A photon has a frequency of 2.9 × 10-16 Hz. Planck's constant is 6.63 x 10-34 J.s.
The energy of the photon, to the nearest tenths place, is
× 10-49 J.

The concentration of the diluted HCl solution is 0.363 M, rounded to 3 decimal places.

When a stock solution is diluted, the number of moles of the solute (in this case, HCl) remains constant. We can use the following equation to find the concentration of the diluted solution:

M1V1 = M2V2

where M1 is the initial concentration of the stock solution, V1 is the volume of the stock solution used, M2 is the final concentration of the diluted solution, and V2 is the final volume of the diluted solution.Substituting the given values, we get:

(3.31 M) × (17.5 mL) = M2 × (159 mL)

Solving for M2, we get:

M2 = (3.31 M × 17.5 mL) / 159 mL = 0.363 M.

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Bohr's model lacked orbitals again for electrons or the electron cloud, contrary to Dalton's theory, which was founded on the idea that every element is made up of its own distinct variety of an indivisible atom.

According to the theory, an atom contains a small, dense, positive charge centre known as the nucleus, where practically every bit of mass was concentrated. Light, particles with negative charges called electrons then orbit far from the nucleus in a manner similar to how planets circle the Sun.

Dalton proposed his atomic hypothesis based on all of his observations. It's frequently called the billiards ball model. Due to the lack of understanding of the atomic electrons and the nucleus at the time, he described an atom as a ball-like structure.

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Answer:

B.)Schrodinger's model

Explanation:

Answer:

all of them

Explanation:

In semiconductors, the band gap is small, allowing some electrons to be promoted at ordinary temperatures, resulting in conductivity of those materials.

In certain materials, such as semiconductors, the band gap is small, enabling some electrons to be promoted from the valence band to the conduction band even at ordinary temperatures. This phenomenon leads to conductivity and various electrical properties of the material.

The band gap refers to the energy difference between the valence band (the highest energy level occupied by electrons in the material's ground state) and the conduction band (the energy level above the valence band where electrons can freely move and conduct electricity). In materials with a small band gap, the energy required to excite electrons from the valence band to the conduction band is relatively low.

At ordinary temperatures, thermal energy is present in the form of heat, causing atoms and electrons to vibrate and gain energy. In materials with a small band gap, this thermal energy can be sufficient to promote some electrons across the band gap and into the conduction band. These promoted electrons become mobile, contributing to the material's conductivity.

This behavior is significant in semiconductor devices, where the ability to control the flow of electrons is essential. By carefully selecting materials with small band gaps, semiconductor devices can exhibit desired electrical characteristics, such as enhanced conductivity, the ability to amplify signals, and the generation of light in light-emitting diodes (LEDs).

In summary, materials with small band gaps allow electrons to be easily promoted to the conduction band at ordinary temperatures, leading to their electrical conductivity and enabling various applications in semiconductor technology.

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Answer:

what's different about the particles in her hand are that for one are a solid in contrast to the ice cream which is partially liquid.

Influenza viruses spread mainly through droplets of respiratory secretions in the air, typically generated by coughing and sneezing.

A contagious illness brought on by influenza viruses, influenza is also referred to as "the flu." Flu-like symptoms, which can range in severity from moderate to severe, frequently include fever, runny nose, sore throat, muscle discomfort, headache, coughing, and exhaustion. After being exposed to the virus, these symptoms usually appear one to four days later and remain for two to eight days.

Especially with children, diarrhea and vomiting can happen. Pneumonia, which can be brought on by the influenza virus or a subsequent bacterial infection, may develop from the viral-related illness. Other side effects of infection include meningitis, encephalitis, acute respiratory distress syndrome, and deterioration of pre-existing conditions like asthma and cardiovascular disease.

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Answer:

Explanation:

a substance's enthalpy of fusion tells you how much heat is needed in order to convert

1 g

of said substance from solid at its melting point to liquid at its melting point.

In water's case, an enthalpy of fusion equal to

333.55 J g

−

1

tells you that

1 g

of ice at

0

∘

C

can be converted to

1 g

of liquid water at

0

∘

C

by supplying

333.55 J

of heat.

Your ice cube has a mass of

55.0 g

, which means that it will require

55.0

g

⋅

=

Δ

H

fus



333.55 J

1

g

=

18,345.25 J

Rounded to three sig figs, the number of sig figs you have for the mass of the ice cube, the answer will be

heat needed

=

∣

∣

∣

∣

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

a

a

18,300 J

a

a

∣

∣

−−−−−−−−−−

the basic unit of structure and function in all living things.

Answer:

all living things.

Explanation:

PVC (Polyvinyl Chloride) polymers are used to produce soft and flexible materials such as vinyl flooring, shower curtains, and some water bottles.

PVC, or Polyvinyl Chloride, polymers are the main component used in the production of soft and flexible materials like vinyl flooring, shower curtains, and certain types of water bottles. PVC is a synthetic plastic polymer that is created through the polymerization of vinyl chloride monomers. This process forms long chains of repeating vinyl chloride units, resulting in a versatile and durable material.

One of the key characteristics of PVC is its flexibility. By adjusting the polymerization process and adding plasticizers, PVC can be made soft and pliable, allowing it to be molded into various shapes and forms. Plasticizers are additives that increase the flexibility and workability of PVC by reducing the intermolecular forces between polymer chains. This enables PVC to be used in applications that require flexibility and elasticity, such as vinyl flooring, shower curtains, and certain water bottles.

Vinyl flooring, for example, is a popular choice for both residential and commercial spaces due to its softness and ability to withstand high traffic. The pliability of PVC allows the flooring material to be easily installed, bent, and shaped to fit different room dimensions. Additionally, the flexibility of PVC enables the material to absorb shocks and reduce noise, providing a comfortable and quiet flooring option.

Shower curtains are another common application of PVC. The flexibility of PVC allows the curtain to be easily opened and closed while providing a waterproof barrier. PVC shower curtains are also resistant to mold and mildew, making them a practical choice for moist environments like bathrooms.

Certain types of water bottles are also made from PVC. These bottles are typically soft and collapsible, making them convenient for carrying and storing liquids. The flexibility of PVC allows the bottle to be easily squeezed, providing a practical solution for on-the-go hydration.

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Answer:

it's a chemical Element

Explanation:

symbol He

atomic number 2.

Answer:

A - VSEPR

Explanation:

The concept being explained here is VSEPR theory, which helps explain molecular geometry. In this theory, electron domains (electron pairs and bonds) repel, so the electron domains are arranged where they are far away from each other. Electron pairs are more repulsive than bonds, and thus will orient themselves such that they are not close to one another.

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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The increasing order of ions are Sr²⁺ <  Br < Se²⁻ ,  the one with the biggest negative charge will have the most elevated nuclear sweep .

Among the isoelectronic particles, the one with the biggest negative charge will have the most elevated nuclear sweep and the one with the biggest positive charge will have the littlest nuclear span. This indicates that Sr²⁺ will be the smallest ion among Sr²⁺, Rb⁺, Br, and Se²⁻ .

Anions are ions with a negative charge, while cations are ions with a positive charge. The amount of electrostatic attraction between the nucleus' protons and electrons can alter the size of an atomic radii. Ions that lose electrons typically squeeze the last few electrons closer together, shrinking them. Particles that gain electrons by and large don't have adequate positive charge from the core to attract them, and in this way, the sweep gets bigger.

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Here are the mineral formulas and the valence states of the cations and anions for the minerals you listed:

Barite:

Mineral formula:\(BaSO_4\)

Valence states:

\(Ba_2\)+ (Barium cation) with a valence of +2

\(SO_4 2\)- (Sulfate anion) with a valence of -2

Almandine (garnet):

Mineral formula: \(Fe_3Al_2Si_3O_{12\)

Valence states:

Fe₃+ (Iron cation) with a valence of +3

Al₃+ (Aluminum cation) with a valence of +3

Si₄+ (Silicon cation) with a valence of +4

O₂- (Oxygen anion) with a valence of -2

Azurite:

Mineral formula: Cu₃(CO₃)₂(OH)₂

Valence states:

Cu₂+ (Copper cation) with a valence of +2

CO₃2- (Carbonate anion) with a valence of -2

OH- (Hydroxide anion) with a valence of -1

The structural formula of a mineral has to be electrically neutral (i.e., it must have a net charge of 0). The following are the mineral formulas and valence states of anions and cations for each of the minerals listed below:

1. Barite: BaSO₄Barite is a mineral that contains the following:Barium (Ba)Cations have a valence state of 2Sulfate (SO₄)Anions have a valence state of 2The formula for barite is BaSO₄.

2. Almandine (garnet): Fe₃Al₂Si₃O₁₂ Almandine is a mineral that contains the following:Iron (Fe)Cations have a valence state of 2+Aluminum (Al)Cations have a valence state of 3+Silicon (Si)Cations have a valence state of 4+Oxygen (O)Anions have a valence state of 2-The formula for almandine (garnet) is Fe₃Al₂Si₃O₁₂.

3. Azurite: Cu₃(CO₃)₂(OH)₂Azurite is a mineral that contains the following:Copper (Cu)Cations have a valence state of 2+Carbonate (CO₃)Anions have a valence state of 2-Hydroxide (OH)Anions have a valence state of 1-The formula for azurite is Cu₃(CO₃)₂(OH)₂

These mineral formulas and valence states represent the overall electrical neutrality of the minerals. The valence states indicate the charge of each ion, whether it is a cation (positively charged ion) or an anion (negatively charged ion), in order to balance the overall charge of the mineral formula to zero.

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Answer:

The answer is 2

Explanation:

when viewed from earth number 2 would be a waning gibbous

Alkanes are the simplest family of hydrocarbons, compounds containing only carbon and hydrogen, and only carbon-hydrogen bonds and carbon-carbon single bonds. Alkanes are less reactive and have little biological activity. All alkanes are colorless and odorless.

What are the applications of 3-hexanol?

n-Hexanol is a colorless liquid with a fruity smell. It is used in the production of flavoring additives, pesticides, leather processing, preservatives, perfumes, plasticizers and other chemicals. n-Hexanol is included on the Hazardous Materials List as cited by the DOT and NFPA.

What are alkanes?

In organic chemistry, alkanes or paraffins are saturated acyclic hydrocarbons. In other words, alkanes are composed of hydrogen and carbon atoms arranged in a tree structure in which all carbon-carbon bonds are single. Alkane has the general chemical formula CₙH₂ₙ₊₂

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The moles would be 12 moles, 4 moles and 11.34 moles

When hydrogen gas (H2) reacts with oxygen gas (O2) to produce water (H2O), the balanced chemical equation is:

2H2 + O2 -> 2H2O

So,

For every 6 moles of H2, 12 moles of H2O will be produced

For every 2 moles of H2, 4 moles of H2O will be produced

For every 5.67 moles of H2, 11.34 moles of H2O will be produced.

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Yes the increase in temperature of sodium chloride will cause a decrease in it solubility.

Answer is True

Sodium chloride is a type of salt whose solubility decreased with increased temperature, this is quite unusual to other solute.

With the case of Sodium Chloride, this principle is applied in purifications like re-crystallization which is used to recover solute in solvents

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To find the molarity of the solution, we first need to calculate the number of moles of LiNO3 present in the solution, using its given mass and molar mass.

The molar mass of LiNO3 can be calculated by adding the atomic masses of lithium (Li), nitrogen (N), and three oxygen (O) atoms:

Molar mass of LiNO3 = 6.94 g/mol (Li) + 14.01 g/mol (N) + 3 x 16.00 g/mol (O) = 68.94 g/mol

Next, we can calculate the number of moles of LiNO3 by dividing its mass by its molar mass:

Number of moles of LiNO3 = 1.66 g / 68.94 g/mol = 0.0241 mol

Finally, we can calculate the molarity of the solution by dividing the number of moles of solute by the volume of the solution in liters:

Molarity = Number of moles / Volume of solution in liters

The volume of the solution is given as 455 mL, which is equivalent to 0.455 L. Therefore, we can calculate the molarity as:

Molarity = 0.0241 mol / 0.455 L = 0.053 mol/L

Therefore, the molarity of the solution is 0.053 mol/L or 0.053 M (molar).

After equilibrium is established, then type of ion in solution in largest concentration, other than the k ion, is : (b) HPO₄²⁻.

In chemistry, equilibrium is a state of balance or stability achieved in chemical reaction when the rates of forward reaction and reverse reaction are equal.

The balanced chemical equation for the reaction between H₃PO₄ and KOH is:

H₃PO₄ + 3KOH → K₃PO₄ + 3H₂O

In this reaction, one mole of H₃PO₄ reacts with three moles of KOH to produce one mole of K₃PO₄ and three moles of water.

When equal volumes of 0.10 M H₃PO₄ and 0.20 M KOH are mixed, the concentration of OH⁻ ions will be in excess because KOH is strong base and H₃PO₄ is a weak acid. The OH⁻ ions will react with H⁺ ions of H₃PO₄ to form water, according to following reactions:

H₃PO₄ + OH⁻ → H₂PO₄⁻ + H₂O

H₂PO₄⁻ + OH⁻ →  HPO₄²⁻ +H₂O

The net effect of these reactions is that H₃PO₄ reacts with OH⁻ to produce HPO₄²⁻. Therefore, the type of ion in solution in largest concentration, other than the K+ ion, is  HPO₄²⁻.

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Answer:

2400000000

Explanation:

i believe that this should be the correct answer i punched in the numbers of conversion based off of what you put in your question.

Answer:

35.453 atomic mass units

You can use Phet (Atomic masses, Elements and more)  for Chemistry

When reading the label on a reagent container, the three most important pieces of information include:

This is referred to a chemical which is added to a mixture thereby resulting in a chemical reaction occurring and have different properties which is why the label has to contain their features.

It is therefore best to check the label for properties such as name and concentration so as to enable individuals use it for the right type of reactions and is also important in prevention of the risk of accident by individuals.

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Answer:

Explanation:

Here, we want to select the most important information piece to determine saturation

The best way to check for this is to check the kind of bonds between the carbon atoms in the molecule

When there are double or triple covalent bonds between the carbon atoms, then, we can be sure that there is a degree of unsaturation (alkenes, alkynes)

If we have single bonds only, then the molecule is saturated

Genetic disorders that are extremally dehabilitating

Answer:

The second student is right.

Explanation:

The coyote feed on not only phalaropes but many other organisms present in the environment for its survival. There are many other organisms present in the ecosystem such as mice, squirrel, cactus fruit etc. The coyote feeds on phalaropes, the phalaropes feeds on brine shrimp and the brine shrimp feeds on algae for its survival so in this way the ecosystem moves in the forward direction. The coyote feeds on phalaropes so the energy that is present in phalaropes transferred into coyote which only 10 % while the remaining is released in the atmosphere in the form of heat energy.

Answer:

Sodium reacts with the oxygen in air. It reacts vigorously with oxygen and the moisture that is already present in the air and thus catches fire.

It would be a bad idea to make coins made of sodium metal, beacause of their reactive nature.

Those species which are not stable in nature and always ready to show reaction with another species, is known as reactive species.

Sodium metal is highly reactive in nature, means it easly reacts with the atmospheric oxygen and shows oxidation or with the moisture content of atmosphere as a result of which vigorously catches fire. That's why we don't use sodium to make coin.

Hence, beacause of reactive nature sodium is not used.

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133.0 grams and 72.0 grams of Li2CO3 and Ca would be formed respectively.

From the equation of the reaction:

\(2 Li + CaCO_3 ---> Li_2CO_3 + Ca\)

The mole ratio of Li to Li2CO3 is 2:1 while that of Li to Ca is also 2:1.

Mole of 25.0 grams of Li = mass/molar mass

                                        = 25/6.94

                                           = 3.6 moles

Equivalent of mole of Li2CO3 = 3.6/2

                                                  = 1.8 moles

                                              = 1.8 x 73.89

                                              = 133 grams

Equivalent mole of Ca = 3.6/2

                                   = 1.8 moles

                                    = 72 grams

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If 25.0 grams of barium nitrate are placed in 100.0 ml of 2.00 M sodium sulfate,  The  grams of precipitate will theoretically form is 20.97 g.

The reaction is given as :

Ba(NO₃)₂   +   Na₂SO₄  ----->   BaSO₄

given that :

mass of Ba(NO₃)₂ = 25 g

molarity of   Na₂SO₄ = 2 M

volume = 100 mL = 0.1 L

moles of Na₂SO₄  = molarity × volume

                              = 2 × 0.1

                              = 0.2 mol

moles of Ba(NO₃)₂ = mass / molar mass

                               = 25 / 261.33

                               = 0.09 mol

Ba(NO₃)₂ is limiting reagent. therefore , the 1 mole of Ba(NO₃)₂ produce 1 mole of BaSO₄.

moles of BaSO₄ = 0.09 mol

mass of BaSO₄ = moles × molar mass

                         = 0.09 × 233

                         = 20.97 g

The  theoretically yield = 20.97 g

Thus, If 25.0 grams of barium nitrate are placed in 100.0 ml of 2.00 M sodium sulfate,  The  grams of precipitate will theoretically form is 20.97 g.

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