Select the correct answer. what type of creation story describes how earth originated from water? a. ex nihilo b. emergence c. world parents d. earth diver

The required results of personal exposures to fine particulate matter and black carbon in households cooking with biomass fuels in rural ghana is given below.

Abstract to look at cooking practices and 24-h personal and kitchen area exposures to fine particulate matter (PM2.5) and black carbon in cooks using biomass in Ghana. Researchers administered an in-depth survey to 421 households.

The majority of households cooked outdoors (55%; 231/417), used biomass (wood or charcoal) as their primary fuel (99%; 412/413), and cooked on traditional fires (77%, 323/421).  within the sub-sample of 29 households with complete, valid exposure monitoring data, the 24-h integrated concentrations of PM2.5 were substantially higher within the kitchen sample (mean 446.8 µg/m3) than within the personal air sample (mean 128.5 µg/m3). Black carbon concentrations followed the identical pattern such that concentrations were higher in the kitchen sample (14.5 µg/m3) than within the personal air sample (8.8 µg/m3). Spikes in real-time personal concentrations of PM2.5 accounted for the bulk of exposure; the most polluted 5%, or 72 min, of the 24-h monitoring period, accounted for 75% of all exposure. Two variables that had some predictive power for private  PM2.5 exposures were primary fuel type and ethnicity, while reported kerosene lantern use was related to increased personal and kitchen area concentrations of black carbon.

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The mass of 2 moles of zinc oxide (ZnO) is 162.76g/mol

The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.02214076×[tex]10^{23}[/tex] elementary entities.

As, we know that

moles = mass / molar mass

so, using the formula

2 = mass / 81.38

mass = 162.76g/mol

So,  the mass of 2 moles of zinc oxide (ZnO) is 162.76g/mol

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In the bicyclic structure of caffeine, two rings—one a six-membered ring and the other a five-membered ring—are fused together. Nitrogen, carbon, hydrogen, and oxygen are all components of the molecule.

Drinks that have had carbon dioxide added to them are referred to as carbonated beverages. Carbon dioxide lacks both flavour and colour. Carbonated beverages often start with either carbonated water or soda water, both of which qualify as carbonated beverages in and of themselves.

Six valence electrons make up an oxygen atom, of which two are required to form bonds and the remaining four are found in lone pairs. Similar to oxygen, nitrogen possesses five valence electrons, three of which are employed to form bonds while the remaining two are present as a lone pair.

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The percent by weight (w/w%) of sugar in soda : 9.459 %

To find the percentage the given data's are:

mass of sugar = 35 g

total mass = 370 g

Solution for the given values are,

%weight = (mass of solute : mass of solution) x 100%

Mass of solute = Mass of sugar = 35 grams

Mass of solution = Mass of ( solvent + solute) = water + sugar = 370 grams

The percent weight of sugar in soda :

= (35 : 370) x 100%

= 0.0945945

= 9.459 %

Therefore, the percent by weight (w/w%) of sugar in soda : 9.459 %

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The concentration or Molarity of bromide ion in the sample solution is 0.077 M.

In the given question,

0.361 g AgBr × (1 mol AgBr/187.77 g AgBr) × (1 mol Br⁻/1 mol AgBr) × (80.0 g Br⁻/1 mol Br⁻) = 0.1536 g Br⁻

0.1536 × (1 mol Br⁻/80.0 g Br⁻) = 0.00192 mol

Molarity = 0.00192  mol/0.025 L = 0.077 M

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The lower the pH of a solution, the more acidic the solution and the H+ concentration.

pH is the quotient that tells us the degree of acidity or basicity that a solution has. Then it can be said that it is a measure of the acidity of a solution. At pH, the hydrogen ion levels for the given solution are then measured.

If a solution has low pH levels, it indicates that there is a lot of acidity in it, that is, that there are many hydrogen ions contained in the solution. while if it has a high pH, ​​it tells us that the solution is alkaline, that is, it has low levels of hydrogen ions.

Therefore, we can confirm that the lower the pH of a solution, the more acidic the solution and the H+ concentration.

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The major organic product and its structure that is obtained from the sequence of reaction can be seen in the image attached.

Triethylene glycol, also known as TEG or triglycol, is a viscous liquid with no colour or smell and the molecular formula HOCH2CH2OCH2CH2OCH2OH. Vinyl polymers use it as a plasticizer. Additionally, it is a component of “Oust” and “Clean and Pure” air sanitising solutions.

It functions as a disinfectant when aerosolized.

A TEG Gas Dehydration Unit, To remove water vapour from newly recovered natural gas, a triethylene glycol (TEG) gas dehydration system is put up.

This drying apparatus extracts water from a stream of natural gas flowing over it by using liquid triethylene glycol as its dehydrating agent.

Commercially, triethylene glycol is created as a byproduct of ethylene oxidation at high temperatures.

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Poêléing is the process of frying chicken in hot fat before wrapping it and baking it.

What is Poêléing?

In the dry-heat cooking technique known as poêléing, the food is cooked in its own juices in a covered pot, typically in the oven.

Poêléing is often referred to as butter roasting.

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The activity at 1 pm when the patient is injected is 6.3 mCi.

A quantity's half-life is the amount of time needed for it to decrease to half of its initial value.

The half-life of an isotope is 1.8 hours.

The sample prepared at 10 am has an activity of 20 mCi.

Now, the variation of activity with time is given as:

[tex]R = R_0 (\frac{1}{2} )^{ \frac{t}{t_{t_{1/2}} }[/tex]

We have, R₀ = 20 mCi

The half-life, [tex]t_{\frac{1}{2} } = 1.8 {~}\text{hours}[/tex]

Now, the activity is calculated at 1 pm.

So, t = 1 pm - 10 am = 3 hrs

Therefore, the activity at 1 pm will be:

[tex]R = R_0 (\frac{1}{2} )^{ \frac{t}{t_{t_{1/2}} }[/tex]

[tex]R = 20 \times (\frac{1}{2} )^{\frac{3}{1.8} }[/tex]

[tex]R = 20 \times (\frac{1}{2} )^{1.67}[/tex]

R = 20 × 0.31425334363

R = 6.28 mCi

R = 6.3 mCi

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None of the above.

Since none of the given option is a chemical property, rather all of them are physical method of separation and physical methods do not require a chemical change.

Solubility- It is a physical property because it is easily discernible through observation and does not alter the substance's chemical makeup. For instance, salt is still salt when it dissolves in water.

Evaporation - The chemical composition of a liquid does not change when it evaporates. The only alteration is a phase shift brought on by pressure and temperature. Evaporation, or the phase transition from liquid to gas, is a physical change as a result.

Filtration - Filtration is a physical separation procedure that uses a filter medium with a complicated structure that only allows fluid to pass through it to separate solid particles and liquid from a combination.

Therefore, neither new nor broken chemical bonds are created or broken during the separation. During the separation, bonds are severed or strengthened.

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The answers are given below as ,

a. There are 12 moles of oxygen are in one mole of iron (III) sulfate .

b. There are three atoms of sulfur are in on formula unit of iron (III) sulfate .

c. There are  two iron atoms are in one mole of iron (III) sulfate .

d. The average mass in amu's of one formula unit of iron (III) sulfate one formula unit of iron (III) sulfate .

e. The molecular mass of one mole of iron (III) sulfate is 399.88 g/mol

The average mass of the atoms in a naturally occurring sample of an element is the average atomic mass, also known as atomic weight. Unified atomic mass units (u), where 1 u is equal to precisely one-twelfth the mass of a neutral atom of carbon-12, are the standard units used to express average masses.

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Before washing the substance on the filter, petroleum ether is poured into an ice water bath to assist stop the product from dissolving.

Re-crystallization procedures only work based on the solubility properties of the compound of interest. The re-crystallization experiment cannot be performed using a solvent if the compound of interest is not soluble in it. For example, if I chose petroleum ether as my solvent instead of water, my recrystallization experiment will not work because acetanilide is not at all soluble in petroleum ether. In order for my recrystallization experiment to be successful, I need an efficient solvent for acetanilide. Acetanilide should only be dissolved by this solvent at temperatures above room temperature. Additionally, my solvent for acetanilide should be soluble for the impurities species at all temperatures. Since petroleum ether does not meet these requirements, the experiment will not be successful with petroleum ether.

Petroleum ether may not react with the product on the filter, however, the majority of organic molecules are generally non-polar and soluble in petroleum ether. Temperature lowers solubility Petroleum ether is cooled in an ice water bath to stop the product from dissolving in the solvent.

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I will conclude that, no, the polarities of the compounds must be extremely similar for them to have the same Rf value rather than being identical.

What is Rf?

The proportion of an analyte in a chromatographic system's mobile phase is known as the retention factor in the field of chromatography. The retention factor (RF), specifically in planar chromatography, is calculated as the ratio of the path taken by a spot's center to that of the solvent front.

The retention factor (Rf) is a comparison and identification tool used in thin-layer chromatography. A compound's Rf value is determined by dividing the distance it travels by the the solvent front travels (both measured from the origin).

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Answer:

C.) They both have equal charges.

Explanation:

Ignoring the signs, both a proton and electron have a charge of 1.

A proton has a greater magnitude of charge than an electron.

Both protons and electrons have charges, but the magnitudes of their charges are different. A proton carries a positive charge of +1 elementary charge, while an electron carries a negative charge of -1 elementary charge. The elementary charge is the fundamental unit of electric charge. Despite the opposite signs of their charges, the magnitudes are equal, and both charges have the same strength.

Therefore, when ignoring the sign of the charges and considering only their magnitudes, a proton has a greater magnitude of charge compared to an electron. The magnitude of the proton's charge is equal to that of the electron's charge. This is a fundamental property in the realm of electric charges, and it plays a critical role in various physical and chemical interactions, including the behavior of atoms, molecules, and electromagnetic forces.

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3.4 [tex]\times[/tex]  [tex]10^{-9}[/tex]

Energy is emitted by 9.4 mg of sodium atoms emitting light at a wavelength of 5.8[tex]\times[/tex][tex]10^{-7}[/tex] m. Answer in units of J.

From the above statement , we have got

Energy ( E) = ?

5.8[tex]\times[/tex][tex]10^{-7}[/tex] m

Planck's constant (h) =  6.62607015×[tex]10^{-34}[/tex] joule-[tex]hertz^{-1}[/tex]

nowwe have to find energy,

by using E = hc/λ,  here c is the speed of light,

c = 3 [tex]\times[/tex] [tex]10^8[/tex] m/s

now puttin all  the values in equation

E =  6.6×[tex]10^{-34}[/tex] [tex]\times[/tex]3 * [tex]10^8[/tex] /  5.8[tex]\times[/tex][tex]10^{-7}[/tex]

E = 6.6[tex]\times[/tex] 3[tex]\times[/tex] [tex]10^{-9}[/tex]/5.8

E = 3.4[tex]\times[/tex] [tex]10^{-9}[/tex]

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Cl3C --OH

Cl3C ---Oh products do you expect from the reaction, after acidifying the reaction mixture.

What is acidifying?

Lowering a sample's pH below 2.0 by adding an acid (often nitric or sulfuric). A sample is fixed by acidification in order to prevent change until it is analysed.

Therefore,

What products do you expect from the reaction, after acidifying the reaction mixture?

Cl3C --OH

Cl3C ---Oh Oh products do you expect from the reaction, after acidifying the reaction mixture.

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Answer:

C

Explanation:

because it is the only one that will give you an accurate answer.

Try 25% ethyl acetate to see the results, this is because adding more ethyl acetate will increase the polarity and the compounds get easily separated.

In TLC, the polarity between the stationary phase and mobile phase is the basis for mixture separation. In accordance with the "like dissolves like" principle, polar substances can only dissolve in other polar substances, while non-polar substances may only dissolve in other non-polar substances.

Consequently, when two compounds with different levels of polarity are present, the more polar molecule interacts with silica more strongly and is, therefore, better able to displace the mobile phase from the accessible binding sites. The less polar compound thus travels higher up the plate (resulting in a higher Rf value).

However, changing the mobile phase to a more polar solvent or a mixture of solvents improves binding to the polar plate and thereby displaces solutes from it, causing all compounds on the TLC plate to rise higher up the plate. It is a prevalent belief that although "weak" eluents hardly move the examined compounds, "strong" eluents drive them up the plate.

Therefore, all compounds move longer and have a larger Rf when a mobile phase is made more polar than it was originally.

Since hexane has a non-polar property while ethyl acetate has a polar property. As a result, adding 35% ethyl acetate will enhance the polarity, making it easier to separate the compounds.

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The liquid iron flows in a spiral pattern and creates a bipolar magnetic field does the iron in the outer core, spiral because liquid iron has a natural spin that causes the helical spiral pattern. Thus, option (B) is correct.

Helical flow is the cork-screw-like flow of water in a meander. It is one example of a secondary flow. Helical flow is a contributing factor to the formation of slip-off slopes and river cliffs in a meandering section of the river.

Meanders start when friction with the channel bed and banks causes turbulence in the water flow. This results in a spiraling flow of water called helical flow- a corkscrew-like movement of the water as it spirals downstream from bank to bank. Thus, option (b) is correct.

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oxidation number or state of copper in solid copper is zero

The oxidation state of all element is zero in solid sate, while it can different in liquid or gas state.

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Answer:

The Moon has a diameter of 2,159 miles (3,476 kilometers) and is about one-quarter the size of Earth. The Moon weighs about 80 times less than Earth.

Explanation:

The amount of copper produced might be less than 100% of the expected amount because the actual yield is usually less than the theoretical yield.

The efficiency of yield is calculated in the form of %age yield by the following formula

%age yield = actual yield/theoretical yield x 100%

The actual yield is often less than the theoretical yield due to the following reason

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The procedure that involves physical change in one substances is Separating a salt solution by evaporating the water.

What is physical change ?

A change that cannot be undone is referred to as a physical change. There is no development of a new substance with a physical change. The substance, size, color, or form of the compound undergoing this alteration may only be slightly altered. The physical aspect or appearance of the compound may alter in this form of modification (physical change), but the chemical makeup of the material is unaffected in any manner.

These alternatives aren't instances of physical changes:

- creating salt by reacting sodium metal and chlorine gas

- allowing a nail to rust

- building a model rocket propelled by mixing baking soda and vinegar

The following is an illustration of a physical change to an option:

Separating a salt solution by evaporating the water.

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Discoveries were made by j. j. thomson, henri becquerel, and lord rutherford.

What is Dalton's atomic model?

John Dalton, an English physicist and chemist, proposed the atomic hypothesis in 1808 as a scientific theory about the composition of matter. It claimed that tiny, indivisible particles called "atoms" make up all substance.

Almost all of chemistry at the time could be explained by Dalton's atomic model, a relatively straightforward combinatorial concept that paved the way for later advancements and advances in this and many other scientific domains. Postulates of the Dalton Model

Modern atomic theory and the discovery of the electron and proton were made possible by Thomson's cathode ray discharge experiment and Rutherford's scattering experiment.

Dalton's concept was groundbreaking at the time and provided a wealth of information for young chemists to study. Many people contributed to the modification of the Atomic theory following Dalton, including Chadwick, JJ Thompson, Ernest Rutherford, Niels Bohr, and others. Later, Rutherford worked on the model to find the nucleus while JJ Thompson made the electron discovery.

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water bath cannot exceed 100 (°C)  and alcohol C AND alcohol D have a boiling point above 100 (°C) , therefore hot water bath cannot be used to separate alcohols C and D

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AB is an ionic Compound , BC is covalent Compound , AC is an Ionic Compound.

Now,

 A = 0.9

 B = 3.0

 C = 3.5

AB is an ionic compound. If the difference of electronegativity between two atoms is more than 1.7 , then they will form ionic compound. Here A is Cation and B is Anion .

     Hence AC is an ionic compound.

A is Cation and B is Anion .

      Hence BC is a covalent Compound.

Thus , from the above conclusion we can say that, AB is an ionic Compound , BC is covalent Compound , AC is an Ionic Compound.

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Compound B is nonpolar, compounds C and E are polar, compounds A and D are amphiphilic.

Amphiphilic molecules are what?

An amphiphilic molecule is any substance that has two separate covalently bonded parts with contrasting solvent affinities, where one half has a strong affinity for nonpolar solvents and the other part has a high affinity for polar solvents (like water).

What polar and nonpolar molecules?

Polar molecules are created when the bonded atoms have differing electronegativities. Nonpolar molecules are created when the polar bonds in a larger molecule cancel each other out or when the electrons in a diatomic molecule are equally distributed among the atoms.

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some regions of a polypeptide may coil or fold back on themselves. this is called secondary structure , and the coils or folds are held in place by hydrogen bonds

After translation, primary structure is just the arrangement of amino acids. The interactions between the carbonyl, amino, and side groups of the amino acid polymer backbone inside the chain result in the secondary structure of proteins. These interactions are primarily fueled by hydrogen bonds, which result in the formation of alpha helices and beta sheets, which are the primary features of proteins' secondary structures.

To create a useful three-dimensional structure, tertiary structure requires more interactions within the protein chain. Disulfide bonds between cysteines, hydrophobic contacts, ionic bonding, and dipole-dipole interactions are a few of these interactions. To create a useful, three-dimensional protein structure, several protein chains interact in quaternary structure.

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3. Environmental chemistry

4. Biochemistry

5. Inorganic Chemistry

6. Organic chemistry

The two compounds are Identical because they share the same intense quality, is the answer.

The boiling point is a bulk property, meaning that it is a property of a substance or sample that does not change as the amount of the substance or sample changes. This is the right response because of this.

Density is one characteristic that can be used to distinguish between two substances because different substances have distinct qualities. The density of an object is a characteristic that is independent of its size or shape.

Mass, weight, and volume are examples of extensive qualities that change depending on the amount of the substance.

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