calculate the molar concentration of the polycyclic aromatic hydrocarbon ( pah ), anthracene ( 178.23 g/mol), that was found in a well water sample at a concentration of 3.04 ppb. assume the density of the well water sample is 1.00 g/ml.

p-Ethylphenol (4-EP) is an organic compound with the formula C₂H₅C₆H₄OH.

It is one of three isomeric ethyl phenols. It is a white solid that occurs as an impurity in xylenol and is used as such in the manufacture of commercial phenolic resins. It is also a precursor of 4-vinylphenol. On average, 4-ethylphenol is most abundant in red wine. 4-Ethylphenol has also been detected but not quantified in several different foods such as B. Arabica coffee (Coffea arabica), beer, corn (Zea mays), milk (cattle), red raspberry (Rubus idaeus). Ethyl (ethyl group; Et):

Part of the molecular structure corresponding to ethane minus one hydrogen atom:

Sometimes abbreviated as - CH₂CH₃.

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The standard free energy change \(\Delta G^o\) is always positive for a reaction in an electrolytic cell.

An electrolytic cell is defined as a device that uses electrical energy to facilitate a non-spontaneous reaction.

The components of an electrolytic cell are

The standard Gibbs free energy, \(\Delta G^o\) is given by

\(\Delta G^o\) = -nFE°

where, n = no of moles of electrons gained or lose

F = Faraday's constant

E° = standard potential of cell

For electrolytic cells, the reaction is non-spontaneous and energy is provided. Thus, E = -ve

∆Go = (-ve) (-ve) = +ve

Hence, the standard free energy change is positive for a reaction in the electrolytic cell always.

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Answer:

C. The third option

Explanation:

Answer:

It is true , that the tropical zone experiences the trade winds .

Explanation:

TRADE WINDS -: The trade winds or easterlies are the dominant east-to - west permanent winds that flow in the equatorial area of the Planet (between latitudes 30 ° N and 30 ° S). In the Northern Hemisphere, the trade winds blow primarily from the northeast and from the southeast in the Southern Hemisphere, strengthening throughout the winter and when the Arctic oscillation is in its warm phase. Trade winds have been used by sailing ship captains for centuries to cross the world's oceans and have enabled colonial expansion into the Americas and the construction of trade routes across the Atlantic and Pacific oceans. They act as the steering flow for tropical storms in meteorology. developing over the Atlantic , Pacific, and Southern Indian Oceans and landing in North America, Southeast Asia, Madagascar, and East Africa. Under trade wind regimes, shallow cumulus clouds are seen and are capped from being larger by a trade wind inversion induced by downward air aloft from within the subtropical ridge.

When trade winds blow through tropical areas , due to more direct sunlight , air masses heat up across lower latitudes. Those that develop over (continental) land are drier and hotter than those that develop over (maritime) oceans and travel northward to the subtropical ridge 's western periphery. Masses of maritime tropical air are often referred to as masses of commercial air. There are extensive areas of trade winds in all tropical oceans except the northern Indian Ocean.

Hence , the statement is true.

Mothballs are made of naphtalene. The chemical structure of naphthalene is formed by two benzene rings, which gives this substance the classification of an aromatic compound.

The active principle of naphthalene is explained by a very interesting physical characteristic: sublimation, which is defined as the direct transition from a solid to a gaseous state. Once sublimated, naphthalene appears as a toxic vapor for undesirable microorganisms.

So, when a bag of mothballs is opened, they will sublime. So the molecules will not be able to come back to the bag, because they're in the gaseous state, which is too difficult for us to "pick up" the molecules of mothballs again and place them in their bag again.

It is like picking up water vapor, it is impossible.

Answer: Alternative "D"

The amount of heat absorbed to raise the temperature of 24.0 grams of aluminum from 300K to 350K is 1080J.

The amount of heat absorbed or released by a substance can be calculated as follows:

Q = mc∆T

Where;

According to this question, a solid aluminum has a specific heat capacity of 0.90J/g K. The amount of heat absorbed or released by the substance is calculated as follows:

Q = 24.0 × 0.90 × {350 - 300}

Q = 24.0 × 0.90 × 50

Q = 1,080 Joules

Therefore, 1080J is the amount of heat absorbed by the aluminium sample.

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An element is a pure substance that is made up of only one type of atom. In other words, all the atoms in an element are the same. Elements are the building blocks of matter and are the simplest form of matter that can exist. They make up everything around us, from the air we breathe to the things we touch and see.

Elements are identified by their atomic number, which is the number of protons in the nucleus of an atom. Each element has a unique number of protons, and this number determines the chemical properties of the element. For example, hydrogen has an atomic number of 1, which means it has one proton in its nucleus, while helium has an atomic number of 2, which means it has two protons in its nucleus.

Elements can be found on the periodic table, which is a chart that organizes elements by their atomic number, electron configurations, and chemical properties. There are currently 118 known elements, with hydrogen being the lightest and oganesson being the heaviest.

Some elements, such as gold and silver, are found in nature in their pure form, while others, such as carbon and oxygen, are found in compounds with other elements. Elements can also be combined to form more complex molecules, such as water (H2O) and glucose (C6H12O6).

Elements are classified into four main categories: metals, nonmetals, metalloids, and noble gases. Metals are solid and good conductors of heat and electricity, nonmetals are poor conductors of heat and electricity and are gases or brittle solids, metalloids have properties of both metals and nonmetals, and noble gases are gases that are unreactive chemically.

In summary, an element is a pure substance that is made up of only one type of atom and has unique chemical properties determined by its atomic number. They are the building blocks of matter and are organized on the periodic table.

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Answer:

153 g CO₂

Explanation:

To begin, the reaction is not in its simplest form. The coefficients can be divided by two. However, this will not change the answer.

CH₄ + 2 O₂ --> CO₂ + 2 H₂O

You can find the grams of CO₂ by taking the moles of O₂, using the mole to mole ratio of O₂ to CO₂ (via the coefficients), then converting moles of CO₂ to grams. You will need the molar mass of CO₂ since you want to convert it from moles to grams. This is calculated using the values on the periodic table. The ratios should be written in a manner that allows for the cancellation of units. The answer should have 3 sig figs.

12.011 g/mol + 2(15.998 g/mol) = 44.007 g/mol CO₂

6.95 moles O₂          1 mol CO₂           44.007 g CO₂
----------------------  x  -------------------  x  -------------------------  = 153 g CO₂

                                  2 mol O₂             1 mol CO₂

Using the change of base rule to find the logarithm to four decimal places. the correct answer is 11.4235.

To find the logarithm of 143.2 using the change of base rule, we can choose any base we prefer. Let's use base 10 and natural logarithm (base e) for this calculation.

First, we'll use the change of base formula, which states that log(base b) x = log(base c) x / log(base c) b. In this case, we'll calculate log(base 10) 143.2.

We'll use the natural logarithm (ln) as our intermediary step. The natural logarithm of 143.2 can be calculated as ln(143.2).

Using a calculator, we find that ln(143.2) is approximately 4.9628.

Next, we need to calculate log(base 10) e, which is the logarithm of e with base 10. Using a calculator, we find log(base 10) e is approximately 0.4343.

Finally, we apply the change of base formula:

log(base 10) 143.2 ≈ ln(143.2) / log(base 10) e
                ≈ 4.9628 / 0.4343
                ≈ 11.4235

Rounding to four decimal places, the logarithm of 143.2 using base 10 is approximately 11.4235.

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Answer:

The answer is 17km

Answer:

the answer is A ( The basement)

HOPE THAT HELPSSS!!!

Answer the basement

Explanation: i took the test

\(Number\;1:\;Formula.\\\\Number\;2:\;Solution\\\\Number\;3:\;Chemistry\\\\Number\;4:\;Solute\\\\Number\;5:\;Mass\\\\Number\;6:\;Matter\\\\Number\;7:\;Alloy\\\\Number\;8:\;Aqueous\\\\Number\;9:\;Quantitative\)

Answer:

1. formula

2. solution

3. chemistry

4. solute

5. mass

6. matter

7. alloy

8. aqueous

9. quantative

Explanation:

they are the answers!

The type of subatomic particles that can be located within the nucleus of an atom is protons and neutrons. The correct option is C.

Subatomic particles are those particles that are present inside the atoms. These are present in different locations inside the atom. They are charged particles.

An electron is a negatively charged particle that rotates around the nucleus and a neutron is neutral, and a proton is a positively charged particle. Proton and neutrons are present inside the nucleus.

Thus, the correct option is C. protons and neutrons.

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Answer:

Sulphate ion

Explanation:

Zinc will undergoes oxidation. Zn2+ - - > Zn + 2e-

Copper will undergoes reduction. Cu2+ + 2e- - - > Cu

Hydrogen sometimes is missing an electron and sometimes it has an extra electron.

Helium (He) and hydrogen (H) are unique elements. Hydrogen has the abilities and electrons of two groups, one and seven, and occasionally has more electrons than it does.

Electrons are defined as a subatomic particle with a negative charge that makes up the nucleus of an atom along with protons and neutrons. For scientists, it can be challenging to monitor them because of how quickly they spin. The tiniest particles in an atom, you can put 2000 of them into a proton, they are drawn to the positive charge of the protons.

Because it has no neutrons in its nucleus, hydrogen (particularly hydrogen -1) is unusual. There is only one proton in the nucleus of hydrogen. The only element without neutrons is this one. Although it has a single electron orbiting its nucleus as well, hydrogen typically contributes this electron to form a single, positively charged proton instead.

Thus, Helium (He) and hydrogen (H) are unique elements. Hydrogen has the abilities and electrons of two groups, one and seven, and occasionally has more electrons than it does.

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Answer:

That they are miscible in one another

Answer:

True

Explanation:

Answer:

It is true!

I hope this helps. Have an awesome day <3

An investigation is when you gather facts through observation, questioning, or studying.

Answer:

97.561 g/mol

Explanation:

The mass, in grams, of the chlorine gas will be 0.84 grams

At standard temperature and pressure, 22.4 L of gas has 1 mole of the gas in it.

This time, what we have is 265 mL of the gas at STP. 265 ml is equivalent to: 265/1000 = 0.265 L

If.

22.4 L = 1 mole

Then,

0.265 L = 0.265 x 1/22.4 = 0.01183 moles

This means that 0.01183 moles of chlorine is present in the gas at STP.

Mass of 0.01183 moles of chlorine = moles x molar mass.

The molar mass of chlorine gas is 71

Mass of the chlorine gas = 0.01183 x 71 = 0.84 grams

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Answer:

0.086

Explanation:

got it on acellus

The mass of the dry solute recovered from the given data is 0.086 g.  Option C

To determine the mass of the dry solute recovered, we need to subtract the mass of the boat from the mass of the boat with the dry solute.

Given the data provided:

Boat Mass: 0.730 g

Boat + Solution: 0.929 g

Boat + Dry: 0.816 g

To find the mass of the dry solute, we subtract the boat mass from the boat + dry mass:

Mass of Dry Solute = (Boat + Dry) - (Boat Mass)

Mass of Dry Solute = 0.816 g - 0.730 g

Mass of Dry Solute = 0.086 g

Therefore, the correct answer is c) 0.086 g.

The mass of the dry solute recovered from the given data is 0.086 g. It is important to note that the mass of the dry solute is obtained by subtracting the mass of the boat from the mass of the boat with the dry solute, as the boat mass represents the weight of the empty boat or container used in the experiment.

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Answer:

B.

Explanation:

Velocity: the speed of something given direction

Acceleration: increase or decrease of velocity over time

B is the answer because it is the only point on the image that has to slow down and change direction. To turn, a vehicle must slow down so it doesn't skid. Hope this helps!

A race car traveling around the racetrack at a constant speed of 150km/hr at B point on the track is the car accelerating.

Acceleration is the rate at which an object's velocity with respect to time changes. They are vector quantities, accelerations. The direction of the net force applied on the item determines the object's acceleration.

An item has positive acceleration if it is accelerating and travelling in the right direction. Positive acceleration was demonstrated in the first case by the fast automobile.

The acceleration is in the same direction as the car's motion since it is moving ahead and speeding up.

The equation a = v/t denotes acceleration ( a ), which is the change in velocity ( v ) over the change in time ( t ). This enables you to calculate the change in velocity in meters per second squared  ( m/s² ).

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There are three ways to find similarities in nucleotide and amino acid sequences they are Sequence Identity, Coverage and E-Value.

Proteins and amino acids share characteristics with nucleotides and nucleic acids. Nucleic acids, such as DNA (deoxyribonucleic acid) and RNA (ribonucleic acid), are constructed from monomers known as nucleotides, much like proteins are composed of a variety of amino acids. Sequence The percentage of overlapping, matching sites between two matched sequences is known as identity. It can be written as a percentage or as a fraction [0.0, 1.0]. The percentage of one sequence that is "covered by" (overlapped by) another sequence is known as coverage. Sequence B only covers 80% of Sequence A in the example above, while Sequence A covers 100% of Sequence B. (because of the two gaps). Similarity filters frequently examine the minimal "bi-directional" coverage (the lower of the two metrics).

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Answer:

C

Explanation:

Mitochondria provides energy (ATP) for cells to use

Nucleus provides genetic code (DNA)

Ribosomes assemble amino acids chains based on the DNA from nucleus to form proteins

Answer:

c

Explanation:

Answer:

The reaction of an acid and a base is called a neutralization reaction. ... However, in the reaction between HCl(aq) and Mg(OH) 2(aq), additional molecules of HCl and ... First, we will write the chemical equation with the formulas of the reactants ... The chloride ions are the only spectator ions  I THINKS

Explanation:

Answer:

physical change occured

Explanation:

it is still juice

Answer:

1.46mol of Al2(SO4)3 weights 499.5 grams

Explanation:

First we will find the gram formula mass of Al2(SO4)3.

Al * 2 = 26.98 g/mol * 2 = 53.96 g

SO4 * 3 = 96.06 g/mol * 3 = 288.18

53.96 + 288.18 = 342.14 g

That is the mass of 1 mol of AL2(SO4)3.

Now we will multiply 342.14g by 1.46.

342.14 * 1.46 = 499.5244 g

Or ... 499.5 g