Iron (III) oxide (s) is heated in excess carbon monoxide (g) to form iron (s) and carbon dioxide (g). If the percent yield of iron was 83.0% and the actual yield was 9.87 g, how much iron (III) oxide (s) was used

The statement 'reactive oxygen intermediates and reactive nitrogen intermediates produced by phagocytic cells are effective in killing invading microorganisms' is true.

Phagocytic cells are the kind of cells that consume or destroy microorganisms by producing substances that are harmful to them, according to the study of biology.

The phagocytic cells produce oxygen and nitrogen intermediates, and these intermediates are reactive enough to bind to the chemicals in the microbe and inhibit their function. The microorganism dies when its activities are impeded to the point where it is unable to carry out the fundamental functions of life. Thus, the above statement is accurate.

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To calculate dh8 for each of the given reactions, we need to use Hess's Law, which states that the enthalpy change of a reaction is independent of the pathway taken to reach the products.

a. To find dh8 for this reaction, we need to look up the enthalpies of formation of the reactants and products. Then, we can use the formula dh8 = sum of products - sum of reactants.

dh8 = (dhf HCHO + dhf O2) - (dhf C2H4 + dhf O3)

b. Similarly, we can use the formula dh8 = sum of products - sum of reactants to find dh8 for this reaction.

dh8 = (dhf HNO2 + dhf O2) - (dhf O3 + dhf NO)

c. To calculate dh8 for this reaction, we need to first write out the balanced chemical equation and then use the formula dh8 = sum of products - sum of reactants.

dh8 = (dhf H2SO4) - (dhf SO3 + dhf H2O)

d. Finally, we can use the formula dh8 = sum of products - sum of reactants to find dh8 for this reaction.

dh8 = (dhf HNO2) - (2 x dhf NO + dhf O2)

Note that we need to use the enthalpies of formation for each compound, which can be found in a reference table.
To calculate ΔH° for each of the following reactions occurring in the atmosphere:

a. C2H4(g) + O3(g) → CH3CHO(g) + O2(g)
b. O3(g) + NO(g) → NO2(g) + O2(g)
c. SO3(g) + H2O(l) → H2SO4(aq)
d. 2NO(g) + O2(g) → 2NO2(g)

Follow these steps:

1. Determine the standard enthalpies of formation (ΔH°f) for each substance in the reaction. You can find these values in a thermodynamic data table or online.
2. Multiply the ΔH°f of each product by its stoichiometric coefficient and sum the values.
3. Multiply the ΔH°f of each reactant by its stoichiometric coefficient and sum the values.
4. Subtract the sum of reactants' ΔH°f from the sum of products' ΔH°f: ΔH° = Σ(ΔH°f products) - Σ(ΔH°f reactants).

By performing these calculations for each reaction, you will obtain the ΔH° for each reaction occurring in the atmosphere.

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\(65.47 \: g \times \frac{12 \: donuts}{25.64 \: g} = 30.64118565\)

\(i \: have \: 31 \: donuts\)

Answer:

30. 6 so 31 donuts

Explanation:

12d→ 25.64g

xd → 65.47g

SO cross multiply or 65.47g ÷ 25.64g. Which gives 2. 55g then divide by 12 to get 30.6 for X. If you want to check the answer substitute X with 31 and see if you get the 6547g

You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer, this represents conduction.

One of the three primary methods for the transfer of heat energy is conduction. Radiation and convection are the other two methods through which heat is transferred. Heat energy is transferred through the mechanism of conduction when nearby atoms or molecules collide.

In liquids and solids where particles are more closely spaced, conduction happens more easily than in gases, wherein particles are more widely spaced. When there is a significant temperature differential between both the substances that are in contact, the rate of energy transfer through conduction is increased.  You are stirring a bowl of hot soup with a metal spoon. The spoon starts to feel warmer, this represents conduction.

Therefore, the correct option is option A.

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Water exhibits polarity and oil does not. The correct option is A.

This is due to the molecular structure of water, which has a partial positive charge on one end and a partial negative charge on the other. This property is known as polarity and allows water molecules to attract each other, forming hydrogen bonds. Oil, on the other hand, is made up of nonpolar molecules that do not have a charge distribution.

As a result, oil molecules are not attracted to water molecules and do not mix well. In fact, they tend to form separate layers, with the oil floating on top of the water. This is why the old cliché "oil and water don't mix" is true.

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The solubility curve curve shows the way that solubility is plotted against temperature

The question is incomplete but it has to do with the preparation of the solubility curve so I will talk about it.

To prepare the solubility curve, Plot the solubility of the solute in the solvent as a function of temperature. Typically, the solubility is plotted on the y-axis, and the temperature is plotted on the x-axis.  Connect the points on the graph with a smooth curve to represent the solubility curve.

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The level of water in the graduated cylinder is 12.5 cm higher than the level of the water exposed to the atmosphere,  The total pressure of gases inside the graduated cylinder is 614 mmHg

given that :

The atmospheric pressure is 739 mmHg

The level of water in graduated cylinder = 12.5 cm = 125 mmHg

the expression for the pressure is given as :

P total = P atm - hρg

where , hρg = 125 mmHg

P atm = 739 mmHg

putting the values , we get :

P total = P atm - hρg

           = 739 mmHg - 125 mmHg

           = 614 mmHg

Thus, the total pressure inside the graduated cylinder is 614 mmHg.

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Polymers are large molecules made up of many smaller molecules, known as monomers, linked together in a chain. The intermolecular forces between the molecules in a polymer can have a significant impact on its properties. The most commonly encountered intermolecular forces in polymers are London dispersion forces, dipole-dipole interactions, and hydrogen bonding.

London dispersion forces are the weakest of the three, but are still important for many polymers. Dipole-dipole interactions occur when the partial charges of the molecules line up and create a dipole. Hydrogen bonding occurs when hydrogen atoms form a strong bond with another atom, usually oxygen, nitrogen, or fluorine. These forces are responsible for the strength and flexibility of the polymer and play a role in how the polymer behaves in different situations.

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The answers to the given problem are monthly energy use of household in m3 of natural gas equivalent = 787.5 m³, Monthly energy use of household in kg of oil equivalent = 0.29484627 ktoe, CO2 footprint of household in kg = 1500 kgCO2 (1.5 metric tonnes of CO2).

1) Calculation of monthly energy use in m3 of natural gas equivalent:For every 1 kWh of electricity produced, the gas turbines consume 0.21 m³ of natural gas equivalent.

The consumption of natural gas equivalent can be calculated by multiplying the monthly average electric energy consumption by the quantity of natural gas equivalent that is consumed by gas turbines for every 1 kWh of electricity produced.

So, the monthly consumption of natural gas equivalent will be,

3750 kWh * 0.21 m³/kWh = 787.5 m³ of natural gas equivalent

Calculation of monthly energy use in kg of oil equivalent:

Assuming that natural gas has a calorific value of 55.5 MJ/m³, and that the conversion efficiency of natural gas turbine is 33%, the equivalent energy that will be produced from 1 m³ of natural gas is 55.5 x 0.33 = 18.315 MJ/m³.

In order to calculate the equivalent energy that will be produced from 787.5 m³ of natural gas, we can use the formula:

Equivalent energy = calorific value of natural gas x volume of natural gas x conversion efficiency

So, the equivalent energy that will be produced from 787.5 m³ of natural gas is,

Equivalent energy = 55.5 x 787.5 x 0.33

= 12337.3125 MJ

= 12.337 GJ

So, the monthly consumption of oil equivalent will be:

12.337 GJ / 41.868 = 0.29484627 ktoe (kilo tonnes of oil equivalent)

2) Calculation of CO2 footprint in kg:

Assuming the average CO2 emissions coefficient for gas fired power plants is 400 g/kWh.

The CO2 footprint in kg can be calculated by multiplying the monthly average electric energy consumption by the CO2 emissions coefficient of gas-fired power plants.

So, the CO2 footprint in kg will be:

3750 kWh x 0.4 kg/kWh = 1500 kgCO2 (i.e., 1.5 metric tonnes of CO2).

Therefore, the answers to the given problem are:

Monthly energy use of household in m3 of natural gas equivalent = 787.5 m³

Monthly energy use of household in kg of oil equivalent = 0.29484627 ktoe

CO2 footprint of household in kg = 1500 kgCO2 (1.5 metric tonnes of CO2).

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Answer:

The atoms are vibrating in place.

Explanation:

One of the properties of an ionic substance is the possession of a crystalline structure. As Gerry observed the salt under a microscope, he discovered that it has a crystalline structure. Crystalline salts are all ionic in nature, hence the salt observed by Gerry is an ionic salt.

Solids containing a definite crystalline structure always has their particles vibrating in place. This is immediately evident as Gerry looks at the salt through a microscope.

Answer:

D.The atoms are vibrating in place

Explanation:

Answer:

d. oxygen is a pure substance and rocks are mixtures

Answer:

A rock is a mixture and oxygen is a pure substance

Explanation:

Oxygen is just O O O O O O and rocks have many things in it like minerals, fossils and rock stuff. I'm not a geologist

The difficult issue of whether or not the United States needs more nuclear power facilities depends on a number of variables, including energy consumption, environmental concerns, and economic feasibility.

On the one hand, nuclear power can aid in lowering greenhouse gas emissions and battling climate change because it is a dependable and low-carbon source of electricity.

Nuclear power facilities can run continuously for long stretches of time, offering a reliable source of electricity, and they don't emit greenhouse gases while they're in use. Nuclear energy also offers the potential to lessen reliance on fossil fuels, which are limited and greatly contribute to global warming.

Any choice to construct further nuclear power plants should ultimately be based on a thorough analysis of the risks, costs, and advantages of this technology as well as the accessibility of alternate energy sources like renewables.

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When servers break state, county, or municipal alcohol laws when serving alcohol, the server could be fined and the establishment could lose its liquor license.

This is defined as governmentally issued permit for the service of alcohol in an area over a period of time.

When alcohol law is broken, there may be a fine or the revoking of the liquor license.

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A mineral is a naturally occurring inorganic solid element or compound. It can have different properties that depend on its chemical composition and crystal structure.

A mineral can be classified as either extrusive or intrusive and may consist of interlocking or bonded grains of matter. Sand grains that are cemented together to form rocks are not considered minerals. A mineral is a naturally occurring inorganic solid element or compound. It can have different properties that depend on its chemical composition and crystal structure. A mineral can be classified as either extrusive or intrusive and may consist of interlocking or bonded grains of matter. Extrusive minerals are formed on the earth's surface from molten lava that has cooled and solidified. Extrusive minerals have a fine-grained texture because they cool quickly on the surface. Intrusive minerals are formed beneath the earth's surface from molten magma that has cooled and solidified. Intrusive minerals have a coarse-grained texture because they cool slowly beneath the surface. The interlocking or bonded grains of matter in a mineral are called crystals. The crystals in a mineral are arranged in a repeating pattern that gives the mineral its characteristic shape and structure. The properties of a mineral, such as color, luster, and hardness, depend on the chemical composition and crystal structure of the mineral. Minerals are important in our daily lives and are used in many industries such as construction, electronics, and jewelry making. For example, quartz is used in electronics because of its piezoelectric properties, which allow it to convert electrical energy into mechanical energy. Calcite is used in construction because it is a common constituent of cement and concrete. Diamond, the hardest mineral, is used in jewelry making because of its brilliance and durability.

In conclusion, a mineral is a naturally occurring inorganic solid element or compound that can be classified as either extrusive or intrusive and may consist of interlocking or bonded grains of matter. The properties of a mineral depend on its chemical composition and crystal structure. Minerals are used in many industries and are important in our daily lives.

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An amine that is insoluble in water can be made to dissolve by adding it to an aqueous solution of NaOH.

Therefore, option b. NaOH is correct option.

An amine is an organic compound with the formula RNH2 or R2NH or R3N, where R is an alkyl or aryl group. Amines are a type of derivative of ammonia, with one or more hydrogen atoms replaced by organic substituents.

Amines are classified as primary, secondary, or tertiary depending on the number of substituents attached to the nitrogen atom. Furthermore, they are weak bases, with aqueous solutions having pH values greater than 7 because of the presence of the amino group. When amines dissolve in water, they can act as either Bronsted-Lowry bases or Lewis bases. However, most amines are insoluble in water.Water-soluble amines Amines, despite being basic compounds, are often insoluble in water, which is a polar solvent.

As a result, they may be made water-soluble by reacting with acids. For instance, when an amine is added to an aqueous solution of hydrochloric acid, the amine ionizes and dissolves in the acidic solution. Water-soluble salts, such as ammonium chloride, are formed. Other acid-based techniques for making amines water-soluble include reacting them with sulfonic acids and oxoacids. Amines with low molecular weight are also soluble in water because they can form hydrogen bonds with water molecules.Solubility in water may be achieved by adding an amine to an aqueous solution of NaOH, which serves as a base, neutralizing the amine and making it soluble. Water-insoluble amines are converted to water-soluble compounds when they react with NaOH.

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Answer: 0.277g of disodium tetra oxo sulphate (vi) will be dissolved in 100g of water, if the mole fraction of Na2So4 is 0.039. ✅

PLEASEEEE GIVE BRANLIEST

Explanation:

The mass of a solute dissolved in a solvent can be calculated using the formula:

mass of solute = mole fraction of solute x mass of solvent / molar mass of solute

In this case, we are trying to find the mass of disodium tetra oxo sulphate (vi) (Na2SO4) dissolved in 100g of water, with a mole fraction of 0.039.

mass of Na2SO4 = (0.039) x (100g) / (142.04 g/mol)

mass of Na2SO4 = 0.277 g

So, 0.277 g of disodium tetra oxo sulphate (vi) will be dissolved in 100g of water, if the mole fraction of Na2So4 is 0.039. ✅

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Explanation:

the balanced equation is: .........

Answer:

i agree with her/him^^^^^^^^^^^^^^^^^^^^^^

Explanation:

150000 J

Chemistry

Thermodynamics

Specific Heat Formula: q = mcΔT

Math

Pre-Algebra

Order of Operations: BPEMDAS

Step 1: Define

Identify variables

[Given] m = 225 g

[Given] c = 4.184 J/g °C

[Given] ΔT = 133 °C - -26.8 °C = 159.8 °C

[Solve] q

Step 2: Solve for q

Step 3: Check

Follow sig fig rules and round. We are given 3 sig figs.

150436 J ≈ 150000 J

Topic: AP Chemistry

Unit: Thermodynamics

Book: Pearson AP Chemistry

The smell associated with a solution of sodium thiosulfate ad hydrochloric acid is that of sulfur dioxide.

Hydrochloric acid (HCl) is commonly used for the neutralization of alkaline agents, as a bleaching agent, in food, textile, metal, and rubber industries. It is neutralized if released into the soil and it rapidly hydrolyzes when exposed to water.

Hydrochloric acid is used in toilet bowl cleaners to remove dirt and grime. It is used for cleaning mortar spills off new bricks, removing rust from metals and other surfaces, and etching floors before sealing them. This product eats cotton, rayon, and mortar and is very corrosive to metals.

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An argument about subclaim 2 about bacteria from fecal transplants and how it can help the patient's body produce immune cells that kill invading bacteria is given below:

This bacteria that is gotten from fecal transplants can help boost immunity and kill harmful and invading bacteria, they do this by filling up the space in the gut, and this helps to fight invading bacteria.

This refers to the free-living organisms that can be found in a biological cell of an organism.

Hence, we can see that an argument about subclaim 2 has been given above and is well explained.

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Considering the reaction stoichiometry, you obtain:

The balanced reaction is:

Pb²⁺(aq) + 2 KCl(aq) → PbCl₂(s) + 2 K⁺(aq)

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of each compound or ion is:

Then, by reaction stoichiometry, the following amount of mass of each compound participate in the reaction:

A sample of water was found to contain 2.6x10⁻³ mole Pb²⁺.

a) Then you can apply the following rule of three:  if by stoichiometry 2 moles of Pb²⁺ react with 149.1 grams of KCl, 2.6x10⁻³ moles of Pb²⁺ react with how much mass of KCl?

\(mass of KCl=\frac{2.6x10^{.3}moles of Pb^{2+} x149.1 grams of KCl }{2moles of Pb^{2+} }\)

mass of KCl= 0.19383 grams

Finally, 2.6x10⁻³ moles of Pb²⁺ react with 0.19383 grams of KCl.

b) Then you can apply the following rule of three:  If by stoichiometry 2 moles of Pb²⁺ produces 278.1 grams of PbCl₂, 2.6x10⁻³ moles of Pb²⁺ produces how much mass of PbCl₂?

\(mass of PbCl_{2} =\frac{2.6x10^{.3}moles of Pb^{2+} x278.1 grams of PbCl_{2} }{2moles of Pb^{2+} }\)

mass of PbCl₂= 0.36153 grams

Finally, 2.6x10⁻³ moles of Pb²⁺ produces 0.36153 grams of PbCl₂.

Learn more:  

Answer:

Explanation:

Decomposition reaction, also known as analysis or dissociation, is a type of chemical reaction in which a compound breaks down into simpler substances or elements. In this reaction, a single reactant undergoes a chemical change and produces two or more products.

The decomposition reaction can be represented by the general equation:

AB → A + B

Where AB is the reactant, and A and B are the products. The reactant AB is usually a compound, and it breaks down into its constituent elements or simpler compounds.

There are different types of decomposition reactions, including:

Thermal decomposition: It occurs when a compound is heated, resulting in its decomposition into simpler substances. For example, the thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2):

CaCO3 → CaO + CO2

Electrolytic decomposition: It takes place when an electric current is passed through an electrolyte, causing it to break down into its component ions. For instance, the electrolysis of water (H2O) leads to the decomposition into hydrogen gas (H2) and oxygen gas (O2):

2H2O → 2H2 + O2

Photochemical decomposition: It occurs when a compound undergoes decomposition due to exposure to light energy. Chlorine gas (Cl2) can decompose into chlorine atoms (Cl) under the influence of light:

Cl2 → 2Cl

These are just a few examples of decomposition reactions. They are important in various chemical processes and are used in industries, laboratory experiments, and natural phenomena. By understanding and controlling decomposition reactions, scientists can gain insights into the behavior of different compounds and develop practical applications in fields such as chemistry, materials science, and environmental science.

Answer:

Explanation:

reaction in which a compound breaks down into simpler substances or elements

Among the various levels of gene regulation, epigenetic control is considered the least reversible and the most drastic form of control.

Epigenetic modifications involve changes to the structure or chemical modifications of DNA or associated proteins that can affect gene expression without altering the underlying DNA sequence.

These modifications can be heritable and can lead to long-lasting changes in gene expression patterns. Examples of epigenetic modifications include DNA methylation and histone modifications.

Once these modifications are established, they can persist through cell divisions and potentially across generations.

Reversing or altering epigenetic modifications is more challenging and less readily achievable, making it a relatively stable and significant form of gene control.

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Answer:I’m not 100% sure but I think it’s the first answer.

Explanation:

The pressure would increase as the molecules are pushing out word more and more, leading to more space being taken and more pressure. But then again, I’m not sure. I’m just a freshman with below average grades.

Answer:

A. 20 B.40 C. Ca D. 10 E. 9 F. F

Explanation:

Answer:

A.) 20

B.) 40

C.) Ca

D.) 10

E.) 9

F.) F

Explanation:

just did it on edge 2020 & got it correct....

Answer:

The effective nuclear charge is the net positive charge experienced by valence electrons.

Explanation:

The effective nuclear charge is the net positive charge experienced by valence electrons.

It can be approximated by the equation: Zeff = Z – S

Zeff = the effective nuclear charge

Z = denotes the number of protons existing in the nucleus

S = average amount of density between the nucleus and the electron.

This has become common practice, in my opinion, since scientists need to exchange ideas.

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Answer:

Explanation:Within a group, the ionization energy decreases as the size of the atom gets larger. ... In this situation, the first electron removed is farther from the nucleus as the atomic number (number of protons) increases. Being farther away from the positive attraction makes it easier for that electron to be pulled off.