A 1. 00 L volume of dry air is sealed inside of a round flask and brought to a temperature of 50. 0°C in

a hot water bath. If the pressure gauge reads 3. 60 atm, how many moles of gas are in the sample of

air?

a. The balanced chemical equation for the reaction between Mg and N2 is:

3Mg(s) + N2(g) → Mg3N2(s)

From the equation, we can see that 3 moles of Mg reacts with 1 mole of N2 to produce 1 mole of Mg3N2. The molar mass of Mg is 24.31 g/mol, while the molar mass of N2 is 28.02 g/mol. To determine the mass of N2 required to react with 20 g of Mg, we can use the following calculation:

20 g Mg × (1 mol Mg/24.31 g) × (1 mol N2/3 mol Mg) × (28.02 g N2/1 mol N2) = 30.4 g N2

Therefore, 30.4 g of N2 is needed to completely react with 20 g of Mg.

b. Using the same balanced chemical equation as in part (a), we can see that 3 moles of Mg react to form 1 mole of Mg3N2. The molar mass of Mg3N2 is 100.93 g/mol. To determine the mass of Mg3N2 produced, we can use the following calculation:

20 g Mg × (1 mol Mg/24.31 g) × (1 mol Mg3N2/3 mol Mg) × (100.93 g Mg3N2/1 mol Mg3N2) = 83.4 g Mg3N2

Therefore, 83.4 g of Mg3N2 is produced from 20 g of Mg.

Answer:

Compounds containing two elements (so called binary compounds) can either have ionic or covalent bonding. If a compound is made from a metal and a non-metal, its bonding will be ionic. If a compound is made from two non-metals, its bonding will be covalent.

Explanation:

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Answer:

C. 1 cubic foot of loose sand

Explanation:

For many  objects having equal volume , surface area will be maximum

of the object which has spherical shape .

But when a sphere is broken into tiny small spheres , total surface area of all the small spheres will be more than surface area of big sphere .

Hence among the given option , surface area of loose sand will have greatest surface area . Loose sand is equivalent to small spheres .

Answer:

the answer would be C 1 cubic foot of loose sand.

65 grams of oxygen is approximately equal to 2.03125 moles.

To convert 65 grams of oxygen to moles, we need to use the molar mass of oxygen (O₂), which is approximately 32.00 g/mol. Oxygen exists as a diatomic molecule (O₂), so we use the molar mass of O₂ to convert from grams to moles.

The formula for converting grams to moles is:

Moles = Mass (in grams) / Molar mass (in grams per mole)

Given:

Mass of oxygen = 65 grams

Molar mass of oxygen (O₂) = 32.00 g/mol

Moles of oxygen = 65 grams / 32.00 g/mol

Moles of oxygen ≈ 2.03125 moles

Therefore, 65 grams of oxygen is approximately equal to 2.03125 moles.

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Answer:

2.27%

Explanation:

The observed value of the boiling point = 71.8°C

The actual value of the boiling point = 70.2°C

We need to find the percentage error of the student's measurement. The percentage error in any value is given by :

\(\%=\dfrac{\text{calculated value-actual value}}{\text{actual value}}\times 100\\\\=\dfrac{71.8-70.2}{70.2}\times 100\\\\=2.27\%\)

So, the required percentage error is 2.27%.

The gas is most likely to be Xenon. So the correct option is (a)

The rate of diffusion, is the change in the number of diffusing molecules inside the cell over time i.e. \(d_{n}\) / \(d_{t}\). As the net movement of diffusing molecules depends on the concentration gradient then the rate of diffusion is directly proportional to the concentration gradient (\(d_{C}\)/\(d_{t}\)) across the membrane.

Since,  \(\frac{1}{time}\) \(\alpha\) \(\frac{pressure}{\sqrt{molar weight} }\)

In the given question time required for 0.010 moles of SO₃ is 22 s

Time required for 1 mole of SO₃ is  \(\frac{22}{0.01}\) × 1 = 2200 s

Now,  \(\frac{1}{2200}\) \(\alpha\) \(\frac{1}{\sqrt{80} }\)

For unknown gas

\(\frac{1}{2800}\) \(\alpha\) \(\frac{1}{\sqrt{m} }\)

Now combining both the equation;

Since,

\(\frac{1}{2200}\) × 2800 = \(\frac{1}{\sqrt{80} }\) ×\(\sqrt{m}\)

m = 129.02 g/mole

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Increased concentration generally increases the reaction rate. The reaction rate depends on various factors such as concentration, surface area, temperature, pressure, and catalyst.

When the concentration of reactants is increased, it increases the probability of collisions between them, which in turn leads to an increase in the reaction rate.

Concentration is defined as the amount of solute present in the given amount of solution. If there is a greater concentration of the reactant present in a solution, then it will result in a higher rate of reaction. This is due to the fact that more number of reactant molecules will be available for the reaction, and thus the chances of their collision will increase. As a result, the rate of reaction will increase.

When the volume of a solution is increased, it leads to a decrease in the concentration of reactants, which may result in a lower reaction rate. The distance between reactant molecules does not have a significant effect on the rate of reaction because the molecules have to collide with each other to form products. Surface area and temperature also affect the reaction rate.

A higher surface area of the reactants and a higher temperature increase the chances of collisions between reactant molecules and thus lead to an increase in the reaction rate. Therefore, increased concentration generally increases the reaction rate.

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Answer:

400 kPa

Explanation:

using General Gas Law

\( \frac{100 \times 20}{100} = \frac{p \times 10}{200} \)

\(p = 400\)

The concept combined gas law is used here to determine the new pressure of the gas. The pressure of the gas obtained is 400 kPa.

The equation connecting the volume, pressure and temperature of a gas can be represented mathematically by an equation called the combined gas law. In this equation the temperature should be always in Kelvin.

The combined gas law is also defined as the ideal gas law without Avogadro's law. It is the combination of Boyle's law, Charles's law and Gay-Lussac's law. The equation is given as:

PV/T = k

Here 'P' is the pressure, 'V' is the volume, 'T' is the temperature and 'k' is a constant. The equation for two gases of different volumes and temperature is:

P₁V₁ / T₁ = P₂V₂ / T₂

Then P₂ = P₁V₁T₂ / T₁V₂

Here the new pressure P₂ is:

P₂ = 100 × 20 × 200 / 100 × 10

P₂ = 400 kPa.

Thus the new pressure is 400 kPa.

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Answer:

2.5 gallon fuel produced 21.5 kg  CO₂.

Explanation:

Given data:

CO₂ produced during burning of one gallon fuel = 8.6 kg

CO₂ produced during burning of 2.5 gallon fuel = ?

Solution:

This problem is solved through simple multiplication.

If one gallon fuel produced 8.6 kg CO₂ then 2.5 gallon produced is determined by multiplying the 2.5 with 8.6 kg.

1 gallon = 8.6 kg CO₂

2.5 ×  8.6 kg CO₂  = 21.5 kg

Thus 2.5 gallon fuel produced 21.5 kg  CO₂ .

An ionic compound is a type of chemical compound composed of positively charged ions (cations) and negatively charged ions (anions) held together by electrostatic forces. The correct answer is:

\(K_3P\) : potassium phosphide

\(AlI_3\) : aluminum iodide

\(MgO\) : magnesium oxide

Ionic compounds are formed through ionic bonding, which involves the transfer of electrons from one atom to another.

In an ionic compound, the cations and anions are attracted to each other due to their opposite charges, forming a crystal lattice structure. The cations are usually metal ions, while the anions are typically non-metal ions. The transfer of electrons creates ions with full outer electron shells, resulting in the formation of stable compounds.

Therefore, the correct answer is:

\(K_3P\) : potassium phosphide

\(AlI_3\) : aluminum iodide

\(MgO\) : magnesium oxide

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Answer:

its a

Explanation:

Answer:

c

Explanation:

At equilibrium, the ratio [NO2]/[N2O4] can be either less than, equal to, or greater than 1, depending on the specific reaction conditions.

At equilibrium, the ratio [NO2]/[N2O4] can be less than, equal to, or greater than 1, depending on the specific conditions of the reaction. The equilibrium constant (Kc) represents the ratio of the concentrations of products to reactants, in this case [NO2]^2/[N2O4].

1. If Kc > 1, then the ratio [NO2]/[N2O4] will be greater than 1, indicating that there is more NO2 than N2O4 at equilibrium.
2. If Kc = 1, then the ratio [NO2]/[N2O4] will be equal to 1, meaning that the concentrations of NO2 and N2O4 are equal at equilibrium.
3. If Kc < 1, then the ratio [NO2]/[N2O4] will be less than 1, which means there is more N2O4 than NO2 at equilibrium.

However, if the reaction is exothermic (releases heat), the equilibrium will favor the side with fewer moles of gas, which means that the ratio [NO2]/[N2O4] will be greater than 1.

The specific value of Kc depends on factors such as temperature and pressure, which can affect the position of the equilibrium.

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Answer:C. Chemical Formula

Explanation:

Lowering the flame can result in the tip overheating.

An overheating plasma system will wear out torch parts quickly and eventually may burn out the torch and leads.

What is an oxy-acetylene torch set?

A gas torch that burns a mixture of acetylene and oxygen to produce a high-temperature flame (3,000°C or 5,400°F) that can weld or cut metal.

Can an oxy-acetylene torch explode?

Thus, lowering the flame's size may result in the tip overheating.

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Answer:

Criminal justice and forensic science are two degrees often pursued by those with a sincere interest in and passion for the criminal justice system. Indeed, a degree in either of these fields can eventually lead to a career in law enforcement in a number of capacities, including crime scene analysis, crime scene investigation, or as a forensic science technician.

Beyond this, however, is where the two areas of study begin to differ. While the study of criminal justice focuses on crime, it hones in on the causes of the crime, any responses by law enforcement agencies, and prevention methods to consider and employ in the future. As such, a student pursuing a degree in criminal justice can expect to take courses on law and legal theory, law enforcement philosophies and theories, sociology and criminal behavior, and others related to criminology. A developed understanding of concepts within each of these subfields can help a student of criminal justice apply this to real-world situations, and perhaps even obtain future employment as a police officer or detective, an FBI agent, an immigration officer, or any other member of a law enforcement agency.

In contrast to this, those studying forensic science will also examine crime, yet from an entirely different perspective. This field of study focuses on the application of science and scientific methods to understand all aspects of a crime, including the perpetrator and the causes. Those studying forensic science are certain to take courses in physical sciences, such as biology and chemistry, as well as others related to DNA and fingerprint analysis, crime scene procedure, and other types of forensic analysis. Because those working in the field of forensic science routinely interact with members of law enforcement, students will also likely take courses on forensic case reporting and investigation techniques. Although there is no one career path for a student of this field, possible future options include employment as a forensic pathologist, a toxicologist, an evidence technician, or even an intelligence analyst, depending on what level of education that student pursues.

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Explanation:

Answer:

because battery have it's own voltage in it's composition

(a) Acidic oxides: CO2, NO2, Al2O3, NO, SO3

(b) Basic oxides: CaO, CO, SO3, K2O, BaO

(c) Amphoteric oxides: K2O, Al2O3, CaO, CO2, SnO2

(d) Neutral oxides: CO, NO, SnO2, N2O5, BaO

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Answer:

One atom of each element is made up of protons, neutrons, and electrons. The number of electrons determines how an element reacts. The number of protons gives the element its identity. ... They react well with nonmetals because they can easily give up electrons to form ions.

If a column was run with florenone and fluorenol instead of fluorene and fluorenone, fluorenol would elute first.

The elution order in a chromatographic column is determined by the polarity and affinity of the compounds for the stationary phase. In this case, florenone and fluorenol are the compounds of interest.

Fluorenol, which is the alcohol form of fluorene, contains a hydroxyl group (-OH) attached to the aromatic ring. This hydroxyl group increases the polarity of the molecule compared to florenone, which lacks the hydroxyl group. The presence of the hydroxyl group makes fluorenol more polar and more likely to interact with the stationary phase.

In a typical chromatographic column, the more polar compounds tend to have stronger interactions with the stationary phase, resulting in slower elution times. Therefore, fluorenol, being the more polar compound, would have a stronger interaction with the stationary phase and elute later compared to florenone.

The difference in elution order between fluorenol and florenone can also be attributed to the increased hydrogen bonding potential of fluorenol due to the presence of the hydroxyl group. Hydrogen bonding interactions can further enhance the affinity of fluorenol for the stationary phase, leading to delayed elution compared to florenone.

In summary, if a column was run with florenone and fluorenol instead of fluorene and fluorenone, fluorenol would elute first. The presence of the hydroxyl group in fluorenol increases its polarity, resulting in stronger interactions with the stationary phase and slower elution compared to florenone.

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Answer:

Protons are the atomic number and for each element they never change.

Electrons are equal to the atomic number unless it is an Ion (Positive charge means it has less negative means it has more)

Mass number is Protons+Nuetrons

Explanation:

The statement that describes a hydrogen bond is the bond between hydrogen in one water molecule and another hydrogen in a different water molecule. The correct option is b.

Hydrogen bonds are the bonds that are formed between water molecules and other molecules that join with hydrogen. These are weak bonds. This bond is formed between hydrogen atoms and other atoms.

One of the bonds that allow molecules to associate is the hydrogen bond. It happens when hydrogen forms a covalent bond with an element that is extremely electronegative, such as oxygen, nitrogen, or sulfur.

Thus, the correct option is b) the bond between hydrogen in one water molecule and another hydrogen in a different water molecule.

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Answer:

An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements. In general, the size of an atom will decrease as you move from left to the right of a certain period.

Explanation:

Answer:

Decomposition reactions require an input of some form of energy. For example, under the influence of an electric field, water breaks down to give hydrogen and oxygen. In the presence of sunlight, hydrogen peroxide decomposes into oxygen and water.

To produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta. To determine the amount of pasta required to produce 1000 kg of fishmeal, we need to consider the mass balance of the process. Let's break down the steps involved:

A. Extraction of fish oil:

The pasta obtained from the extraction stage contains 20% flour and 80% water. To calculate the amount of pasta, we need to determine the mass of flour and water in the pasta. Let's assume the total mass of the pasta is P kg.

Mass of flour = 20% of P = 0.2P kg

Mass of water = 80% of P = 0.8P kg

b. Drying of pasta:

During the drying stage, the pasta is dried in a rotary drum, resulting in fishmeal with 40% humidity. This means that the final fishmeal will contain 60% dry matter.

Let's assume the mass of the dried fishmeal is M kg.

Mass of dry matter = 60% of M = 0.6M kg

Since the dry matter in the fishmeal comes from the flour in the pasta, we can equate the mass of dry matter to the mass of flour:

0.6M kg = 0.2P kg

To produce 1000 kg of fishmeal, we want to find the corresponding value of P:

0.6M = 0.2P

P = (0.6M) / 0.2

P = 3M

Therefore, to produce 1000 kg of fishmeal (M = 1000 kg), you would need 3000 kg of pasta.

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0.0989 grams of KOH is needed to neutralize 12.6 mL of 0.14 M HCl in stomach acid.

Volume of HCl solution = 12.6 mL = 0.0126 L

The concentration of HCl solution = 0.14 M We have to find the amount of KOH required to neutralize the given volume and concentration of HCl.

In order to calculate the amount of KOH, we need to first calculate the number of moles of HCl using the formula of Molarity;

Molarity = (Number of moles of solute) / (Volume of solution in liters)0.14 M = n(HCl) / 0.0126L0.14 × 0.0126 = n(HCl)n(HCl) = 0.001764 moles of HCl

Now, the balanced chemical equation for the reaction of KOH with HCl is;KOH + HCl → KCl + H₂OOne mole of KOH reacts with one mole of HCl.

Therefore, the number of moles of KOH required to neutralize the given amount of HCl would be equal to 0.001764 moles. Now, let's calculate the amount of KOH in grams.

Molar mass of KOH = 39.1 + 16.00 + 1.008 = 56.108 g/mol0.001764 moles of KOH would weigh = 0.001764 × 56.108 = 0.0989

hence, the amount of KOH required to neutralize the given volume and concentration of HCl would be 0.0989 grams.

Thus, 0.0989 grams of KOH is needed to neutralize 12.6 mL of 0.14 M HCl in stomach acid.

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Answer:

particles in a fixed position

Just trust me.

They change the composition of matter to change the properties of matter.

There is matter all around you. All matter is made up of very small particles, including atoms and molecules. The objects you see and touch on a daily basis were constructed from those atoms. Anything that has mass and occupies space (has volume) is considered matter.

The quantity of matter in an item is its mass. A statue made of lead (Pb) or another little object with a lot of mass may be present. You might have a massive object with a small mass.

Additionally, you ought to be aware of the distinction between matter and weight. Weight is a measure of gravity's pull, whereas mass is a measure of the substance of an object.

Thus, They change the composition of matter to change the properties of matter.

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Answer:

it's a chemical Element

Explanation:

symbol He

atomic number 2.

The possible cause for a sodium hypochlorite pump not feeding the proper amount and resulting in a decrease in residual could be: Clogged feed lines, Worn or damaged pump components, Incorrectly set feed rate or Electrical or mechanical failure of the pump.

It is recommended to check and correct these issues to ensure proper operation of the sodium hypochlorite feed pump. These include clogged feed lines, worn or damaged pump components, an incorrectly set feed rate, or electrical or mechanical failure of the pump.

It is important to identify and address the underlying cause in order to ensure proper operation and reliable performance of the pump. Professional inspection and maintenance of the system may be necessary in order to resolve the issue and prevent future problems.

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The decomposition reaction of silver chloride (AgCl) when exposed to light can be represented by the following balanced equation:

2AgCl (s) → 2Ag (s) + Cl2 (g)

In this equation, solid silver chloride decomposes into silver metal (Ag) and gaseous chlorine (Cl2) when exposed to light.

This reaction is an example of a photochemical reaction, where light energy triggers a chemical change. In this case, the absorption of light energy causes the silver chloride crystal lattice to break down, resulting in the formation of silver atoms and chlorine molecules.

It's worth noting that silver chloride is a photosensitive compound commonly used in traditional black and white photography. When light strikes the silver chloride-coated film, it creates a pattern of exposed and unexposed areas. The exposed areas undergo the decomposition reaction, resulting in the formation of metallic silver, which forms the photographic image.

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