in the process of water treatment, is the step in which water is sprayed into a fine mist allowing volatile compounds to evaporate.

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

Standard temperature and pressure (STP) conditions of 0°C and 1 atm, we can use the molar volume of a gas at STP, which is 22.4 L/mol.

1. Helium seems to have a molar mass of 4.00 g/mol.

Therefore, we can calculate the number of moles of helium as:

moles of He = mass of He divided by molar mass of He

= 2.50 g / 4.00 g/mol

= 0.625 mol

Then, we can use the molar volume of a gas at STP to calculate the volume of helium gas:

volume of He = moles of He x molar volume of gas at STP

= 0.625 mol x 22.4 L/mol

= 14.0 L

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

2. The molar mass of sodium is 22.99 g/mol. Therefore, we can calculate the number of moles of sodium as:

moles of Na = number of atoms of Na divided by Avogadro's number

= 5.0 x 10²⁵ atoms / 6.022 x 10²³ atoms/mol

= 83.0 mol

Then, we can use the molar mass of sodium to calculate the mass of sodium:

mass of Na = moles of Na x molar mass of Na

= 83.0 mol x 22.99 g/mol

= 1900 g

Therefore, 5.0 x 10²⁵ atoms of sodium have a mass of 1900 g.

3. The molar mass of Ni is 58.69 g/mol. Therefore, we can calculate the number of moles of Ni as:

moles of Ni = mass of Ni divided by molar mass of Ni

= 3.95 g / 58.69 g/mol

= 0.0673 mol

Then, we can use Avogadro's number to calculate the number of atoms of Ni:

number of atoms of Ni = moles of Ni x Avogadro's number

= 0.0673 mol x 6.022 x 10²³ atoms/mol

= 4.05 x 10²² atoms

Therefore, 3.95 g of Ni contain 4.05 x 10²² atoms.

4. The molar mass of Xe is 131.29 g/mol. Therefore, we can calculate the number of moles of Xe as:

moles of Xe = mass of Xe divided by molar mass of Xe

= 15 kg / 131.29 g/mol

= 114 mol

Then, we can use Avogadro's number to calculate the number of atoms of Xe:

number of atoms of Xe = moles of Xe x Avogadro's number

= 114 mol x 6.022 x 10^23 atoms/mol

= 6.87 x10²⁵ atoms

Therefore, a 15 kg sample of Xe gas contains 6.87 x 10²⁵ atoms.

5. A gas's molar volume at STP is 22.4 L/mol. Therefore, we can calculate the number of moles of Ar as:

moles of Ar = number of atoms of Ar divided by Avogadro's number

= 45,000,000 atoms / 6.022 x 10²³ atoms/mol

= 7.47 x 10⁻¹⁷ mol

Then, we can use the molar volume of a gas at STP to calculate the volume of Ar gas:

volume of Ar = moles of Ar x molar volume of gas at STP

= 7.47 x 10⁻¹⁷ mol x 22.4 L/mol

= 1.67 x  10⁻¹⁵ L

Therefore, 45,000,000 atoms of Ar would occupy a volume of 1.67 x 10⁻¹⁵ liters at STP.

6. The molar mass of CO₂ is 44.01 g/mol. Therefore, we can calculate the number of moles of CO₂ as:

moles of CO₂ = mass of CO₂ divided by molar mass of CO₂

= 75 g / 44.01 g/mol

= 1.70 mol

Then, we can use Avogadro's number to calculate the number of atoms of CO₂:

number of atoms of CO₂ = moles of CO₂ x Avogadro's number

= 1.70 mol x 6.022 x 10²³ atoms/mol

= 1.02 x 10²⁴ atoms

Therefore, a 75 g sample of CO₂ contains 1.02 x 10²⁴ atoms.

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Answer:

D.

Explanation:

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Answer: D Geothermal

Explanation:

collisions between the gas particles and the walls of the container.

What is kinetic molecular theory?

The assumption that matter is made up of microscopic particles that are always in motion forms the foundation of the kinetic-molecular theory, which explains the states of matter. The observable characteristics and behaviours of solids, liquids, and gases are explained by this theory. We can better comprehend why matter exists in different stages (such as solid, liquid, and gas) and how it can transition from one stage to another thanks to the kinetic theory of matter. One may also think about various properties of matter using the kinetic theory of matter.

Therefore,

According to the kinetic molecular theory, where does the pressure exerted by a gas in a container come from collisions between the gas particles and the walls of the container.

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Answer:

Group: 16 Period: 2

Explanation:

There are 8 protons, which determine that the element is Oxygen. Oxygen is in group 16 and Period 2.

Answer:

A reaction in which two or more reactants combine to form only one product is called a synthesis reaction.

Explanation:

Answer:

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Explanation:

Neo mixes 600ml of black paint with white paint in order to get a gray paint. he think the colour came out too dark ,so that decreases the amount of black paint in the ratio 7:12. Calculate how much black paint it would be

Answer:true

Explanation:

because  its just true

Answer:

Explanation:

En este caso para formular los compuestos, debes identificar el grupo funcional principal de la molecula. Una vez que eso está hecho, puedes intentar formularlo.

Empezaremos primero identificando el grupo funcional principal de la molécula, para luego formularlo correctamente.

Dietil eter: la terminación eter al final significa que pertenece al grupo de los éteres, el cual tiene como formula general R - O - R.

Etanol: debido a que termina en ol, este grupo pertenece a los alcoholes. Para formularlo solo se dibuja la molecula del etano, junto a un enlace con el grupo OH, como su formula general R - OH.

Propanotriol: igualmente termina en ol, por lo tanto es un alcohol, sin embargo, en este caso, tambien tiene la terminación prefija tri, asi que significa que hay 3 grupos OH en la molecula.

Acido propanodioico: esta es sencilla, porque empieza como acido, y solo hay un grupo funcional que empieza así y son los acidos carboxilicos, es decir, el grupo COOH (R - COOH) que es el carboxilo. Tiene el prefijo di, antes del oico, por lo que son dos carboxilos presentes en la molecula.

Pentanal: el sufijo al, significa que pertenece al grupo de los aldehidos, en este caso, posee el grupo carbonilo H - C = O.

Pentano - 2,4 - diona: la terminación ona significa que pertenece al grupo de las cetonas, (R - CO - R), parecido a los aldehidos, con la diferencia de que tiene grupos alquilos en lugar de un hidrogeno.

Metanoato de metilo: la terminación ato de ilo, pertenece a los esteres, (R - COOR) derivado de los acidos carboxilicos.

De aqui en adelante solo mencionaré los grupos funcionales pues ya se explicó el por que, por sus terminaciones:

Ciclohexano - 1.3 - diol: este pertenece a los alcoholes.

Acido heptanoico: acido carboxilico

Ciclobutil metil eter: eteres

Acetato de etilo: ester

2-metilbenzaldehído: aldehído unido a un grupo aromatico como el benceno.

Ciclohexanona: un ciclo (cadena cerrada) unido a un grupo carbonilo.

Butanona: cetona.

Observa la foto adjunta para que veas la formulación de cada una:

Answer:

Transition Metal

Explanation:

Hey there is a really easy tool called PTable that is an interactive periodic table that does all kind of things. needed in Chem

Answer:

A photon is emitted when an atom moves from an excited state to its ground state or to a lower-energy excited state.

Explanation:

I honestly know the answer just can't explain it. but here. hope this helps.

The 25 mL is the calibration of this Erlenmeyer flask. so, option (b) is correct.

What is calibration ?

The process of calibrating a measurement instrument involves comparing it to a traceable reference device and documenting the comparison. A "calibrator" is another name for the reference standard. It stands to reason that the reference is more accurate than the calibration instrument.

What is  Erlenmeyer flask?

Erlenmeyer flasks are used to mix, heat, cool, incubate, filter, store, and perform various liquid-handling operations on liquids. For titrations and boiling liquids, their sloping sides and narrow necks enable the contents to be blended by swirling without the risk of spillage.

Therefore, 25 mL is the calibration of this Erlenmeyer flask.

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After 72 days, a 1050 mg sample of Iodine-131 would have decayed to approximately 46.87 mg.

A half-life is the time it takes for half of a sample of a radioactive isotope to decay. It is a characteristic property of each isotope and can be used to predict how long it will take for a given sample to decay to a certain amount. The amount of an isotope remaining after a certain amount of time can be calculated using the half-life and the formula N = N0 * (1/2)^(t/T).

Iodine-131 is used in medical treatments because it emits beta particles that can destroy cancerous cells. Its short half-life is an advantage because it allows for a higher dose of radiation to be delivered to the tumor while minimizing the amount of radiation exposure to healthy tissues. After a few weeks, the Iodine-131 decays to a negligible amount and the patient is no longer radioactive.

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The enthalpy changes, ΔH for the given three reactions using the Hess's Law is ΔH= -637 kJ/Mol .

Third reaction is reversed including sign of the ΔH :

H₂(g)+1/2O₂(g) ⟶   H₂O(l)    ΔH=−286 kJ/mol

Ca(s)+2H+(aq)    ⟶  Ca₂+(aq)+H₂(g)   ΔH=−544 kJ/mol

Ca₂+(aq)+H₂O(l)    ⟶ CaO(s)+2H+(aq) ΔH=+193 kJ/mol

          Ca(s)+1/2O₂(g)⟶CaO(s)    ΔH= -637 kJ/Mol

The enthalpy shift can be estimated for a reaction thanks to Hess's law, even if it cannot be determined directly. This is accomplished via doing straightforward logarithmic activities in light of the compound condition of responses utilizing values recently characterized for the arrangement of enthalpies.

Hess' regulation can be utilized to decide the general energy expected for a substance response that can be separated into engineered advances that are exclusively more straightforward to describe. As a result, standard enthalpies of formation can be compiled, which can be utilized to anticipate the enthalpy shift in complex syntheses.

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5) B

6) C

7) B newland, law of octaves

8) A)

Answer:2.26

Explanation:

Answer:

When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. Solid water, or ice, is less dense than liquid water. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.

Answer:

number of outer shell electrons

Answer:

Molecular Mass

Explanation:

It's asking for the numerical quantity. That quantity would be the Molecular Mass. Take the sample mass and divide it by the molecular mass to get the number of moles.

(14g N * 2) + (1g H *4) = 32g / mol of N2H4

To get # of moles, divide the sample mass by the molecular mass

25g / 32g = 0.78125 moles

The electron configuration of a potassium atom at ground state is 1s²2s²2p⁶3s²3p⁶4s¹. Therefore, option D is correct.

The electron configuration of an element can be explained as electrons being occupied in different energy levels of an atom of a specific element. In the electron configuration, the electrons are usually written as a superscript of atomic subshells. For example, the electron configuration of Helium can be represented as 1s²2s².

The sequence of completely filled subshells similar to neighboring the electronic configuration of a noble gas is represented by square brackets. The principal quantum number (n) will be used to denote the maximum number of electrons in an electron shell.

The total number of electrons occupied in the given electronic configuration  1s²2s²2p⁶3s²3p⁶4s¹  is 19. The atomic number of potassium is 19 therefore it is the configuration of potassium.

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Answer:

The law of definite proportions states that all pure samples of a particular chemical compound contain similar elements combined in the same proportion by mass.

The second law of chemical combination which is supported by the Atomic theory was proposed by Proust (1755-1826). Known as the Law of Definite Proportions or Constant Composition ,it is based on the fact that when elements combine to form a given compound , they do so in fixed proportions by mass so that all pure samples of that compound are identical in composition by mass.

Consider water for example . Chemical analyses showed that as long as it is pure, its composition is always in the ratio of one mole of oxygen molecules (i.e 32 g) to two moles of hydrogen molecules (i.e 4g) , irrespective of whether the water comes from the river , sea, rain ,wine ,saliva  or any other source .

Explanation:

Answer:

D. decomposing

General Formulas and Concepts:

Chemistry

Explanation:

A would be incorrect because mixing 2 things together doesn't necessarily create a chemical change. Take oil and water for example. You can mix the 2 and it would not have a chemical change.

B would be incorrect because you are simplify changing the state of matter of the object. Iron in solid form is still iron in liquid form; there is no chemical change.

C would be incorrect for similar reasons as B. You are simply changing the state of matter.

D would be the remaining and correct answer. Decomposing changes one object into a different one by chemically changing.

Ionic compounds are those that are created when an electron is transferred from one atom to another. A metal and a non-metal will always form an ionic bond.

For instance, potassium forms a potassium iodide complex when it transfers its one valence electron to iodine.

Additionally, a covalent compound is one that is created when joining atoms share electrons.

For instance, fullerenes are an allotrope of carbon in which the carbon atoms share electrons.

Fullerenes are covalent compounds as a result.

Metal atoms of one or more elements are said to be chemically linked to one another to form metallic compounds

For instance, pure potassium will solely contain potassium atoms.

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Answer with Explanation:

A "chemical change" occurs when the structure of the molecules change. If there's no change in structure, it is called a "physical change." This also means that a chemical reaction has to occur for something to be considered a chemical change.

Gasoline when used as a fuel is being transformed into other forms of energy. It undergoes a process called "combustion."

When used as a fuel for cars, the gasoline is being burned to produce heat energy. This energy is then converted into mechanical energy that allows the car to move. Clearly, the gasoline has undergone a chemical change.

Answer:

Explanation:

Here, we want to know what happens to a solution that becomes more acidic

A lesser ph (1-7) indicates acidity with the acidity being higher as the number becomes smaller

What this means is that a solution with a pH of 3 is more acidic than a solution with a pH of 5

Thus, when the acidity increases, it is expected that the pH of the solution decreases (it becomes smaller in number)

Answer:

its c ma man .

This is the other ray that will make up the angle ∠AYZ and will complete the constructioExplanation:

if your taking the quick check these were my awnsers

1.c

2.b

3.d

4.c

5 .A

for the copying an angle quick check only

Answer:

Explanation:

The objects velocity will decrease because the force is opposing its motion

From the question, we would have the balanced ionic equation as; 2Ag^+(aq) + (ClO₄)₂^-(aq)  -------> 2Ag(ClO₄)₂ (s)

We know that a reaction equation is said to be balanced when the number of atoms of the elements on the reactants side is equal to the number of atoms of the same element on the products side. This is achieved by the process that we call an atom count. After we add the necessary stoichiometric coefficients that we think would help us to be able to obtain the  number of atoms that could be used to balance the equation as shown.

In this case, we are required to write the balanced reaction  equation for the reaction when AgC₂H₃o₂ and Ni(ClO₄)₂ are mixed in aqueous solution.

We would then have in this case;

2AgC₂H₃o₂ (aq) + Ni(ClO₄)₂ (aq) -------> 2Ag(ClO₄)₂ (s)+ Ni(C₂H₃o₂)2 (aq)

Net ionic equation is;

2Ag^+(aq) + (ClO₄)₂^-(aq)  -------> 2Ag(ClO₄)₂ (s)

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Answer:

Physical dependence is characterized by tolerance and withdrawal. Drug or substance dependency is psychological.

The reason why [H, 0] is not included in the calculation of the K of borax is that it is not a significant contributor to the overall equilibrium of the system.

Borax, or sodium borate, reacts with HCl to form a complex ion, so the equilibrium equation only involves the concentrations of borax and the complex ion.

To calculate the K of the borax, we can use the equation;

K = [complex ion]/[borax]

Here, first, the determination of the concentration of the complex ion is required which is done by using the volume and concentration of the HCl solution that reacts with the borax-borate equilibrium solution.

Later, the equation n = C x V is used to determine the amount of HCl that reacts, then use stoichiometry to determine the amount of complex ion that is formed.

The moles of HCl reacted: (29.10 mL)(0.100 M) = 2.910 mmol.

Since there's a 1:1 ratio between HCl and borate, 2.910 mmol of borate reacted.

Thus, the initial concentration of borate is (2.910 mmol)/(9.00 mL) = 0.323 M.

To determine ΔH and ΔS, plot the graph of ln(K) vs 1/T and find the slope and y-intercept of the line of best fit.

Here, the slope is equal to -ΔH/R and the y-intercept is equal to ΔS/R, where R is the gas constant.

The units for ΔH are J/mol and the units for ΔS are J/(mol*K).

The value of R² tells us how well the data points fit the line of best fit.

A value of 1 means that all data points lie on the line, while a value of 0 means that none fit the line.

The closer R² is to 1, the more confident one can be in the values of ΔH and ΔS that are determined.

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