How many grams of H2O will be produced from 65.1 grams of FeCl3 in the reaction 2 FeCl3 3 H2S ----> Fe2S3 6 H2O Molar masses: FeCl3

Answer:

H2O < NH3 < CCl4 < BCl3

Explanation:

Bond angle of a molecule or an ion can be explained by two concepts which are either by their valence shell electron pair repulsion (VSEPR) model or hybridization.

The VSEPR model  determines the total number of electron pairs surrounding the central atom of the species. All the electron pairs will orient themselves in such a way as to minimize the electrostatic repulsions between them. These repulsions hence determine the geometry of the covalent bond angles around the central atom.

Hence; as the number of lone pairs increases from zero to 2 the bond angles diminish progressively.

Hybridization is the mixing and blending of two or more pure atomic orbitals to form two or moe hybrid atomic orbitals which are identical in shape and energy. During the process of formation of these hybrid orbitals, The bonds formed i.e the sigma bond and the pi bond determines the bond angle of such compound.

From the given compounds;

H20 have a bond angle of 104.5°

NH3 have a bond angle of 107°

BCl3 have a bond angle of 120°

CCl4 have a bond angle of 109.5°

thus in an increasing order of bond angle:

H2O < NH3 < CCl4 < BCl3

Answer:

The answer is "Ammonium nitrate is the reactant of this chemical reaction".

Explanation:

The Ammonium nitrate (NH4NO3)  is an ammonium and nitrate ionic crystalline solid. In water and hygroscopic as a strong, it's also highly soluble, although it does not form hydrates.

It uses as a nutrient for generating medications as well as leaven fertilizers and explosive materials. Nitrate in ammonium is sodium bicarbonate ammonium chloride. It is incendiary, an oxidizing agent, and a fertilizer.

Answer: A) years on Earth are regular periods of three hundred sixty five days each

The criticism of the given idea is that there are  four seasons on Earth only because Earth is tilted at its axis and it goes around the sun.

A season is a division of the year based on changes in weather, ecology, and the number of daylight hours in a given region. On Earth, seasons are the result of the axial parallelism of Earth's tilted orbit around the Sun. In temperate and polar regions, the seasons are marked by changes in the intensity of sunlight that reaches the Earth's surface, variations of which may cause animals to undergo hibernation or to migrate, and plants to be dormant.

The Northern Hemisphere experiences most direct sunlight during May, June, and July, as the hemisphere faces the Sun. The same is true of the Southern Hemisphere in November, December, and January. It is Earth's axial tilt that causes the Sun to be higher in the sky during the summer months, which increases the solar flux.

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you decide to test your pillbugs' preference for an acidic environment versus a nonacidic environment. on one side of the chamber you place filter paper moistened with water. Dry filter paper is appropriate to place on the other side to test this variable.

Armadillidiidae (Pillbugs) is a family of woodlice, a terrestrial crustacean group in the order Isopoda. Unlike members of some other woodlice families, members of this family can roll into a ball, an ability they share with the outwardly similar but unrelated pill millipedes and other animals. This ability gives woodlice in this family their common names of pill bugs or roly polies.Other common names include slaters, potato bugs, and doodle bugs. Most species are native to the Mediterranean Basin, while a few species have wider European distributions. The best-known species, Armadillidium vulgare, was introduced to New England in the early 19th century and has become widespread throughout North America.

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The entropy of 1 mole of N2 molecules, considered as an ideal gas occupying a cubic volume of side 1 cm, is approximately 4:  62 J/K.

To find the entropy of 1 mole of N2 molecules, we need to use the formula for entropy:

S = R * ln(W)

Where:
S is the entropy
R is the gas constant
ln is the natural logarithm
W is the number of microstates or ways the system can be arranged

For an ideal gas, the number of microstates can be calculated using the formula:

W = (V^N) / (N!)

Where:
V is the volume
N is the number of molecules

Given that we have 1 mole of N2 molecules, which is approximately 6.022 x 10^23 molecules, and the volume of the cube is 1 cm^3, we can calculate the entropy.

First, let's convert the volume from cm^3 to m^3:

1 cm^3 = (1 x 10^-2 m)^3 = 1 x 10^-6 m^3

Now, we can substitute the values into the formula for W:

W = ((1 x 10^-6 m^3)^(6.022 x 10^23)) / (6.022 x 10^23)!

To simplify the calculation, we can use the fact that ln(W) is equivalent to ln((V^N) / (N!)) = ln(V^N) - ln(N!).

ln(W) = ln((1 x 10^-6 m^3)^(6.022 x 10^23)) - ln(6.022 x 10^23)!

ln(W) = (6.022 x 10^23) * ln(1 x 10^-6 m^3) - ln(6.022 x 10^23)!

Now, substituting the values of ln(1 x 10^-6 m^3) and ln(6.022 x 10^23) into the equation:

ln(W) = (6.022 x 10^23) * (-13.8155) - ln(6.022 x 10^23)!

Finally, we can use the value of the gas constant, R, which is approximately 8.314 J/(mol·K), to calculate the entropy:

S = R * ln(W) = (8.314 J/(mol·K)) * ((6.022 x 10^23) * (-13.8155) - ln(6.022 x 10^23)!)

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The volume of water that has the same mass as 100 cm³ of gold is 1,932 cm³.

To find the volume of water which has the same mass as 100 cm³ of gold, the volume of the water and the mass of the gold needs to be taken into consideration. A gold of 100 cm³ has a certain mass and to find the volume of water which has the same mass as the gold, the following formula can be used;

Density = Mass ÷ Volume

Density is equal to the mass of the object divided by the volume of the object. In other words, it tells us how tightly matter is packed together. By rearranging the formula, Volume can be calculated;

Volume = Mass ÷ Density

Density of gold = 19,320 kg/m³

Therefore, the mass of 100 cm³ of gold can be converted to volume of water which has the same mass as gold using the formula:

Volume = Mass of Gold ÷ Density of Water

Here, the volume of gold is 100 cm³.

1 cm³ = 0.000001 m³

Since mass of gold is not given, let's assume that the gold is of a certain mass of 19,320 kg/m³.

Hence,

Mass of Gold = 19,320 x (100 x 10^-6)

Mass of Gold = 1.932 kg/m³

Volume of Water = Mass of Gold ÷ Density of Water

The density of water is approximately equal to 1,000 kg/m³

Therefore,

Volume of Water = Mass of Gold ÷ Density of Water

Volume of Water = 1.932 ÷ 1,000

Volume of Water = 0.001932 m³

To convert 0.001932 m³ into cm³,

it can be multiplied by 1,000,000.

Hence, Volume of Water = 1,932 cm³

Therefore, the volume of water that has the same mass as 100 cm³ of gold is 1,932 cm³.

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Answer: Just in case your still stuck, The half-life of iron-59 is 44.5 days, which means that half of the original sample will decay in that amount of time. After 133.5 days, 2.76 g of iron-59 remains. To find the original mass of the sample, we need to know how many half-lives have passed.

133.5 days / 44.5 days/half-life = 3 half-lives

After three half-lives, the remaining mass is 1/8 of the original mass. Therefore,

2.76 g * 8 = 22.08 g

The original mass of the sample was 22.08 grams.

Hope this helps you now or later on :)

The density of CH₄ gas at 303 K and a pressure of 0.658 atmosphere is approximately 437.67 kg/m³.

To calculate the density of CH₄ gas at a given temperature and pressure, we can use the ideal gas law equation: PV = nRT

Where: P = Pressure, V = Volume, n = Number of moles, R = Ideal gas constant, T = Temperature.

First, we need to convert the pressure from atmospheres to Pascals, as the ideal gas constant has units of Pascals (Pa).

1 atmosphere is equivalent to 101325 Pascals.

So, the pressure is: P = 0.658 atm * 101325 Pa/atm = 68,702.85 Pa

Now, we can rearrange the ideal gas law equation to solve for density (d): d = (P * M) / (R * T)

Where: M = Molar mass of CH₄ (methane)

The molar mass of CH₄ is calculated by adding up the atomic masses of carbon (C) and four hydrogen (H) atoms:

M = (1 * 12.01 g/mol) + (4 * 1.008 g/mol) = 16.04 g/mol

R = 8.314 J/(mol*K) (ideal gas constant)

T = 303 K

Now, we can substitute the values into the density formula:

d = (68,702.85 Pa * 16.04 g/mol) / (8.314 J/(mol*K) * 303 K)

Simplifying the equation: d = (1,102,452.44 g*Pa)/(2,515.142 J)

Finally, we convert grams multiplied by Pascals to kilograms per cubic meter by using the conversion factor 1 g/(Pa*m³) = 1 kg/(m³):

d = 1,102,452.44 kg/(m³ * 2,515.142 J)

d ≈ 437.67 kg/m³

Therefore, the density of CH₄ gas at 303 K and a pressure of 0.658 atmosphere is approximately 437.67 kg/m³.

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The curved arrow can be used to show the movement of electrons.

The question is incomplete hence I will talk about the use of the curved arrow notation.

To use the curved arrow notation, Identify the bonds that will be broken and the bonds that will be formed in each step of the reaction. You can use the standard notation to show the movement of electrons, where a single-headed arrow (->) represents the movement of a single electron, and a double-headed arrow (<->) represents the movement of two electrons.

The total number of electrons involved in the reaction is conserved, and that the formal charges of the atoms remain the same before and after each step.

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Answer:

Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

hope it helps

Sulfur dioxide and nitrogen oxides can contribute to acid precipitation.

A pollutant is a chemical or biological substance which harms water, air, or land quality.

Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

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To drive the equilibrium in the reaction mixture towards the product, manipulate the reaction conditions and adjust the reaction parameter.

Adjusting reaction conditions to drive the equilibrium towards the desired product. By manipulating various factors such as temperature, pressure, concentration, and catalysts, it is possible to shift the equilibrium in a chemical reaction towards the product side. Altering these parameters can impact the forward and backward reaction rates, ultimately favoring the formation of the desired product.

For example, increasing the temperature may promote an endothermic reaction, while reducing the pressure or adjusting the concentration of reactants can help alleviate the impact of Le Chatelier's principle.

Additionally, introducing a catalyst can provide an alternative reaction pathway with lower activation energy, facilitating the production of the desired product. Understanding these principles and their application allows for strategic control over the equilibrium and the optimization of reaction conditions to maximize product yield.  

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Among the given compounds, the compound that will undergo a gas-evolving reaction in an aqueous solution is:

e) H2CO3 (carbonic acid)

Carbonic acid (H2CO3) can undergo a gas-evolving reaction in an aqueous solution through a process called decarboxylation. When carbonic acid is heated or subjected to certain conditions, it decomposes to release carbon dioxide (CO2) gas. This gas evolution can be observed as bubbles forming in the solution.

The other compounds listed, including acetic acid (CH3COOH), hydrofluoric acid (HF), hydrochloric acid (HCl), and sulfuric acid (H2SO4), do not undergo gas-evolving reactions under typical aqueous conditions. They may exhibit other chemical reactions but do not release gases as a product in water.

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EDTA (ethylenediaminetetraacetic acid) is commonly used to determine the hardness of water due to its ability to form complexes with metal ions, particularly calcium and magnesium ions.

Water hardness refers to the concentration of calcium and magnesium ions present in water. These ions can cause scaling, reduce the effectiveness of soaps, and have other negative effects. EDTA acts as a chelating agent, meaning it can bind to metal ions and form stable complexes.

In the process of determining water hardness, a known amount of EDTA solution is added to a water sample. The EDTA molecules form complexes with the calcium and magnesium ions present in the water.

The endpoint of the titration is reached when all the metal ions are complexed by the EDTA, resulting in a color change or an indicator reaching a specific endpoint.

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Answer:

dense and humid

Explanation:

all of them are right

pls give brainly i really need it PLEASE

Answer:

Didn't know the answer, sorry.

Because 5.00 mL is a small amount, the best tool he could use is a pipette.

Pipette or sometimes spelled as pipet can be used to transport liquid samples. It is made out of glass or plastic and can is usually used to transfer measured volumes of liquid from one container to another.

Before the pipette was invented, scientists used to use straws and they would suck in the samples carefully.

Hence 5.00 mL is a small amount, the best tool he could use is a pipette.

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Answer:

To find the number of moles of hydrogen produced from 10.0 moles of aluminum, you need to balance the equation for the reaction between aluminum and sulfuric acid.

Step 1: Balance the equation:

2Al + 3H2SO4 --> Al2(SO4)3+3H2

Step 2: Determine the stoichiometric ratio of moles of hydrogen produced per mole of aluminum:

From the balanced equation, 3 moles of hydrogen are produced for every 2 moles of aluminum.

Step 3: Calculate the number of moles of hydrogen produced:

If you start with 10.0 moles of aluminum, then the number of moles of hydrogen produced would be 3 * (10.0 moles of Al / 2 moles of Al) = 15 moles of hydrogen.

The elements that are most vigorous would be (c) potassium and fluorine.

The elements that are the least vigorous would be (d) potassium and bromine

Potassium is a metal, less reactive than sodium but more reactive than lithium, and fluorine is a highly reactive nonmetal, so both elements would be considered vigorous.

Sodium is a highly reactive metal and bromine is a nonmetal, less reactive than iodine but more reactive than chlorine, so both elements would be considered vigorous but not as much as other options.

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Answer:

Meter.

Explanation:

A foot is a American standard. Inch is also. A Mile is for a American. Kilometers are the metric. That leaves only the Meter.

Product B because it has a lower energy level than Product C's transition state, which leads to Product C.

The series of reactions required to create a desired product are described by a reaction pathway. The distribution strategy for a product is determined by things like percentage yield. Atomic economics. reaction time. is a connected graph with chemical species as its nodes. If a reaction transfers material from one species to the other, an edge unites the two. An vector from reactant toward the product is depicted as the edge.

Energy, or ATP, is created by chemical reactions within our cells. All living things require energy to survive, and Adp would be a reactant that fuels a number of other chemical reactions inside cells. Cells generate energy through a process called cellular respiration.

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Answer:

The correct option is D) Humidity levels will rise

Explanation:

A rise in humidity means that it is most likely there is going to be a rain.

When blue semi-circle lines with triangles approach red semi-circle lines it is a situation where cold front is approaching a warm front.

The resultant effect is that the warm and cold air both come to a standstill. This will most likely trigger cloud and fog and may even lead to rain.

Cheers

Answer:

The answer is B. Compressions and rarefactions.

Explanation:

To determine how the density of the urine sample compares to the normal range, we need to calculate the density of the urine sample and compare it to the normal range.

What is Density?

Density is a physical property that describes the amount of mass present in a given volume of a substance. It is a measure of how tightly packed the particles in a substance are. The SI unit of density is kilograms per cubic meter (kg/m^3), but it is also commonly expressed in grams per cubic centimeter (g/cm^3) or other units, depending on the substance being measured.

Density = mass/volume

In this case, the mass of the urine sample is 26.875 g and the volume is 25.00 ml.

Density = 26.875 g / 25.00 ml

Density = 1.075 g/ml

The density of the urine sample is higher than the normal range, which is between 1.003 and 1.030 g/ml. This could indicate various medical conditions such as dehydration, renal failure, or a urinary tract infection. Further medical testing and evaluation would be needed to determine the underlying cause of the high density.

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This is the nucleophile attack shown here is absolute the enolate ion attack carbonyl group.

a substance that reacts to create a new covalent bond by supplying two electrons (i.e. a Lewis base).

A base, or a Bronsted-Lowry base, is a nucleophile that shares an electron pair with a proton.

As a nucleophile in an SN2 reaction, the hydrogen ion. The target molecule's electrophilic carbon atom is the nucleophile's point of attack. The attraction of electrons to the oxygen atoms causes the electrophilic carbon atom to become relatively electron-deficient.

The carbonyl carbon thus becomes extremely vulnerable to a nucleophilic assault.

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Carbon dioxide molecules can absorb and emit infrared radiation, and they are one of the most abundant constituents of Earth's atmosphere.

Thus, the correct options are:d) Are one of the most abundant constituents of Earth's atmospheree) Can move in many ways, thus absorbing and emitting infrared radiation

Carbon dioxide is a trace gas present in the Earth's atmosphere. It's a vital component of Earth's carbon cycle, which helps to regulate Earth's temperature and support life as we know it. Carbon dioxide molecules are one of the most common gases in the atmosphere, accounting for around 0.04% of the Earth's atmosphere.

The greenhouse effect is caused by carbon dioxide, methane, and other greenhouse gases. When the Sun's energy reaches the Earth's surface, it is absorbed and then radiated back into space as infrared radiation. Greenhouse gases absorb this radiation and trap it in the atmosphere, which causes the Earth's temperature to rise and the climate to change.

Carbon dioxide molecules are capable of absorbing and emitting infrared radiation due to their molecular structure, which consists of one carbon atom and two oxygen atoms. This property of carbon dioxide is the main reason it's classified as a greenhouse gas.

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Pure elements has Gibbs free energy equal to 0.

The Gibbs free energy is a concept in chemistry specially of thermodynamics. The maximum amount of work that can be accomplished at a constant temperature and pressure by a closed system can be calculated using the Gibbs free energy (also known as Gibbs energy; symbol: denoted as delta G). Additionally, it offers a prerequisite for any processes like chemical reactions that might take place in such circumstances.

When a system achieves equilibrium without being pushed by an input electrolytic voltage, the Gibbs energy is the thermodynamic potential that is reduced. At the equilibrium point, its derivative w.r.t. the system's reaction coordinate vanishes.

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Answer:

third zone

Explanation:

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The earth is found in a region of space called the goldilocks zone

The goldilocks zone is the portion around a star where it is not too hot and not too cold for liquid water to exist on the surface of surrounding planet.

It is the habitable zone where living things exist too

The Earth is one the planets.

A planet is a celestial body moving in an elliptical orbit round a star.

There are 9 planets known. They are as follows:

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Answer:

Big bang theory

Explanation:

Our universe began with an explosion of space itself - the Big Bang. Starting from extremely high density and temperature, space expanded, the universe cooled, and the simplest elements formed. Gravity gradually drew matter together to form the first stars and the first galaxies.

Answer:

The Big Bang

Explanation:

The Big Bang was the moment 13.8 billion years ago when the universe began as a tiny, dense, fireball that exploded. Most astronomers use the Big Bang theory to explain how the universe began.