a cylinder of o2(g) used in breathing by emphysema patients has aovlume of 3.00 l at a pressure of 10.0 atm. if the temperature of the cylinder is 28.0 c, what mass of oxygen is in the cylinder

In a catalyzed chemical reaction, one function of a catalyst is to increase the number of successful reactant collisions .

catalyzed reaction are the reaction which used to accelerate the rate of the reaction. Catalyst is used to increases the speed of reaction . catalyst minimize the path of the reaction. the main function of the catalyst is to speed up the chemical reaction. the catalyst is not being consumed during the chemical reaction. catalyst is to increase the number of successful reactant collisions .

Thus, In a catalyzed chemical reaction, one function of a catalyst is to increase the number of successful reactant collisions .

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If the hydrogen atom emits red, blue-green, blue, and violet light, 4 energy levels do it have in the visible region of the spectrum. Therefore, option B is correct.

The term electromagnetic spectrum can be defined as the range of frequencies of electromagnetic radiation and their respective photon energies and wavelengths.

Therefore, the four colors red, blue-green, blue, and violet light emitted by a hydrogen atom, are of four energy levels in the visible region of the electromagnetic spectrum.

Thus, option B is correct.

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Your question is incomplete, most probably your question was

If the hydrogen atom emits red, blue-green, blue, and violet light, how many energy levels does it have in the visible region of the spectrum?

A. 3

B. 4

C. 5

D. 6

Silicon dioxide is found in sand, quartz glass, and silica gel packets found in packaging of shoes and electronics. the formula for silicon dioxide is SiO₂.

The formula for silicon dioxide is SiO₂.  silicon dioxide is called as silica. silicon dioxide is commonly found in quartz. it is transparent solid. it is used in adhesives, ceramics. it is also used in agriculture chemicals. white and whitish yellow as sand or powder. it is the main part in optical fiber.

Thus, Silicon dioxide is found in sand, quartz glass, and silica gel packets found in packaging of shoes and electronics. the formula for silicon dioxide is SiO₂.

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C2HBrClF3 and O2 have partial pressures of 84 torr and 778 torr, respectively.

Given,

C2HBrClF3 mass = 15.0 g

O2 mass is 22.6 g.

C2HBrClF3's molar mass is 197.4 g/mole.

O2's molar mass is 32 g per mole.

Raoult's Rule

Xsolvent = Psolution

P0solvent

P solution is the solution's vapour pressure.

"solvent" is the solvent's mole fraction.

P0solvent = the pure solvent's vapour pressure

Raoult's Law-

Raoult's law states that the partial vapour pressure of a solvent in a solution (or mixture) is equal to or the same as the pure solvent's vapour pressure times the mole fraction of the solvent in the solution.

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The hydronium-ion concentration of the solution containing 0.0085 M Ba(OH)₂ is 0.017M and the hydroxide-ion concentration of the solution containing 0.0085 M Ba(OH)₂ is 5.88 × 10⁻¹³ M.

Given,

Ba(OH)₂ = 5.88 × 10⁻¹³ M

Dissociation of Ba(OH)₂ is given as :

Ba(OH)₂ → Ba²⁺ + OH⁻

Balanced equation:

Ba(OH)₂ → Ba²⁺ + 2OH⁻

As 1 mole of barium hydroxide produces 2 moles of hydroxide ions, so the concentration of hydroxide ion is,

[OH⁻] = 2 × [Ba(OH)₂]

[OH⁻] = 2 × 0.0085 M

[OH⁻] = 0.017 M

The concentration of hydronium ion is as follows:

[H₃O⁺] = Kw / [OH⁻]

∴ Kw = 1.0 × 10⁻¹⁴

[H₃O⁺] = 1.0 × 10⁻¹⁴ / 0.017

⇒ [H₃O⁺] = 5.88 × 10 ⁻¹³

Hence, the hydronium-ion and the hydroxide-ion concentration of the solution containing 0.0085 M Ba(OH)₂ at 25°C are 5.88 × 10 ⁻¹³ and 0.017 M respectively.

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Answer:

attached is the answer, hope it helps!!

When a force of 200 N is exerted on an object of mass 40kg, the acceleration is 05 m/s².

We know that, F = ma ... (i)

where F ⇒ Force

m ⇒ mass

a ⇒ acceleration

Given,

F = 200 N = 200 kg ms⁻²

m = 40 kg

By putting the values of F and m from the above question into equation (i), we get:

200 kg ms⁻² = 40 kg × a

a = 200 kg ms⁻² / 40kg

a = 5 ms⁻² or 5 m/s²

Hence, when a force of 200 N is exerted on an object of mass 40kg, the acceleration is 05 m/s².

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The given question is incomplete and the complete question is

Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g) ΔΗ = -1267 kJ What is the enthalpy change to burn 38.4 g of ammonia?​

Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g) ΔΗ = -1267 kJ and the enthalpy change to burn 38.4 g of ammonia is

Ammonia means NH₃ is one of the most commonly produced industrial chemical

Here given data is

ΔΗ = -1267 kJ

And the balanced reaction is

4 NH₃(g) + 3O₂(g) → 2N₂(g) + 6H₂O(g)

We have to calculate enthalpy change to burn g of ammonia = ?

First calculate the moles corresponding to 38.4 g NH₃

The molar mass of NH₃ is 17.03 g/mol

38.4 g ×1mole/17.03 g/mol = 2.25 mol

Then calculate the enthalpy change to burn 2.25 mol of ammonia

And according to the thermochemical equation 1267 kJ are released per 4 mole of ammonia that react

2.25 mol×(-1267kJ/4 mol) = -713 kJ

Enthalpy change to burn 38.4 g of ammonia is  -713 kJ

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The covalent bonding allows atoms in group 16 of the periodic table to satisfy the octet rule is two share 2 electrons of another atom to complete 8 electrons.

According to octet rule , an atom loose , gain , or share electrons to complete their 8 valence electron and achieve stability. Covalent bond is formed when two electrons share their valence electrons to satisfy the octet rule. group 16 elements have 6 valence electrons and they need 2 electrons to complete their octet.

Thus, The covalent bonding allows atoms in group 16 of the periodic table to satisfy the octet rule is two share 2 electrons of another atom to complete 8 electrons.

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Initial main byproducts of the reaction between concentrated hydro iodic acid and benzyl isopropyl ether are isopropyl alcohol and benzyliodide.

Ethers - The word Ether has been derived from the Latin word ‘aether’ which means ‘to ignite’. They contain an ether group—an oxygen atom connected to two alkyl or aryl groups.

At room temperature and under a high-pressure ethers are usually flammable. The general formula of ether is given as R-O-R, R-O-R’, R-O-Ar or Ar-O-Ar where R represents an alkyl group and Ar represents an aryl group.

The initial stage in the hydrophilic acid cleavage of ethers will be a pre-equilibrium protonation of the ether's oxygen.

The resonance-stabilized benzyl cranium ion and isopropyl alcohol will then be produced when the powerful nucleophile iodide ion displaces isopropyl alcohol from the main group.

It is feasible for the hydroid acid and isopropyl alcohol to react further to produce the specified isopropyl iodide.

Thus, Initial main byproducts of the reaction between concentrated hydro iodic acid and benzyl isopropyl ether are isopropyl alcohol and benzyliodide.

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The continuous annual decay rate of carbon-14 is k = ln (0.5)/5730.

The 1/2-life of a radioactive isotope is the quantity of time it takes for one-1/2 of the radioactive isotope to decay. The half of-existence of a selected radioactive isotope is consistent; it's miles unaffected by using situations and is independent of the initial quantity of that isotope.

1/2-life (symbol t1⁄2) is the time required for an amount (of substance) to reduce to half of its initial price. The time period is commonly utilized in nuclear physics to explain how speedy volatile atoms undergo radioactive decay or how long strong atoms survive.

Calculation:-

The functions as an exponential decay function as

P(t)=P₀e^{kt}

given the half-life as 5730 years, that is the time taken to reduce the mass to half

P₀/2 =P₀e^{5730k}

1/2=e^{5730k}

taking the natural log,

5730k=ln (0.5)

we get the exact continuous decay rate as

k = ln (0.5)/5730

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The pH of an aqueous solution is -0.7459

Let the total volume of the solution where both the mixture of aqueous solution of sodium sulfide and sodium hydrogen sulfite are present be V

no. of moles of H+ coming from Na2S,H20 = 18 * 0.293 * V

no. of moles of H+ coming from NaHS = 0.236 * V

Final concentration of H+ will be

Cf = (18 * 0.293 * V) + (0,23 * V) / V

Cf = 5.57

pH = - log [5.57]

pH = - 0.7459

Negative pH occurs when the molarity of hydrogen ions in a strong acid is greater than 1N (normality)

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Stoichiometry is the representation of balanced chemical equation, that involves the amount or quantities of reactants and products involved in the reaction.

In a chemical equation, stoichiometry is the relation between two or more substances. Stoichiometry can be the definite proportions in which elements or compounds react with one another. The rules followed in calculating the stoichiometric relationships are based on the laws of conservation of mass and energy and the law of combining weights or volumes.

For example:

N2 (g) + 3H2(g) → 2NH3(g)

In the above reaction, Nitrogen (N2) and Hydrogen (H2) react to form Ammonia (NH3).

1 molecule + 3 molecules = 2 molecules

       There is another concept known as the stoichiometric coefficient, this gives us the number of molecules that are participating in the reaction.

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Answer:

Explanation:

1) Fe2O3 + 3 H2 -----> 2 Fe + 3 H2O Number of moles of Iron (III)oxide = 450 g / 159.69 g/mol = 2.82 mole

2) 0.0155 moles of hydrogen gas

3) oxide needed to produce 125 of oxygen is7.8 moles

4) 216.5894

5) K3PO4 and KNO3

The amount of carbon dioxide (CO2) released when burning fossil fuels is the primary factor in why fossil fuels are so destructive. The greenhouse effect and climate change are significantly impacted by the burning and release of CO2. Our planet warms because more CO2 in the atmosphere prevents sunlight from escaping back into space.

what are fossils?

A fossil is any preserved remnants, impression, or trace of any once-living organism from a previous geological epoch (from Classical Latin: fossilis, meaning "obtained by digging"). Bones, shells, exoskeletons, animal or microbe impressions in stone, items preserved in amber, hair, petrified wood, oil, coal, and DNA traces are a few examples.

The earth's natural mechanisms have controlled greenhouse gas output for millions of years. At a pretty constant rate, gases would be absorbed and released. Meanwhile, temperatures were kept at a level that allowed for the continuation of life on Earth. This is "a balancing act," according to the Environmental Protection Agency.As the Industrial Revolution got under way in the second part of the 1700s, humans began to alter the delicate balance. Since then, we have been continuously increasing the amount of greenhouse gases, particularly CO2, that are being injected into the atmosphere. These gases trap heat and cause global warming. Despite the fact that there are many greenhouse gases, some of which are more powerful than others, CO2 currently accounts for about 84 percent of all greenhouse gases produced by human activity, or about 30 billion tonnes annually.Although forestry and industrial operations also make significant contributions, the majority of this is caused by burning fossil fuels for transportation and power.

CO2 levels were at 270 parts per million before the Industrial Revolution (ppm). In 1960, CO2 concentrations were at 313 ppm.

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By activating M₂ muscarinic receptor, acetylcholine released at the heart will slow the rate of action potential generation.

Acetylcholine is the neurotransmitter used at the neuromuscular junction—in other words, it is the chemical that motor neurons of the nervous system release in order to activate muscles. This property means that drugs that affect cholinergic systems can have very dangerous effects ranging from paralysis to convulsions.

An action potential occurs when a neuron sends information down an axon, away from the cell body. Neuroscientists use other words, such as a "spike" or an "impulse" for the action potential. The action potential is an explosion of electrical activity that is created by a depolarizing current.

Acetylcholine slows the heart rate by activating the M2 muscarinic receptor (M2R) that, in turn, opens the acetylcholine-activated potassium channel (IK, ACh) to slow the firing of the sinus node.

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Iron(II) oxide ions are contain that lost 2 electron in the oxidation process and iron(III) oxide contain iron that lost 3 electron

Ferrous oxide is commonly known as iron(II) oxide contain iron that lost 2 electron in the oxidation process and so it is able to bond with other atom that have an extra 2 electron and ferric oxide is commonly known as iron(III) oxide and it contain iron that lost 3 electron and iron(II) and iron(II) oxide is the chemical compound with formula Fe₃O₄ and it occur in nature as the mineral magnetite and it is one of the number of iron oxide and the other being iron(II) oxide FeO which is rare and iron(III) oxide Fe₂O₃ which also occur naturally as the mineral hematite

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Answer: molecular equation

Explanation:

Maximum amount of ethane formed is 9.47660606 grams .

What is Chemical reaction ?

There are chemical reactions taking place all around us. Nothing could be further from the reality, despite the fact that we occasionally link chemical processes with the sterile surroundings of the test tube and the lab. A staggering, nearly incomprehensible variety of new substances and energy changes actually result from the enormous number of alterations that occur in our environment every second of every day.

Chemical reactions happen whether or not you want them to in nature, where they can be considerably less controlled than in a lab. They can also be more messier. Whether it be a forest fire that is blazing.

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The solute potential at 26 degrees Celsius of the molar concentration of a sugar solution in an open beaker has been determined to be 0.5m is -12.4 bar.

Solute potential can be calculated by using:

Ψ = -iCRT

As we know,

i = 1

C = 0.5 (mol/L).,

R = 0.0831 L·bars/mol·K

T = 299K

Ψ = - 0.5*0.0831*299 = - 12.4 bar

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The other ions are S[tex]O^{2-}_{4} }[/tex] and C[tex]O^{2-} _{3}[/tex].

Precipitation reaction:

A chemical reaction occurs in an aqueous solution where two ionic bonds combine, resulting in the formation of an insoluble salt. These insoluble salts formed in precipitation reactions are called precipitates.

The solubility rules to determine the solubility of the compound are as follows:

1. The common compounds of group 1A are soluble.

2. All the common compounds of ammonium ion and all acetates, chlorides, nitrates, bromides, iodides, and perchlorates are soluble in nature. Only the chlorides, bromides, and iodides of [tex]Ag^{+}[/tex] ,[tex]Pb^{2+}[/tex] ,[tex]Cu^{+}[/tex]  and [tex]Hg^{2+} _{2}[/tex]  are not soluble.

3. All common fluorides, except for group 2A fluorides, are soluble. Moreover, sulfates except CaSO4 ,SrSO4 ,BaSO4 ,Ag2SO4  and PbSO4 are soluble.

4. All common metal hydroxides except CaSO4,Sr(OH)2 ,Ba(OH)2  and hydroxides of group 1A and that of transition metals are insoluble in nature.

5. All carbonates and phosphates, except those formed by group 1A and ammonium ion, are insoluble.

6. All sulfides, except those formed by groups 1A, 2A, and ammonium ion are insoluble.

7. Salts that contain [tex]Cl^{-}[/tex] ,[tex]Br^{-}[/tex]  or[tex]I^{-}[/tex]  are usually soluble except for the halide salts of [tex]Ag^{+}[/tex],[tex]Pb^{2+}[/tex]  and ([tex]Hg^{2+} _{2}[/tex]).

8. The chlorides, bromides, and iodides of all the metals are soluble in water, except for silver, lead, and mercury (II). Mercury (II) iodide is water-insoluble. Lead halides are soluble in hot water.

9. The perchlorates of group 1A and group 2A are soluble in nature.

10. All sulfates of metals are soluble, except for lead, mercury (I), barium, and calcium sulfates.

The reaction of Ca2+ and [tex]SO^{2-} _{4}[/tex] is as follows:

[tex]Ca^{+}[/tex](aq)  +  [tex]CO^{2-} _{3}[/tex](aq) --------> CaCO3(s)

Therefore there are [tex]SO^{2-} _{4}[/tex] and [tex]CO^{2-} _{3}[/tex] that can form a precipitation.

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a)100464 J is the heat necessary to raise the temperature of 0.800kg of water from 0°C to 30°C .

b)125847.2x10³ J is the heat required to first melt and then raise the temperature of ice from 0°C to 30°C .

a)The concept of heat transfer which is a part of thermal properties of fluids that deals with melting, evaporation and sublimation is a prominent topic of discussion for physicists and chemists across the world. This particular concept is thus applied to solve the given question by the formula

Q=ms(ΔT)

m=mass of water

s=specific heat of water=4186 J/kg or 4.186 cal/g

Specific heat of water is the heat required to raise the temperature of 1kg water by 1°C.

T=change in temperature

=0.800 x 4186 J/kg x (30°C-0°C)

=100464 J

b) For melting and raising temperature;

Q=mLf + ms(Δ)T

Here,Lf is latent heat of fusion which is the heat required to convert solid into liquid i.e. 334 kJ/kg .

=0.800kg x 334 kJ/kg x (30°C-0°C)

=125847.2 x 10³ J

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A quantity that can be determined by using logarithms is a substance's pH. The base-10 logarithm can be used to calculate this. We multiply the logarithm of the hydrogen ion concentration by a negative number.

The hydrogen ion concentration of his saliva is 0.0000013 gram moles per liter.

Marco's saliva is said to have a pH of 5.9. We can solve for this number since we have an equation that determines the pH from the hydrogen ion concentration.

We must use the inverse of this logarithm to obtain the value of this variable because the pH is calculated using the logarithm with a base of 10. To do this, raise both sides by a factor of 10.

The pH of saliva typically ranges from 6.2 to 7.6, with 6.7 being the average. The mouth's pH is not below 6.3 while it is at rest. Saliva helps to keep the pH of the mouth cavity close to neutral (6.7–7.3). There are two ways that saliva helps to keep the pH balanced.

Potential Hydrogen, or pH, is an acronym that indicates how much hydrogen is present in liquids and how active the hydrogen ion is.

An acidic pH is A pH of less than 7 results in acidic saliva, which can seriously harm your smile. Your smile will likely experience acid erosion when you have acidic saliva, which can eventually cause enamel loss, tooth decay, and cavities.

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Using the automatic pipette method, the density of the liquid is 0.82 g/ml.

Density, denoted by ρ, is the property of a substance which determines whether it will sink or float. It is the ratio between the mass of the substance and its volume. It can be calculated using the formula below.

ρ = m/v

where ρ = density

m = mass

v = volume

Given that a 100-μl automatic pipette was used, then the volume of the liquid is 100 μl.

1 µL = 0.001 mL

100 µL = 0.1 mL

Plug in the values and solve for the density of the liquid.

ρ = m/v

ρ = 0.082 g / 0.1 mL

ρ = 0.82 g/ml

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The molarity of the solution is  0.264 M.

Molarity is the quantity of a substance in a certain volume of solution. Molarity is defined as the moles of a solute in line with the liters of an answer. Molarity is likewise referred to as the molar attention of a solution.

calculation:-

mass = 21 g

the molar mass of potassium phosphate = 212 g

moles = mass/ molar mass

          = 21 / 212

           = 0.099  

Volume = 375 ml =0.375 L

molarity = number of moles/volume in liter

           =   0.099 /  0.375 L

            = 0.264 M

Molar concentration is the degree of the concentration of a chemical species, especially of a solute in a solution, in terms of the amount of substance in step with the unit quantity of the answer. In chemistry, the maximum generally used unit for molarity is the number of moles per liter, having the unit image mol/L or mol/dm³ in SI unit.

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Answer:

a thing that does things

Explanation:

While gdp was once a key cyclical indicator, its usefulness has declined substantially for all of following reasons except " Requires seasonal adjustments"

What is GDP?

It is the standard measure of value added created through the production of goods and services in a country during a certain period

The usefulness of GDP has declined except for following-

Requires seasonal adjustments

Because of seasonal adjustments, firms are able to predict the economic activity in the region and adjust their inventories,investments and production process accordingly.

Seasonal adjustment ensures that remaining movements in GDP, or any other economic series, better reflect true patterns in economic activity.

Thus the correct answer from above options is

" requires seasonal adjustments"

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note: complete question is

While GDP was once a key cyclical indicator, its usefulness has declined substantially for all of the following reasons except which one? Multiple Choice

Answer:

About 94

Explanation:

(1× 5.67×10²⁵)/6.03×10²³

94.03 moles of Carbon

About 94

Sample of an element. At room temperature, it is a lightweight, brittle solid with a metallic luster. It has fair conductivity that increases with increased temperature the material is is metalloid

An element is the simplest form of matter that cannot be split into simpler substances or built from simpler substances by any ordinary chemical or physical method and element are further classified into metal, nonmetal and metalloid and metalloid are all solid at room temprature and it appear lustrous but is not malleable or ductile and it is much poorer conductor of heat than the metal and the material has properties of both metal and non metal that means the material is probably metalloid

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