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Leona [35]
3 years ago
14

Why does atomic size tend to decrease with increasing atomic number across a row of the periodic table?

Chemistry
1 answer:
k0ka [10]3 years ago
7 0

Answer:

Because of greater nuclear attraction on valance shell.

Explanation:

The atomic size tend to decrease in same period of periodic table with increase of atomic number 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 with increase of atomic number in period.

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Explain why are all valence electrons are either in an s or p orbital.
ahrayia [7]

They are two representatives of the sublevels/energy levels.

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2. Explain Charles law in terms of the kinetic<br> molecular theory?
Alina [70]

Answer:

Explanation:

Charles law states that "the volume of a fixed mass of gas varies directly as its absolute temperature if the pressure is constant".

This law is a derivative of the kinetic molecular theory of gases.

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  • When gases are heated the average kinetic energy of the molecules increases.
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3 years ago
How many moles are dissolved in 1.5 L of a 5.7 M solution?
Scrat [10]

Answer:

8.55 moles

Explanation:

The formula for calculating molarity is moles of solute divided by liters of solution. In this case:

5.7=\frac{x}{1.5}

x=5.7\cdot 1.5=8.55 moles. Hope this helps!

4 0
3 years ago
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Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid. MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O(l)
Marina CMI [18]

Answer:

Please see the complete formt of the question below

Chlorine gas can be made from the reaction of manganese dioxide with hydrochloric acid.

MnO₂(s) + HCl(aq) → MnCl₂(aq) + H₂O(l) + Cl₂(g)

According to the above reaction, determine the limiting reactant when 5.6 moles of MnO₂ are reacted with 7.5 moles of HCl.

The answer to the above question is

The limiting reactant is the MnO₂

Explanation:

To solve this,  we note that one mole of MnO₂ reacts with one mole of HCl to produce one mole of MnCl₂, one mole of H₂O and one mole of Cl₂

Molar mass of MnO₂ = 86.9368 g/mol

Molar mass of HCl = 36.46 g/mol

From the stoichiometry of the reaction, 5.6 moles of MnO₂ will react with 5.6 moles of HCl to produce 5.6  moles of H₂O and 5.6 moles of Cl₂

However there are 7.5 moles of HCL therefore there will be an extra 7.5-5.6 or 1.9 moles of HCl remaining when the reaction is completed

7 0
3 years ago
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