If you knew the number of valence electrons in a nonmetal atom, how would you determine the valence of the element?

Answers

Answer 1

Answer: Usually, the group number of the element would tell you the amount of valence electrons. In an element, their needs to be a full octet in order for it to be stable (aka happy element). Octet means 8 valence electrons in its orbital.

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What is the total number of moles of solute in 250 milliliters of a 1.0 M solution of NaCl

How does the degree of disorder of a gas compare to that of a liquid or a solid? please explain your answer. this is a chemistry home work.

Answers

Molecules of gases are spaced far apart from each other compared to liquids and solids. This results in greater disorder in gas molecules. Liquid molecules are spaced slightly closer together than gas molecules, so the disorder is less than gas molecules. Solid molecules are the most tightly packed, and often vibrate in position. This gives solid molecules the least disorder.

50 grams of acetic acid C2H4O2 are dissolved in 200 g of water. Calculate the weight % and mole fraction of the acetic acid in the solution

Answers

$50g$ $of$ $C_2H_4O_2$ $in$ $200g$ $H_2O$

so:

$(50)/(200+50)+100\%= (50*100)/(250)\%=20\%$

$MW of acid = 2*C+4*H+2*O = 2*12+4*1+2*16=$

$=24+4+32=60g/mol$

so:

$(50g)/(60g/mol)\approx0.83moles$

it means that

in $50g$ of acid there is $\approx0.83$ moles of acid

$MW of H_2O = 2*H+O=2*1+16=2+16=18g/mol$

so:

$(200g)/(18g/mol)\approx11.11moles$

it means that:

in $200g$ of water there is $\approx11.11$ moles of water

therefore:

$(0.83mol)/(11.11mol+0.83mol)= (0.83mol)/(11.94mol)=0.069$

So your answers are:

$20\%$

and the mole fraction is:

$0.069$

A geographical area where plants, animals, the landscape and the climate all interact together is called a(n)environment.
ecosystem.
biome.
food web.

Answers

It's ecosystem :)
noun: eco-systemsa biological community of interacting organisms and their physical environment.

The Brønsted-Lowry theory defines an acid as a(n)a. hydrogen ion donor.
b. hydrogen ion acceptor.
c. electron-pair donor.
d. electron-pair acceptor.

Answers

Letra A. Doador de H+

The first person to use the term "atom" was _____. Dalton Democritus Aristotle the Egyptians

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the term atom comes from Greek. Democritus was the first person to use the name.

Democritus. Is. The. Correct. Answer I. Hope this will be helpful

Sodiun atom, potassium atom, and cesium atoms have the same ?

Answers

Answer:

They have similar chemical properties

Explanation:

Hi, those elements all belong to the Group I of the periodic table meaning that they share not only similar electronic configuration (1 electron of valence) but also they have similar chemical properties, being those more marked the higher the atomic number.

An example of that shared properties is that all of them react violently with water, being cesium the most violent.

sodium atom , potassium atom and cesium atom have the same group number which is group 1

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Which of the following aqueous solutions would have the greatest freezing-point depression?(A) 0.10 m (NH₄)₂SO₄ (B) 0.10 m MnSO₄ (C) 0.10 m NaF (D) 0.10 m KCI (E) 0.10 m CH₃OH

I REALLY NEED HELP WITH THIS CHEMESTRY PROJECT. I DO NOT UNDERSTAND ANYTHING OF THIS. CAN YOU GUYS PLZ HELP ME?Problem: You and your team work at Southern Nevada Water Authority and have been given the job of managing fluoride levels for the municipal water system. Today, you will need to measure the mass of the mineral sample fluorite (chemically, CaF2). Use this sample to determine how much water must be added to yield a 1 ppm fluoride solution. Your supervisor is requesting tanker trucks to bring the excess water. He needs to know how many tanker trucks to request and the total cost.Notes: 1 mol CaF2 = 78.08 g CaF2 = 6.02 x 1023 molecules of CaF21 molecules of CaF2 = 2 atoms of F1 mol H2O = 18 g H2O Density of water is 1 g/mL1000 mL = 1 L and 3.78 L = 1 gallonmass of sample of CaF2 = 287.185 g1 part per million = 1 atom of fluorine per 999,999 water molecules. 1 truck can carry 12,800 litters of water at a cost of $2,852.42 dollars.Before you begin mixing a solution of fluorite and water your team must first calculate the amount of water you will need. Your team will create a presentation that will show all of the necessary calculations to ensure that the greater Las Vegas area will have cavity free teeth. The presentation should include the following information:- Draw a diagram that points out the basic design of the water system and transport.- Demonstrate the following calculations (a) Calculate how many moles of mineral fluorite (CaF2) are in you sample. (b) Calculate the number of fluorine atoms in the sample of the mineral fluorite (CaF2). (b) Calculate how many molecules of water you will need. (c) Calculate the number of gallons of water that are needed to dissolve a 287.185 gram sample of fluorite to yield 1ppm solution.(e) How many trucks will be needed? Show your calculations!(f) what is will be the total cost?- Bonus points for creativity or “WOW” factor (i.e. pictures, color, neatness)!

The quantum mechanical model of the atom

Particles are arranged in a crystal structure in a sample of:a) H2 (g)b) Br2 (L)c) Ar (g)d) Ag (s)