Consider the following molecular shapes. (a) Which has the most electron pairs (both shared and unshared) around the central atom?

200ml of NaOH is required to reach the equivalence point.

Titration is a standard quantitative chemical analysis laboratory method for determining the concentration of a specified analyte. The titrant or titrator is a reagent that is produced as a standard solution of known concentration and volume. Titration is an essential technique in analytical chemistry, and it is also known as volumetric analysis.

A chemical reaction's equivalence point, also known as the stoichiometric point, is the point at which chemically equivalent quantities of reactants have been combined. The equivalence point for an acid-base reaction is the point at which the moles of acid and base would neutralise each other according to the chemical reaction.

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The structure 1s2 2s2 2p5 of fluorine, on the other hand, demonstrates that it has seven valence electrons.

A definition of electronic configuration is the orderly placement of an atom's electrons into its orbitals. Every element's distribution follows a set pattern. Every element has an atomic number, which is a fixed number of protons. In an atom, there are exactly as many protons as electrons.

Electron configurations define the arrangement of electrons around an atom's nucleus. Lithium, for instance, contains two ions in the c-1 subshell and one electrons in the 2s subshell, according to its electron configuration, 1s22s1.

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Answer:

17.76 cm x 9.21 cm x 4.45 cm = 727.9 cc. Calculate the weight of the gold bar using the density of gold, which is: 19.3 g/cc. Use the density ...

1. Ionic compounds are formed by the transfer of electrons that are positively and negatively charged, whereas, covalent compounds are formed by sharing the electrons. 2. In an ionic compound, bonding involves a metal and nonmetal, whereas, in the covalent compound, bonding is between nonmetals.

The 2s orbitals should the basketball represent this,mrs. johnson, a chemistry teacher, was describing to her students the shapes of the orbitals of electrons. if she were making a model using a softball and a basketball and was trying to show the difference between the 1s orbital and the 2s orbital

Carbon (C) would have its valence electrons in the s and p orbitals.

Due to its atomic number of six, carbon has a valence electron of four.

According to Hund's rule of maximal multiplicity, the order of orbitals in terms of electron dispersion is s, p, d, and f. It asserts that lower energy orbitals are filled and paired first, followed by higher energy orbitals.

uncomplicated non-sterile substance An antacid liquid, lidocaine, and diphenhydramine solution must be combined to make magic mouthwash. These components are all oral formulations that contain water.

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Gaseous ethane and ethene have formation enthalpies of 52 kJ mol-1 and -85 kJ mol-1 at 298 K, respectively. The process's endothermic reaction of reactions at 298 K is -137 kJ mol-1.

Ethene is largely utilized as a monomer in the manufacture of plastics, to create other compounds, and as an industrial fuel gas worldwide. Ethene is used in Canada to mature bananas and some other tropical fruits after harvesting, as well as to level citrus.

Historically, hydrocarbons was used to produce ethylene, but natural gas is now being used more and more instead. Steam cracking, a procedure that decomposes petroleum through refining, is the main way to produce ethylene.

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The amplitude of a seismic wave usually decreases as the wave moves away from the epicenter due to the phenomenon of wave attenuation.

There are several factors that contribute to this attenuation:

Geometric Spreading: As the seismic wave propagates outward from the earthquake's epicenter, it spreads out over a larger area, resulting in the energy being distributed over a larger volume. This causes the amplitude of the wave to decrease with distance. According to the inverse square law, the intensity of the wave decreases with the square of the distance from the source. Absorption and Scattering: The seismic wave encounters various materials and geological structures as it travels through the Earth. These materials can absorb and scatter the energy of the wave, causing a reduction in its amplitude. Different types of rocks and soil have varying levels of attenuation, leading to differences in the decrease of wave amplitude.

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The number of different uncharged (neutral) stable hydrogen atoms which one can build is two and the similarity is that they both have a single proton while the difference is that one has a neutron while the other has zero neutron.

This is referred to as the smallest particle of an element which can exist and has subatomic particles such as proton and neutron.

The different uncharged (neutral) stable hydrogen atoms which one can build include:

From this we can infer that they both have one proton and electron and one has no neutron while the other has just one.

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Answer:

False

Explanation:

The earth goes around the

Answer:

False

Explanation:

The Earth revolves around the sun.

The partial pressure of oxygen in the container is 153 torr. According to Dalton's Law of Partial Pressures, the total pressure in a container is equal to the sum of the partial pressures of each gas present.

To calculate the partial pressure of oxygen in the container, we need to subtract the partial pressures of nitrogen and carbon dioxide from the total pressure:
Partial pressure of oxygen = Total pressure - Partial pressure of nitrogen - Partial pressure of carbon dioxide
Partial pressure of oxygen = 760 torr - 595 torr - 12 torr
Partial pressure of oxygen = 153 torr


According to Dalton's Law of Partial Pressure, the total pressure of a gas mixture is equal to the sum of the partial pressures of each individual gas in the mixture. In your case, you have a mixture of nitrogen, carbon dioxide, and oxygen gases with a total pressure of 760 torr. The partial pressure of nitrogen is 595 torr, and the partial pressure of carbon dioxide is 12 torr.

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Evaporation is the process by which a liquid converts into a gas or vapor at a temperature below its boiling point. Latent heat of fusion is the amount of heat required to convert a solid into a liquid without any change in temperature.  Steam causes more severe burning as compared to boiling water at 100°C due to the large amount of latent heat of vaporization.

On the other hand, boiling is the process by which a liquid turns into a gas or vapor at a temperature equal to or above its boiling point. In other words, when the liquid is heated to a temperature equal to or greater than its boiling point, it turns into a gas or vapor. The effect of humidity on the rate of evaporation is that if the air around the liquid is already humid, then the rate of evaporation will be slower because the air is already saturated with water molecules.
Latent heat of fusion is the amount of heat required to convert a solid into a liquid without any change in temperature. In other words, it is the amount of heat required to break the intermolecular forces between the molecules of a solid to convert it into a liquid.
Steam causes more severe burning as compared to boiling water at 100°C because steam contains a large amount of latent heat of vaporization. When steam comes in contact with the skin, it releases a large amount of latent heat of vaporization, which causes more severe burns as compared to boiling water at 100°C.

Evaporation is the process of turning a liquid into a gas or vapor at a temperature below its boiling point. Boiling, on the other hand, is the process of turning a liquid into a gas or vapor at a temperature equal to or above its boiling point. Humidity affects the rate of evaporation. Latent heat of fusion is the amount of heat required to convert a solid into a liquid. Steam causes more severe burning as compared to boiling water at 100°C due to the large amount of latent heat of vaporization.

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Across the periodic table, there are predictable variations in the initial ionization energy. The ionization energy grows from left to right during the course of a period and drops from top to bottom in groups. As a result, helium has the highest initial ionization energy while francium has one of the lowest.

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Answer:

5

Explanation:

The correct coefficient of oxygen is 5.

The question is incomplete, the complete question is;

Examine the chemical reaction C3H8 + O2---->  4H2O + 3CO2. What coefficient of O2 should be added so the number of atoms of oxygen is conserved on both sides of the reaction equation?

A: 3

B: 5

C: 7

D: 10​

The principle of balancing chemical reaction equation is that the number of atoms of each element at the right hand side of the reaction equation must be equal to the number of atoms of the same element at the left hand side of the reaction equation.

Given the reaction;  C3H8 + O2---->  4H2O + 3CO2, it will only become balanced when the coefficient of O2 is 5.

Hence, we can write; C3H8 + 5O2---->  4H2O + 3CO2

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Answer:

\(\boxed {\boxed {\sf 120 \ or \ 117 \ grams \ H_2O \ depending \ on \ significant \ figures }}\)

Explanation:

We want to convert from moles of water to grams of water.

First, find the molar mass of water (H₂O) Look on the Periodic Table for the masses of hydrogen and oxygen.

Next, add up the number of each element in water. The subscript of 2 comes after the H, so there are 2 moles of hydrogen.

Finally, add the molar mass of 2 hydrogen and 1 oxygen.

Next, find the grams in 6.5 moles.

Use the molar mass we just found as a ratio.

\(molar \ mass \ ratio: \frac{18.015 \ g \ H_2O}{1 \ mol \ H_2O}\)

We want to find the grams in 6.5 moles. We can multiply the ratio above by 6.5

\(6.5 \ mol \ H_2O * \frac{18.015 \ g \ H_2O}{1 \ mol \ H_2O}\)

Multiply. Note that the moles of H₂O will cancel each other out.

\(6.5 * \frac{18.015 \ g \ H_2O}{1}\)

\(6.5 * {18.015 \ g \ H_2O}\)

\(117.0975 \ g \ H_2O\)

If we want to round to the technically correct significant figures, it would be 2 sig figs. The original measurement, 6.5, has 2 (6 and 5).

\(\approx 120 \ g \ H_2O\)

Answer:

The cathode is the electrode where reduction takes place.

so

reduction occur in Cathode in an electrochemical cell.

Answer: Cathode

Explanation:

.

Step 1 - Finding the molar mass of glycine

The molar mass of glycine can be found by multiplying the molar mass of each element by the number of times it appears in the formula and then summing it all up.

For glycine, we find the molar mass of 75.07 g/mol.

Step 2 - Interpreting the meaning of molar mass

The molar mass gives us the total mass of one mole of that substance. Let's take water as an example: its molar mass is 18 g/mol, which means one mole of water would weight 18 g, two moles 36 g and so on.

For glycine, therefore, one mole weights 75.05 g.

Step 3 - Finding the number of moles

To find the number of moles, we can use a very simple formula relating mass (m), molar mass (M) and number of moles (n):

Therefore, there are 1.77*10^(-2) moles in 1.332 g of glycine.

Answer:

Water is a special element because it is the one main source that keeps us alive

Explanation:

Water can be solid or liquid

By the process of natural selection, individuals in Finch 1 will evolve over time to resemble individuals in Finch 2.

Natural selection is the process by which individuals who possess certain features or structures that make them better suited to their environment are able to survive and reproduce in their environment while those who do not have such features die off.

Since the preferred food for Finch 1 has become scarce due to drought, individuals in Finch 1 who have features that enable them eat larger seed will be naturally selected for survival , most population in Finch will be composed of such individuals.

Therefore, natural selection will cause individuals in Finch 1 to evolve over time to resemble individuals in Finch 2.

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Answer:

Increasing the temperature increases reaction rates because of the disproportionately large increase in the number of high energy collisions.

Explanation:

Hope this helps :)

Shortest wavelength of light that can be emitted by a hydrogen atom is 95.0 nm

Emission is the transfer of electron from higher energy level to lower energy level.

Shortest wavelength is the transition with higher energy.

So,

The electron emits from \($n=5$\) to \($n=1$\) level.

The lowest state is:

\(n_1=1$\\\mathrm{n}_2=5$$\)

The Balmer-Rydberg equation is

\($$\begin{aligned}& \frac{1}{\lambda}=R_{\infty}\left[\frac{1}{n_1^2}-\frac{1}{n_2^2}\right] \\& \mathrm{n}_2=5 \text { and } \mathrm{n}_1=1 \\& \mathrm{R}=1.097 \times 10^7 \mathrm{~m}^{-1}\end{aligned}$$\)

\(\frac{1}{\lambda}=R_{\infty}\left[\frac{1}{n_1^2}-\frac{1}{n_2^2}\right]$\\\\$\Rightarrow \frac{1}{\lambda}=1.097 \times 10^7 \mathrm{~m}^{-1}\left[\frac{1}{1^2}-\frac{1}{5^2}\right]$\\\\$\Rightarrow \frac{1}{\lambda}=1.097 \times 10^7 \mathrm{~m}^{-1} \times 0.96=10531200 \mathrm{~m}^{-1}$$\lambda\\\\=\frac{1}{10531200 \mathrm{~m}^{-1}}\\\\=9.50 \times 10^{-8} \mathrm{~m}$$\lambda\\\\=95.0 \times 10^{-9} \mathrm{~m}\\\\=\mathbf{9 5 . 0} \mathbf{n m}$\)

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What is the shortest wavelength of light that can be emitted by a hydrogen atom, if the electron is initially in the n=5 level? Give your answer accurate to three significant figures.

Deprotonation of phenol by NaOHPhenol is a weak acid with a pKa value of 10, so it is not very acidic but it can be deprotonated with a strong base like sodium hydroxide (NaOH). The mechanism for this reaction is a simple acid-base reaction where NaOH acts as a base and removes the proton (H+) from phenol.

The curved arrow mechanism is shown below:Here, the Na+ ion comes in and removes the H+ ion from the O-H bond in phenol and forms water as a by-product. The major organic product is phenoxide ion (C6H5O−) which is formed after the deprotonation reaction.SN2 reaction of phenoxide with chloroethane Phenoxide ion is a good nucleophile because it has a negative charge on the oxygen atom which is able to attack the positively charged carbon atom in chloroethane. The mechanism for this reaction is a nucleophilic substitution (SN2) reaction where the phenoxide ion acts as a nucleophile and replaces the chloride ion in chloroethane. The curved arrow mechanism is shown below:Here, the phenoxide ion attacks the carbon atom in chloroethane, and the chloride ion leaves as a leaving group. The major organic product is ethyl phenyl ether (C6H5OC2H5) which is formed after the SN2 reaction.

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Answer:

The larger the highest energy level, the larger the atomic radius.

Explanation:

This part is just telling you what they mean by hallowed be Your name is

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The value of "n" in the hydrate formula CuSO4 * nH2O is 5.

To determine the value of "n," we need to calculate the molar ratio between the released water and the hydrate copper(II) sulfate.

First, we need to convert the mass of water released to moles. The molar mass of water (H2O) is approximately 18.015 g/mol. Therefore, 5.051 g of water is equal to 5.051 g / 18.015 g/mol ≈ 0.2804 mol.

Next, we calculate the molar ratio between water and copper(II) sulfate. The molar mass of copper(II) sulfate (CuSO4) is approximately 159.609 g/mol. From the balanced chemical equation, we know that one mole of copper(II) sulfate is associated with "n" moles of water.

Assuming that the molar ratio is 1:1 between CuSO4 and H2O, we can set up the following equation:

0.2804 mol H2O = 14.00 g CuSO4 * (1 mol H2O / (159.609 g CuSO4 * n))

By rearranging the equation, we can solve for "n":

n = 14.00 g CuSO4 / (159.609 g CuSO4/mol) = 0.0877 mol

Since "n" represents the number of water molecules, it must be a whole number. Therefore, the closest whole number to 0.0877 is 5.

Therefore, the value of "n" in the hydrate formula CuSO4 * nH2O is 5.

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Answer:

Calculate the number of moles you have by taking the Mass / molar mass. if you have 1000 grams ; then 1,000 g / 151.001 g/mol = X g moles. Then multiply by Avogadros # = 6.022140857 × 10^23 molecules per g mole. The result is the # of molecules of MnSO4

Explanation: Hope this helps

Answer: B. Shared electrons

Explanation: Electrons are shared in covalent bonds. The other options are all properties of metallic bonds.

Answer:

C. 22 grams because mass cannot be created or destroyed

Explanation:

In this reaction and in any chemical reaction, mass is expected to always be conserved.

According to the law of conservation of matter "in a chemical reaction, matter is neither created nor destroyed but can be changed from one form to another".

The number of moles of chlorine in a 67.2 liter sample at STP (Standard Temperature and Pressure), is approximately 3 moles.

We need to use the ideal gas law and the molar volume of a gas at STP.

STP conditions are defined as a temperature of 273.15 Kelvin (0 degrees Celsius) and a pressure of 1 atmosphere (1 atm).

The molar volume of a gas at STP is approximately 22.4 liters/mol.

Given:

Volume of the sample = 67.2 liters

We can use the formula:

n = V / Vm

where:

n = number of moles

V = volume of the sample

Vm = molar volume at STP (22.4 liters/mol)

Now, let's calculate the number of moles:

n = 67.2 L / 22.4 L/mol

n ≈ 3 moles

Therefore, there are approximately 3 moles of chlorine in a 67.2 liter sample of chlorine at STP.

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−4000⋅kJ is  heat would be released by its complete combustion.

What is Combustion?

Combustion, a chemical reaction among materials, generally which include oxygen and usually observed by way of the era of heat and light in the form of flame. The charge or velocity at which the reactants combine is excessive, in element because of the character of the chemical response itself and in element due to the fact greater power is generated than can get away into the surrounding medium, with the result that the temperature of the reactants is raised to boost up the reaction even more.

A familiar example of a combustion reaction is a lighted suit. When a in shape is struck, friction heats the head to a temperature at which the chemical substances react and generate extra warmness than can get away into the air, and that they burn with a flame. If a wind blows away the warmth or the chemicals are wet and friction does now not improve the temperature sufficiently, the in shape is going out.

Moles of acetone= 176⋅L×0.788⋅gmL−158.08⋅g⋅mol−1

                             =2.39⋅mol

−4000⋅kJ is  heat would be released by its complete combustion.

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Answer:

Heterogeneous mixture

Explanation:

A heterogeneous mixture is a mixture of two or more chemical substances (elements or compounds), where the different components can be visually distinguished and easily separated by physical means. Examples include: mixtures of sand and water. mixtures of sand and iron filings.