A 13.9 - g piece of metal ( specific heat capacity is 0.449 /g^ C)who whose temperature is 54.2 degrees * C was added to a sample of water at 13.4 degrees * C in a constant - pressure calorimeter of negligible heat capacity . If the final temperature of the water is 15.6 °C, calculate the mass of the water in the calorimeter .​

Answer:

6

Explanation:

the sig figs are 850320

237 nm is slightly lower than the experimentally observed value of 240 nm, which suggests that the estimation of the length of the π-network by adding bond lengths for this molecule is relatively accurate.

Step 1:

To calculate the energy levels of the π-network in hexa-triene, C6H8, using the particle in the box model, we need to first calculate the box length of the molecule. Assuming that the molecule is linear, we can use the values 135 and 154 pm for σ and π bonds, respectively. The box length for this molecule is then given by 289 pm.

Step 2:

To calculate the wavelength of light required to induce a transition from the ground state to the first excited state, we need to use the equation:
λ = h/√2mEL
where h is Planck’s constant, m is the particle’s mass, E is the energy difference between the ground and first excited state, and L is the box length of the molecule.

step 3:

Using the values above, we can calculate the wavelength of light required to induce a transition from the ground state to the first excited state as 237 nm. This is slightly lower than the experimentally observed value of 240 nm, which suggests that the estimation of the length of the π-network by adding bond lengths for this molecule is relatively accurate.

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answer:

as per the formula of given carbohydrate the answer is 15 moles

explanation:

The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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Answer:

copper is the only material composed of a single pure substance

Explanation:

plss mark brainliest

Answer:

1st opt.

(copper is the only material consisting of a single pure substance)

Explanation:

an element is made up of only one type of atom, and copper (Cu) as you can see is a single pure atom whereas salt (NaCl) and vinegar (C2H4O2) are both made of different elements.

Hope this helps

The empirical formula of a sample of a compound that contains 72.0 g of C. 18.0 g of H, and 28.0 g of N is C₃H₉N.

Empirical formula is the notation indicating the ratios of the various elements present in a compound, without regard to the actual numbers.

The empirical formula of a compound can be calculated as follows:

C = 72.0g

H = 18.0g

N = 28.0g

Next, we divide by the atomic mass of each element as follows:

Next, we divide by the smallest mole as follows:

The empirical ratio is 3:9:1, hence, the empirical formula of the compound is C₃H₉N.

The options to the incomplete question are as follows:

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The reaction is a substitution reaction since bromide ion was replaced by hydroxide ion.

A chemical reaction is a change which results in a the permanent rearrangements of the atoms and constituents of a substance such that new substances are formed.

The given reaction is a as follows:

\(CH_3Br (aq) + OH^{-} (aq) \rightarrow CH_3OH (aq) + Br^{-} (aq) \\ \)

Bromide ion was replaced by hydroxide ion.

Therefore, the reaction is a substitution reaction.

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Answer: D-substitution

Other person is right its

Explanation:

When 2.45 grams of sugar are dissolved in 200.0 grams of water, the mass percentage of sugar in the solution is 1.21%.

Mass Percent-

The concentration of chemical substances in solutions can be stated in a variety of ways. While the molar concentration refers to the quantity of moles of the solute in the solution, the mass concentration refers to the mass of the solute per unit volume of the solution. The mass percent of the solute in the solution is expressed as a percentage. While molar and mass concentrations have units of measurement, mass percent has none.

The total mass is 202.45 gms when 2.45 grams of sugar are dissolved in 200.0 grams of water. According to the definition and idea of the mass percent, such a solution would have a sugar content of (2.45 /202.45) 100 = 1.21% sugar.

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The "convergent plate boundary" is the kind of plate boundary that the student is simulating.

This zero-width check between two letters identifies a word boundary. A word character and a non-word letter must be present for the test to be successful. Each figure must appear on one side, regardless of which side they are on.

For illustrate, the "three little pigs" went to the market. Indivisibility: Specify a statement and request that someone "add extra words" to it. This additional item will be entered between the words, not before or after them.

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Answer:

a collection device in the area that counts the number of mosquitoes caught weekly

Explanation: just bcuz

The mass of oxygen that reacted with butane to give 2.2 kg of carbon dioxide and 1.125kg of water  is  5.2kg

A chemical equation is a symbol-and-formula-based symbolic representation of a chemical reaction, with the reactant entities supplied on the left and the product entities are given on the right.

Simply divide the substance's stated weight by its molar mass to get how many moles of any particular substance is present in the sample.

According to the given question,

Molar mass of CO₂ = 12+(16×2)

                               =44 g/ mol

Weight of CO₂ = 2.2 kg= 2200 g

Therefore,

The number of moles of CO₂ formed

= 2200/44= 50 moles

From the given chemical equation we can deduce that 8 moles of CO₂ is given by 13 moles of oxygen.

By using the unitary method of calculation,

8 moles of CO₂ given by 13 moles of O₂

50 moles of CO₂ given by = (13×50)/8

                                         = 81.25 moles

Similarly for H₂O,

Molar mass = 18 g/mol

Number of moles= 1125/18

                          = 62.5 moles

10 moles of H₂O given by 13 moles of O2

62.5 moles of  H₂O given by

= (13×62.5)/10

 = 81.25 moles

Therefore the total moles of Oxygen that reacted with butane is 162.5

Thus the mass of oxygen that reacted with butane is (162.5×32)= 5.2kg

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Answer:

0.756 J

Explanation:

Temperature change (delta T) = 0.855 degrees Celsius

Mass of water (m) = 0.2067 g

Specific heat capacity of water (c) = 4.28 J/g degrees C

Heat added = m * c * delta T

= (0.2067 * 4.28 * 0.855) J

= 0.756 J

Chloride ions outside the neuron would make it very difficult for a depolarization to occur.

In a normal resting state, the internal environment of a neuron has a net negative charge compared to the external environment.

This is known as the resting potential. During depolarization, this membrane potential switches from negative to positive very rapidly due to an influx of positively-charged cations (such as sodium) into the cell.

To interfere with this process, the ions outside of the neuron would have to shift the normal resting state so that the internal environment of the cell no longer has a net negative charge.

This will prevent the influx of cations that will cause depolarization. In order to do this, we would need to balance out the negative charge inside the cell with negative charge outside of the cell. In the list of options, chloride is the only negatively-charged ion. Therefore, the answer would be Chloride.

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The largest value of n that can be reached considering conservation of energy when a 12.3 eV electron collides with a hydrogen atom at rest in its ground state, exciting the electron to a higher energy level is n= 2.

When a hydrogen atom is excited, it absorbs a photon and one of the electrons goes to a higher energy level. When an electron in an excited atom returns to a lower energy state, it releases a photon with a specific wavelength.

The energy absorbed by the hydrogen atom when it is excited is given by:ΔE = Ei - Efwhere Ei is the energy of the initial state, and Ef is the energy of the final state.In this situation, the electron has an energy of 12.3 eV, which is greater than the ionization energy of the hydrogen atom (13.6 eV).

As a result, the hydrogen atom cannot be ionized, but the electron can be excited to a higher energy level using this energy. The maximum value of n that can be reached with this energy can be determined by equating the energy of the initial state to the sum of the ionization energy and the energy of the final state.

The energy difference can be computed as follows:ΔE = Ei - Ef= 12.3 eV - 10.2 eV= 2.1 eVwhere Ef is the final state energy, which corresponds to the energy of the nth state of the hydrogen atom.

When we solve for n, we get:

n² = ΔE/13.6 eV= 2.1 eV/13.6 eV= 0.154n = √(0.154)= 0.392

Therefore, the maximum value of n that can be reached is n= 2 (i.e., the second energy level).

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The described process is the six-electron reduction of Cr3+ ions to solid chromium (Cr) and solid selenium (Se). We can determine the accuracy of the following claims using the information provided:

G > 0: Under normal circumstances, the reaction is not spontaneous because it entails reducing Cr3+ ions to Cr, which requires energy input. G is hence positive.

S > 0: Without extra system knowledge, it is challenging to discern the sign of S. The total change in entropy (S) may, however, be little or even negative because the reaction results in the production of two solid products from two watery reactants.

Since G is positive, the reaction is reactant-favored and not product-favored. The claim that "The reaction is reactant-favored" is thus true.

Since the reaction involves the transfer of six electrons from Cr3+ to Se, the statement "n = 6 mol electrons" is accurate.

G > 0: Since the reaction is not spontaneous under normal circumstances, G is higher than zero.

The appropriate answers are thus:

The reaction is reactant-favored.

n = 6 mol electrons.

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The correct answer is to balance the half-cell reaction.

Either an oxidation process, in which electrons are lost or a reduction reaction, in which electrons are gained, is a half-cell reaction. The processes take place in an electrochemical cell where the electrons are consumed at the cathode during reduction and lost at the anode during oxidation. Galvanic and voltaic cells, in which electrons move from the anode to the cathode through an electrolyte to create an electromotive force, can benefit from half-cell processes (EMF). Oxidation-reduction On metal surfaces, half-cell reactions can also happen and result in corrosion. An electrochemical cell experiences half-cell reactions, which produce an excess or deficiency of electrons. The transport of electrons requires the presence of both the donor and receiver.

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Answer:

1.58L

Explanation:

Given parameters:

Initial volume  = 1.2L

Initial temperature  = 28.5°C  = 28.5 + 273  = 301.5K

Final temperature  = 125°C  = 125 + 273  = 398K

Unknown:

New volume  = ?

Solution:

Volume and temperature relationship is resolved using the Charles's law.

The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the the pressure is constant".

So;

       \(\frac{V1}{T1}\)    = \(\frac{V2}{T2}\)  

V1 is the initial volume

T1 is the initial temperature

V2 is the new volume

T2 is the new temperature

             \(\frac{1.2}{301.5}\)    = \(\frac{V2}{398}\)    

              301.5V2  = 477.6

                       V2  = 1.58L

Five observable properties for separating mixtures are particle size, colour, texture, shape, magnetic attraction.

Mixtures are compounds that are made up of two or more chemical compounds which are not linked to each other chemically. They can be easily separated.

The mixtures can be separated by properties like particle size, colour, density, shape, magnetic attraction.

Sieving can be used to separate compounds based on particle size. Chromatography can be used to separate compounds based on colour as each colour would have differences in properties. Flotation can be used to separate compounds based on density like oil in water. Centrifugation can be used to separate compounds based on shape. Magnetic separation can be used to separate metals from non-metal compounds in a mixture.

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According to Charle's law, the volume of the given mass of a gas is directly proportional to its absolute temperature provided that the pressure is constant. Mathemically;

where;

V1 and V2 are the initial and final volume of the gas

T1 and T2 are the initial and final temperatures of the gas (in Kelvin)

Given the following parameters:

Substitute the given parameters into the formula;

Therefore the volume of the gas at 20°C is approximately 97.67cm³

Answer:

low melting point, high density, and acid resistance

Explanation:

Answer:

transports water froom roots to the rest of the plant

Explanation:

Answer:

The most likely atom involved in coordination of calcium ions found in HRP is oxygen (D).

The given statement "Carbon in the ocean originates from the atmosphere" is true because Carbon is one of the most vital elements on Earth and is involved in various biogeochemical cycles, including the carbon cycle.

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The correct question would be as

Carbon in the ocean originates from the atmosphere. Please select the best answer from the choices provided. True or False

Answer:

i think its a if not sorry i have it in a test right now

Explanation:

The kinetic energy is 3e7 eV

The structure of alpha particles, also known as alpha rays or alpha radiation, is similar to that of the helium-4 nucleus and is made up of two protons and two neutrons bonded together. They can also be created in various ways, although typically they are created during the alpha decay process.

The Greek letter "alpha" serves as the inspiration for the naming of these particles. The alpha particle is represented by the symbols or 2+. They are also sometimes written as He2+ or 4 2He2+, denoting a helium ion with a +2 charge, because they are similar to helium nuclei (missing its two electrons). The alpha particle transforms into a typical (electrically neutral) helium atom 4 2He after the ion absorbs electrons from its surroundings.

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Answer: Ionic attractions

Explanation:

Ionic bonding is a type of chemical bond that involves the electrostatic attraction between oppositely charged ions.

solubility

Explanation:

because solubility is the ability to dissolve especially by using water.