4. [1 mark]
0.10 mol of hydrochloric acid is mixed with 0.10 mol of calcium carbonate.
2HCl (aq) + CaCO3 (s) → CaCl2 (aq) + H₂O (1) + CO2 (g)
Which is correct?

The ether C2H5OC2H5 has the following Lewis structure. The valence shell electrons of a molecule are depicted in a highly condensed manner in a Lewis structure.

C

|

H-C-H

|

O-C-H

|

H-C-H

|

H

Lewis structure, also referred to as electron-dot framework, is indeed a structural formula wherein the dots serve as placeholders for electrons; two dots between bonded ions signify a covalent link. Gilbert Newton Lewis, the man behind its 1916 introduction, gave it its name.

A molecule's valence shell electrons are shown in a very simple manner via a Lewis structure. It serves as a visual representation of how the electrons surrounding particular molecules' atoms are positioned. For bonds involving two atoms, electrons are displayed as "dots" or as a line.

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Answer: Heat energy can be transferred from one object to another because of a difference in temperature.

Explanation: Heat energy is transferred from a warmer to a cooler object through conduction, convection and radiation. All of these require a temperature difference for heat to transfer.

Answer:

Temperature difference

Every matter has heat energy. The result of the movement of minute particles known as atoms, molecules, or ions in liquids, solids, and gases is nothing but heat energy. Heat energy can be transferred by one substance to another and the flow because of the temperature difference between two objects is known as heat.

If the same reaction is carried out twice, once at high pressure and once at low pressure, the reaction at low pressure will have a shorter reaction time is referred to as a false statement.

This is referred to as the speed at which a chemical reaction takes place and is also the measure of the change in concentration of the disappearance of reactants or the change in concentration of the products.

Increase in the temperature and pressure will lead to a shorter reaction time while a decrease in the temperature and pressure will lead to a longer reaction time which is therefore why false was chosen as the correct choice.

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Answer: False.

Explanation: At higher pressures, there are more particles per unit volume. This means that they are closer together, so there will be more frequent successful collisions and a faster rate of reaction.

The frequencies and wavelengths of light in the emission spectrum of the Be3+ ion for the first three lines of each of the series that are analogous to the Lyman and the Balmer series are 48.8 eV, 97.6 eV, and 146.4 eV respectively, and wavelengths of 254 nm, 126 nm, and 84 nm respectively. This radiation lies in the ultraviolet region of the spectrum.

The frequencies and wavelengths of light in the emission spectrum of the Be3+ ion can be determined by calculating the energy of the electron in the ground state and in each of the excited states. The ground state energy of the ion is -13.6 eV.

The energy of the first three excited states of the ion is calculated by subtracting the ground state energy from the ionization energy, which is 13.6 eV. The frequencies and wavelengths of light of the three excited states are then calculated using the equation E=hv, where h is Planck's constant and v is the frequency of the light.

The wavelengths of light in the emission spectrum of the Be3+ ion for the first three lines of each of the series that are analogous to the Lyman and the Balmer series are 254 nm, 126 nm, and 84 nm respectively. These frequencies and wavelengths of light lie in the ultraviolet region of the spectrum.

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Complete question:

Be^3+ has a single electron. Calculate the frequencies and wavelengths of light in the emission spectrum of the ion for the first three lines of each of the series that are analogous to the Lyman and the Balmer series of neutral hydrogen. In what region of the spectrum does this radiation lie?

Answer 1

The average atomic mass in a.m.u of Element X given this information is 122.358.

Answer 2

Rutherford's experiment change the way scientists had previously viewed atomic structure as it provided insight into atomic structure.

Rutherford's experiment paved the way for subsequent changes up to and including the currently accepted quantum mechanical atomic model as his  model of the atom, the structure of the nucleus became more well-defined following the discovery of protons (1919) and neutrons (1932) as the particle constituents of the nucleus.

Answer 3

The percent abundance is related to the number fraction as fi = Pi/100  and used as in the formula written above in order to find average mass

Atomic structure refers to the structure of an atom comprising a nucleus (centre) in which the protons (positively charged) and neutrons (neutral) are present.

The average atomic mass in a.m.u of Element X given this information is ((121 * 43.2) + (123 * 53.1) + (129 * 3.70)) / 100

=5227.2 + 6531.3 + 477.3

=12235.8 / 100

122.358

Rutherford's experiment change the way scientists had previously viewed atomic structure as it provided insight into atomic structure, and Rutherford's model of the atom was proposed as a small, positive, massive nucleus contains the very vast majority of the mass of the entire atom with negatively charged electrons surrounding it at relatively large distances.

Rutherford's experiment paved the way for subsequent changes up to and including the currently accepted quantum mechanical atomic model as his  model of the atom, the structure of the nucleus became more well-defined following the discovery of protons in 1919 and neutrons in 1932 as the particle constituents of the nucleus.

It was during the 1920s that a "wave mechanical model" came along through the work of several physicists most importantly de Broglie, Heisenberg, and Schrodinger) and Bohr's concept of electrons "orbiting" the nucleus was abandoned in favor of "orbitals" which are more abstract probabilistic representations of electronic structure within an atom.

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Option (b) is correct. The shape of IF4 is seesaw geometry. This is a three dimensional arrangement determined by VSEPR theory.

According to the VSEPR theory, the shape or molecular geometry of a covalent structure is described by the three-dimensional arrangement of the bonding electron pairs around its central atom. We can determine the shape of a particular structure by using the valence shell electron pair repulsion, VSEPR theory. The seesaw geometry occurs when a molecule has a steric number of 5 with the central atom being bonded to 4 other atoms and 1 lone pair. An atom bonded to 5 other atoms forms a trigonal bipyramid with two axial and three equatorial positions but in the seesaw geometry one of the atoms is replaced by a lone pair of electrons which is always in an equatorial position. This is true because the lone pair occupies more space near the central atom than does a bonding pair of electrons.

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Personal computer is designed for the use of an individual to watch movies, surf the Internet, send e-mail, type a letter, or even compose your very own song.

2. Desktop computer is a type of computer that has greater power, storage, and versatility compared to other types of computers for personal use.

3. Laptop computer refers to the computer that combines all the components of a personal computer and is easy to carry around.

4. Ultrabook is a computers are lighter than laptops but with the same processing power and features.

5. Tablet computer is operated by using a touch screen that has a virtual keyboard, or an electronically-sensitive pad where users handwrite their notes.

Personal computer (PC) is a general term that refers to a computer that can be used by an individual for a variety of tasks such as watching movies, browsing the internet, sending emails, typing letters, and even composing music.

Therefore, Desktop computers are a type of personal computer that are designed for use at a fixed location. They have greater power, storage, and versatility compared to other types of computers for personal use. They generally have a separate monitor, keyboard, and processing unit, and are typically used for more demanding tasks such as gaming, video editing, and graphic design.

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Use the Henderson-Hasselbalch equation, The pH of the solution of (A), (B), and (C) is 7.52, 11.1828, and 4.6444 respectively.

A rough equation that depicts the link between a solution's pH or pOH, pKa or pKb, and the ratio of the concentrations of the dissociated chemical species is the Henderson-Hasselbalch equation. The equation requires knowledge of the acid dissociation constant.

(A) pH = Pka + log [Salt]/[Acid]

Pka of HClO = 7.46

∴ pH = 7046 + log 0.155/0.135 ⇒ pH = 7.52

(B) 1.05% C2H5NH2 by mass

weight of C2H5NH2 = 1.05 gm

gram molecular weight of C2H5NH2 = wt/G Mwt × n factor

⇒ 1.05/45 × 1

⇒ 0.0233

1.10 % C2H5NH3Br by mass

weight of C2H5NH3Br = 1.10 gm

Gram molecular weight of C2H5NH3br = 127

No. of equivalent of C2H5NH3Br = 1.10/127 × 1

⇒ 0.0086

It is a basic buffer

pH = 14-{Pka + log [C2H5NH3Br}/C2H5Nh2]}

pka for C2H5NH2 = 3.25

pH = 14 - { 3.25 + log [0.0086]/0.0233}

⇒pH = 14- { 3.25 + (-0.4328)

⇒pH = 14.4328-3.25

⇒pH = 11.1828

(C) weight of HC2H3O2 (CH3COOH) = 10.0g

Equivalent weight of Hc2H3O2 = 60

Normality of HC2H3O2 = wt/GM weight × 1000/Vml

⇒ 10/60 × 1000/150

⇒ 100/90 = 1.1111 N

Weight of NaC2H3O2 (CH3COONa)= 10.0g

Equivalent weight of NaC2H3O2= 82

⇒N= 10/82 × 1000/150

⇒1000/1230 = 0.8130 N

It is a Acidic buffer

pka for CH3COOH = 4.78

pH = pka + log [NaC2H3O2]/HC2H3O2}

⇒pH = 4.78 + log (0.8130)/1.1111

⇒pH = 4.78 + log (0.7317)

⇒pH = 4.78 + (-0.1356)

⇒pH = 4.78 -0.1356

⇒pH = 4.6444

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The device that is most famously used to find the molecular weight of a compound is a mass spectrometer.

A mass spectrometer is an analytical instrument that is used to measure the mass-to-charge ratio of charged particles. It works by ionizing a sample of the compound, accelerating the ions, and then measuring their masses using a magnetic or an electric field. The resulting mass spectrum can be used to determine the molecular weight of the compound, as well as its elemental composition and isotopic distribution. Mass spectrometry is widely used in chemistry, biochemistry, and other fields to identify and quantify molecules, and it is considered one of the most accurate and precise methods for determining molecular weight.

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Answer:

Bicarbonate is naturally produced by the reaction of carbon dioxide (CO2) with water. (H2O) to produce carbonic acid (H2CO3), which dissociates to a bicarbonate ion and a. proton (H. + ).

No, it is a physical change. Changing states is physical. A chemical change is to change the nature of something by changing it's chemical makeup.

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Answer: Only chemically.

Explanation: A compound is a pure substance composed of two or more different atoms chemically bonded to one another. That means that it can not be separated into its constituents by mechanical or physical means and only can be destroyed by chemical means.

Answer: 0.277g of disodium tetra oxo sulphate (vi) will be dissolved in 100g of water, if the mole fraction of Na2So4 is 0.039. ✅

PLEASEEEE GIVE BRANLIEST

Explanation:

The mass of a solute dissolved in a solvent can be calculated using the formula:

mass of solute = mole fraction of solute x mass of solvent / molar mass of solute

In this case, we are trying to find the mass of disodium tetra oxo sulphate (vi) (Na2SO4) dissolved in 100g of water, with a mole fraction of 0.039.

mass of Na2SO4 = (0.039) x (100g) / (142.04 g/mol)

mass of Na2SO4 = 0.277 g

So, 0.277 g of disodium tetra oxo sulphate (vi) will be dissolved in 100g of water, if the mole fraction of Na2So4 is 0.039. ✅

0.310 moles of [tex]Cl_{2}[/tex] are present in the container, according to the reaction. This is the answer to the given question.

Carbon tetrachloride is a manufactured chemical that does not occur naturally. It is a clear liquid with a sweet smell that can be detected at low levels. It is also called carbon chloride, methane tetrachloride, perchloromethane, tetrachloroethane, or benziform. Carbon tetrachloride molecules have tetrahedral molecular geometries in which the central carbon atom is bonded to four chlorine atoms.

The liver and kidneys are harmed by acute exposure to high quantities of carbon tetrachloride in drinking water. Headache, lightheadedness, fatigue, sluggishness, and impaired vision are further signs. Extremely high doses can also result in death, vomiting, or stomach pain.

(0.4) (25) = (0.0821) (n) (120+273)

Moles of [tex]Cl_{2}[/tex],n = 0.310 mol

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There are two stereoisomers possible for 2-chloro-2,3-dimethylpentane with two chiral carbons. Yes, this indicates that the compounds can exist in optically active form.

Optical isomerism is most common in substances that have the same molecular and structural formula but they cannot be superimposed on one another. Stereoisomers that rotate the plane of polarized light typically exhibit optical isomerism.

Chiral carbons are those that lack a plane of symmetry and have distinct attached groups.

Achiral molecules have a plane of symmetry and all of the groups attached to the central carbon atom are the same.

Molecules with chiral centers exhibit optical isomerism and may exist in an optically active form.

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Answer:

rust proof

Explanation:

Answer:

Cell division

Explanation:

the complementary strands of DNA formed during cell division

Calculating the amount of product that can be formed by each reactant

Since we have of hydrogen gas, we have more than enough to react all of the nitrogen gas, and the nitrogen gas will be used up before the hydrogen gas. As a result, nitrogen gas is the limiting reactant.

1.2mol Na x (2mol NaBr/2mol Na) = 2 mol NaBr***Limiting

2mol Br2 x (2mol NaBr/1mol Br2) = 2 mol NaBr

2. 1.8mol Na x (2mol NaBr/2mol Na) = 1.8 mol NaBr**Limiting

1.4mol Br2 x (2mol NaBr/1mol Br2) = 2.8 mol NaBr

3. 2.5mol Na x (2mol NaBr/2mol Na) = 2.5 mol NaBr

1mol Br2 x (2mol NaBr/1mol Br2) = 2 mol NaBr***Limiting

4. 12.6mol Na x (2mol NaBr/2mol Na) = 12.6 mol NaBr***Limting

6.9mol Br2 x (2mol NaBr/1mol Br2) = 13.8 mol NaBr

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The answer is A [Ar]3d¹04s²4p4. This electron configuration represents the element Argon, which has the lowest electronegativity of the elements listed. Electronegativity is a measure of an atom's ability to attract electrons, so Argon has the lowest ability to do so.

Electron configuration is an arrangement of electrons in an atom or molecule in which each orbital is occupied by the maximum number of electrons with opposite spins. It describes the way that electrons are distributed among the available orbitals of an atom. Electron configuration is important because it determines the chemical properties of the atom, including reactivity and the way it bonds with other atoms. The distribution of electrons in an atom or molecule is determined by the quantum numbers associated with each electron. These quantum numbers indicate the energy, angular momentum, and other properties of the electrons. The electron configuration of an atom or molecule is determined by solving the Schrödinger equation for that particular atom or molecule.

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Answer:

The answer is 20.3 g.

Answer:

That is 2.38 divided by Moller Mosque. That is 149

Hope tht helped :)

The reaction is:
C + Fe2O3 → CO2 + Fe
Given:
Mass of C = 38.9 g
38.9 g C x (1 mol C / 12.011 g C) = 3.239 mol C
Since 1 mol C will produce 1 mol CO2 in the reaction, the number of moles of CO2 formed is 3.239 mol.

Mole is a unit of measurement used in chemistry to measure the amount of a substance, usually in terms of its mass. One mole of a substance is equal to its molecular weight in grams. The term originated from the Latin word ‘moles’, which means ‘mass’. Moles are commonly used to measure the amount of a substance in a given volume.

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To solve this problem, you can use a serial dilution method to achieve the desired final concentration of the chemical substance in the solvent.

First, determine the amount of solvent you need to dissolve the 5mg of the chemical substance. Since the solubility of the chemical substance is 2g/L, you need to use 2.5L of solvent (5mg / 2g/L = 2.5L).

Next, create a stock solution by dissolving the 5mg of the chemical substance in 2.5L of solvent. This will give you a stock solution with a concentration of 2mg/L.

Then, create a series of dilutions from the stock solution to achieve the desired final concentrations of 10ug/L and 100ug/L. You can do this by taking a certain volume of the stock solution and adding an equal volume of solvent to it. This is known as a 1:1 dilution and will reduce the concentration by half.

To create a 2:3 dilution, you can take 2 parts of the stock solution and add 3 parts of solvent. By doing so, you can use the stock solution to create a series of dilutions, each with a lower concentration than the previous one, until you reach the desired final concentrations of 10ug/L and 100ug/L.

Finally, you can measure the volume of the solution needed to add to the final solution between 5ul to 10ul. It's important to keep in mind that the accuracy of this method depends on the precision of the measurements taken, especially when working with very low concentrations.

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Answer:

Below

Explanation:

For 8 slices of bread   you need  

8 eggs<==== you do not have enough ( enough for 6 slices)

 2 cups of milk <====== you do not have enough  ( enough for 4 slices)

  2 tsp of ground cinnamon  <==== you do not have enough ( enough for 3)

   2 tsp of ground nutmeg <===== you do not have enough (enough for 4)

SO ALL of the ingredients are limiting ingredients for the 8 slices of bread

  you will run out of cinnamon first  <==it is the MOST limiting  

Answer: B ground cinnom

Explanation:

Bohr thought that electrons orbited the nucleus in circular paths; whereas in the modern model atomic electron structure is more like 3D standing waves.

Bohr improved on Rutherford's atomic model. The majority of the atom's mass is concentrated in its nucleus, which we now refer to as the center of the atom, and electrons surround the positive mass in a manner akin to a cloud. Bohr's use of the quantified energy to explain the model was his most important contribution. According to his theories, electrons around the nucleus have quantized potential and kinetic energy.

The model's quantification component is still thought to be sound in theory. The concept of electrons in circular orbits is the main issue. This violates the Heisenberg uncertainty principle, which states that it is impossible to simultaneously know a particle's position and momentum. Additionally, it does not eliminate the fact that atoms have a 3D formation. If the orbitals are circular, the 3D structure of an atom is not probable.

It was demonstrated that a standing wave energy level model fitted to the emission and absorption spectra of hydrogen using Schrödinger's equation. The distribution of electrons surrounding the nucleus is now described by scientists using the concept of a probability cloud.

Because the probability clouds only depict the likelihood of finding an electron in a given location and not its certainty, they are in compliance with the Heisenberg uncertainty principle. You may also see the clouds' standing wave-like shape if you look closely. Take a look at this illustration of the probability clouds for hydrogen.

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The mass of 6.02211023 platinum atoms is 195.08 g.

What is the purpose of platinum?

Jewelry is frequently made of platinum. However, catalytic converters for vehicles, trucks, and buses are where it is primarily used. Each year, this meets around 50% of the need. The conversion of engine emissions into less dangerous waste products is made possible by platinum.

What materials make up platinum?

Six isotopes make up natural platinum: platinum-190 (0.012%), platinum-192 (0.782%), platinum-194 (32.86%), platinum-195 (33.78%), platinum-196 (25.21%), & platinum-198 (7.36 percent). With the exception of platinum-190, that has been described as just a long-lived alpha emitter, all are stable.

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Answer:

The answer is 6.022 * 10^23 atoms

Explanation:

Six and twenty-two thousandths times ten to the twenty-third power atoms.

The line which has the wavelength of 590 nm in the sodium emission spectrum is yellow light whose frequency in the spectrum of sodium is 5.09×1014 sec−1.

To explain this let’s understand that the speed of light is equal to the product of wavelength and frequency.

Speed of light i.e. c =3⋅10^8ms

Also the wavelength(v) = 590 nm/5.9⋅10−7m

Now putting the formula we can state that v=cλ

Using all this together we can find λ i.e. frequency will be division of wavelength by speed of light and the answer will be =5.09×1014 sec−1

(5.9*10-7m/ 3.10^8 ms)

The emission spectrum of any chemical element/compound helps us in understanding the frequencies of electromagnetic radiation whose emission is due to an atom/molecule which transits from any high energy state to the lower energy state.

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The following substances may have IR absorptions between 3000 and 2850 cm-1 and between 1725 and 1705 cm-1, approximately.

The interplay between the molecular polarity transition moments associated with the molecular vibrations and the IR applied electric vector, in general, is what causes IR absorption. An electric field vector as well as the dipole changeover moment are parallel when absorption is greatest.

In the potential vibrational and rotational modes, only molecules with minor energy differences can absorb IR. The oscillations or rotations inside a molecule must result in a net shift in the molecule's dipole moment in order for it to absorb IR.

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The mass of oxygen that must react is 182 g to form 3.80 mol Al₂O₃.

The molar mass of the substance is the sum of the atomic masses of the individual constituent atoms of the compound or molecule, whereas the mass of the substance is its weight.

The chemical process is depicted as follows:

4Al+3O₂⇒2Al₂O₃

According to the process, 3 moles of oxygen are needed to create 2 moles of aluminum oxide, hence 3.80 moles of aluminum oxide will require x moles of oxygen.

moles oxygen = 3/2 x  3.80 moles of aluminum oxide

moles oxygen = 5.7 moles

mass oxygen = moles x mass molar

mass oxygen = 5.7 x 32 g/moles= 182.4 g

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The mass of the Ag formed is 1080 g.

Since we do not have the equation of the reaction, it means that we have to write down the equation of the reaction by ourselves so that we can be able to answer the question and we have;

[tex]2AgNO_{3} + Zn ----- > Zn(NO_{3} )_{2} + 2Ag[/tex]

We have that zinc is the limiting reactant so;

If 1 mole of zinc forms 2 moles of Ag

5 moles of zinc forms 5 * 2/1 = 10 moles of Ag

Mass of the Ag = Number of moles * molar mass

= 10 moles * 108 g/mol

= 1080 g

The mass of the silver is 1080 g

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