I need help with this question on this picture please and thank you very much

To make 879g of 42.0% salt water, 368.18g of salt is needed.

To make 879g of 42.0% salt water, you need to add salt to water until the desired concentration is achieved. The desired concentration can be expressed as a fraction or as a percentage. In this case, 42.0% salt by mass means that 42.0% of the solution is made up of salt and the remaining 58.0% is made up of water.

To calculate the amount of salt needed, first convert the percentage to a decimal by dividing by 100. In this case:

42.0% / 100 = 0.42.

Then, multiply the total mass of the solution (879g) by the decimal concentration of salt (0.42) to find the amount of salt required:

879g × 0.42 = 368.18g.

Therefore the amount of salt that needs to be added to make a 42.0% salt water is 368.18 gram

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Answer:

70.1 liters

Explanation:

At Standard Temperature and Pressure (STP), the conditions are defined as a temperature of 0°C (273.15 K) and a pressure of 1 atm. To calculate the volume that 3.20 moles of oxygen gas would occupy at STP, we can use the Ideal Gas Law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Substituting the known values:

P = 1 atm

n = 3.20 moles

R = 0.0821 L·atm/mol·K

T = 273.15 K

Solving for V:

V = (nRT) / P = (3.20 moles * 0.0821 L·atm/mol·K * 273.15 K) / 1 atm = 70.1 liters

In conclusion, 3.20 moles of oxygen gas would occupy 70.1 liters at STP.

Monoxide, nitrogen oxides, particle pollution, hydrogen sulfide, and volatile organic substances are the top five air pollutants.

Carbon Monoxide

The burning of fuels in both industries and fuel engines generates NO2, the most hazardous of these compounds. High amounts can impede atmospheric vision and harm the animal heart and lungs.

The pollutants that pose the greatest threat to public health include sulfur dioxide, ozone, nitrogen dioxide, monoxide, and particulate matter (PM, CO, O3, and NO2) (SO2). Both brief and deepening to these different pollutants can result in health concerns.

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Explanation:

Cu(OH)2 → CuO + H₂O

FW CuO 79.545 g

g CuO = 0.75 mol x 79.545 g/mol = 59.659 g

The concentration of bromide ions in the final solution is 0.75/100 = 0.225 M.

The concentration of bromide ions in the final solution is 0.225 M. To calculate this, you need to add up the moles of bromide ions present in each solution.

In the 0.15 M NaBr solution, there are 0.15 moles of bromide ions. Similarly, in the 0.30 M CaBr2 solution, there are 0.60 moles of bromide ions. Therefore, the total number of moles of bromide ions in the combined solution is 0.75 moles. Since the total volume of the solution is 100 mL, the concentration of bromide ions in the final solution is 0.75/100 = 0.225 M.

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The molality of a 5.36 m aqueous solution of ethylene glycol ((CH₂OH)₂, will be 0.065 mol/kg.

molality = (moles of solute) / (mass of solvent in grams)

Since the density of the solution is given, we can calculate the mass of the solution and then the mass of the solvent.

mass of solution = volume × density = 1 L × 1.0405 g/mL = 1.0405 g

mass of solute = mass of solution - mass of solvent = 1.0405 g - 1 L × (density of solvent)

Since water has a density of approximately 1 g/mL, the mass of solvent is 1 L × 1 g/mL = 1 g.

mass of solute = 1.0405 g - 1 g = 0.0405 g

moles of solute = mass of solute / molar mass of solute = 0.0405 g / 62.068 g/mol = 0.00065 moles

molality = (moles of solute) / (mass of solvent in grams) = 0.00065 mol / 1 g = 0.065 mol/kg.

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[tex]H_2 + Cl_2 -- > HCl[/tex] - synthesis reaction

[tex]Na + CuO_2 -- > Na_2O + Cu[/tex] - single replacement reaction

[tex]H_2O_2 -- > H_2 + O_2[/tex] - decomposition reaction

[tex]C_9H_{12} + O_2 -- > CO_2 + H_2O[/tex] - combustion reaction

There are different types of reactions based on the reactants and the products formed from reactions. Some of them are:

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The melting point of silicon dioxide SiO₂ is higher than the other given compounds because,  It consists of a strong covalent network and the bond between Si-O is strong.

Melting point of a substance is the temperature at which it converts from its  solid state to liquid state where the solid phase and liquid phase are in equilibrium.

Melting point of the substance depends on bond type, molar mass, temperature, pressure and presence of impurities. It increases with increase in the strength of intermolecular bonds.

The more the bond strength more energy needed to apply to weaken the bonds and melt the compound. Among the given compounds, silicon dioxide is having stronger covalent bonds. Hence, option A is correct.

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The body fluid compartments in a state of chemical disequilibrium, for example, potassium ions in the cytoplasm of red blood cells, which are larger than the extracellular fluid.

The fluids in the body, namely water and electrolytes, are contained in two main compartments, namely intracellular fluid and extracellular fluid. Extracellular fluid is derived from body weight and interstitial fluid which consists of fluid in the serous cavities.

The body will perform homeostasis to maintain the stability and balance of osmotic fluids in the body. Fluids that come from food and drink enter the body and are distributed normally to all parts of the body through passive transport. However, some solutes are concentrated in several compartments, such as the cytoplasm of red blood cells, which have a potassium ion concentration that is 30 times greater than that of blood plasma. This causes a chemical imbalance, because it needs active transport which requires energy to fight the concentration gradient to achieve osmotic balance.

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The difference in charge between hydrogen ions that are slightly positive and other hydrogen ions that are slightly negative results in hydrogen bonds, which are electrostatic forces that attract.

The partial positive charge of the hydrogen atoms in some polar molecules that contain hydrogen atoms is drawn to the partial negative charge of an atom in another molecule close by. It is known as a hydrogen bond to describe this attraction.

Bonding of hydrogen. Not a covalent link to a hydrogen atom, hydrogen bonding is a unique kind of dipole-dipole interaction between molecules. It comes about as a result of the attraction between two extremely electronegative atoms, such as N, O, or F, and a hydrogen atom that is covalently bound to one of them.

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For most bases, sulfuric acid reacts as an acid to form the equivalent sulfate.

Hydrochloric acid is a crucial commodity ingredient utilized largely in the synthesis of phosphate in contemporary industry. Metal makers use it in huge amounts because it is efficient at removing corrosion from iron and steel. The substance sulfuric acid is highly dangerous.

Strong acid that is water soluble is strong acid (H2SO4, oil of vitriol). Among the most widely manufactured compounds, it is employed in the creation of fertilizers, the treatment of ores, and the refinement of crude oil.

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The phosphate of the incoming ribonucleotide is added to the oxygen on   the fifth carbon.

Genetic material is characteristic information of living things that can be passed on to their offspring. The characteristic information of living things is contained in the cell.

Nucleic acid is the genetic material of the cell nucleus which functions to control cell activity and carry genetic information.  Nucleic acids are nucleotide polymers whose hydrolysis produces phosphates, deoxyribose or ribose pentose sugars, and nitrogenous bases. The pentose sugar that makes up the nucleotide has the form of furanose, the phosphate group is bonded to the 5' carbon of the pentose sugar through an esterification mechanism so that it is called a phosphoester bond, while the heterocyclic nitrogenous bases that make up the nucleotides are purines and pyrimidines.

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Answer:

Viscosity of a solution affects needle selection because it determines the resistance of the fluid to flow. Higher viscosity solutions are thicker and have a higher resistance to flow, while lower viscosity solutions flow more easily.

Explanation:

Covalent bonds only hybrid orbitals. The correct option is C

Covalent bond is formed by the sharing of electrons between two atoms. Single, double, and triple covalent bonds refer to the number of electrons that are shared between the atoms.

In single covalent bonds, one electron from each of the participating atoms is shared, while in double covalent bonds, two electrons from each of the atoms are shared, and in triple covalent bonds three electrons are shared.

To form these bonds the atomic orbitals of the participating atoms must overlap to form hybrid orbitals. Hybrid orbitals are created by combining two or more atomic orbitals to create new orbitals with different shapes and energies. These hybrid orbitals are used to form the covalent bonds.

Therefore, covalent bonds contained only hybrid orbitals.

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It is not possible to determine if a penny is made of pure copper based solely on its mass and volume.

The composition of pennies has changed over time, and currently, U.S. pennies are made of a composition of 97.5% zinc and 2.5% copper. The mass and volume of a penny are not sufficient to determine the exact composition of the metal.

In order to determine the composition of a penny, more extensive analysis, such as chemical analysis or X-ray diffraction, would be needed. These methods can identify the elements present in the penny and their relative amounts, which would allow for a more accurate determination of the composition.

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It is a nonmembranous structure made up of two centrioles that resemble rods. During cell division, it aids in the distribution of chromosomes to new cells. the centrosome's composition and purpose.

The division of cells is an issue for the centriole. As the cell cycle progresses, they aid in the creation of the spindle fibers that divide the chromosomes.

Organelles, active tiny structures that perform certain tasks for the cell, are abundant in cells. All multicellular species share several organelles, however the centriole is one cell component that is nearly uniquely present in animal cells.

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The pH of a solution is a measure of its acidity or basicity. If the pH in beaker a is 5.20, the pH in beaker B is 4.20.

The pH of a solution is a measure of its acidity or basicity, which is calculated based on the concentration of hydrogen ions (H+) present in the solution. A pH value of 7 represents neutral, whereas values below 7 indicate an acidic solution, and values above 7 indicate a basic or alkaline solution. In the two molecular scenes provided, the concentration of H3O (purple) ions is shown in solutions of the same volume. In beaker A, the concentration of H3O ions is higher, resulting in a lower concentration of hydrogen ions (H+) in the solution and thus a higher pH of 5.20. In contrast, the concentration of H3O ions in beaker B is lower, resulting in a higher concentration of hydrogen ions (H+) and a lower pH of 4.20.

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Answer:

Explanation:

Potassium hydroxide fully ionizes when dissolved in water according to the following equation:

K

O

H

→

K

+

+

O

H

−

Now, let's find the relationship between

K

O

H

and

O

H

−

1

  :  

1

ratio

⇒

[

K

O

H

]

=

[

O

H

−

]

=

6.7

×

10

−

3

M

In any aqueous solution,

[

H

3

O

+

]

and

[

O

H

−

]

must satisfy the following condition:

[

H

3

O

+

]

[

O

H

−

]

=

K

w

[

H

3

O

+

]

=

K

w

[

O

H

−

]

[

H

3

O

+

]

=

1.0

×

10

−

14

6.7

×

10

−

3

[

H

3

O

+

]

=

1.5

×

10

−

12

M

p

H

=

−

log

[

H

3

O

+

]

p

H

=

−

log

[

1.5

×

10

−

12

]

p

H

=

11.83

When two or more chemical substances (elements or compounds) are mixed together, a heterogeneous mixture is one in which the various components are easily distinguishable visually and physically.

A mixture is a substance that can be physically separated from two or more other substances. There are numerous varieties of mixes.

Homogeneous mixtures are those in which the composition is constant throughout. The mixture's components are difficult to separate. Solutions are another name for these kinds of mixes. A nice illustration of a homogenous combination is a cup of coffee.

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Answer:

D

Explanation:

NO is the molecule nitrogen monoxide while No is the atomic symbol for the element nobelium

Arnold beckman invented and sold one of the first portable Acidimeter. Later, popularly known as Electronic pH meter.

Potentiometric pH metres determine the appropriate pH value from the voltage measured among two electrodes and show it. They consist of a conventional electronic amplifier, two electrodes, or a combination electrode, and a pH-calibrated display of some kind.

Potassium chloride supplies chloride ions to the electrode. Being pH-neutral is a benefit of using these for this purpose. KCl solutions with amounts ranging from 3 molar to saturated are routinely used with pH metres.

You will need pH7 and pH4 buffer solutions to adjust a pH metre. When working with a pH metre, you want to make absolutely sure that it displays the correct measurement, thus these buffer solutions offer you in doing that.

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Since every element's electrons in an interval have roughly equal amounts of energy, the nucleus has more "pulling strength" as the number of protons increases.

Subatomic particles known as electrons have an elementary force of magnitude -1. The magnitude of an electron's charge is equivalent to that of a proton. The number of both protons and electrons in electrically neutral atoms and molecules must thus be equal.

In contrast to electrons, neutrons and protons are comprised of quarks. We believe that quarks and electron are basic particles that are not composed of lesser subatomic particles.

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According to the balanced chemical equation of the reaction between Fe and O₂ to give Fe₂O₃, 3 moles of O₂ gives 2 moles of Fe₂O₃. Then, 31 moles of O₂ gives 22.6 moles of Fe₂O₃.

Fe₂O₃ or ferric oxide is an oxide of the metal iron formed by the reaction between Fe metal with atmospheric oxygen or water. The balanced chemical equation of the reaction is given below:

[tex]\rm4 Fe + 3O_{2} \rightarrow 2 Fe_{2}O_{3}[/tex]

As per this balanced reaction, 3 moles of oxygen gas gives 2 moles of ferric oxide. Then number mole of Fe₂O₃ produced by 31 moles of oxygen gas is:

no.of moles of Fe₂O₃ = (31 moles ×2 moles)/ 3moles = 22.6 moles.

Therefore, the number of moles of Fe₂O₃ from 31 moles of O₂ is 22.6 moles.

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One NaOH molecule is made of one sodium atom , one hydrogen atom and one oxygen atoms. Hence, there are 3 atoms in one molecule of NaOH. Hence, there are 12 atoms in 4 molecules of NaOH.

NaOH, or sodium hydroxide is an ionic compound, formed by the sodium metal reaction with water or with the other hydroxides. Here, the sodium metal donates one electron to the OH- group.

A compound is made of a number of molecules. One mole of a compound contains Avogadro number of molecules. The mass of one mole of a compound is called its molar mass.

One NaOH molecule is made of one sodium atom , one hydrogen atom and one oxygen atoms. Hence, there are 3 atoms in one molecule of NaOH. Hence, there are 12 atoms in 4 molecules of NaOH.

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For something like the electrophilic aromatic substitution-based chlorination of benzene, several chemicals chlorine as well as fecl3 are necessary.

Poisoning can be lethal due to the way that hydrocarbons affect how the body's cells function. Being introduced to benzene might also have an impact on the stem cells' capacity to produce red blood cells, as well as the white blood cells that make up the immune framework. Because it is lipid solvent, formaldehyde can cause irritation and also degrease it, especially upon prolonged or regular contact with the substance.

Benzene is a standard industrial chemical. Benzene, a key ingredient in gasoline, can be found in crude oil. It is used in the production of plastics, monomers, textiles, rubber lubricants, dyes, detergents, medicines, and pesticides. Benzene is a naturally occurring product of earthquakes and wildfires.

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Answer:

32 gm O

Explanation:

there are 16 gm of O in each 18 gm of water ....the other two grams are H

so there would be 32 gm of oxygen in 36 gm water

Chemicals are not supposed to be poured down the drain.

Chemicals should not be poured down the drain. This can cause harm to the plumbing system, sewage treatment plants, and the environment. Dispose of household chemicals properly by taking them to a designated recycling center or household hazardous waste collection event.

Thus the action that have been undertaken by Thomas and Trenton  is quite wrong since the chemicals that they have poured down the drain could lead to an environmental hazard.

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Iodine atoms are larger than those of the other halogens listed, making them the biggest molecule. It will have the best ability to engage in dispersion forces because it is the largest molecule.

Long chain length molecules have stronger London Dispersion Forces. Larger molecules have more places to attract other molecules, which is why this is the case. The C9H20 has a larger dispersion force than all the other alkanes on the list because of this.

The quantity of electrons in an atom or molecule tends to increase the strength of dispersion forces. The composition C8H18 will have the strongest dispersion forces since it contains a lot more electrons than any of the other compounds.

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The vapor pressure of pure water at 85°C is 434 torr, the vapor pressure of the solution will also be 434 torr.

The vapor pressure of a solution depends on the mole fraction of solute in the solution. If the solution contains a solute that does not participate in the vapor pressure, then the vapor pressure of the solution will be equal to the vapor pressure of pure water at the same temperature.

If the solution contains 263 mL of water, the number of moles of water can be calculated as follows:

mass of water = 263 mL * density of water = 263 mL * 1 g/mL = 263 g

number of moles of water = mass of water / molar mass of water = 263 g / 18.015 g/mol = 14.54 mol

Since the vapor pressure of pure water at 85°C is 434 torr, the vapor pressure of the solution will also be 434 torr.

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A. CH2Cl2 in Benzene (C6H6) > B. Methanol (CH3OH) in water > C. KCl in water are the solute-solvent interactions with the strongest to weakest strengths, respectively.

Intermolecular forces play a significant role in a solute's ability to dissolve in a solvent. The solubility increases with the strength of the attraction between the molecules of the solute and the solvent. Polar solvents, for instance, have a tendency to dissolve polar liquids.

Greater solubility is associated with strong solute-solvent interactions, whereas lesser solubility is associated with weak solute-solvent attractions. Conversely, non-polar solutes typically dissolve better in non-polar solvents, whereas polar solutes typically dissolve better in polar solvents.

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