what is the frequency of a wave carrying 8.35 x 10^-18 J of energy?

The change in the internal energy of the gas is 1.5×10∧3 J.

The internal energy of an ideal gas is directly proportional to the temperature of the gas:

ΔE = 3/2 × n × R × ΔT

ΔT = 320 K - 260 K

ΔT = 60 K; change of the temperature

n = 2.0 mol: amount of a monatomic ideal gas

R = 8.1 J/mol×K;the ideal gas constant

ΔE = 3/2 × 2 mol × 8.1 J/mol×K × 60 K

ΔE = 1500 J

ΔE = 1.5×10∧3 J;  the internal energy of the gas

Isobaric process is a type of process in which the pressure of the system stays constant.

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Answer:

34.4

Explanation:

You would divide the mg by 1000 to get the number of grams.

The can be said about the mass of the 1M HCl and 1 M NaOH after they were combined

The combined mass of the 1 M HCl and 1 M NaOH was the sum of their respective masses.

So, hydrochloric acid reacts with sodium hydroxide approach to form sodium chloride and water. This response can be represented as: Hydrochloric acid + Sodium hydroxide → Sodium chloride + Water.

The mass of the 1.0 M HCl and 1.0 M NaOH solutions after they were combined is 76.5g.

HCl  +  NaOH ⇄ NaCl + H₂O

1 mole of HCl produces 1 mole of NaCl

36.5g of HCl produces= 58.5g of NaCl

36.5g of HCl produces= 18g of H₂O

Total mass after combining = 58.5g + 18g = 76.5g

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The pH of the solution after dilution is 1.125.

HCl is hydrochloric acid. It is known by the name muriatic acid. It is among the strong acids. It has a pungent smell and is colorless. It has a molar mass of 36.4 g/mol. It's a common reagent used in pharmaceutical industries. It is also used in other industries such as textile, rubber, and metal.

The volume of HCl added to the solution = 3.0 ml

The molar concentration of HCl = 2.5 M

Let the molar concentration of the solution after dilution is x.

The volume of the diluted solution = 100 ml.

The molar concentration of the solution after dilution is,

[tex]M _{1} V _{2} = M_{2} V _{2} [/tex]

[tex]M_{2} = \frac{ M _{1} V _{2}}{V _{2} }[/tex]

[tex]M_{2} = \frac{2.5 \times 3}{100} [/tex]

[tex] = 0.075 \: M[/tex]

Thus, the molar concentration of the solution after dilution is 0.075 M.

The pH of the solution after the dilution is,

[tex][HCl] = [H ^{ + } ] = 0.075 \: M[/tex]

[tex]pH = - log [H ^{ + } ] [/tex]

[tex]pH = - log(0.075)[/tex]

[tex]pH = 1.125[/tex]

Therefore, the pH of the solution after dilution is 1.125.

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The reaction of benzaldehyde with acetone and sodium hydroxide produces DibenzalacetoneThis is an example of an aldol condensation reaction.

A physical reaction is a reaction in which a change in the physical properties of matter or substances occurs. Physical properties include density, mass, and volume. The definition of a physical reaction is a reaction in which molecules undergo molecular rearrangements but do not change chemically.

A response, although technically a reaction, takes into account the desired outcome of the interaction. Reactions can produce positive or negative results, but reactions are designed to produce positive or negative results. To react is emotional, to react is emotional intelligence.

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If the energy of the photon of light emitted from a hydrogen atom has a magnitude of 4.084 x 10-19 j, and the electron starts at level n = 4 then  final state of the electron is n=2

Here given data is energy of the photon of light emitted from a hydrogen atom has a magnitude of 4.084 x 10-19 j and electron starts at level n = 4 then from ground state to excited state n=2 final state are seen from given data  energy of the photon = E= -2.18×10⁻¹⁸J (1/nf²-1/ni²) using this formula ans is to be 0.235 and this energy is n=2 are seen thats why final state of electron are seen in n=2

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Answer: 17.5 cm

Explanation:

10 mm=1 cm

175mm * 1 cm/10 mm=

175/10 cm=17.5 cm

You are given the sodium acetate, hcl (1 m), nahco3, and nahco3 we need na2co3

Here pKa Co=310.3⁴  buffer of pH =9.9

Use nahco3, and na2co3 to prepare 100mL of buffer with 0.1M of concentration here we calculate the given salt,

pH=pKa+log[salt]/[acid]  9.9=10.1+log[na2co3]/[nahco3][na2co3]/[nahco3] = 0.63

[na2co3]+[nahco3]=0.1M

0,63[nahco3]+[nahco3]=0.1 [nahco3]=0.0613M

Moles=molarity×volume=0,0613×100/1000=0.0613moles

[na2co3]=0.1-0.0613=0.938M

Moles=0.938M

Calculated moles will be prepared in buffer in 100 ml solution

Moles=mass/molecular weight

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The mass of NaCl produced is 0.117 g.

The pH of a solution is what tells us if the solution is acidic or basic. The solution is acidic if the pH of the solution is less than 7.

1) pH = - log(3.5 x 10^-5 M)

= 4.45

Thus the solution is acidic.

2) We can see that the concentration as given is the concentration of OH^-

[OH ] = 4.0 x 10^-3 M

pOH = -log (4.0 x 10^-3 M)

pOH = 2.39

pH = 14 -  2.39

pH = 11.61

The equation of the reaction is; [tex]NaOH + HCl ----- > NaCl + H2O[/tex]

Number of moles of NaOH =  0.40 M * 10/1000 = 0.004 moles

Number of moles of HCl = 0.20 M  * 10/1000 = 0.002 moles

We can see that HCl is the limiting reactant

Mass of NaCl produced ;

0.002 moles * 58.5 g/mol = 0.117 g

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A  Slump is a type of mass movement where the material stays fairly coherent and moves over a well-defined surface.

What is a slump?

A slump is a colloquial expression denoting a precipitous drop in commercial activity, trade, or market values. The term "slump" is particularly adaptable since it may be used to refer to both a brief, abrupt collapse and a longer-lasting, more steady period of low activity or value. There are downturns in the markets, the economy, industries, and incomes, among other things.

A slump typically refers to the start of a recession in economic terms. The months prior to the official announcement of a recession are simply referred to as a protracted economic slump because a recession is not officially announced until several months of decreased activity have passed.

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The density of the iron, given the data from the question is 7.85 g/mL

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

The following data were obtained from the question:

The density of the iron can be obtained as follow:

Density = mass / volume

Density of iron = 15 / 1.91

Density of iron = 7.85 g/mL

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Answer:

average speed = 32

Explanation:

the formula is speed = distance / time

so s = d / t

s = 16 m / 0.5 s

s = 32 meter per second

If you have 9 moles of CaCl₂ and all the  Na₃PO₄i needed 18 moles of NaCl

In the chemical reaction here

CaCl₂ +  Na₃PO₄ → Ca₃(PO₄)₂ + NaCl if we balance this chemical reaction then

3CaCl₂ +  2Na₃PO₄ → Ca₃(PO₄)₂ + 6NaCl then Ca=1×3=3

,Cl=2×3=6,

Na=3,PO₄=1,

all this are in reactant Ca=3, Cl=1, Na=1, PO₄=2 all this are in product so NaCl produce 18 moles.

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When we double the quantities of reactants and products in a reaction,  the value of the equilibrium constant remains the same.

K = [P]/[R]

where,

[P]  is the concentration of the product.

[R] is the concentration of reactant.

If we double the quantities of reactants and products in the final concentration it'll become

[R]2=2×[R]1 and [P]2=2×[P]1

Now at initial stage

K1 =  [P1]/[R1]

at final stage after doubling the products

K2=[P2]/[R2]

Putting the given values

K2/K1 = 2×[P1]×[R1]/2×[R1]×[P1]

K2/K1=2/2

K2/K1=1

K2=K1

So, the value of equilibrium constant remains same.

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The resulting temperature change is: 40 degrees c

Here given heat added to system 40kcl

Weight of water 1kg we know the specific heat of water is

S= 4.2 J/g \degree c=1 cal/g\degree c

Q=40kcal  m=1.0 kg=4000 g

We have the heat transfer equation given by

Q= ms\Delta t   where Q=heat energy   m=mass

\Delta t=change in temperature

Put the values and we'll have a change in temperature

\Delta t= [tex]\frac{Q}{ms}[/tex]

\Delta t= 40 degree C

Temperature is a numerical expression of how hot a substance or radiation is.

There are three different types of temperature scales: those that are defined by the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body, like the SI scale; those that rely only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are not defined by theoretical principles but rather by useful empirical properties of particulate matter.

A thermometer is used to determine temperature. It is calibrated using different temperature scales that historically defined themselves using different reference points and thermometric substances.

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The ph scale is based on the number of hydroxyls in the solution.

What are hydroxyls?

Chemistry and biochemistry both use the hydroxy group extensively. The chemical product generated on the largest industrial scale, sulfuric acid, among many other inorganic substances, contains hydroxy groups.

In the dehydration events that form lengthy chains out of simple biological molecules, hydroxy groups take part. A fatty acid's carboxy terminus loses its OH group when it is joined to glycerol to create a triacylglycerol. The carboxy group at the aldehyde end of one sugar loses its OH group when two aldehyde sugars are joined to create a disaccharide. The carboxy group of one amino acid loses the OH when a peptide bond is formed to join two amino acids to form a protein.

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Covalent bonds predicted from an atom of Silicon (Si) are Four covalent bonds.

Covalent bonds are generally formed by the non-metals. These bonds are formed when electrons are shared between the atoms. To know the number of covalent bonds in any atom, you must know the number of valence electrons.

Those elements which belong to the period 2 forms covalent bond as-

                                  8 - number of valence electrons.

Those elements which are from period 3, they form covalent bonds exactly same as the number of valence electrons.This is because d-orbitals are present in the period.

Silicon is the 14th element which belong to period 3. The electronic configuration of 1s² 2s² 2p⁶ 3s² 3p²

Just like Carbon (C), Silicon (Si) is tetravalent in nature, which means that it can easily share all four of its valence electrons and form covalent bonds. To become stable, Silicon(Si) will form four covalent bonds.

Silicon has four valence electrons, so it will form four covalent bonds.

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The molar mass of anthroquinone is 208g/mol. The empirical formula of anthraquinone is C₇H4O₁. And the molecular formula of anthraquinone is C₁₄H₈O₂

The empirical formula is only a ratio of the moles of the various chemicals expressed in whole numbers. They are the elements that make up the compound.

The total number of atoms of an element in a compound is indicated by the molecular formula. It is the total atoms.

Thus, the mpirical formula of anthraquinone is C₇H4O₁. And the molecular formula of anthraquinone is C₁₄H₈O₂.

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3 structural isomers can be drawn to represent the chemical formula C5H12.

When two or more organic compounds have the same molecular formula but different structures, they are said to be structural isomers, also referred to as constitutional isomers. The two molecules below share the same chemical formula, however they are distinct due to variations in the methyl group's placement.

It is an alkane, C5H12. There are 2 to the power (n-4)+1 isomers of an alkane, where n is the number of carbon atoms. Therefore, there are three structural isomers that might exist for C5H12 using the formula. They are methyl butane, n-pentane, and isopentane (dimethyl propane).

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It is true that metallic bonds are responsible for many properties of metals such as conductivity.

Metallic bond is a type of chemical bond.

Metallic bond is formed between electrons and positively charged metal ions.

Substances with metallic bond conduct an electric current in liquid and solid state, because they have mobile electrons.

Most metals (for example sodium, calcium, iron, silver) have strong metallic bond, because strong electrostatic attractive force between valence electrons (metals usually have low ionization energy and lose electrons easy) and positively charged metal ions.

Metallic bond increace electrical and thermal conductivity.

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Peptide bonds, hydrogen bonds, disulfide linkages, van der Waals, and electrostatic forces of attraction are the chemical bonds that stabilize the different structures in primary, secondary, tertiary, and quaternary structures.

The advanced structure of proteins gives rise to two kinds of major molecular shapes which are fibrous as well as globular structures. The main forces which are involved in stabilizing the secondary along with the tertiary structures of proteins include hydrogen bonds, disulfide type linkages, van der Waals attraction, and electrostatic forces of attraction.

The primary structure is generally determined by adjoining peptide bonds where the link is adjoining amino acids in sequential order. Tertiary structure is determined by the existence of disulfide bonds in between hydrophobic interactions as well as cysteine residues whereas the quaternary type structure is determined by multiple subunits of a protein that undergo various interactions.

Hydrogen bonds exist in a protein molecule as its large number can form between adjacent regions of the polypeptide chain in folded form and stabilize its three-dimensional kind of shape.

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Answer:

Which problem ??

Explanation:

Can you write your problem ??

A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol and the  molecular formula is C₂H₂ ethyne

Molecular formula of compound is (CH)n and the given molar mass is 26g/mol

Molar mass of (CH)n, C=12=n(12+1)=13n

So 13n and n=2

=13×2=26 and given molar mass is also 26g/mol

So here two carbon and two hydrogen so molecular formula is C₂H₂ and name is ethyne

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The compound with the most exothermic lattice energy in each of the following pairs of ionic substances is Ca3N2.

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Technique that are used to measure the freezing point of a solution is the osmometer it uses the solution's freezing point depression to put up its brawn. It is used to manage the level of osmotically felicitous body fluid in a lot of chemicals mixed in the blood operate the relationship which a mole of mixed substance lessen the freezing point of water(H2O) by 1.86 °C (35.35 °F).

The Rast method is also there.

Beckmann thermometer

When added to ice, salt first bring to an end in the film of liquid water that is always near by on the surface, thereby clouded its freezing point below the ices temperature. Ice in contiguity with salty water therefore melts, produce more liquid water, which mixed more salt, thereby lead to more ice to melt, and so on.

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The empirical formula of the metal iodide is Cr2I.

Mass of Chromium = 23.98

Molar Mass of Chromium = 51.9961

= 0.461 mol

Molar Mass of iodide = 126.9

= 199.6-23.88/126 = 1.394

The ratio between

Chromium and iodinei is1:2.So, the empirical formula is therefore Cr2I

Empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.[1] A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2. Thus, sulfur monoxide and disulfur dioxide, both compounds of sulfur and oxygen, have the same empirical formula. However, their molecular formulas, which express the number of atoms in each molecule of a chemical compound, are not the same.

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Mass of water is 45.2 grams.

Overall chemical equation for reaction of combustion a propane (C₃H₈):

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O.

m(C₃H₈) = 53.5 g; mass of the propane

m(O₂) = 15.0 g; mass of oxygen

m(CO₂) = 23.3 g; mass of carbon dioxide

m(H₂O) = ?; mass of water

Conservation of matter states that the mass of the reactants have to be equal to the mass of the products.

m(C₃H₈) + m(O₂) = m(CO₂) + m(H₂O)

53.5 g + 15.5 g = 23.3 g + m(H₂O)

m(H₂O) = 69.0 g - 23.3 g

m(H₂O) = 45.2 g; mass of water

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The chemical formulas and groups of the given minerals are as follow:

Quartz : Sio2 (Silicate)

Calcite : CaCO3 (Carbonate)

Pyrite : FeS2 (Sulfide)

Gold : Au (Native Elements)

Copper : Cu (Native Elements)

A piece of quartz can scratch a sample of calcite, however calcite can't scratch quartz. If you have a sample if each, attempt to scratch one sample with the other to look at the distinction in the hardness. You also can take a look at the hardness of these two minerals using a pocketknife.

Quartz is the second most abundant mineral in Earth's crust after feldspar. It occurs in nearly all acid igneous, metamorphic, and sedimentary rocks. It is an essential mineral in such silica-rich felsic rocks as granites, granodiorites, and rhyolites.

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The above statement is True.

Transmembrane proteins are the integral proteins, which helps ions and molecules to cross the membrane against the concentration gradient.

The transmembrane protein consist of both hydrophobic and hydrophilic amino acid side chains in his structure.

A membrane protein Is a protein molecule that is joined to or connected to an organelle’s or cell’s membrane. Depending on how the protein is connected to the membrane, membrane proteins can be divided into two categories, integral and peripheral membrane proteins.

The plasma membrane contains integral membrane proteins that are permanently ensconced there. They perform a variety of crucial functions like moving molecules through ion channels or transferring them across membranes.

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Your general impression suggests that your immediate action should be to call for additional help. The correct option is a.

Immediate actions are the actions that are taken without taking any time. These actions are taken when there is no time to think, and you should immediately think about the actions. The emergency condition needs immediate help.

During the time of general impression, one should immediately call for additional help. Additional people will give you suggestions for the problem.

Thus, the correct option is a. call for additional help.

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