Draw the lewis structure for a hydrogen fluoride hf molecule

Answer:

.46 moles

Explanation:

PV = n RT      make sure you use the correct R = 8.31446  L-kPa/(K-mol)

36 * 38 = n * 8.31446 * (273.15 + 82)

n = .463 moles

Lewis acid and base are the chemical species that accept and donate pairs of electrons. Boron trifluoride, copper ion, and sulfur dioxide are lewis acids, and iodide ion and water are lewis bases.

Lewis acids are the chemical species that accept the nonbonding electron pair from other chemical species. Hence is an electron-pair acceptor. Boron trifluoride, copper ion, and sulfur dioxide are lewis acids as they can accept an electron to complete an octet.

Lewis bases are the chemical species that donate the non-bonding electron pair to the other chemical species. Hence is an electron-pair donor. Halogen or the iodide and water is a lewis base as it is an electron-rich species.

Therefore, water and iodide is lewis base.

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[tex]\sf\large \green{\underbrace{\red{Answer⋆}}}:[/tex]

0.250 moles

Explanation:

First we will convert quantity of solution into liters

[tex] \implies \sf 125 \: ml \times {10}^{ - 3} = 0.125 \: l[/tex]

Now we will use morality formula

[tex] \sf molarity = \frac{no \: of \: moles}{volume} \\ \\ \sf no \: of \: moles = molarity \times volume[/tex]

Here volume(quantity) = 0.125 l

AND no. of moles(given) = 2.0M

[tex] \sf \implies no \: of \: moles = 2 \times 0.125 \\ \\ \sf \implies no \: of \: moles = 0.250 \: moles \: of \: HCl[/tex]

[tex]~~~~~~w = \dfrac{SVM}{1000}\\\\\\\implies nM = \dfrac{SVM}{1000}\\\\\\\implies n= \dfrac{SV}{1000}\\\\\\\implies n = \dfrac{125 ~ \text{mL}\times 2.0~ \text{M}}{1000}\\\\\\\implies n = \dfrac{250}{1000}\\\\\\\implies n = 0.25~ \text{mol.}\\\\\text{The number of moles is 0.25.}[/tex]

Answer:

I beileve it is NORTH KOREA!! XD actually D.

Explanation:

Explanation:

Winter 4

Season when the northern hemisphere is tilted away from the sun.

Summer 2

Season when the northern hemisphere is tilted towards the sun.

Spring 1

Season when the northern hemisphere is neither tilted towards nor away from the sun; days getting longer and warmer.

Fall 3

Season in the northern hemisphere when the Earth is neither tilted towards nor away from the sun; days getting shorter and cooler.

Answer:

A !!

it a mix where everything is combined together

Answer:

Freezing point depression is a property of solutions where the solute lowers the normal freezing point of the solvent.

Answer:

50 kJ

Explanation:

Activation energy is the energy to go from reactants at 150  to   200 kJ

 = 50 kJ

The rank of the pressure from highest to lowest are c, 1.22 x 10⁵ Pa < a, 736 mm hg < b, 0.928 < d, 728 torrs.

The force applied perpendicular to any object is the pressure.

First, we convert all the quantities into atm.

1. 1 mmHg = 0.00131579atm/mmHg

736mmHg = 0.96843 atm

2. 1 torr = 0.00131578947 atm/ torr

728 torr = 0.9579 atm

3. 1 pascal = 9.87 x 10⁻⁶

1.12 x 00000pa = 1.105 atm

So given value in atm are-a) 96843 atm b) 0.98atm c) 0.9579 aim d) 1105 atm.

SO, the order will be c<a< b<d.

Thus, the  order will be c<a<b<d.

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Answer: Cohesion

Explanation: Because cohesion refers to the attraction of molecules for other molecules of the same kind, and water molecules have strong cohesive forces thanks to their ability to form hydrogen bonds with one another.

Answer:

3.12 L

Explanation:

Given the R value that is supplied

      you will need to convert to atm from mm Hg    and C  to K

269 mm / 760 mm/atm = .354 atm

176 c = 449.15

PV = n RT

V = n RT / P    = .03 * .08206 * 449.15  / .354 = 3.12 L

Answer:

Bubbles indicate change  

Explanation:

i don't know if i'm right but if im not its fine

Hope it helps<3

A reasonable synthetic strategy for the synthesis of e-6 methyl 3 heptene starting with 4 methyl 1 pentyne is proposed below.

The artificial execution of chemical reactions to obtain one or more products is known as chemical synthesis.

Synthetic strategy for the synthesis of e-6 methyl 3 heptene starting with 4 methyl 1 pentyne is shown in the image.

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Answer:

true

Explanation:

Because water has a ability to flow electricity through it

Explanation:

I think the answer is this for a better check mass- mass ratio in stoichiometry lesson

The percentage of magnesium chloride in the original mixture is 25.529 %.

Silver nitrate is an organic compound. It is used in treating wounds and infection of the skin.

A 1.0 g mixture of magnesium chloride and sodium nitrate.

The mass of the precipitate is 1.43 g.

Thus, the percentage of magnesium chloride in the original mixture is 25.529 %.

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The volume which is occupied by 0.445 mol of carbon dioxide at 397K and 973mmHg is 11.32 L.

Ideal gas equation will be represented as:

PV = nRT, where

P = pressure = 973 mmHg = 1.28 atm

V = volume = ?

n = moles = 0.445 mol

R = universal gas constant = 0.082 L.atm / K.mol

T = temperature = 397 K

On putting all these values, we get moles as:

V = (0.445)(0.082)(397) / (1.28) = 11.317 = 11.32 L

Hence required volume of gas is 11.32 L.

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The result of two alpha decay of Thorium 230 is Radon-222.

The radioactive decay results in the release of the subatomic particles resulting in reduction in the mass number by 4, and the atomic number by 2.

The result of alpha decay of thorium 230 is given as:

[tex]\rm ^{230}_{90}Th\;\rightarrow\;^{226}_{88}Ra\;+\;^{4}_{2}\alpha[/tex]

[tex]\rm ^{226}_{88}Ra\;\rightarrow\;^{222}_{86}Rn\;+\;^{4}_{2}\alpha[/tex]

The result of two alpha decay of Thorium 230 is Radon-222.

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Answer:

Some important achievements of chemistry includes discovery of oxygen ;Atomic Theory; Atoms Combine Into Molecules ;Synthesis of Urea; Chemical Structure ; Periodic Table of the Elements; Electricity Transforms Chemicals ; The Electron etc.

Chemistry is a field of science which deals with the chemicals present in laboratory or in our environment o related to human body also.

There are main 3 branches of chemistry that is organic and inorganic and physical chemistry some others are too like analytical chemistry ,industrial chemistry , pharmaceutical chemistry.

Organic chemistry deals with the carbon compounds and hydrogen compound inorganic chemistry deals with the elements of periodic table and pharmaceutical makes medicines for human health care. The reasons  for people to pursue discoveries in chemistry because it is the most important part of  daily life and related to the human health too.

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The complete question

Mention some important achievements of chemistry

Answer:

13 %

Explanation:

(50 g) / (50 + 336 g) = .1295       or  13 %

When a strong acid such as HCl is added to the carbonic acid buffer system, more carbonic acid is formed.

A buffer system prevent the pH change and resist it when an acid or base is added to the solution.

A buffer system is prepared by weak acid or weak base and their salts. There are three types of buffer system present.

Thus, the correct option is b. More carbonic acid is formed.

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Answer:

C. Condensation

Explanation:

When molecules release heat energy, it is called exothermic. In this case, condensation would be an example of this.

Answer: it is C condensation

Explanation: I took the quiz

Hope this helps

Hane a nice day

Could you mark me as branly if you could thank you :)

Answer:

given statement is completely true

e.g . water H2O

Answer:

True

Explanation:

Water is amphoteric, which means it can act as both a Braonsted-Lowry acid and a Bronsted-Lowry base. Strong acids and bases ionize completely in aqueous solution, while weak acids and bases ionize only partially. The conjugate base of a Brønsted-Lowry acid is the species formed after an acid donates a proton.

Answer:

If I understood correctly, your answer should be 0.64 grams

Explanation:

The amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.

The term radioactivity has to do with the spontaneous disintegration of a substance.

To determine the mass of the K-42 that remains, we must have the half life of the isotope or the decay constant and both information are missing.

However, the amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.

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Answer:

Quarts of blood = 72000

Quarts of urine = 720

Explanation:

Here, we know that

1 year = 365 days

For blood

200 × 365 = 72000

For urine

2 × 365 = 720

Thus, The average person's kidney filters 72000 quarts of blood and 720 quarts of urine.

Answer:

X is an element in period 3 with two electrons in the outer shell