Calculate each of the following quantities:
(a) Mass (g) of 0.346 mol of Zn

Answer:

D = m/v

Explanation:

So m = 24g and v = 16mL. (I assume these are the units being used). Then, we get D = 24g/16mL which is 1.5 g/mL

Answer:

please mark as brainliest

Explanation:

ans: Gas

The particles of matter in the gaseous state are neither close together nor fixed in place. The gas expands to fill its container. Thus, a given number of particles will have the greatest volume in the gas state.30‏/06‏/2014

Isolation of p-tert-butylphenol: p-tert-butylphenol can be obtained from the reaction between p-cresol and isobutylene. It can be isolated by steam distillation followed by the crystallization process of the aqueous layer, which is used to precipitate the product from the solution.

The solvent is then evaporated under reduced pressure to obtain the product

The isolation of p-tert-butylphenol is a process that needs to be carried out carefully. The following steps can be used:

Steam distillation: A steam distillation process can be used to extract p-tert-butylphenol. This method is effective because p-tert-butylphenol is insoluble in water, but it will still be carried over by the steam.

The crude product is obtained by steam distillation of the reaction mixture

Crystallization: After obtaining the crude product, the aqueous layer is used to precipitate the product from the solution. The mixture is then cooled to room temperature, and crystals of p-tert-butylphenol start to form. The crystals are then filtered and washed with cold water to remove any impurities.

Solvent evaporation: After washing the crystals, the solvent is evaporated under reduced pressure. The remaining solid is then recrystallized in hot water and dried under vacuum.

Briefly, the isolation of p-tert-butylphenol involves steam distillation followed by the crystallization process of the aqueous layer, which is used to precipitate the product from the solution. The solvent is then evaporated under reduced pressure to obtain the product.

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Answer:

iv it does not make but if im wrong dont report please!

Answer:74

Explanation:

Answer:

I believe Tungsten has 2 valence electrons.

Explanation:

Hope this helps!

The number of amount of moles contained in 7.90 grams of carbon is 0.66 moles.

Mole is the base unit of amount of substance i.e. the amount of substance of a system which contains exactly 6.02214076 × 10²³ elementary entities.

The number of moles in a substance can be calculated by dividing the mass of the substance by its molar mass as follows:

no of moles = mass ÷ molar mass

According to this question, 7.90g of carbon is given.

molar mass of carbon is 12g/mol

moles = 7.90g ÷ 12g/mol

moles = 0.66 moles

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Yeast is a type of fungus that can ferment certain substances, meaning it breaks down sugars and converts them into alcohol and carbon dioxide. The ease with which a substance is fermented by yeast depends on a few factors, including the type of yeast being used and the composition of the substance itself.

Generally speaking, substances that contain a high amount of simple sugars are more easily fermented by yeast. This is because yeast is able to quickly and efficiently break down these sugars into alcohol and carbon dioxide. Examples of substances that are easily fermented by yeast include fruit juices, honey, and molasses.

On the other hand, substances that are more complex or contain less sugar may be more difficult for yeast to ferment. For example, yeast may have a harder time breaking down starches, such as those found in grains, without additional processing steps.

It's worth noting that different strains of yeast may also have varying levels of ability to ferment certain substances. Some strains may be better suited for fermenting certain types of beer or wine, for example, while others may be more effective at fermenting bread dough.

Overall, the ease with which a substance is fermented by yeast depends on a variety of factors, and may require some trial and error to determine the best approach for a particular substance.

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Answer: 4.35%

Explanation:

Scientists estimate that the current composition of gases in the Earth's atmosphere has been stable for the last 200 million years or so.

If the Earth was formed 4,600 million years ago then the percentage of her age that the atmosphere has been in its composition is:

= 200 / 4,600 * 100%

= 4.35%

Dietary protein will not be digested if Hcl were not being produced in sufficient quantities.

In the stomach, there are some glands found on the stomach lining that helps to release hydrochloric acid (HCl). Their major role is to dissolve food and produce an acidic medium.

The acidic media promotes and improves the conversion of pepsinogen to pepsin. Pepsin acts as an enzyme that supports protein digestion.

Protein digestion requires a pH of around 1.8 which can be achieved by the secretion of HCl.

As a result, if HCI is not released in the stomach in sufficient quantities, pepsin will not be activated and it would have a detrimental impact on protein digestion.

Therefore, we can conclude that dietary protein will not be digested if Hcl were not being produced in sufficient quantities.

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The components of the carbon cycle that would be classified as fast processes include:1. Photosynthesis 2. Respiration
3. Decomposition of organic matter 4. Dissolution of CO2 in the ocean 5. Release of CO2 by burning fossil fuels.

The carbon cycle is the process by which carbon, a crucial element for life on Earth, is exchanged and recycled among different reservoirs, such as the atmosphere, oceans, land, and living organisms. Some processes in the carbon cycle are considered fast processes due to their relatively rapid rates of carbon exchange.

Photosynthesis: Photosynthesis is the process by which plants and other photosynthetic organisms use sunlight, carbon dioxide (CO2), and water to produce organic matter and release oxygen.

Respiration: Respiration is the process by which living organisms, including plants, animals, and microorganisms, release energy by oxidizing organic carbon compounds and producing CO2 as a byproduct.

Decomposition of organic matter: Decomposition is the breakdown of dead organic matter by microorganisms, such as bacteria and fungi, into simpler organic compounds and eventually into CO2.

Dissolution of CO2 in the ocean: Dissolution of CO2 in the ocean is a fast process in which atmospheric CO2 dissolves into the surface waters of the ocean, forming dissolved carbon species such as bicarbonate and carbonate ions.

Release of CO2 by burning of fossil fuels: Burning of fossil fuels, such as coal, oil, and natural gas, releases CO2 into the atmosphere as a byproduct of combustion.

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There are several changes in blood chemistry that can lead to an increase in respiration.

One of the most significant factors is the buildup of carbon dioxide in the bloodstream. As carbon dioxide levels rise, the body's respiratory system responds by increasing the rate and depth of breathing to expel excess CO2 and maintain proper blood pH levels.
Another factor that can increase respiration is a decrease in oxygen levels in the blood. When oxygen levels drop, the body attempts to compensate by breathing faster and deeper to take in more oxygen. This response is particularly important in situations where oxygen delivery to the body's tissues is compromised, such as during exercise or at high altitudes.

Overall, respiration is closely tied to blood chemistry, with many different factors influencing how and why we breathe. By maintaining a delicate balance of gases and nutrients in the bloodstream, our bodies are able to efficiently extract oxygen and eliminate waste products, ensuring that our cells and tissues receive the oxygen they need to function properly.

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Answer:

5.8

Explanation:

Answer:

balanced equation: CH₄ + 2O₂ → CO₂ + 2H₂O

Explanation:

Given sample: CH₄ + O₂ → CO₂ + H₂O

changes applied: CH₄ + 2O₂ → CO₂ + 2H₂O

Answer:

D. Stores calcium and phosphorus

Explanation:

Correct me if I'm wrong

The concentration of H⁺ ions is 1.19 x 10⁻³ M, and the pH is: 2.92, the concentration of H⁺ ions is 3.36 x 10⁻³ M, and the pH is: 2.47, the concentration of H⁺ ions is  3.1 x 10⁻⁹ M, and the pH is 8.51.

For KCHO₂, the dissociation reaction is: KCHO₂ + H₂O ↔ HCHO₂ + KOH

The equilibrium constant expression for reaction is:

Ka = [HCHO₂][OH⁻]/[KCHO₂]

Since KOH is a strong base, we can assume that all of it will react with the H⁺ ions from HCHO₂, leaving [OH⁻] = [KOH]. Thus, we can write:

Ka = [HCHO₂][KOH]/[KCHO₂]

Since [KOH] is equal to the initial concentration of KCHO₂ (0.20 M), and assuming that x is the concentration of HCHO₂ that dissociates, we can write:

Ka = x² / (0.20 - x)

Solving for x, we get:

x = sqrt(Ka*(0.20 - x)) = 1.19 x 10⁻³ M

Thus, the concentration of H⁺ ions is 1.19 x 10⁻³ M, and the pH is:

pH = -log[H⁺] = 2.92

For CH₃NH₃I, we need to first write the hydrolysis reaction:

CH₃NH₃⁺ + H₂O ↔ CH₃NH₂ + H₃O⁺

The equilibrium constant expression for reaction is;

Kb = [CH₃NH₂][H₃O⁺]/[CH₃NH₃⁺]

Since CH₃NH₃⁺ is the weak acid and CH₃NH₂ is the conjugate base, we can assume that [CH₃NH₃⁺] ≈ initial concentration of CH₃NH₃I (0.23 M). Thus, we can write:

Kb = x² / (0.23 - x)

where x is the concentration of CH₃NH₂ that forms. Since CH₃NH₂ is a weak base, we can assume that [H₃O⁺] ≈ 0. Thus, we can solve for x:

Kb = x² / (0.23 - x)

4.4 x 10⁻⁴ = x² / (0.23 - x)

x = 3.36 x 10⁻³ M

Thus, the concentration of H⁺ ions is 3.36 x 10⁻³ M, and the pH is:

pH = -log[H⁺] = 2.47

For KI, we need to consider the reaction of I- with water:

I⁻ + H₂O ↔ HI + OH⁻

The equilibrium constant expression for reaction is;

Kw/Kb = [HI][OH⁻]/[I⁻]

Since HI is a strong acid, we can assume that [HI] ≈ 0. Thus, we can write:

Kw/Kb = [OH⁻]/[I⁻]

where Kw is the ion product constant for water (1 x 10⁻¹⁴), and Kb is the base dissociation constant for I-. Solving for [OH⁻], we get:

[OH⁻] = (Kw/Kb) [I⁻] = (1 x 10⁻¹⁴)/(5.9 x 10⁻¹⁰) [0.19] = 3.22 x 10⁻⁶ M

Thus, the concentration of H⁺ ions is:

[H+] = Kw/[OH⁻] = 3.1 x 10⁻⁹ M

and the pH is:

pH = -log[H⁺] = 8.51

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Answer: B. forests are carbon sinks because they store carbon

Explanation:forests take up carbon from the atmosphere through photosynthesis and from organic matter through decomposition. so, forests are carbon sinks because they store carbon

Answer:

Lawrencium (Lr)

Explanation:

The element with the given electron configuration is Lawrencium (Lr), which has an atomic number of 103.

Answer:

See explanation

Explanation:

The reaction of NaOH and KHP is a neutralization reaction. The molarity of KHP is often calculated from the mass of KHP used to prepare the standard solution.

KHP is a slightly acidic substance. It is used as a primary standard for acid-base titrations because the solid is stable in air hence it is easy to weigh accurately. Also, the solid is neither hygroscopic nor deliquescent.

If student A recorded the amount of KHP used for the titration as 0.10g instead of 0.15g, then the molarity of NaOH calculated will be less than the actual the actual molarity of the NaOH.

The metabolite of toluene that is formed via oxidation by cytochrome P450 enzymes is benzyl alcohol. This metabolite is less toxic than the electrophilic epoxide formed from benzene oxidation, and is rapidly excreted from the body.

The reason for the difference in metabolism between toluene and benzene lies in their respective chemical structures. Benzene has a planar, cyclic structure with delocalized pi-electrons, making it highly reactive and capable of forming electrophilic species that can damage biological molecules.

Toluene, on the other hand, has a methyl group attached to the benzene ring, which makes it less reactive than benzene. This methyl group serves to protect the aromatic ring from oxidation, resulting in the formation of a less toxic metabolite in the case of toluene oxidation.

Additionally, the metabolism of toluene can be further modified by conjugation with glucuronic acid, which enhances its rapid excretion from the body.

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Explanation:

its the vaporizer that air brun

Answer: In CaF2, the oxidation number of Ca is +2

, and that of F is -1

. In H2SO4, the oxidation number of H is +1

, that of S is +6

, and that of O is -2

. In CaSO4, the oxidation number of Ca is +2

, that of S is +6

, and that of O is -2

. In HF, the oxidation number of H is +1

, and that of F is -1

Answer:

The level of colored liquid rises when the thermometer is placed in hot water. Heat causes the molecules of the liquid to get farther apart. The molecules of the liquid break down into atoms and take up more space.

Explanation:

Fossil fuels (coal, natural gas, and petroleum), air, water, salt, limestone, sulphur, and some specialty raw materials for special goods, like phosphates and the mineral fluorspar, are all examples of raw materials.

Sand (including silica sand), clay, hard rock, limestone (including metallurgical limestone), gravel, and other building and road-building supplies are considered basic raw materials (BRM). It also includes elements used to improve agricultural soil, such as limesand and gypsum.

Direct and indirect raw materials can be separated into two categories. The finished product contains direct materials. Examples are the fabric used to produce clothing or the wood used to make furniture. Throughout the process, indirect materials are used.

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The complete question is -

What are the sources of chemical raw material ?

Applications of anaerobic respiration is generating microbial fuel cell

Anaerobic respiration is the because of lack of oxygen they carry out respiration in the absence of oxygen to produce the energy they require called as anaerobic respiration

Anaerobic respiration is useful generating microbial fuel cell which employ bacteria that respire solid electron acceptor to transfer electron from reduced compound to an electrode this process can simultaneously degrade organic carbon waste and generate electricity

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Answer:

andariamos flotando

Explanation:

Answer:

595 g will produce 5 mol of KBr

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 5 moles are there in  595 grams KBr.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically, the formula for number of mole can be given as

number of mole of KBr =given mass of KBr ÷ molar mass of KBr

Molar mass of 1 mole of KBr=  119 g/mol

mass of KBr=  595 grams

substituting all the given values in the above equation, we get

number of mole of KBr= 595  ÷  119

On calculation, we get

number of mole of KBr = 5 moles

Therefore, 5 moles are there in  595 grams KBr.

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A 25.0-ml sample of 0.10 M HCl is titrated with the 0.10 M NaOH. The pH of the solution after the 12.7 ml of NaOH have been added to the acid is 1.4.

The moles of the HCl = molarity × volume

The moles of the HCl = 0.10  × 0.025

The moles of the HCl = 0.0025 mol

The moles of the NaOH = molarity × volume

The moles of the NaOH = 0.10  × 0.0127

The moles of NaOH = 0.00127 mol

HCl  +  NaOH ----> NaCl  +  H₂O

0.0025 mol of the HCl  react with the 0.0025 mol

Remaining moles =  0.0025 - 0.00127

                             = 0.00123 mol

[H⁺] = 0.00123 / ( 0.025 + 0.0127)

       = 0.033 M

pH = - log [H⁺]

pH = 1.4

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CaI₂ + Hg(NO₃)₂ --------->HgI₂ + Ca(NO3)2

2Al + 3Cl₂ --------->2AlCl3

Ag + HCl ------->AgCl + H2

C2H2 + 5O2 --------> 4CO2 + 2H2O

MgCl₂ --------->Mg + Cl2

The metal is palladium. The density of a face-centered cubic (fcc) crystal can be calculated using the following equation:

ρ = (z * M) / (a^3 * N_A)

Where:

ρ is the density in g/cm^3

z is the number of atoms per unit cell

M is the molar mass of the metal in g/mol

a is the edge length of the unit cell in cm

N_A is Avogadro's number (6.022 x 10^23 atoms/mol)

We know that z = 4 for an fcc crystal, M = 106.42 g/mol for palladium, and a = 2(138 pm)/10^-12 = 1.422 Å = 1.422 x 10^-8 cm.

Plugging these values into the equation, we get:

ρ = (4 * 106.42 g/mol) / (1.422 x 10^-8 cm)^3 * 6.022 x 10^23 atoms/mol) = 11.9 g/cm^3

Therefore, the identity of the metal is palladium.

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