chemicals that accumulate in soil and water as a result of car emissions, improperly disposed waste, industry, and agriculture are known as

An ammonia buffer solution contains 0.18 m NH₄ and 0.27 m NH₃ the pka of ammonium is 9.24  and the pH of the buffer is  9.41

pH means a measure of how acidic or basic a substances or solution

Here given data is

Pka of NH₄  = 9.24

Concentration of NH₄ = 0.18 M

Concentration of NH₃ = 0.27 M

Then we have to calculate pH =?

The pH of buffer solution can obtain by using the Henderson Hassel Bach equation

pH = Pka + log [base]/[acid]

pH =  9.24 + log [NH₃]/[NH₄]

pH = 9.24 + log [0.27 M[/[ 0.18 M]

pH = 9.24 + log [1.5]

pH =  9.24 + 0.176

pH = 9.41

pH of the buffer is 9.41

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Sleet ,freezing of raindrops, snowflakes Precipitation

are 4 non examples of condensation .

What is condensation ?

Condensation, the separation of a liquid or solid from a vapor, generally occurs on surfaces that are cooler than the adjacent gas. A substance condenses when the pressure exerted by that vapor exceeds the vapor pressure of the substance's liquid or solid phase at the temperature of the surface on which condensation is occurring. As the steam condenses, heat is released. If this heat is not removed, the surface temperature will rise until it matches the surrounding steam.

If the air does not contain small particles, so-called aerosols, condensation will only occur if the air is extremely supersaturated with water vapor.

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An generally pro of HBr results in a molecule called halohydrin in this process. The oxygen carrier in the epoxide will be protonated by the hydrogen, and then the bromide ion will attack the more.

Stereochemistry is the study of a material's four structural elements. The location of the particle's electrons in 3 dimensions is the only structural distinction between the enantiomers known as cis and trans isomers. There may be differences in the physicochemical characteristics of these stereoisomers.

Chemists can determine the connections between several molecules consisting of the same atoms by using stereochemistry. They can also research how these linkages affect the physical and biological characteristics that molecules possess.

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2,726.28 mL solution of propyl alcohol is required to make a 9.17% (v/v) aqueous solution in a 250. ml.

A solution's volume-by-volume percent concentration,

9.17% v/v is a measure of how many milliliters of solute it contains in 100 mL of solution.

In this case,  

9.17% v/v solution will contain -

9.17 mL of solute for every 100 mL of solution.

This means that in order to have propyl alcohol required to make a 9.17% (v/v) aqueous solution in 250 ml  of solute, you need to have

250 mL solute× 100 mL solution/ 9.17mL solute

=2,726.28 mL solution.

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amount of bromoacetic acid = 22.2 grams

amountof sodium bromoacetate = 6.47 grams

Total concentration = 0.200 M

[CH2BrCOOH] + [CH2BrCOONa] = 0.200 M     ...(1)

Ka = 2.00 x 10-3

pKa = -log(Ka)

pKa = -log(2.00 x 10-3)

pKa = 2.70

According to Henderson - Hasselbalch equation,

pH = pKa + log([conjugate base] / [weak acid])

2.100 = 2.70 + log([CH2BrCOONa] / [CH2BrCOOH])

log([CH2BrCOONa] / [CH2BrCOOH]) = 2.100 - 2.70

log([CH2BrCOONa] / [CH2BrCOOH]) = -0.60

[CH2BrCOONa] / [CH2BrCOOH] = 10-0.60

[CH2BrCOONa] / [CH2BrCOOH] = 0.252      ...(2)

Solving equations (1) and (2)

[CH2BrCOOH] = 0.160 M

[CH2BrCOONa] = 0.040 M

moles CH2BrCOONa = (molarity CH2BrCOONa) * (volume of buffer in Liter)

moles CH2BrCOONa = (0.040 M) * (1.00 L)

moles CH2BrCOONa = 0.040 mol

mass CH2BrCOONa = (moles CH2BrCOONa) * (molar mass CH2BrCOONa)

mass CH2BrCOONa = (0.040 mol) * (160.93 g/mol)

mass CH2BrCOONa = 6.47 g

moles CH2BrCOOH = (molarity CH2BrCOOH) * (volume of buffer in Liter)

moles CH2BrCOOH = (0.160 M) * (1.00 L)

moles CH2BrCOOH = 0.160 mol

mass CH2BrCOOH = (moles CH2BrCOOH) * (molar mass CH2BrCOOH)

mass CH2BrCOOH = (0.160 mol) * (138.95 g/mol)

mass CH2BrCOONa = 22.2 g

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The volume of 2.00 M MgSO₄ is 20.0 mL.

Parameter

If we added water to the first solution, the concentration changed but the mole in that solution didn't change.

Formula between mole, volume, and concentration (molarity)

[tex]M = \frac{n}{V}[/tex]

n = M×V

n₁=n₂

M₁×V₁ = M₂×V₂

2.000×V₁ = 0.400×100.0

2.000×V₁ = 40.0

[tex]V_1 = \frac{40.0}{2.000}[/tex]

V₁ = 20.0 mL

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The pH at the equivalence point will be 4.028

Volume of NaOCl = 20.00 ml

Volume of HCl = 28.30 ml

Molarity of HCl = 0.50 M

Ka = 3.0 × 10⁻⁸ (missing in question)

pH of solution at eq. point = ?

Write the chemical equation

    NaOCl + HCl → HOCl + NaCl

Initial concentration of reactants and products are as:

    NaOCl = 20 × M

    HCl = 28.3 × 0.50

    HOCl = 0

    NaCl = 0

Equivalence point concentration of reactants and products are as:

    NaOCl = 0

    HCl = 0

    HOCl = 28.3 × 0.5

    NaCl = 28.3 × 0.5

As NaCl is a neutral salt so we take the concentration of HOCl

    [HOCl] = 28.3 ml × 0.5 M / 48.3 ml (total volume)

    [HOCl] = 0.2929 M

Now calculate the pH

    pH = 1/2 [pKa - log C]

    pH = 1/2 [ (8 - log 3) - log 0.2929]

    pH = 4.028

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Answer:

What happens when carbon dioxide increases and oxygen decreases? Increasing carbon dioxide and decreasing oxygen make it harder for deep-sea animals to ‘breathe’ About one third of the carbon dioxide that humans produce by burning fossil fuels is being absorbed by the world’s oceans, gradually causing seawater to become more acidic.

Explanation:

Hope this helps

Increasing the concentration of N2(g) will causes the equilibrium to shift to the right.

Chemical equilibria can be shifted by changing the conditions that the system experiences. We say that we "stress" the equilibrium. When we stress the equilibrium, the chemical reaction is no longer at equilibrium, and the reaction starts to move back toward equilibrium in such a way as to decrease the stress.

According to Le Chatelier's principle, a change in one of the variables that describe a system at equilibrium produces a shift in the position of the equilibrium that counteracts the effect of this change.

In the synthesis of ammonia the equilibrium will shift to right only when we increase the concentration of N2(g). Because increasing nitrogen gas causes more ammonia to be produced, so the concentration of ammonia must increase.

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High explosive elements should be placed on the right side of the periodic table and lower explosive elements should be placed on the left side.

We will organize the periodic table starting from least explosive to high explosive just like the arrangement is done in the modern periodic table in which elements having lower atomic numbers are present on the left side of the periodic table whereas the elements having higher atomic numbers are placed on the right side of the periodic table.

What is the periodic table?

The periodic table is the tabular arrangement of all the chemical elements on the basis of their respective atomic numbers.

Why the periodic table is important?

The periodic table of elements puts all the known elements into groups with similar properties.

Thus, lower explosive elements are placed on the left and high explosive elements are placed on the right of the periodic table.

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solid(particles are appropriately packed)  in solids there is no distance between the constituent particles

liquid(particles are closely packed).

gas(particles move freely) .

In a gas, the particles are evenly spaced out and not in any particular order. There is no regular arrangement of liquid next to one another. solids are regularly arranged and closely packed.

We can infer from the diagram that there is no space between the individual particles that make up solids. Without any intermolecular voids between the individual molecules, it is a completely packed structure.

In contrast, the particles in liquids are more closely packed than those in gaseous fluids, albeit they are more loosely packed than those in solids. We can now observe that there is a significant intermolecular gap between the constituent particles of gases. They are packed more flimsily than

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The molarity of potassium acetate in a solution made by adding 50 ml of 2.00 m nitric acid with enough water to make 450.0 ml of solution is 0.22 mol/L.

A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm³ in SI units, is the most often used unit denoting molarity in chemistry.

We know that, M₁V₁ = M₂V₂

Here, M₁ =?

          V₁ = 450 mL

          M₂ = 2 M

          V₂ = 50 mL

M₁ × 450 = 2 × 50

M₁ = 100/450

M₁ = 0.22 mol / L

Thus, we need 0.22 mol/L of potassium acetate in a solution made by adding 50 ml of 2.00 m nitric acid with enough water to make 450.0 ml of solution.

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The mass of the products form when baking soda decomposes is 25.00 grams

We can determine the mass of the products formed by simply observing the law of conservation matter (mass). Details below

The law of conservation of matter states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

Thus, for every balanced chemical equation, total mass of reactants must equal to the total mass of the product obtained.

With the above information, we can detertmine the mass of the products obtained as follow:

2NaHCO₃ → Na₂CO₃ + H₂O + CO₂

Mass of reactant = Mass of product

Mass of NaHCO₃ = Mass of (Na₂CO₃ + H₂O + CO₂)

25.00 g = 25.00 g

Thus, the mass of the products is 25.00 g

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So an atom with a radius of 50 kilometers would be required for a nucleus that was 1 meter in size.

The nucleus is the center of the cell and contains the DNA and other structures that contain the genetic material (such as growth and metabolism). Inside the nucleus, tiny structures known as nucleoli are frequently seen. The gel-like structure within which nuclear components are hung is known as the cell nucleus.

When one look at a photograph of a cell, one of the parts that stands out the most is the nucleus. The nucleus, located at the center of the cell, is home to all of the chromosome, which are responsible for encoding the genetic material. The nuclear envelope, nucleolus, nuclear matrix, nucleosome, and nucleolus are some of the several structures that make up the nucleus.

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Ozone has dipole moment even though all the atoms  are the same because of the presence of lone pair on the central oxygen atom.

The dipole moment of any molecules is the product of the charge on the either side of the molecule and the distance between them.

As we know, Ozone contains 3 oxygen atoms.

The presence of lone pair on the central oxygen atom bends down the molecule of ozone which indeed give result to the a bent symmetry of ozone molecule. As we know, if a molecule is bent then it is very lightly to have some dipole moment.

Even though there are all the items of same kind but the charge on all the three atoms is different which gives contribution in the formation of the dipole moment. So, we can conclude here that the small dipole moment in ozone molecule is observed because of the presence of the lone pair and symmetry of the molecule.

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so, to calculate the molar of the monoprotic weak acid ;

first, we write the reactions

HA +NaOH → NaH +H20

42.0ml NaOH ( 1l NaOH / 1000 ml NaoH ) (0.250 m/ 1l NaOH) (1 mol HA/ 1 mol NaOH)

0.0105 moles HA

now, we calculate the molar mass

molar mass= mass/ moles

                   = 0.483 grams/ 0.0105 moles

                   = 46 grams/moles

the molar mass of the monoprotic weak acid is 46grams/moles

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The number of mole of air in the ball, given that the volume of the ball is 5.2 litres is 0.13 mole (Option A)

We'll begin by listing out the given parameters from the question. This is given below:

From the above parameters, we can obtain the number of mole as follow

PV = nRT

61 × 5.2 = n × 8.314 × 305

317.2 = n × 2535.77

Divide both sides by 2535.77

n = 317.2 / 2535.77

n = 0.13 mole

Thus, the number of mole is 0.13 mole (Option A)

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Answer:

to drink

Explanation:

we all need water to drink without it we'll all be dead

Answer:

You might get nervous and anxiety about meeting up in society

When performing a presumptive blood test with Hemastix, the reason why it necessary to test an unstained area close to the bloodstain under examination as a control is that the likelihood that there is presence of blood, and thus need confirmatory test in lab to know if it is actually blood.

Hemastix reagent strips were initially created for the purpose of detecting blood in urine. It has been determined that this quick and simple test is useful as a presumptive test for the presence of blood.

Note that the presence of a chemical in a sample can be determined or confirmed using a presumptive test, which is a qualitative study. These decisions are typically made following a chemical reaction that results in the production of a certain color. A false positive occurs when a different chemical reacts similarly and yields the desired outcome.

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The primary difference between the oxidation of glucose to CO₂ by glycolysis and the critic acid cycle vs by the pentose phosphate is the glycolysis occurs in cytosol. to CO₂ is release of CO₂ is in mitochondria and in the pentose phosphate CO₂ is generated in the cytosol.

When the glucose oxidation takes place  by glycolysis and the citric acid cycle , the total catabolism will occur. The energy is released and this energy is trapped in ATP. in this glucose is catabolizes. in pentose phosphate  CO₂   is generated in the cytosol.

Thus, The primary difference between the oxidation of glucose to CO₂ by glycolysis and the critic acid cycle vs by the pentose phosphate is the glycolysis occurs in cytosol. to CO₂ is release of CO₂ is in mitochondria and in the pentose phosphate CO₂ is generated in the cytosol.

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The final equilibrium temperature of the mixture of lead, silver, and water is 24.65°C. The result is obtained by using the Black's Principle.

The Black's Principle states that heat released by a higher-temperature object is equal to the heat absorbed by a lower-temperature object. It can be expressed as

Q release = Q absorbs

Where

The mass of lead is 125 g at 85°C, the mass of silver is 320 g at 34°C, and the mass of water is 0.5 kg at 22°C. All of them are mixed, so that the temperature of the lead and silver will fall and otherwise the temperature of water will rise.

The equation of the heat energy with the temperature change is

Q = m × c × ΔT

Where

The data shows that:

The equilibrium temperature is

Q release = Q absorbs

(m × c × ΔT)lead + (m × c × ΔT)silver = (m × c × ΔT)water

(0.125 × 128 × (85-T)) + (0.320 × 234 × (34-T)) = (0.500 × 4,186 × (T-22))

(16 × (85-T)) + (74.88 × (34-T)) = (2,100 × (T-22))

1,360 - 16T + 2,545.92 - 74.88T = 46,200 - 2,100T

2,190.88T = 50,105.92

T = 24.65°C

Hence, the final equilibrium temperature of the mixture is 24.65°C.

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Among elements that are involved in a chemical reaction, one that would be most likely to form a cation is : potassium (K)

In the periodic table, potassium is one of the alkali metals which has a single valence electron in the outer electron shell. This valence electron is easily removed to create an ion with a positive charge that is a cation.

Halogens always form anions whereas alkali metals and alkaline earth metals form cations.

Cl- is an example of anion as Cl- atom is a chlorine atom that has gained one electron and has a negative charge of -1 since it has a full outer shell. A negatively charged ion fluorine is an anion.

Nitrogen is neither a cation nor an anion as it falls in the category of atom and atoms are electrically neutral.

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The type of protein molecules that is been used to digest food in  the organism are:  

The organelle where energy from nutrients is released is the Mitochondria.

One  inference that can be made concerning a cell that has many of these organelles is that te utilization of the energy is balanced.

The  organelle where energy from nutrients is released is the Mitochondria , this organelles can be described as the one that look tiny  inside cells  and this is very essential in the cell because it helps in the p[roces of releasing energy from food.

It should be noted that this process is been refferd to as process of cellular respiration and this is the reason why the biologist do referred to  mitochondria as the powerhouses of the cell because it involves the use of energy.

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I would have to go with D

Hope this helps

Answer:

just give the other person brainliest

Explanation:

When you are working diligently in the chemistry lab, when suddenly a small explosion occurs in the rear of the room , immediately and automatically capturing your attention, this is an example of Reflexive attention.

Reflexive attention is essentially a semi-autonomous decision making system.

The brain regulates vital body functions such as heartbeat, movements and learning processes. Also, the brain controls the psychological processes such as memory, wakefulness, and attention.

Attention is categorized into two groups; voluntary and reflexive.

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Answer: 2

Explanation: For the equation to be balanced, the elements or compounds from the reactant and product sides must be equal.

Everything else was equal except the Na and Cl which on the reactant side it had 2 molecules each and on the product side 1 molecule.  

All you have to do is add 2 Infront of NaCl on the product side to make the reaction balance.

Valence electrons in CO₂ = 16

Bonded electrons in CO₂ = 4 electrons of carbon and 2 electrons of each oxygen atom

Lone pairs of electrons in CO₂ = 2 l0ne pair of electrons on each oxygen atom

Single bonds in CO₂ = None

A Lewis structure, also known as, Lewis dot structure, electron dot structure, is a diagram showing the bonds between the atoms of a molecule and the lone pairs of electrons present within the molecule.

Carbon dioxide is a colorless, odorless, non-flammable gas produced when carbon is burned. The ratio of carbon to oxygen in the  CO₂ molecule is 1:2. Two double bonds join the carbon and oxygen atoms in the Lewis structure. There are two oxygen atoms at each end where they share electrons and form a bond with the central carbon atom. A Lewis structure diagram shows the number of valence electrons available for bond formation within an atom. You can also visualize the behavior of valence electrons in molecules and determine if lone pairs are present.

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Alpha particles are the only radioactive particle that could have been used in the Rutherford gold foil experiment because they are produced naturally by radioactive nuclides that are alpha emitters and so a steady supply was easy to obtain.

As alpha particles do not travel very far from their radioactive source. They cannot pass through a piece of paper, clothes, or even the layer of dead cells which normally protects the skin.

Rutherford used alpha particles in his gold foil experiment in part because his previous research on radioactive decay discovered alpha particles. He wanted to test how alpha particles, which are positively charged, would react with various forms of matter.

Therefore Rutherford uses alpha particles in the Rutherford gold foil experiment.

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The total translational kinetic energy of 17 moles of an ideal gas is 198,242  j .  the gas temperature in kelvin is 937 K.

Given  that :

total translational kinetic energy = 198242 J

moles = 17 mol = 17 × 6.023 × 10²³

Total kinetic energy =  ( 3/2 KT ) × no. molecules

   198242  = ( 3/2) ( 1.38 × 10⁻²³ ) T × 17 × 6.023 × 10²³

T = 198242  / 211.84

T = 937 K

Thus, The total translational kinetic energy of 17 moles of an ideal gas is 198,242  j .  the gas temperature in kelvin is 937 K.

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