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3 years ago

What values do you estimate for Zeff using Slater's rules?

Chemistry

1 answer:

devlian [24]3 years ago

5 0

Answer:

valence electrons, thereby "negating" some of the attractive force from the positive nucleus. Electrons really close to the atom (n-2 or lower) pretty much just look like protons, so they completely negate. As electrons get closer to the electron of interest, some more complex interactions happen that reduce this shielding.

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What’s the effect of drinking on the digestive system?

AveGali [126]

Alcohol consumption can damage the digestive system and can increase the risk of alcohol-caused cancer and liver disease.

3 0

3 years ago

A solution is prepared by dissolving 318.6 g sucrose (C12H22O11) in 4905 g of water. Determine the molarity of the solution

alexandr1967 [171]

The molarity of sucrose solution is 0.19 M.

The molarity of HCl is 12.8 M.

<u>Explanation:</u>

a. Molarity can be found by finding its moles and volume of water in L and then dividing both(moles divided by volume in Litres).

Mass of sucrose = 318. 6 g

Molar mass of sucrose = 342.3 g/mol

Moles = $$\frac{mass}{molar mass}$

= $$\frac{318.6 g}{342.3 g/mol}$

= 0.93 moles

Mass of water = 4905 g

Density of water = 1000 g/L

Volume = $$\frac{mass}{density}$

= $$\frac{4905 g }{1000 g/L}$

= 4.905 L

Now we can find the molarity = $$\frac{moles}{Volume(L)}$

= $$\frac{0.93 moles}{4.905 L}$

= 0.19 M

So the molarity of sucrose solution is 0.19 M.

b. The molarity of HCl can be found as follows.

It is given that 39% HCl that means it contains 39 g of acid in 100 g of water.

Density of the solution is 1.20 g/mL, from this mass can be found as,

$$\frac{1 L \times 1000 mL \times 1.20 g}{1 L \times 1 mL}$

= 1200 g

Now we have to find out the amount of HCl in grams as,

$$\frac{1200g \times 39 g HCl }{100 g solution}$

= 468 g HCl

Now we have to find the number of moles,

moles = $$\frac{468 g}{36.46 g/mol}$

= 12.8 moles

Molarity of HCl = $$\frac{12.8 moles}{1 L }$

= 12.8 M

So the molarity of HCl is 12.8 M.

6 0

3 years ago

You double the partial pressure of a gas over a liquid at constant temperature. Which of these statements is then true? a. The H

natka813 [3]

Answer: Option (e) is the correct answer.

Explanation:

According to Henry's Law, mass of a gas which will dissolve into a solution is directly proportional to the partial pressure of that gas above the solution.

Mathematically, C = $k_{H} \times P$

where, $k_{H}$ = Henry's constant

P = partial pressure

Since, concentration is directly proportional to partial pressure of a gas. Hence, more is the partial pressure more will be the number of molecules present in the liquid.

Thus, we can conclude that the statement there are twice as many gas molecules in the liquid, is true.

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3 years ago

Surfers put wax on their boards to reduce friction between the

Advocard [28]

Answer:

ESurfboard wax (also known as surfwax) is a bodyboard, or skimboard, to keep the surfer from slipping off the board when paddling out or riding a wave. It is also used to increase grip on the paddle of a dragon boat or surf board.

idk if that is what your looking for.

5 0

3 years ago

The air you breathe is made of 21% oxygen and 78% nitrogen. The oxygen in air is the _____ and the nitrogen is the _____.

jarptica [38.1K]

The answer is solute, solvent

<span>In a solution, a solute the component which is present in lesser amount while a solvent is present in greater amount. </span>Since nitrogen is present in a greater amount than oxygen (78% > 21%), then the oxygen must be the solute and the nitrogen must be the solvent in the air.

5 0

3 years ago