Assume a 60-kg adult inhales23 m 3of air every day and the average air concentration of chemical A where they live is0.044mg/m 3. They also drink2 Lof water every day which has1ppmchemical A and 3 ppm chemical B in the water. For the adult in this problem, is their greater environmental risk associated with Chemical A or Chemical B? Show your work and explain your answer.

Answer:

Explanation:

Titration: titrate twice, the first time with an indicator to determine how much sodium hydroxide is needed to completely react with hydrochloric acid, and the second time without an indicator to prevent the contamination of the sodium chloride salt produced

The model that supports the evidences hat we have garnered from the experiment is the Bohr model.

We know that there are various models that can be used to obtain the structure of the atom. For each of the various models that try to explain the structure of the atom, there are experimental evidences.

In the case of the hydrogen atom atom as we have in this experiment, the model of the atoms that is supported is the Bohr model of the atom. According to the Bohr model of the atom, electrons in atoms are found in certain specific energy levels.

The electron would tend to release energy in the force of the photon of visible light when it moves from a higher to a lower energy level as we can see in the experiment. Thus the Bohr model suffices from the structure of the atom in this experiment.

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Answer:

The answer is false.

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Answer:

False

Explanation:

I think it's a chemical change when the composition of a substance changes and forms a new substance

According to the relation of variables in the electromagnetic spectrum the maximum wavelength of light is 36.3 ×10\(^-\)³¹ m.

The  electromagnetic spectrum consists of electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In the given problem,energy is related to wavelength by the formula, λ=hc/E,λ=6.626×10\(^-34\)×3×10⁸/547×1000=36.3×10\(^-31\) m.

Thus, the maximum wavelength of light is 36.3×10\(^-31\) m.

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When a ground state hydrogen atom absorbs a photon of light having a wavelength of 92.6 nm, the final state of the hydrogen atom is the excited state.

The hydrogen atom has only one electron, which is located in the ground state or the first energy level. When a photon of light of 92.6 nm wavelength is absorbed, the electron gains energy and jumps to the higher energy level, which is the second energy level (n = 2).

Thus, the final state of the hydrogen atom is the excited state or the second energy level. The energy absorbed by the electron is equal to the energy of the photon. The energy of a photon is given by the formula: Energy of a photon = hc/λwhere,h = Planck's constant = 6.626 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s λ = wavelength of the photon

Substituting the given values, we get

Energy of a photon = (6.626 x 10⁻³⁴ J.s x 3 x 10⁸ m/s) / (92.6 x 10⁻⁹ m)

Energy of a photon = 2.14 x 10⁻¹⁸ J. The energy absorbed by the electron is equal to the energy difference between the two energy levels.

The energy of an electron in the nth energy level of the hydrogen atom is given by the formula: E_n = (-2.18 x 10⁻¹⁸ J) / n² where, E_n = energy of electron in nth energy level

Substituting n = 1 (ground state), we get: E₁ = (-2.18 x 10⁻¹⁸ J) / (1)²   E₁= -2.18 x 10⁻¹⁸ J

Substituting n = 2 (excited state), we get: E₂ = (-2.18 x 10⁻¹⁸ J) / (2)²  E₂ = -0.545 x 10⁻¹⁸ J

The energy absorbed by the electron is the difference between the energy of the electron in the excited state and the energy of the electron in the ground state.

ΔE = E₂ - E₁

ΔE = (-0.545 x 10⁻¹⁸ J) - (-2.18 x 10⁻¹⁸ J)ΔE = 1.64 x 10⁻¹⁸ J

Since the electron gains energy, the energy absorbed by the electron is positive. Therefore, the final state of the hydrogen atom is the excited state.

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Explanation:

______________________

The Lewis structure of PCl3 can be represented as shown below:PCl3 is a Lewis acid because it can accept electron pairs from a Lewis base. The Lewis definition of an acid is a species that can accept an electron pair. PCl3 is an acid, whereas a Lewis base is a species that can donate an electron pair.

Phosphorus trichloride (PCl3) is a covalent compound. The P atom is the central atom and has 5 valence electrons. Each Cl atom has 7 valence electrons. The total number of valence electrons in the molecule can be calculated by summing the valence electrons of each atom. P has 5 valence electrons, while each Cl atom has 7 valence electrons.

(1 × 5) + (3 × 7)

= 26

valence electrons PCl3's Lewis structure consists of a central phosphorus atom surrounded by three chlorine atoms. Each chlorine atom is connected to the central phosphorus atom by a single bond, and each chlorine atom has a lone pair of electrons. The remaining valence electrons on the central phosphorus atom can be arranged as a lone pair on the phosphorus atom. The Lewis structure of PCl3 can be represented as shown below:PCl3 is a Lewis acid because it can accept electron pairs from a Lewis base. The Lewis definition of an acid is a species that can accept an electron pair. PCl3 is an acid, whereas a Lewis base is a species that can donate an electron pair.

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Answer:

Carbon dioxide goes in and oxogen comes out

P.S. Sunlight needed for this process to work

Explanation:

Answer:

12.455≈12.5 tons

Explanation:

1 US gallon of water (gal) = 8.35 pounds of water (lb wt.)

so we divide 208,000 by 8.35 to covert to pounds

then divide the pounds by 2000 to convert to tons.

The molarity of a potassium hydroxide solution if 30.0 mL of this solution was completely neutralized by 26.7 mL of 0.750 M hydrochloric acid is 0.6675M.

Molarity is the concentration of a substance in solution, expressed as the number of moles of solute per litre of solution.

The molarity of a neutralization reaction can be calculated using the following expression;

CaVa = CbVb

Where;

26.7 × 0.750 = 30 × Cb

20.025 = 30Cb

Concentration of pottasium hydroxide= 0.6675M

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The property of acids which would cause acid rain to damage buildings over time is:

Acids react with limestone.

The correct answer choice is option c.

This simply means that acids has this property which corrodes the surface they come in contact with especially stones.

However, this can be done by coating the surface of metals, or carbonate by coating it with other metals. By so doing, this can prevent acid rain damage to it.

That being said, by default, concentrated acids are highly corrosive.

Coating surfaces of metals can prevent acid rain damage to it

This refers to a substance which when dissolved in water, it produces hydrogen ion as the only positive ion in the solution.

So therefore, the property of acids which would cause acid rain to damage buildings over time is acids react with limestone.

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The element that has the quantum numbers that have been shown is calcium.

We know that the quantum numbers has to do with the number that shows the arrangement of the electrons that we find in the atom. We know that the manner in which the electrons can be filled in the atom can be given by the Aufbau principle.

Now we know that we have the quantum numbers; 4,0,0,-1/2. The implication of this is that the electron is in a 4s shell from the quantum numbers that we have here.

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The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

Cobalt;nitrite

Explanation: there is none that is the compound

Answer:

CoNO2 is an ionic compound and is composed of cobalt cation (having +2 valency) and nitrite anion.

Explanation:

The chemical formula of cobalt cation is Co2+ and the formula of nitrite ion is NO−2 . When writing the name of an ionic compound, the name of the cation is written first and then the name of the anion. So, the name of CoNO2 is Cobalt (II) Nitrite.

While there are several derived mammalian characteristics that define this group of animals, there are also some traits that are not considered unique to mammals. Egg-laying and the lack of a diaphragm in some mammals are examples of traits that are not derived mammalian characteristics.

Derived mammalian characteristics are those traits that distinguish mammals from other animal groups. Some of the derived mammalian characteristics include the presence of mammary glands, hair, three middle ear bones, and a neocortex. These traits are unique to mammals and have been developed throughout evolution to help them survive in their environments. However, there are some traits that are not considered derived mammalian characteristics.
One of the traits that is not considered a derived mammalian characteristic is egg-laying. While most mammals give birth to live young, there are some mammals such as the platypus and echidna that lay eggs. This trait is not unique to mammals and is also seen in other animal groups such as reptiles and birds.
Another trait that is not considered a derived mammalian characteristic is the lack of a diaphragm in some mammals. While most mammals have a muscular sheet called the diaphragm that separates the thoracic and abdominal cavities and aids in breathing, some mammals such as sloths and armadillos lack a fully developed diaphragm.
In conclusion, while there are several derived mammalian characteristics that define this group of animals, there are also some traits that are not considered unique to mammals. Egg-laying and the lack of a diaphragm in some mammals are examples of traits that are not derived mammalian characteristics.

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To calculate the grams of NaCl in a 100 g solution with water, when the solution is 19% NaCl by weight, we can use the formula:

Grams of NaCl = Total weight of solution (in grams) × Percentage of NaCl / 100

In this case, the total weight of the solution is 100 g and the percentage of NaCl is 19%. Plugging in these values:

Grams of NaCl = 100 g × 19 / 100 = 19 grams

Therefore, there are 19 grams of NaCl in the 100 g solution.

Regarding the chemical reaction equation, to balance it, we can use the coefficients to adjust the number of atoms on each side.

The equation is: ___SO2 + ___O2 -> ___SO3

The correct balanced equation is: 2SO2 + O2 -> 2SO3

The coefficients in this balanced equation indicate that we need 2 molecules of SO2, 1 molecule of O2, and 2 molecules of SO3 to balance the reaction.

B. To calculate the density of a substance, we use the formula:

Density = Mass / Volume

In this case, the mass of the gasoline is given as 20.2 kg and the volume is given as 23.7 liters.

Density = 20.2 kg / 23.7 L

Calculating this:

Density = 0.851 Kg/L

Rounding this value to the correct significant figures gives:

Density = 0.85 Kg/L

Therefore, the density of gasoline is approximately 0.85 kg/L.

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To determine the number of grams present in 2.93 x 10²³ atoms of manganese (Mn), we need to use the atomic weight of manganese and Avogadro's number.

The atomic weight of manganese is 54.94 g/mol. Avogadro's number is 6.022 x 10²³ particles per mole.

First, we need to convert the given number of atoms to moles using Avogadro's number.

2.93 x 10²³ atoms Mn x (1 mol Mn/6.022 x 10²³ atoms Mn) = 0.0485 moles Mn

Next, we can use the atomic weight of manganese to convert moles to grams.

0.0485 moles Mn x (54.94 g Mn/mol) = 2.67 grams Mn

Therefore, 2.93 x 10²³ atoms of manganese (Mn) weigh approximately 2.67 grams.

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The half life of the sample is 14 hours and the time taken is 97 hours.

We know that radioactivity has to do with the fact that there is element decomposed within a given time frame. Let us note that the half life has to do with the time taken for only half of the radioactive material to remain.

We can see that the time that is taken for only half of the sample to remains is about 14 hours.

We now know that;

N/No = (1/2)^t/\(t_{\frac{1}{2} }\)

N = Number of atoms

No = Initial number of atoms

t = time taken

\(t_{\frac{1}{2} }\) = The half life

Then we have;

2.5/320 = (1/2)^ t/14

7.8 * 10^ -3 = (0.5)^t/14

ln(7.8 * 10^ -3 ) = t/14 ln(0.5)

t = ln(7.8 * 10^ -3 ) / ln(0.5) * 14

t = -4.8/-0.693 * 14

t = 97 hours

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Answer:

e. 327/227

Explanation:

This is the correct standard pressure.

Hydrogen peroxide is commonly used for the disinfection of drinking water, disinfection of medical equipment, sterilization of diagnostic instruments, and skin and wound cleansing.

Hydrogen peroxide (H₂O₂) is a versatile chemical compound with strong oxidizing properties, making it effective for various disinfection and sterilization purposes. It can be used in multiple settings for different applications.

Disinfection of drinking water: Hydrogen peroxide can be used as a disinfectant to kill bacteria, viruses, and other microorganisms in drinking water, ensuring its safety for consumption.

Disinfection of medical equipment: Hydrogen peroxide is commonly used in healthcare settings to disinfect medical equipment, such as surgical instruments and surfaces, to prevent the spread of infections.

Sterilization of diagnostic instruments: Hydrogen peroxide is also utilized for the sterilization of diagnostic instruments, such as endoscopes and ultrasound probes, to eliminate any potential pathogens and maintain a sterile environment for medical procedures.

Disinfection of food preparation equipment: In the food industry, hydrogen peroxide can be used to disinfect food preparation equipment, such as countertops, cutting boards, and utensils, to ensure food safety and prevent cross-contamination.

Skin and wound cleansing: Hydrogen peroxide is commonly used for cleaning and disinfecting skin and wounds. It can help remove debris, kill bacteria, and promote the healing process.

Overall, hydrogen peroxide's antimicrobial properties make it a valuable tool for various disinfection and sterilization purposes in different settings, contributing to maintaining hygiene and preventing the spread of infections.

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Answer:

0.0066 has 2 significant figures

Explanation:

The flaw in the representation is likely the absence of an external source of energy, as indicated in (option C). The electrolytic cell requires an external energy supply to drive the thermodynamically unfavorable decomposition of NaCl into Na and Cl₂.

The flaw in the representation can be identified by analyzing the given options:

A. Oxidation is occurring at the anode.

This statement is correct in terms of the electrolytic cell setup. Oxidation does occur at the anode, where chloride ions (Cl-) are oxidized to form chlorine gas (Cl₂).

B. Molten Na is shown at the cathode.

This statement is also correct. In the electrolytic cell, sodium ions (Na+) are reduced at the cathode, resulting in the formation of molten sodium (Na).

C. An external source of energy is not shown.

This statement is the most likely flaw in the representation. The decomposition of NaCl into Na and Cl₂ is an endothermic process, meaning it requires an input of energy from an external source for the reaction to proceed. The representation should include an external power supply or energy source to drive the electrolytic cell.

D. The direction of the electron flow in the wires is incorrect.

Without more specific information or visual representation, it is difficult to determine if the direction of electron flow in the wires is incorrect. This option cannot be confirmed as a flaw based solely on the information provided.

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Answer:

7,540,000 mg

Explanation:

1 kg = 1,000,000 mg

7.54 kg x 1,000,000= 7,540,000 mg

Answer:

Can u phrase differently?

Answer:

If you are looking for the formula, then it is NaOCl

Explanation:

The compound that does not have the molecular formula C6H14O is cyclohexanol. Cyclohexanol is an aromatic alcohol with the molecular formula C6H12O.

Here correct answer is E

It is an organic compound that has a cyclohexane ring with a hydroxyl group substituent at one of the ring's carbon atoms. It is a colorless, flammable liquid with a strong odor. It is used in various industrial processes and has a variety of applications in the pharmaceutical industry.

Cyclohexanol is also used as a solvent, a raw material in the production of synthetic rubber, and as an intermediate in the manufacture of pharmaceuticals. The other compounds listed all have the molecular formula C6H14O, with the exception of 2-hexanol, which has the molecular formula C6H14O2.

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Answer:

A bee sting has a ph of 5, and is therefore an acid. Litmus paper goes red (or stays red) in acidic solutions.

Answer:

The Blue Litmus Paper should turn red

Explanation:

Bee venom has a pH of 5.5, which means it is mildly acidic which in turn should make the Litmus paper turn Red. Hope this helps!

Answer:C.

Explanation:

Answer:

313.2 g of \({K_{2} }S O_{4}\)  must be added to 1.20 liters of water to produce a 1.50 molar solution.

Explanation:

What is molarity?

According to the given question,

Solution :

∴ Number of moles of solute, here, \({K_{2} }S O_{4}\)

= molarity x volume of the solution

= 1.20 x  1.50 = 1.8

∴ Mass of 1.8 moles of \({K_{2} }S O_{4}\) = 1.8 x molar mass of   \({K_{2} }S O_{4}\)  

Now the molar mass of \(K_{2} SO_{4}\)

= (Gram atomic mass of K x 2) + (Gram atomic mass of S) + (Gram atomic mass of O x 4)

= (39x2) + 32 + (16 x 4) g

= 174 g.

∴ Mass of 1.5 moles of \({K_{2} }S O_{4}\)

= 1.8 x molar mass of   \({K_{2} }S O_{4}\)  

= 1.8 x 174 g

= 313.2 g.

Thus, 313.2 g of \({K_{2} }S O_{4}\)  must be added to 1.20 liters of water to produce a 1.50 M solution.

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