply both by 2
 N= 1 x 2 = 2 And O = 1.5 x 2= 3
So, the empirical formula is N₂O₃.

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3 years ago

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kvv77 [185]

Answer:

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Explanation:

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3 years ago

a laboratory procedure calls for making 510.0 mL of a 1.6 M KNO3 solution. How much KNO3 in grams is needed

barxatty [35]

Answer:

82.416 g of KNO ₃ is needed to produce 510.0 mL of a 1.6 M KNO ₃ solution.

Explanation:

Since molarity is the number of moles of solute that are dissolved in a given volume, calculated by dividing the moles of solute by the volume of the solution, the following rule of three can be applied: if in 1 L (1,000 mL) of KNO₃ there are 1.6 moles of the compound present, in 510 mL how many moles will there be?

$moles=\frac{510 mL*1.6 moles}{1000 mL}$

moles= 0.816

Being the molar mass of the elements:

K: 39 g/mole
N: 14 g/mole
O: 16 g/mole

So the molar mass of the compound KNO₃ is:

KNO₃= 39 g/mole + 14 g/mole + 3*16 g/mole= 101 g/mole

Now I can apply the following rule of three: if in 1 mole of KNO₃ there are 101 g, in 0.816 moles how much mass is there?

$mass=\frac{0.816 moles*101 grams}{1 mole}$

mass= 82.416 grams

82.416 g of KNO ₃ is needed to produce 510.0 mL of a 1.6 M KNO ₃ solution.

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2 years ago

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Len [333]

Answer:

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3 years ago

If a solution conducts electricity and has a pH value of 7 then it could be

stealth61 [152]

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3 years ago