the distribution of electrons in atomic orbital is called

Explanation:

Z is the atomic number, which tells you the number of protons in the element and also its identity. A is the mass number, which tells you the number of protons plus the number of neutrons. X is the chemical symbol of the element, and it must correspond to the atomic number.

There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore, A is 64, Z is 28 and X is Ni.

Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle.

The balanced equation for the beta decay of ⁶⁴₂₉Cu.

⁶⁴₂₉Cu \(\rightarrow\)   ₂₈⁶⁴Ni     +   ⁰₋₁e

The atomic number, Z, refers to the number of protons inside the element as well as its identity. A refers to the mass number, that signifies the number is protons plus neutrons. The element's chemical symbol is X.

Therefore, A is 64, Z is 28 and X is Ni.

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Answer:

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Answer:

The force must be in the same direction as the object’s motion

Explanation:

Force is a physical quantity.

It is defined as the force applied to a body to move it in the direction of the force applied.

  Force  = mass x acceleration.

So, option is C is the correct choice.

Answer:

O2+H2 → H2O

become→zero to−2

∵ it will be reduced and oxidation state of H

2

becomes zero to +1 it will be oxidised.

∴ reaction will be redox

Explanation:

please mark me as brainalist

Answer:

To calculate the mass of the sample, we can use the formula:

mass = density x volume

Given that the density of pure silicon is 2.34 g/cm^3 and the volume is 450 mL, we can plug in these values:

mass = 2.34 g/cm^3 x 450 mL

Before we can multiply, we need to convert mL to cm^3 since the units need to match:

1 mL = 1 cm^3

So:

mass = 2.34 g/cm^3 x 450 cm^3

Now we can multiply:

mass = 1053 g

Therefore, the mass of the sample of pure silicon is 1.053 x 10^3 g, or 1.053 kg, with three significant figures.

Explanation:

1A.matter can neither be created nor be destroyed

6.balencing equation steps:--

balencing other than hydrogen nd oxygen

balencing oxygen

balencing hydrogen

balencing charge

The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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Answer:

5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur

Explanation:

The balanced equation in this question is

Iron + Sulfur = Iron(II) Sulfide

Fe (II) + S --> Fe(II)S

Thus one mole of sulfur reacts with one mole of Fe(II)

Hence, 5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur

The concentration of the chloride ion is obtained as 0.20 mol/L.

We have to note that the concentration of the solution has to with the amount of the solute that we have in the system. In this case, we can see that we have the Iron (III) chloride (FeCl3) which completely dissociates when dissolved in water.

Now we are told that the concentration of the solute is 0.60 mol/L solution of Iron (III) chloride but each FeCl3 molecule produces three Cl- ions, the concentration of Cl- ions in the solution will be three times the concentration of FeCl3.

Hence;

Concentration of the chloride ion is;

0.60 mol/L/3

= 0.20 mol/L

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Nitric acid is a highly corrosive and toxic substance that poses several safety hazards. Some of the main safety hazards associated with nitric acid are Corrosive, Toxic, Fire hazard, Potentially explosive mixtures.

Nitric acid is highly corrosive and can cause severe burns upon contact with skin or eyes. It can also corrode metals, plastics, and other materials.

Nitric acid is a strong oxidizer that can react violently with other chemicals, including organic compounds, and can release toxic fumes when heated or exposed to other substances.

Nitric acid is a strong oxidizing agent and can react with combustible materials, such as paper, wood, and cloth, potentially causing fire or explosion.

Nitric acid can form potentially explosive mixtures when mixed with certain other chemicals, such as ethanol.

To minimize the risks associated with using nitric acid, it is important to handle it with care and wear appropriate personal protective equipment (PPE), such as gloves, goggles, and a lab coat. It is also important to store nitric acid in a well-ventilated area, away from heat sources and combustible materials. Additionally, when using nitric acid in situ, it is important to ensure that the reagents used to form it are handled and stored properly.

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Answer:

the third one

Explanation:

When you breathe in, you inhale oxygen and exhale carbon dioxide

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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Your friend is studying a specific exergonic reaction. Your friend hypothesizes that the addition of enzyme X will reduce the delta-G of this reaction, thus allowing it to proceed spontaneously.

Enzymes do not change delta-G, so this hypothesis does not fit with what is known about this reaction.

According to the second law of thermodynamics any reaction that occurs at constant temperature without input of electrical energy or photons is exergonic. An example is cellular respiration. An exergonic reaction is a chemical reaction in which the change in free energy is negative (there is a net loss of free energy). It shows a spontaneous reaction if the system is closed and the initial and final temperatures are the same. For processes that take place in a closed system at constant pressure and temperature, the Gibbs free energy is used, while the Helmholtz energy is relevant for processes that take place at constant temperature and volume.

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Your friend is studying a specific exergonic reaction. your friend hypothesizes that the addition of enzyme x will reduce the delta-g of this reaction, thus allowing it to proceed spontaneously. The hypothesis does not fit with what is known about this reaction because Enzymes do not change delta-G.

1) An exergonic reaction is a reaction that produces free energy. Because it releases energy rather than consuming it, this kind of reaction can occur naturally, unhindered by outside factors.

2) Chemical processes known as exergonic reactions have a negative change in free energy. The free energy of a system is used to calculate its overall quantity of available energy; negative changes signify energy release, whilst positive changes signify energy storage.

Only the activation energy is altered by enzyme.

This concept does not make sense given what is known about the reaction because enzymes do not alter delta G.

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Answer:

it looks smaller for sure ^_^

After considering the given data we conclude the pH at equivalence for the titration of 160.0 mL of a 0.3403 M aniline \(C_6H_5NH_2\) solution with 0.0501 M \(HNO_3\) solution at 25°C is 10.47.

To evaluate the pH at equivalence for the titration of 160.0 mL of a 0.3403 M aniline \(C_6H_5NH_2\) solution with 0.0501 M \(HNO_3\) solution at 25°C, we can apply the following steps:
Placing the balanced chemical equation for the reaction between aniline and \(HNO_3\):
\(C_6H_5NH_2 + HNO_3 - - - > C_6H_5NH_3+NO_3^-\)
Evaluate the number of moles of aniline in the solution:
\(n = M * V = 0.3403 mol/L * 0.1600 L = 0.05445 mol\)
Find the number of moles of \(HNO_3\) required to reach equivalence:
\(n(HNO_3) = n(aniline) = 0.05445 mol\)
Calculate the volume of \(HNO_3\) required to reach equivalence:
\(V(HNO_3) = n(HNO_3) / M(HNO_3) = 0.05445 mol / 0.0501 mol/L = 1.086 L\)
Calculate the total volume of the solution at equivalence:
\(V(total) = V(aniline) + V(HNO_3) = 0.1600 L + 1.086 L = 1.246 L\)
Calculate the concentration of the salt formed at equivalence:
\(M(salt) = n(salt) / V(total) = n(aniline) / V(total) = 0.05445 mol / 1.246 L = 0.0437 M\)
Calculate the \(pOH\) at equivalence:
\(pOH = pKb + log([salt] / [base]) = 4.87 + log(0.0437 / 0.3403) = 3.53\)
Calculate the pH at equivalence:
\(pH = 14 - pOH = 14 - 3.53 = 10.47\)
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The new (final) volume of the sample of gas is equal to 0.1922 \(cm^3\).

Given the following data:

To determine the new (final) volume of the sample of gas, we would apply Boyle's law:

Mathematically, Boyle's law is given by the formula;

\(PV = k\\\\P_1V_1 = P_2V_2\)

Where;

Making \(V_2\) the subject of formula, we have:

\(V_2 =\frac{P_1V_1}{P_2}\)

Substituting the given parameters into the formula, we have;

\(V_2 = \frac{47.8 \times 3}{746} \\\\V_2 = \frac{143.4}{746}\)

New volume = 0.1922 \(cm^3\)

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The volume of the sugar solution in the beaker is 0.5 liters.

The question at hand involves finding the volume of a sugar solution that has a concentration of 4 grams per liter when the total amount of sugar in the beaker is 2 grams.

Here is the solution:Let V be the volume of the sugar solution in the beaker. The concentration of sugar is 4 grams/liter. Thus, the total amount of sugar in V liters of the sugar solution is 4V grams of sugar. The problem states that the total amount of sugar in the beaker is 2 grams.

Therefore:4V = 2V = 2/4 = 0.5 liters. Therefore, the volume of the sugar solution in the beaker is 0.5 liters.

:The volume of the sugar solution in the beaker is 0.5 liters.

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Answer:

Limiting Reagent = Aluminum

Mass formed = 28.92g (4.s.f.)

Explanation:

Step 1: Write a balanced equation for the reaction

We know that Aluminum hydride is formed from hydrogen and aluminum, so we can put those elements in our equation first:

H2 + Al -> AlH3

*Remember that hydrogen is a diatomic molecule so it is H2.

Now let's balance it! We can see that the Al molecules are balanced but the Hydrogens are not, so we can multiply both molecules by the opposite number:

3H2 + Al -> 2AlH3

Now we have 6 hydrogens on each side, we just add a 2 to balance the aluminum and we have the balanced equation!

3H2 + 2Al -> 2AlH3

Step 2: Convert all values to no. of moles

To do this, we can use the formula:

mass = no. moles x Molar mass

Which we can rearrange to find No. moles = mass/ Molar mass

Hydrogen: 3.00/2.02 = 1.49 moles

Aluminum: 26.00/26.98 = 0.9637 moles

Step 3: Find the Limiting Reagent

Now we choose one (let's use hydrogen) and divide by the co-efficient ratio between the two elements (3H2 for every 2 Al).

1.49 x 2/3 = 0.993 (This is the theoretical amount of Aluminum we need for the amount of hydrogen we have)

Now we compare this number with the actual no. moles of aluminum we have to find the limiting reagent:

0.993 > 0.9637

This means that Aluminum is the limiting reagent. (We are working with 0.9637 moles of Aluminum.)

Step 4: Find amount of product formed

We can use the molar ratio of the balanced equation again to find how much AlH3 is made. The coefficient of Al is the same as the coefficient of AlH3. This means that equal no. if moles are made in the reaction.

This means that 0.9637 moles of Aluminum Hydride is formed in this reaction.

Step 5: Convert back to mass in grams

Now we just need to convert the no. moles back to mass using the same formula:

mass = no. moles x Molar Mass

m = 0.9637 x (26.98 + 3 x 1.01)

m = 0.9637 x 30.01

m = 28.92g (4.s.f.)

Hope this helped!

Answer:

The answer is 375.54 g of AgBr

Explanation:

Mass (g) = Concentration (mol/L) x volume (L) x Molecular Weight of AgBr (g/mol)

Mass = 2M x 1L x 187.77 g/mol

Mass = 375.54g

Answer:

0.998 g/mL

Explanation:

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Answer:

Since macromolecules are generally made up of many smaller molecules and atoms, they are referred to as polymers. Polymers are made up of smaller units known as monomers. The macromolecules of life are: carbohydrates.

Explanation:

Superglue fuming is a chemical treatment that results in a white-appearing permanent fingerprint. It involves exposing a fingerprint to cyanoacrylate vapors, which react with the moisture present in the print, creating a visible white residue.

Superglue fuming is a commonly used method in forensic investigations to enhance and preserve latent fingerprints. The process involves placing an item containing the fingerprint in a sealed chamber along with a small amount of liquid superglue. The superglue releases cyanoacrylate vapors that adhere to the moisture and fatty acids present in the print, forming a durable and visible white deposit.

The white residue left by the superglue fuming process provides a contrast against the surface of the object, making the fingerprint more visible and easier to photograph or lift using various techniques. The resulting fingerprint is considered permanent because the superglue bonds with the moisture and forms a hard, solid material that can withstand handling and further processing.

Overall, superglue fuming is an effective method for developing latent fingerprints, providing investigators with valuable evidence in forensic analysis.

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Answer:

Only Student A

Explanation:

The first thing to consider in the diagrams of student A and B is to be sure that that the diagrams obey the octet rule and represent the written formula of ammonia (NH3). Clearly, only the diagram drawn by student A satisfy the these conditions.

If we look at the both diagrams closely, we will discover that the diagram drawn by student B does not satisfy the octet rule nor the trivalency of nitrogen even though it shows the lone pair of electrons on nitrogen hence it can not be the correct dot electron structure for NH3.

Answer: It is neither A or B

Explanation: I took the test and got this correct. Many people are saying only B, but that is wrong.

( please give brainliest :) )

Answer: 360g potassium chlorate

40g KCIO3 - 400g H2O = 360g KCIO3

Answer:

If u use math why It will give u the answer like 3x3=9

Explanation:

The greatest amount of Mg(OH)₂ that can be made with 4. 6 moles of MgSO₂ and 5. 4 moles of NH₃ is 4.6 mol.

The substance that is entirely consumed at the end of the chemical reaction is known as the limiting reagent.

2NH₃ + MgSO₄ + 2H₂0 ⇒ Mg(OH)₂ + (NH4)₂SO₄

This is a question about limiting reagents. The limiting reagent is the one that produces the fewest moles of Mg(OH)₂and determines the maximum amount of Mg(OH)₂ that can be generated. The reaction ends when it runs out.

the balanced equation, MgSO₄and Mg(OH)₂ have a mole ratio of 1:1, so 4.6 moles of MgSO₂ will result in 4.6 moles of Mg(OH)2.

NH₃ and Mg(OH)₂have a mole ratio of 2:1. Calculate the number of moles of Mg(OH)₂ created by 5.4 moles of NH₃ using the mole ratio.

5.4 mol NH₃ × 2 mol Mg(OH)₂/1 mol NH₃ = 10.8 mol Mg(OH)₂

4.6 mol The greatest amount of moles of Mg(OH)₂ are created by MgSO₂ hence the most Mg(OH)₂ that can be made in this reaction is 4.6 mol.

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Answer:  

Explanation:

Balancing Carbon atoms on the right side,

Balancing Hydrogen atoms on the right side,

Balancing Oxygen atoms on the left side,

The reactants are on the left side of the reaction:

Propane and oxygen are the reactants.

The products are on the right side of the reaction:

Carbon dioxide and water are the products.

forgive me if im incorrect or leaving things out

The molecule produced by the Citric Acid Cycle and used by the electron transport chain is NADH. The correct option is A.

The Citric Acid Cycle, also known as the Krebs cycle or the tricarboxylic acid cycle, is a central metabolic pathway occurring in the mitochondria of cells. It plays a key role in the generation of energy by oxidizing acetyl-CoA derived from carbohydrates, fats, and proteins. During this cycle, several molecules are produced, including NADH, GTP, ATP, and CO₂.

Out of the given options, NADH is the molecule produced by the Citric Acid Cycle that is utilized by the electron transport chain (ETC). NADH is an energy-rich molecule that carries high-energy electrons derived from the breakdown of glucose and other fuel molecules. It serves as a vital electron carrier, shuttling electrons to the ETC located in the inner mitochondrial membrane.

The ETC is a series of protein complexes and electron carriers that facilitate the transfer of electrons from NADH (and another electron carrier, FADH₂) to molecular oxygen (O₂). This electron transfer generates a flow of protons across the inner mitochondrial membrane, establishing an electrochemical gradient that drives ATP synthesis through oxidative phosphorylation.

In summary, NADH is produced by the Citric Acid Cycle, and it serves as a crucial electron carrier, delivering electrons to the electron transport chain for the generation of ATP in the process of oxidative phosphorylation. Option A is the correct one.

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Wavelength of (nm) of photon emitted is 438nm

Wavelength is the distance between identical points means adjacent crest in the adjacent cycles of a waveform signal propagated in space or along a wire

Here in the given data is photon emitted when electron drop at 7th orbital means n = 7 and n = 1 for hydrogen atom and redberg constant is also given = 1.097×10⁷m⁻¹

we have to find wavelength = ?

Expression of wavelength of radiation is

1/λ = R (1/n₁² - 1/n₂²)

1/λ = 109677×(1/7²- 1/1²)

1/λ =  109677×48/49

λ = 438.69cm = 43869m

λ = 438nm

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