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3 years ago

Why there is a dip in electronegativity for the elements Mn and Zn?

1 answer:

7 0

Among the transition metal elements, Manganese and Zinc have a slight lowering of electronegativities. The reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. Both Manganese and Zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. Although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. Hence, the electronegativity (or the ability to attract electrons) is lessened.

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3.14 What is this in scientific notation

Molodets [167]

= 3.14 × 10 with the power of 0
(scientific notation)

= 3.14e0
(scientific e notation)

= 3.14 × 100
(engineering notation)
(one)

= 3.14
(real number)

3 0

3 years ago

List the objects from the smallest to the largest mass.

ddd [48]

i need help ls i thank its book 500 grams

3 0

3 years ago

One of relatively few reactions that takes place directly between two solids at room temperature is In this equation, the in Ba(

yuradex [85]

Answer:

3.14 grams of ammonium thiocyanate must be used to react completely with 6.5 g barium hydroxide octahydrate.

Explanation:

$Ba(OH)_2.8H_2O(s)+NH_4SCN(s)\rightarrow Ba(SCN)_2(s)+8H_2O(l)+NH_3(g)$

The balance chemical equation is :

$Ba(OH)_2.8H_2O(s)+2NH_4SCN(s)\rightarrow Ba(SCN)_2(s)+10H_2O(l)+2NH_3(g)$

Mass of barium hydroxide octahydrate = 6.5 g

Moles of barium hydroxide octahydrate = $\frac{6.5 g}{315 g/mol}=0.020635 mol$

According to reaction, 2 moles of ammonium thiocyanate reacts with1 mole of barium hydroxide octahydrate. The 0.020635 moles of barium hydroxide octahydrate will react with:

$\frac{2}{1}\times 0.020635 mol=0.04127 mol$

Mass of 0.04127 moles of ammonium thiocyanate;

$0.04127 mol\times 76 g/mol=3.136 g\approx 3.14 g$

3.14 grams of ammonium thiocyanate must be used to react completely with 6.5 g barium hydroxide octahydrate

3 0

4 years ago

A piece of lithium is placed on the surface of some water in a beaker. hydrogen is given off. Lithium hydroxide is formed. What

Gala2k [10]

A piece of lithium is placed on the surface of some water in a beaker. Hydrogen is given off and Lithium hydroxide is formed. The word equation would be as follows:


lithium + water→ lithium hydroxide + hydrogen

Hope this answers the question. Have a nice day.

8 0

3 years ago

What is the velocity of a 0.5-kg ball that has a momentum of 3 kg.m/s?

maria [59]

Answer:

6m/s

Explanation:

Data obtained from the question include:

Mass = 0.5kg

Momentum = 3 kg.m/s

Velocity =.?

Momentum is simply the product of mass and velocity as shown by the equation below:

Momentum = Mass x Velocity

Velocity = Momentum /mass

Velocity = 3kg.m/s / 0.5kg

Velocity = 6m/s

Therefore, the velocity of the ball is 6m/s

3 0

3 years ago