A
is often written as an if/then statement.
O prediction
O law
O theory
O guess

Answer:

0.0069 mol

Explanation:

Given data:

Temperature = 25°C

Volume of gas = 0.044 L

Pressure of gas = 3.81 atm

Number of moles of gas = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

25+273 = 298 K

3.81 atm × 0.044 L = n × 0.0821 atm.L/ mol.K  ×  298 K

0.17  atm.L = n ×24.47 atm.L/ mol

n = 0.17  atm.L/24.47 atm.L/ mol

n = 0.0069 mol

The moles of gas has a pressure of 3.81 atm and volume 0.044 L has been 6.85 mmol.

The gas has been exhibiting the ideal nature. According to the ideal gas equation:

PV =nRT

P = pressure = 3.81 atm

V = volume = 0.044 L

R = constant = 0.0821

T = temperature = 25 [tex]\rm ^\circ C[/tex] = 298 K

Substituting the value:

3.81 [tex]\times[/tex] 0.044 = n [tex]\times[/tex]  0.0821 [tex]\times[/tex]  298

0.16764 = 24.4658 n

n = 0.00685 mol

n = 6.85 mmol

The moles of gas has a pressure of 3.81 atm and volume 0.044 L has been 6.85 mmol.

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Answer:

Hydrates! :D

Explanation:

Answer:

if you are working with a substances that produce or generate toxic or harmful fumes, vapours, gases, dust or chemical aerosols

it should be carried out in a fume cupboard to eliminate or reduce the risk of exposure to an acceptable and safe level.

I hope it'll help

thanks...

Answer:

20g

Explanation:

14g+6g=20g

Answer:

elimination:it is the act of discharging or excreting waste product from body is elimination.

substitution:the act/action of replacing someone or something with another person or thing.

Answer:

Emission spectra may be used in studying stars in order to determine what atoms makeup the individual star produces, due to the fact that each atom’s emission spectra biunique, one can observe the spectra emitted by the star and identify the atoms that are released by the light the star produces.

The emission spectrum can tell the elements present in the source of light. Therefore, this method can be used to get information about the element present in the stars.

Electromagnetic radiations interact with atoms or molecules of matter, the electrons absorb energy and jump to a higher energy state of atoms by losing their stability.

They need to move from the higher energy state to the lower energy level to regain their stability. These atoms or molecules emit radiations in several regions of the electromagnetic spectrum. The spectrum of radiation emitted by electrons in the excited state is called the emission spectrum.

The emission spectrum of a chemical element is the spectrum of frequencies of electromagnetic radiation emitted when an atom transitions from a high-energy state to a lower-energy state. The emitted energy is unique for every element and is the characteristic of the element.

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Answer:

its c

Explanation:

Answer:

B. primary; secondary

Explanation:

Small changes in primary structure can result in large changes in protein shape and function. Secondary structure describes regions where the polypeptide is folded into localized shapes. There are two types of secondary structure (alpha helix and Beta pleated sheet).

Answer:

PbS shows a very low solubility in water, and it is insoluble in organic solvents. Any "dissolution" process in acids (hydrochloric acid, nitric acid, aqua regia) is accompanied with a chemical reaction whereby H2S is liberated and the corresponding soluble Pb2+ salts are formed. hope that helps

Answer:

A

Explanation:

Answer: The correct answer would be C.

Explanation: The order of classifications are kingdom, phylum, class, order, family, genus, and species. :)

Answer B

Explanation:Which of the following phrases helps you to correctly remember the order of classifition levels?

the answer is B

Answer:

for what school? It's different for all sadly :(

Explanation:

Answer: potassium chloride

Answer:

You can put what they are made out of so show how different they are

Answer:

802.2 K

Explanation:

To solve this problem we can use the formula:

Where Tb is the boiling point (in K).

We already know the values of both ΔHvap and ΔSvap, so we calculate Tb:

Tb = 47.45x10³J·mol⁻¹/59.15 J·mol⁻¹·K⁻¹

So the boiling point of the compound is 802.2 K (or 529 °C)

The boiling point of the compound whose ΔHvap is 47.45 KJ is 802.2 K.

The temperature at which a liquid's vapor pressure matches the pressure surrounding the liquid is known as the boiling point of that substance.

By the formula of colligative property

[tex]Tb = \dfrac{\Delta Hvap}{\Delta Svap }[/tex]

Where Tb is the boiling point (in K).

ΔHvap is 47.45 kJ·mol⁻¹

ΔSvap is  J·mol−1·K⁻¹

Putting the values

[tex]Tb = \dfrac{47.45}{59.15 } =802.2 K.[/tex]

Thus, the boiling point is 802.2 K or 529° C.

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Answer:

b ) NH₄⁺ is a stronger acid than H₂O ( l )

Explanation:

NH₄⁺ + OH⁻ = NH₃ + H₂O .

NH₄⁺ is a conjugate acid of NH₃

OH⁻ is a conjugate base of H₂O .

NH₄⁺ is capable of giving H⁺ to OH⁻ to produce H₂O so it is stronger acid than H₂O .

Had H₂O been stronger , it would have given H⁺ to NH₃ to produce NH₄⁺ but it does not happen .

So NH₄⁺ is a stronger acid than H₂O ( l )  .

Answer:

c. precipitation

Explanation:

Let's consider the following balanced net ionic equation.

Cl⁻(aq) + AgNO₃(ag) ⇒ AgCl(s) + NO₃⁻ (ag)

What kind of reaction is this?

a. acid-base. No, because the reactants are not acids and bases.

b. redox. No, because all the species have the same oxidation numbers in the reactants and the products

c. precipitation. Yes, because an insoluble compound (AgCl) is produced, which then precipitates.

Answer:

A) energy stored by atoms

Explanation:

Chemical potential energy is the energy stored by atoms. This energy form can be converted to other forms of energy.

Answer: D.

Explanation: I got it right and the dude above me is spreading fake news

Answer:

An experiment designed to synthesize dibenzlacetone would have reagents added in the following order:

Explanation:

It is worth noting that the reaction is a type of mixed aldol condensation reaction, which uses sodium hydroxide as base.

I hope this is was a clear solution to the problem.

Answer: carbon

Explanation:

Answer: hydrogen

Explanation: Hydrogen is usually considered an energy carrier, like electricity, as it must be produced from a primary energy source such as solar energy, biomass, electricity (e.g. in the form of solar PV or via wind turbines), or hydrocarbons such as natural gas or coal. On the other hand, magnesium, carbon, and iodine are not often used as conductors of electricity because they either have a covalent bond that does not generate electricity or because they contain particles or compounds that  can’t be installed inside electric installations.

Answer:

219.95 °C

Explanation:

Given data:

Volume of gas = 9.71 L

Initial pressure = 209 torr (209/760 = 0.275 atm)

Initial temperature = 10.1 °C (10.1 +273 = 283.1 K)

Final temperature = ?

Final pressure = 364 torr (364/760 =0.479 atm)

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

0.275 atm / 283.1 K = 0.479 atm/T₂

T₂ = 0.479 atm × 283.1 K/ 0.275 atm

T₂ = 135.6 atm. K /0.275 atm

T₂ = 493.1 K

Kelvin to °C:

493.1 K - 273.15 = 219.95 °C

Answer:

B. Argon has similar properties to neon.

Explanation:

hope it helps u.

The statement of element has properties similar to neon is "argon."

A substance that cannot be split into smaller components using normal chemical processes. Elements are chemical compounds that correspond to a single spot on the current periodic table. Elements are made up of only one type of atom.

Argon, like neon, is classified as a noble gas. That is, argon is a member of the noble gas family of chemicals.

Both neon and argon are positioned in the group 8, which means they have eight electrons in their outermost electron shell, making them noble and inert gases. They are very nonreactive since they already have a complete and stable octet structure and don't need to connect to other elements.

Hence the correct option is B.

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Answer The mass in grams for 25 atoms W is 763.10e-23.

The W is a symbol of tungsten. 25 atoms of tungsten gives 4596 mass in gram.

Atoms can be defined as the smallest unit into which matter can be divided  without release of electrically charged particle. It is the smallest unit that form chemical elements.

Atoms are made up of electron, protons and neutrons.

To calculate mass in gram for an atom is

Mass in gram = number of atoms x atomic mass

Atomic mass of W i.e. tungsten is 183.84 u.

So mass in gram of W = 25 atoms x 183.84 u

                                     = 4596 g

Thus, W is a symbol of tungsten. 25 atoms of tungsten gives 4596 mass in gram.

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Answer:

A SUV their more dynamic if u say so (Dads a car person)  But he could be wrong