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2 years ago

8

How does electronegativity change going down and across the periodic table?

2 answers:

postnew [5]2 years ago

8 0

Answer:

On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Explanation:

velikii [3]2 years ago

4 0

Answer:

on the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Explanation:

hope this helps!

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A beaker containing 6.32 moles of PBr3, contains___

NISA [10]

Answer:

3.8 x 10²⁴molecules

Explanation:

Given parameters:

Number of moles = 6.32moles

Unknown:

Number of molecules = ?

Solution:

The number of moles can be used to derive the number of molecules found within a substance.

Now,

1 mole of substance contains 6.02 x 10²³ molecules

6.32 mole of PBr₃ will contain 6.32 x 6.02 x 10²³ = 3.8 x 10²⁴molecules

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3 years ago

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Answer:

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3 years ago

The equation K2O represents the ionic bond between potassium and oxygen. What is the name of the compound?

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3 years ago

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If you have 250 mL of 0.75 M LINO2.<br> How many grams of this substance<br> would you have?

Vesna [10]

Mass of this substance = 9.928 g

<h3>Further explanation</h3>

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

$\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}$

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

$\boxed{\bold{n=V\times M}}$

mol of substance -Lithium nitrite - LiNO₂ :

V = 250 ml = 0.25 L

M = 0.75 M

$\tt n=0.25\times 0.75=0.1875$

So mass of this substance - LiNO₂ (MW=52,947 g/mol) :

$\tt mass=mol\times MW\\\\mass=0.1875\times 52,947 g/mol\\\\mass=9.928~g$

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3 years ago

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postnew [5]

It is a column of elements in the periodic table of the chemical elements.

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3 years ago