When 0.440 mol of aluminum are allowed to react with an excess of chlorine gas, cl2, how many moles of aluminum chloride are produced? when 0.440 mol of aluminum are allowed to react with an excess of chlorine gas, cl2, how many moles of aluminum chloride are produced? 0.880 mol 0.440 mol 0.330 mol 0.220 mol 0.110 mol?

Answer:gamma radiation

Explanation:

Among the nuclear emissions including proton, beta particle, positron and gamma radiation, gamma radiation has the greatest penetrating power. It needs dense materials like lead or concrete to be shielded.

Of the nuclear emissions listed: a. proton, b. beta particle, c. gamma radiation, and d. positron, the one with the greatest penetrating power is c. gamma radiation. Unlike other particles, gamma radiation is a type of electromagnetic radiation, similar to X-rays. This means it is not a charged particle, allowing it to penetrate materials more easily.

For instance, alpha and beta particles would be blocked by a piece of paper or the surface of the human skin, but gamma rays can penetrate much deeper, requiring dense materials like lead or concrete for shielding.

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Answer is: atomic number of resulting atom is 88.
Alpha particle is nucleus of a helium-4 atom, which is made of two protons and two neutrons.
Nuclear reaction: ²³²Th → ²²⁸Ra + α (alpha particle).

Alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and transforms into an atom with an atomic number that is reduced by two and mass number that is reduced by four.

Final answer:

The molarity of a solution created by dissolving 24 g of NaCl in 475 mL of water can be calculated by converting the mass to moles, finding the solution's volume in liters, and dividing the moles by the volume. The result is approximately 0.864 M.

Explanation:

To calculate the molarity of a solution in which 24 g of NaCl is dissolved to make 475 mL of solution, follow these steps:

The half-life of a radioisotope corresponds to the length of time required for half of a sample of radioactive material to decay

Answer:

65.1

Explanation:

Three half-lives of Krypton-79, which has a half-life of 35 hours, have passed after a period of 105 hours.

The concept underlying the question is related to the half-life of a radioactive substance. The half-life is the amount of time it takes for half of the substance to decay. Therefore, in the situation described in the question, the half-life of Krypton-79 is 35 hours.

If we have a time period of 105 hours, we can find the number of half-lives that have passed by dividing the total time by the half-life. So, 105 hours divided by 35 hours per half-life equals 3.

Therefore, 3 half-lives have passed in 105 hours for Krypton-79.

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There are some exceptions to the rule that noble gases do not normally react with other elements to form compounds. Xe can combine with fluoride and oxide to form compounds.

Under standard conditions, the noble gases are all odorless, colorless, monatomic gases with very low chemical reactivity. Helium, neon, argon, krypton, xenon, and radioactive radon are the six naturally occurring noble gases.

In order of mass, the noble gases are helium, argon, krypton, xenon, and radon. Noble gases are so named because they are so magnificent that they do not react with anything in general. Because of this, they are also known as inert gases.

Noble gases, which are most commonly found as monatomic gases, have completely filled outer electron shells and thus have no desire to react with other elements, resulting in very few compounds.

Thus, There are some exceptions to the rule that noble gases do not normally react with other elements to form compounds.

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Bed load - Large boulders carried along by a river

Headwater - The beginning of a river

Suspended load - Small rocks carried along by a river

Flood plain - A strip of land next to a river that is often very fertile

(APEX Verified 2020)

Scientists have been able to insert genes from bacteria into the DNA of corn plants. This gives some species of corn additional resistance to pests.

This would breakthrough be beneficial to humans as " less chemical residue will be found in the air and water"

Deoxyribonucleic acid (DNA) is just a polymer made up of two polynucleotide chains whose coil around with each other to create a double helix which carries genetic instructions including all living things and viruses' formation, function, growth, but also reproduction.

The remnants of a chemical or even its decomposition products may remain in or on prepared produce and are referred to as chemical residues. Chemical residues could form as a result of directly processing produce with either a chemical product or as a result of chemical exposure.

Therefore, the correct answer will be option (B).

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The study of the gradual change of an organism over a period of time is called evolution.

According to the question, the forelimbs are great evidence of evolution because the forelimbs give the ancestral connection between two species.

For example - the forelimbs of the bat and the human have the same structure but different functions.

Hence, the correct answer is mentioned above.

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Answer: The correct answer is Option b.

Explanation:

Ionic compound is defined as the compound which is formed by the complete transfer of electrons from one atom to another atom. These compounds are usually formed between metals and non-metals.

Covalent compounds are defined as the compounds which are formed by the sharing of electrons between two atoms. These compounds are formed between two non-metals.

The nomenclature of covalent compound is given by:

The nomenclature of ionic compounds is given by:

For the given compounds:

(I) [tex]Li_3N[/tex]: This is an ionic compound and hence, its name is lithium nitride.

(II) [tex]H_2S[/tex]: This is a covalent compound and hence, its name is hydrogen sulfide.

(III) [tex]SO_2[/tex]: This is a covalent compound and hence, its name is sulfur dioxide.

(IV) [tex]AlF_3[/tex]: This is an ionic compound and hence, its name is aluminium fluoride.

Hence, the correct answer is Option b.

Answer is: 325.5 mL of the stock solution.

c₁(AgNO₃) = 0.675 M.

V₂(AgNO₃) = 0.879 L.
c₂(AgNO₃) = 0.250 M.
V₁(AgNO₃) = ?
c₁ - original concentration of the solution, before it gets diluted.
c₂ - final concentration of the solution, after dilution.
V₁ - volume to be diluted.
V₂ - final volume after dilution.
c₁ · V₁ = c₂ · V₂.
V₁(AgNO₃) = c₂ · V₂ ÷ c₁.
V₁(AgNO₃) = 0.250 M · 0.879 L ÷ 0.675 M.
V₁(AgNO₃) = 0.325 L · 1000 mL = 325 mL.

To make 0.879 l of 0.250 m silver nitrate from a 0.675 m stock solution, use the relationship between initial and final concentrations and volumes (M1V1 = M2V2). By substituting the given values and solving for V1, we can find the needed volume of the stock solution in liters and then convert that volume to milliliters by multiplying by 1000.

To answer this question, we need to use the formula related to molarity (M = moles/liters), which is M1V1 = M2V2. It is a relationship between the initial concentration (M1) and volume (V1) of stock solution and the final concentration (M2) and volume (V2) of dilute solution.

In this case, the student wishes to make 0.879 l (V2) of 0.250 m (M2) silver nitrate by diluting a stock solution of 0.675 m (M1) silver nitrate. Substituting these values into the formula M1V1 = M2V2, we can find the volume of the stock solution needed (V1).

So, the calculation would be: (0.675 M) V1 = (0.250 M)(0.879 L).

To solve for V1, divide both sides by 0.675 M and the result is: V1 = (0.250 M)(0.879 L) / 0.675 M. This gives the volume of the stock solution you need to use in liters. To convert this to milliliters (since the question asked for the volume in milliliters), multiply by 1000.

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Final answer:

The number of moles in 11.82 g of gold is calculated by dividing the mass of the gold by its molar mass. The atomic weight of gold is approximately 197 g/mol, so the calculation is 11.82 g divided by 197 g/mol.

Explanation:

The calculation of the number of moles in a given mass of a substance is a fundamental concept in chemistry. The number of moles (n) can be determined using the formula:

n = mass (g) / molar mass (g/mol)

For gold (Au), the atomic weight is approximately 197 g/mol, which is its molar mass. Therefore, to find the number of moles in 11.82 g of gold, you divide the mass of the gold by the molar mass of gold as follows:

n = 11.82 g / 197 g/mol

This calculation will give you the number of moles of gold in the sample. The density of gold and Avogadro's number are not directly needed for this calculation, but they are commonly referenced when discussing the properties of elements and the mole concept.

Natural gas is primarily composed of methane, which is a colorless, odorless, and highly flammable hydrocarbon produced through the natural decomposition of organic materials.

Natural gas is primarily composed of methane. Methane, abbreviated as CH4 or carbon tetrahydrate, is a hydrocarbon that is a main component of natural gas. The natural process of decomposition of organic materials in the lack of oxygen forms methane. This gas is colorless, odorless, and highly flammable. Ensuring safety for use in homes, a rotten egg-like smell is often added to it.

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Answer: When an electron jumps from one state to another, the electron must gain or lose just the right amount of energy to actually travel the distance between the orbits.

Explanation:

Bohr in his structure of atom explained that protons which are positively charged particles and neutrons which are neutral particles,  are contained in the center of an atom called as nucleus.

The electrons which are negatively charged particles revolve around the nucleus in fixed orbit or shell or energy levels which are termed as quantized. These energy levels are stable and are stationary along with different energy value.  The electron remains in the state until energy is absorbed or released.

The electrons absorb energy when it moves from lower energy state to higher energy state. The electrons lose energy when it moves from higher energy state to lower energy state and thus emit radiations corresponding to the energy gap.

Thus the statement  when an electron jumps from one state to another, the electron must gain or lose just the right amount of energy to actually travel the distance between the orbits is incorrect because energy is absorbed when electron jumps from one state to another.

The energy is lost when electron falls from one state to another.

Answer: An electron in a stationary state does not emit radiation

Explanation:

I put that on usa test prep and it says correct. the other person who answered this is wrong

Answer:

False

Explanation:

You definitely won't see this nor need this but the Law of Conservation of Mass states that matter can neither be created nor destroyed in a chemical reaction.

I believe  the answer is false

Crude oil components are separated based on their boiling points using fractional distillation in a refinery.

The various components of crude oil are separated in a refinery based on differences in their boiling points. This process, known as fractional distillation, takes advantage of the fact that different compounds in crude oil have different boiling points.

In a refinery, crude oil is heated in a furnace and the vaporized oil is then passed through a tall column called a fractionating column. As the vapor rises through the column, it cools down, and the compounds with higher boiling points condense and are collected at different levels in the column.

For example, at the bottom of the column, heavy compounds like bitumen and fuel oil are collected, while lighter compounds like gasoline and kerosene are collected at higher levels. This allows the refinery to separate and collect various components of crude oil for further processing.

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