Write the electron configuration of an ion of Na +1

Answer:

Spectroscopy — the study of the absorption and emission of light by atoms

Absorption spectrum — represents energy absorbed as dark bands

Atomic spectrum — represents energy emitted or absorbed

during electron jumps

Emission spectrum — represents energy emitted as colored lines

Explanation:

Spectroscopy is an analytical technique to study and analyze using spectrum. It has been the absorption and emission of other light by the atoms. The correct matches are A.1, B. 2, C.3, and D.4.

Spectroscopy is the technique used in chemistry where matter absorbs and emits radiations of a certain wavelength. The absorption spectrum is used to represent absorbed energy in the form of dark bands or lines. Thus, options A.1 and B.2 are correct.

The atomic spectrum is characterized by the black-colored bands that depict the energy absorbed and emitted by an excited atom during electron transitions. Whereas, the emission spectrum shows the colored lines that is the energy emitted when an electron transits from higher to lower energy levels. Thus, options C.3 and D.4 are correct.

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The number of C-C bonds that are expected to be shorter than the others in a molecule can vary depending on the specific compound and its structure.

The length of a C-C bond in a molecule depends on several factors, including the hybridization of the carbon atoms involved and the presence of any double or triple bonds. In general, a single bond between two carbon atoms is longer than a double or triple bond. Double bonds are shorter and stronger than single bonds, while triple bonds are even shorter and stronger than double bonds.

Therefore, in a molecule that contains multiple C-C bonds, the presence of double or triple bonds can result in some C-C bonds being shorter than others. The exact number of shorter C-C bonds will depend on the specific arrangement of atoms and bonds in the molecule. To determine the number of shorter C-C bonds in a particular compound, it is necessary to analyze its molecular structure.

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Answer:

Number of electrons = Number of protons = 30

Number of neutron = 35

Atomic number of zinc = 30

Atomic mass = 65.39g/mol

Explanation:

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Answer:

Sorry I really don't know but can you help with one of my question I posted please thanks.

Answer:

39.6 g

Explanation:

The equation of the reaction is;

2Mg(s) + O2(g) --------> 2MgO(s)

To obtain the limiting reactant;

Number of moles in 26.4 g of Mg = 26.4g/24 g/mol = 1.1 moles

If 2 moles of Mg yields 2 moles of MgO

1.1 moles of Mg yields 1.1 * 2/2 = 1.1 moles of MgO

Number of moles in 26.4 g of O2 = 26.4 g/32g/mol = 0.825 moles

If 1 mole of O2 yields 2 moles of MgO

0.825 moles of O2 yields 0.825 moles * 2/1 = 1.65 moles of MgO

Hence Mg is the limiting reactant.

Theoretical yield of MgO = 1.1 moles of MgO * 40 g/mol = 44 g

Percent yield = 90%

Percent yield = actual yield/theoretical yield * 100

Actual yield = Percent yield * theoretical yield/100

Actual yield = 90 * 44/100

Actual yield = 39.6 g

Answer:

malleable

Explanation:

The image represent in malleable property of metal.

The image possibly represents the photoelectric effect of a metal, which is when it emits electrons after being exposed to electromagnetic radiation. Metals are also characterized by physical properties such as conductivity, malleability, metallic luster, and metallic bonding.

Based on your question, the image possibly represents the photoelectric effect, a key property of metals. This phenomenon occurs when a metal surface exposed to electromagnetic waves of a certain frequency absorbs radiation and emits electrons. These emitted electrons are called photoelectrons. Metals can also exhibit free electron model behavior, where electrons freely roam within the metal structure.

Metals possess unique physical properties like conductivity, malleability, and metallic luster. Malleability refers to the metal's ability to deform without breaking, while conductivity refers to the metal's ability to transfer heat or electricity. A metallic luster gives metals their characteristic shiny appearance.

Finally, metals are also known for their metallic bonding—a unique force that holds together the atoms within a metallic solid. Metallic bonding gives rise to many useful and varied bulk properties of metals.

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nswerllo

Explanation:

Answer:

When aluminum is added to cold dilute hydrochloric acid, there is no reaction because aluminum is a highly reactive metal, but it is protected by a thin oxide layer on its surface. This oxide layer is not easily dissolved by dilute hydrochloric acid, so the aluminum does not react with the acid. In order to react with the acid, a stronger acid such as sulfuric acid or nitric acid is needed to dissolve the oxide layer. Additionally, a higher concentration of hydrochloric acid is also needed to react with aluminum.

Another possible reason is that Aluminium metal react with hydrochloric acid to produce hydrogen gas and aluminum chloride salt, but the reaction is relatively slow and requires heat to speed it up. In cold dilute hydrochloric acid, the reaction rate is too slow to observe any visible change.

Answer:

There is a leyer of aluminium that prevents nothing from happening

Explanation:

Keep in mind that this reaction will not take place as soon as you add the piece of aluminium to the hydrochloric acid solution. That happens because the piece of aluminium is protected by a layer of aluminium oxide, Al2O3 , the same layer that protects aluminium from reacting with water

Explanation:

protons and neutrons have approximately the same size, the electron is 1847th, (I think), the size of a proton

The subatomic particles which are having approximately the same mass are neutrons and protons. Thus, option c is correct.

An atom is made of subatomic particles namely neutrons, protons and electrons. The neutrons and protons are located inside the nucleus whereas, the electrons are revolving around the nucleus through circular paths definite energy.

The electrons are having negative charges and protons are of positive charge. For a neutral atom the number of electrons and protons are equal. Electrons have negligible mass.

The mass of an atom is mainly contributed by the nucleus. The mass of neutrons and protons are have approximately same mass. Therefore, option c is correct.

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That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.

4-  The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.

The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.

5-  The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.

The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.

So, Option B is correct.

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Answer:

mass number

Explanation:

Answer and Explanation: The value closest to the mass of an atom is its mass number. The mass number is the total count of the protons and neutrons in the nucleus of the...

mass number

hope that helped

In water, ionic substances dissolve quickly. This sentence outlines how water molecules are polar nature. A polar covalent molecule is water.

Due to the unequal sharing of electrons between the atoms and the molecule's (side) asymmetrical structure, a water molecule has two poles: a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole. The water molecule has a curved form, which means that the majority of the negative charge from the oxygen is on one side of the molecule and on the other atoms positive charge from hydrogen is present. As a result, the water molecule can be described as polar.

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Answer:

What are we solving?

Explanation:

Answer:

The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore they rarely react with other elements since they are already stable

Nitration is the process by which an nitro group (-NO2) is introduced to a chemical compound. Electrophile is a molecule that has a tendency to acquire electrons and hence it is attracted towards the electron-rich centers to neutralize the charge imbalance.

During the nitration of methyl benzoate, the reaction is carried out with nitronium ion (NO2+), which is highly electrophilic and attacks the aromatic ring. The nitration of methyl benzoate occurs in the presence of a mixture of concentrated sulfuric acid and concentrated nitric acid (nitrating mixture).The nitrating mixture is used to prepare the nitronium ion, NO2+. This is the electrophile which carries out the nitration of methyl benzoate.Nitronium ion is formed as follows: HNO3 + H2SO4 → NO2+ + HSO4− + H2OWhen sulfuric acid is added to nitric acid, the acid becomes protonated and undergoes an equilibrium reaction as shown below:HNO3 + H2SO4 ⇌ NO2+ + HSO4− + H2OThe product that is formed is nitronium ion, NO2+. Thus, by adding sulfuric acid, the concentration of NO2+ increases which increases the electrophilicity and leads to the formation of more electrophile. Therefore, the concentration of the nitronium ion can be increased by adding more sulfuric acid to the reaction mixture, which will make the solution more acidic, increasing the amount of nitronium ion, NO2+.

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Answer:

961.78 C

Explanation:

961.78 C is the melting point of silver

Answer:

954 C     (according to the numbers given)

Explanation:

Specific heat of silver = 235 J/(kg-K)

   25 C  = 298.15 K

4.91 / 1000  * ( K - 298.15 K)  * 235 = 1072 J

K = melting point = 1227.2   K

= 954 C

A LOAEL is defined as the lowest dose that demonstrates a significant increase in an observable adverse effect. The term LOAEL stands for "Lowest Observed Adverse Effect Level."

When testing chemicals and other substances for toxicity, the goal is to determine the concentration or dose at which adverse effects begin to appear. The LOAEL is the lowest dose at which an adverse effect is observed. This value can be used to establish a safe level of exposure to a substance.
To determine the LOAEL, a series of tests are conducted in which different doses of the substance being tested are administered to test animals. The animals are observed for any adverse effects, such as changes in behavior, weight loss, or organ damage. The lowest dose at which an adverse effect is observed is the LOAEL.
It is important to note that the LOAEL is a relative measure of toxicity. It only provides information on the dose at which an adverse effect is first observed and not on the severity of the effect. In addition, the LOAEL may vary depending on the species tested and other factors.
In summary, the LOAEL is the lowest dose at which an observable adverse effect is detected. This value is used to establish a safe level of exposure to a substance.

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The statement that is true of the solubility of a gas in a liquid is that "the solubility of the gas in the liquid usually increases as pressure increases".

The solubility of a gas in a liquid is the amount of gas that dissolves in a given volume of a liquid at a particular temperature and pressure. The solubility of a gas in a liquid is affected by changes in temperature, pressure, and the nature of the solvent and the solute. The solubility of a gas in a liquid is directly proportional to the partial pressure of the gas over the liquid.

Therefore, if the partial pressure of the gas above the liquid is increased, the solubility of the gas in the liquid also increases. If the partial pressure of the gas above the liquid is decreased, the solubility of the gas in the liquid also decreases. This phenomenon is known as Henry's law.

According to Henry's law, the solubility of a gas in a liquid is directly proportional to the pressure of the system. Therefore, as the pressure of the system increases, the solubility of the gas in the liquid decreases. Conversely, as the pressure of the system decreases, the solubility of the gas in the liquid increases.

To summarize, the solubility of a gas in a liquid usually increases as pressure increases. This is because the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas over the liquid.

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The volume of 1.5M NaOH required to neutralize the HCl solution is 0.549 liters.

Stoichiometric problem

From the balanced equation:

HCl + NaOH -> NaCl + H2O

We know that we have 30 grams of solid HCl, which we can convert to moles using its molar mass:

30 g HCl / 36.46 g/mol = 0.823 mol HCl

We also know that the HCl is dissolved in 250 mL of solution, which we can convert to liters:

250 mL / 1000 mL/L = 0.25 L

Now we can calculate the molarity of the HCl solution:

We want to neutralize the HCl solution with 1.5 M NaOH. To do this, we need to add enough NaOH to react completely with the HCl:

0.823 mol HCl x (1 mol NaOH / 1 mol HCl) = 0.823 mol NaOH

Now we can calculate the volume of 1.5 M NaOH required to react with the HCl:

Therefore, we need to add 0.549 liters of 1.5 M NaOH to the HCl solution to neutralize it.

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if 3.45 grams of magnesium are burned, 1.725 grams of magnesium oxide are produced. The chemical equation for the reaction of magnesium with oxygen is 2MgO.

Magnesium is a chemical element that is highly reactive, meaning that it easily reacts with other substances. When magnesium is burned in the presence of oxygen, it reacts with the oxygen to form magnesium oxide,

The chemical equation for the reaction of magnesium with oxygen is:

2Mg + O2 -> 2MgO

This equation tells us that for every 2 grams of magnesium that react with oxygen, 2 grams of magnesium oxide are produced. Therefore, if 3.45 grams of magnesium are burned, the number of grams of magnesium oxide produced can be calculated as:

3.45 grams Mg / 2 grams Mg/1 gram MgO = 1.725 grams MgO

Therefore, if 3.45 grams of magnesium are burned, 1.725 grams of magnesium oxide are produced.

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The answer is product.

The free energy of a thermodynamic system is referred to as the Gibbs free energy or Gibbs energy. The Gibbs free energy is a thermodynamic quantity that represents the thermodynamic system's ability to do reversible work.The formula for Gibbs energy is shown below:

                           ΔG = ΔH - TΔS

where:ΔG: the Gibbs free energy of the system

ΔH: the enthalpy of the systemT: the temperature of the system

ΔS: the entropy of the system

The Gibbs free energy can be calculated using the following formula:

ΔG° = - RT lnK

where:ΔG°: the Gibbs free energy at standard state

R: the gas constant

T: the temperature in kelvins

K: the equilibrium constant

The value of ΔG° determines the direction in which a chemical reaction will proceed. A negative ΔG° means that the reaction is spontaneous, while a positive ΔG° means that the reaction is non-spontaneous.

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If A 25-gram block of Aluminum has an initial temperature of 35 degree Celcius. The final temperature will be  57.37°C

The amount of energy needed to raise the temperature of 1 kilogram of tissue by 1 K (=1°C) is measured by the specific heat capacity of tissue, or c [J/(kg K)]. For instance, fat has a lower specific heat capacity than other soft tissues, which means that it needs less energy to raise temperature. The energy needed to increase the temperature of 1 m3 of tissue by 1 K (=1°C) can be found by multiplying specific heat capacity by mass density (c [J/(m3 K)]), which is the same as a volume-specific heat capacity.

The final temperature can be calculate as follows:

Accordingly, the amount of energy generated is equal to the system's mass times its temperature change and times its specific heat.

Q=mcΔT

where,

Q= the amount of energy generated

m = mass

c = spesific heat

ΔT= temperature change

so, ΔT= final temperature - initial temperature =(x−35) °C

Therefore,

Q=mcΔT

503.38 = 25 × 0.9 × (x - 35)°C

(x - 35) =  503.3 / 25 × 0.9

x = 57.37°C

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The compound aluminum sulfate, Al2(SO4)3, dissociates into three ions when it dissolves in water: 2 aluminum ions (Al3+) and 3 sulfate ions (SO42-).

a. To determine the concentration of Al3+ ions in a 0.10 M solution of Al2(SO4)3, we need to calculate the molar concentration of Al3+. Since Al2(SO4)3 dissociates into 2 Al3+ ions for every 1 formula unit of the compound, the concentration of Al3+ ions will be twice the concentration of the original compound:

Concentration of Al3+ = 2 x 0.10 M = 0.20 M

Therefore, the concentration of Al3+ ions in a 0.10 M solution of Al2(SO4)3 is 0.20 M.

b. To determine the concentration of SO42- ions in a 0.10 M solution of Al2(SO4)3, we also need to calculate the molar concentration of SO42-. Since Al2(SO4)3 dissociates into 3 SO42- ions for every 1 formula unit of the compound, the concentration of SO42- ions will be three times the concentration of the original compound:

Concentration of SO42- = 3 x 0.10 M = 0.30 M

Therefore, the concentration of SO42- ions in a 0.10 M solution of Al2(SO4)3 is 0.30 M.

c. The total concentration of ions in the solution can be calculated by adding together the molar concentrations of Al3+ and SO42- ions:

Total concentration of ions = Concentration of Al3+ + Concentration of SO42-

Total concentration of ions = 0.20 M + 0.30 M

The total concentration of ions = 0.50 M

Therefore, the total concentration of ions in a 0.10 M solution of Al2(SO4)3 is 0.50 M.

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About 0.25 liters of 6.0 m solutions of HCl should be added to create 2.0 liters of a 0.75 m HCl solution.

Lowering a solute's concentration in a solution is the process of dilution. It entails adding significantly additional water or solvent to the solution. When more solvent is added to a solution without extra solute, the solution gets diluted.

The dilution formula is  M₁V₁=M₂V₂. Here, M₁ is the initial molarity, M₂ is the final molarity, V₁ is the initial volume, and V₂ is the final volume.

Given, M₁ is 6.0 M, M₂ is 0.75 M, and V₂ is 2.0 L. We have to find V₁.

\(\begin{aligned}V_1&=\frac{M_2V_2}{M_1}\\&=\frac{0.75\times2}{6}\\&=\mathrm{0.25\; L}\end{aligned}\)

The answer is 0.25 L.

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The model that first showed that positive charges in an atom are centrally located in the nucleus was proposed by Ernest Rutherford.

In the gold foil experiment, Rutherford and his colleagues bombarded a thin sheet of gold foil with alpha particles. They expected the alpha particles to pass through the gold foil with slight deflections due to the assumed plum pudding model of the atom, where positive charges were thought to be evenly distributed throughout the atom.

However, to their surprise, some alpha particles were significantly deflected and even bounced back in the opposite direction. Rutherford concluded from this observation that the positive charges and most of the mass in an atom were concentrated in a tiny, dense region at the center, which he called the nucleus.

According to the Rutherford model, the nucleus contained positively charged protons, while the negatively charged electrons orbited around the nucleus, much like planets orbiting around the sun. This model explained the observed scattering pattern of the alpha particles, with the vast majority passing through the atom unaffected.

Rutherford's model revolutionized our understanding of the atom and paved the way for the development of the modern atomic theory. His work laid the foundation for subsequent models, such as the Bohr model and the quantum mechanical model, which further refined our understanding of the atomic structure.

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An equilibrium between AgCl(s) and its dissolved ions occurs when the aqueous solution is saturated.

In a saturated solution, the maximum amount of solute, in this case AgCl, has dissolved in the solvent at a given temperature, and no more solute can dissolve. This results in a dynamic equilibrium where the rate of dissolution of AgCl(s) equals the rate of precipitation of AgCl(s). The concentrations of the dissolved ions (Ag+ and Cl-) remain constant, and the solution is neither supersaturated nor unsaturated.
In an unsaturated solution, the amount of dissolved solute is less than the maximum that the solvent can dissolve. In this case, the AgCl(s) will continue to dissolve until the solution becomes saturated. On the other hand, a supersaturated solution contains more solute than the solvent can typically dissolve at a given temperature. This occurs when the solution is prepared at a higher temperature and then cooled. Supersaturated solutions are unstable and can lead to the precipitation of excess solute, eventually reaching the saturated state and establishing equilibrium between the solid AgCl and its dissolved ions.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\ \)

From the question we have

\(density = \frac{15}{14} \\ =1.0714285 ...\)

We have the final answer as

Hope this helps you

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).

Answer:

Yes

Explanation:

Due to pollution, greenhouse gasses, etc

Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down forests and farming livestock. This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming.