How many protons are there in a neutral, stable Hydrogen atom that makes up 99.985% of the element?

A. 1

B.2

C.3

D.4

E.0

a. To calculate the pH of the solution, we need to first calculate the concentration of H+ ions. Since HNO3 completely ionizes in water, the concentration of H+ ions will be equal to the concentration of HNO3.

Concentration of HNO3 = 25 mg/L / (63.01 g/mol) = 0.000397 M

Concentration of H+ ions = 0.000397 M

pH = -log[H+] = -log(0.000397) = 3.40

Therefore, the pH of the solution is 3.40.

b. To calculate the nitrate concentration, we simply need to convert the concentration of HNO3 to the concentration of NO3- ions.

Concentration of NO3- ions = 0.000397 M = 0.000397 mol/L * (62.004 g/mol) = 24.6 mg/L

Concentration of NO3- ions = 0.000397 M = 0.397 mM

Therefore, the nitrate concentration is 24.6 mg/L and 0.397 mM.

c. To calculate the nitrate-nitrogen concentration, we need to consider only the nitrogen part of the nitrate ion. The molecular weight of nitrogen is 14.007 g/mol.

Concentration of NO3-N = 0.000397 mol/L * (14.007 g/mol) = 5.56 mg/L

Concentration of NO3-N = 0.000397 M * (14.007 g/mol) / (14.007 g/mol) = 0.397 mM

Therefore, the nitrate-nitrogen concentration is 5.56 mg/L and 0.397 mM.

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Answer:

Cl⁻ Or A

Explanation:

Answer:

1) 70

2) conduction

3) The ground absorbs the solar radiation and

releases it throughout the later afternoon.

4) transpiration

5) convection

6) cumulonimbus

7) reflectivity of Earth’s surface

8) As temperature increases, air pressure

increases.

9) thermosphere

10) convection cells, pressure belts, and the

Coriolis effect

11) radiation

12) pollen

13) scattering

14) thermosphere

15) The different types of clouds are:

cumulus: Cumulus clouds are clouds which have flat bases and are often described as "puffy", "cotton-like" or "fluffy" in appearance. Their name derives from the Latin cumulo-, meaning heap or pile.

cirrus: Cirrus is a genus of atmospheric cloud generally characterized by thin, wispy strands, that typically appear white or light grey. The name is derived from the Latin word cirrus, meaning 'ringlet' or 'curling lock of hair'. Such a cloud can form at any altitude between 5,000 and 13,700 m above sea level.

stratus: Stratus clouds are low-level clouds characterized by horizontal layering with a uniform base, as opposed to convective or cumuliform clouds that are formed by rising thermals.

nimbus: Nimbostratus clouds are dark, grey, featureless layers of cloud, thick enough to block out the Sun and produce persistent rain. Height of base: 2,000 - 10,000 ft. Shape: Bands or areas of individual cells. Latin: nimbus - rainy cloud; stratus - flattened or spread out. Precipitation: Continuous rain or snow likely.

16) the tradewinds

17) the location’s latitude

18) Cirrus clouds

19) the ozone layer

20) Global winds are created by both the spin of

the Earth (Coriolis effect) and the differences

in temperature between the equator and

the polar areas. These winds are often

grouped together as trade winds, easterlies,

and westerlies.

21) nitrogen

22) the Miller-Urey hypothesis

the Oparin-Haldane hypothesis

23) ammonia gas

24) cumulus

25) It determines the mass of water in a volume of air

Explanation:

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What were Lamarck's ideas about evolution and Why were those ideas incorrect?

→ These and other examples show that Lamarck's theory does not explain how life formed and became the way it is. The other way that Lamarck's theory has been proven wrong is the study of genetics. Darwin knew that traits are passed on, but he never understood how they are passed on.

The molar mass of calcium carbonate is 100 grams . This is determined by Stoichiometry.

The molar mass (M) of a chemical compound is defined in chemistry as the ratio of mass to substance (measured in moles) of any sample of said compound. The molar mass of a substance is a bulk property, not a molecular property. The molar mass is an average of many instances of the compound, which often vary in mass due to isotopes present. The molar mass is most commonly calculated from standard atomic weights and is thus a terrestrial average and a function of the relative abundance of the constituent atoms on Earth. For bulk quantities, the molar mass is appropriate for converting between the mass of a substance and the amount of a substance.

In Calcium carbonate

mass of calcium = 40 g

mass of carbon = 12 g

mass of three oxygen atoms = 48 g

adding all molar mass = 100 g

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The wavelength of the single photon of UV-A electromagnetic radiation is 3.2×10⁻⁵ cm (2nd option)

We'll begin by obtaining the frequency of the single photon of UV-A. Details below:

Energy (E) = Planck's constant (h) × frequency (f)

E = hf

6.2×10⁻¹⁹ = 6.626×10⁻³⁴ × f

Divide both sides by 6.626×10⁻³⁴

f = 6.2×10⁻¹⁹ / 6.626×10⁻³⁴

f = 9.36×10¹⁴ Hz

Finally, we shall determine the wavelength of the single photon of UV-A. Details below:

Velocity (v) = wavelength (λ) × frequency (f)

3×10⁸ = wavelength × 9.36×10¹⁴

Divide both sides by 9.36×10¹⁴

λ = 3×10⁸ / 9.36×10¹⁴

λ = 3.2×10⁻⁷ m

Multiply by 100 to express in meter (m)

λ = 3.2×10⁻⁷ × 100

λ = 3.2×10⁻⁵ cm

Thus, the wavelength is 3.2×10⁻⁵ cm (2nd option)

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The amount of aluminium bromide actually obtained through the experiment, considering a percent yield of 95% and starting with 4.00 moles of aluminium, is 3.80 moles.

We must take into account both the initial amount of aluminium and the % yield in order to calculate the amount of aluminium bromide that was really acquired from the experiment.

Given: % yield equals 95%

Aluminum initial moles = 4.00 moles

We may use the following formula to get the real yield of aluminium bromide:

Real yield equals % yield multiplied by the theoretical yield

According to the balanced chemical equation and stoichiometry, theoretical yield refers to the maximum quantity of aluminium bromide that can be produced.

The chemical reaction between aluminium and bromine has the following balanced chemical equation:

2 Al3 = 2 Al3 + 3 Br2

We may deduce from the equation that the stoichiometric ratio of aluminium to aluminium bromide is 2:1, or just 1:1. This indicates that one mole of aluminium bromide is created for every mole of aluminium that reacts.

Theoretically, 4.00 moles of aluminium bromide should be produced given that we started with 4.00 moles of aluminium.

We can now determine the real yield:

Real yield equals 95% times 4 moles, or 0.95 times 4 moles, or 3.80 moles.

As a result, starting with 4.00 moles of aluminium and using a 95% per cent yield, the actual quantity of aluminium bromide achieved by the experiment is 3.80 moles.

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The cellular organelle that is most affected by CO poisoning is mitochondria (option B).

Mitochondria is a cellular organelle found in eukaryotic cells and responsible for the production of energy in form of ATP.

Carbon monoxide (CO) is a common environmental pollutant released when fossil fuels are burned. The major target of this pollutant is the mitochondria.

Carbon monoxide (CO) binds to cytochrome oxidase of the electron transport chain in the mitochondria, thereby, blocking oxidative phosphorylation and ATP production. As ATP declines, there is no energy to drive the breathing muscles.

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Approximately 12.45 grams of solid silver chromate will precipitate when 150 mL of 0.500 M silver nitrate solution is added to excess potassium chromate.

To determine the number of moles of AgNO3 present in 150 mL of a 0.500 M AgNO3 solution, we can use the formula:

moles = concentration × volume

Given:

Concentration of AgNO3 solution = 0.500 M

Volume of AgNO3 solution = 150 mL

First, we need to convert the volume from milliliters (mL) to liters (L) since the concentration is given in moles per liter (M).

1 L = 1000 mL

Therefore, the volume of the AgNO3 solution in liters is:

150 mL × (1 L / 1000 mL) = 0.150 L

Now we can calculate the moles of AgNO3 using the formula:

moles = concentration × volume

moles = 0.500 M × 0.150 L

moles = 0.075 mol

So, there are 0.075 moles of AgNO3 present in 150 mL of the 0.500 M AgNO3 solution.

Now, let's proceed to determine how many grams of solid silver chromate (Ag2CrO4) will precipitate when the AgNO3 solution reacts with excess potassium chromate (K2CrO4).

From the balanced chemical equation:

2AgNO3(aq) + K2CrO4(aq) → Ag2CrO4(s) + 2KNO3(aq)

We can see that the molar ratio between AgNO3 and Ag2CrO4 is 2:1. Therefore, for every 2 moles of AgNO3, we will form 1 mole of Ag2CrO4.

Since we have 0.075 moles of AgNO3, we can calculate the moles of Ag2CrO4 formed:

moles of Ag2CrO4 = 0.075 mol / 2 = 0.0375 mol

To determine the mass of Ag2CrO4, we need to multiply the moles by its molar mass. The molar mass of Ag2CrO4 is calculated by summing the atomic masses of each element in the compound:

Ag2CrO4 = 2(Ag) + 1(Cr) + 4(O) = 2(107.87 g/mol) + 1(52.00 g/mol) + 4(16.00 g/mol) = 331.87 g/mol

mass of Ag2CrO4 = moles of Ag2CrO4 × molar mass of Ag2CrO4

mass of Ag2CrO4 = 0.0375 mol × 331.87 g/mol = 12.45 g

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The pair of atoms that is unlikely to form a compound are neon (Ne) and argon (Ar) (option D).

Compounds are substances that are formed by chemical bonding of two or more elements in definite proportions by mass.

Elements combine to form compounds by sharing, donating or gaining electrons. For example, metals donate electrons to nonmetals to form metallic or ionic bonds.

However, noble gases are elements that have a completely filled shells, hence, do not engage in chemical bonding. Examples of noble gases are argon, helium, neon etc.

Therefore, the pair of atoms that is unlikely to form a compound are neon (Ne) and argon (Ar).

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Answer:

Aluminum atoms are in 3.78 g of aluminum

02214076x10^23)8.4367659370640769254888x10^22 atoms, therefore there are 8.4367659370640769254888x10^22 atoms of Aluminum(Al) present in 3.78 grams of Aluminum(Al).

Explanation:

the benzoic acid/benzoate buffer ( ka = 6.5x10-5) has been measured to have a ph of 5.6. calculate the ratio of [c7h6o2] to [c7h5o2-]:- the ratio of [C7H6O2] to [C7H5O2-] in the benzoic acid/benzoate buffer is 1:25.1.

Given the information, we need to calculate the ratio of benzoic acid ([C7H6O2]) to benzoate ([C7H5O2-]) in the buffer solution.

1. First, we'll use the  Henderson-Hasselbalch equation, which is:

pH = pKa + log ([A-]/[HA])

In this case, pH = 5.6 and pKa = -log(Ka) = -log(6.5 x 10^-5)

2. Calculate the pKa:

pKa = -log(6.5 x 10^-5) ≈ 4.19

3. Now, plug the pH and pKa values into the Henderson-Hasselbalch equation:

5.6 = 4.19 + log ([C7H5O2-]/[C7H6O2])

4. Solve for the ratio ([C7H5O2-]/[C7H6O2]):

5.6 - 4.19 = log ([C7H5O2-]/[C7H6O2])

1.41 = log ([C7H5O2-]/[C7H6O2])

5. Use the antilog to solve for the ratio:

[C7H5O2-]/[C7H6O2] = 10^1.41 ≈ 25.5

So, the ratio of [C7H5O2-] to [C7H6O2] in the buffer solution is approximately 25.5.

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A mass of gas has a pressure of 450 kPa and temperature of 140°C. The pressure is doubled during a process but the volume remains unchanged.

In order to solve this problem, we need to apply Charles' Law: V1/T1 = V2/T2. Since the volume remains unchanged, we can simplify this to T1/P1 = T2/P2. T1 and P1 are the initial temperature and pressure, respectively. T2 is the unknown final temperature, and P2 is double the initial pressure (i.e., 2P1).

Substituting the given values:140 + 273 = 413 K450 kPa * (2) = 900 kPa413 K/450 kPa = T2/900 kPaT2 = (413 K / 450 kPa) * (900 kPa) = 756 KWe must then subtract 273 to convert from kelvin to Celsius. Therefore, T2 = 483°C, which is the new temperature.

In this case, the gas law to apply is Charles’ law which states that at a constant pressure, the volume of a fixed amount of gas is directly proportional to its absolute temperature. The general equation of Charles' law is V1/T1 = V2/T2, where V is the volume of the gas, T is the temperature, and the subscripts 1 and 2 denote initial and final states, respectively. For our question, since the volume remains unchanged, we can simplify this to T1/P1 = T2/P2. T1 and P1 are the initial temperature and pressure, respectively. T2 is the unknown final temperature, and P2 is double the initial pressure (i.e., 2P1).

Therefore, T2 = (T1 x P2)/P1. We can substitute the given values into the formula and solve for T2 as follows.

140 + 273 = 413 K450 kPa x 2 = 900 kPa

T2 = (413 K x 900 kPa)/450 kPa = 826 K

Subtracting the value of absolute zero (273) from 826, we obtain T2 = 553°C. This is the final temperature of the gas after doubling the pressure.

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When you use a soap or detergent to wash, the surfactant molecules will interact with the dirt and oils to help wash them away. During this interaction, something called a micelle is formed.

A micelle is a cluster of surfactant molecules that are formed when soap or detergent molecules are mixed with water. When soap or detergent is added to water, the hydrophobic tails of the molecules (which do not mix with water) cluster together, while the hydrophilic heads (which are attracted to water) point outwards towards the water.

Micelles are formed by the hydrophobic tails of the surfactant molecules clustering together in the center, with the hydrophilic heads facing outward.

The soap or detergent's molecules' hydrophobic tails attract oils and dirt, while the hydrophilic heads attract water molecules. The hydrophobic tails of the detergent molecules encircle the dirt and oil particles, while the hydrophilic heads point outward toward the water, creating a micelle.

The micelles disperse the dirt and oil particles throughout the water so that they can be washed away.

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Answer:

Observational

Explanation:

This is the answer because researchers or scientist observe the effect of a  diagnostic test, treatment or other intervention without trying to change anything.

The net ionic equation for the reaction between copper(II) sulfate and ammonium hydroxide depends on whether a reaction occurs.

If a reaction occurs, the balanced net ionic equation will be provided. Otherwise, if no reaction occurs, the notation "nr" will be used to indicate no reaction.When copper(II) sulfate (CuSO4) and ammonium hydroxide (NH4OH) are mixed in aqueous solution, they may undergo a precipitation reaction if a reaction occurs.

In this case, the copper(II) ion (Cu2+) from copper(II) sulfate reacts with the hydroxide ion (OH-) from ammonium hydroxide to form a precipitate of copper(II) hydroxide (Cu(OH)2).The balanced net ionic equation for the reaction, assuming a precipitation occurs, is:

Cu2+ (aq) + 2 OH- (aq) → Cu(OH)2 (s)

On the other hand, if no reaction occurs, it means that there are no significant chemical changes taking place when the two solutions are mixed. In this case, the notation "nr" (no reaction) would be used to indicate that no reaction occurs.

It is important to note that the precise conditions, concentrations, and stoichiometric ratios of the reactants can influence whether a reaction occurs or not. Conducting the actual experiment and observing the formation or lack of formation of a precipitate would provide definitive evidence of whether a reaction takes place.

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The order of increasing disorder is solid, liquid, and gas. This arrangement is based on the increasing freedom of movement and randomness of the particles as we move from solid to liquid to gas.

Solid: Solids have a highly ordered arrangement of particles, with strong intermolecular forces and fixed positions of atoms or molecules.

Liquid: Liquids have less order compared to solids, as particles have more freedom of movement while still maintaining close proximity to one another.

Gas: Gases have the highest degree of disorder among the three phases. Gas particles are widely spaced, move freely, and lack a definite shape or volume.

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The atomic radius of magnesium is approximately 1.736 Å. This can be calculated using the formula: Atomic Radius = (a / 2) * sqrt(3), where a is the lattice parameter for the hcp crystal structure.

To calculate the atomic radius of magnesium, we can use the following formula:

Density = (2 * Atomic Mass) / [(a²) * (c / a) * Na]

where:

Density is the density of magnesium
Atomic Mass is the atomic mass of magnesium
a is the lattice parameter for the hcp crystal structure
c/a is the ratio of the height of the unit cell to the base length of the unit cell
Na is Avogadro's number
We can rearrange this formula to solve for the atomic radius:

Atomic Radius = (a / 2) * sqrt(3)

where:

a is the lattice parameter for the hcp crystal structure
Now, let's plug in the values given in the problem:

Density = 1.74 g/cm3
c/a = 1.624
Na = 6.022 x 10²³ molecules/mol

The atomic mass of magnesium is 24.305 g/mol.

To find the lattice parameter, we can use the fact that the volume of the unit cell is given by:

Volume = a² * (c / a) * sqrt(3) / 2

The density is also related to the volume and the atomic mass by:

Density = Atomic Mass / Volume

We can combine these two equations and solve for a:

a = (4 * Atomic Mass / (sqrt(3) * Density * c))⁽¹/³⁾

Plugging in the values:

a = (4 * 24.305 g/mol / (sqrt(3) * 1.74 g/cm^3 * 1.624))⁽¹/³⁾
a = 3.209 Å

Now we can calculate the atomic radius:

Atomic Radius = (a / 2) * sqrt(3)

Atomic Radius = (3.209 Å / 2) * sqrt(3)

Atomic Radius = 1.736 Å (rounded to three significant figures)

Therefore, the atomic radius of magnesium is approximately 1.736 Å.

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Answer:

evaporation

Explanation:

When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor. Heat from the sun, or solar energy, powers the evaporation process.

Answer:

1. Proton = 4

2. Neutron = 5

3. Electron = 2

Explanation:

9 4Be^2+

From the above, we obtained the following:

Atomic number = 4

Mass number = 9

Charge = +2

1. Determination of the proton.

Atomic number is simply defined as the proton number. This implies that:

Atomic number = proton number

Atomic number = 4

Therefore,

4 = proton number

Proton = 4

2. Determination of the Neutron.

Mass number = Proton + Neutron

Mass number = 9

Proton = 4

Neutron =?

Mass number = Proton + Neutron

9 = 4 + Neutron

Collect like terms

Neutron = 9 – 4

Neutron = 5

3. Determination of the electron.

From the question given

9 4Be^2+

The atom has a charge of +2. This implies that the atom has lose 2 electrons. Thus we can obtain the electron as follow:

Proton = 4

Charge = +2

Electron =?

Electron = Proton – charge

Electron = 4 – 2

Electron = 2

If more \(H_{2}\) and \(N_{2}\) are added to the reaction 3\(H_{2}\) + N2 → 2\(NH_{3}\) after it reaches equilibrium, two events will occur Shift in Equilibrium and Increased Yield of \(NH_{3}\)

1. Shift in Equilibrium: According to Le Chatelier's principle, when additional reactants are added, the equilibrium will shift in the forward direction to consume the added reactants and establish a new equilibrium. In this case, more \(NH_{3}\) will be produced to counteract the increase in \(H_{2}\) and \(N_{2}\).

2. Increased Yield of \(NH_{3}\): The shift in equilibrium towards the forward reaction will result in an increased yield of \(NH_{3}\). As more \(H_{2}\) and \(N_{2}\) are added, the reaction will favor the production of \(NH_{3}\) to maintain equilibrium. This will lead to an increase in the concentration of \(NH_{3}\) compared to the initial equilibrium state.

It is important to note that the equilibrium position will ultimately depend on factors such as the concentrations of \(H_{2}\), \(N_{2}\), and \(NH_{3}\), as well as the temperature and pressure of the system. By adding more reactants, the equilibrium will adjust to achieve a new balance, favoring the formation of more \(NH_{3}\).

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A chemical production company annually produces 500 million pounds of the chemical maleic anhydride using four different reactors. Each reactor can be run on only one of the four settings.

This means that each reactor contributes to the production process by running on a specific setting. The specific settings may vary depending on factors such as temperature, pressure, or other variables relevant to the production of maleic anhydride.

By utilizing all four reactors and their respective settings, the company can achieve the desired annual production of 500 million pounds. Each reactor plays a crucial role in the overall process, ensuring that the necessary quantity of maleic anhydride is produced efficiently and effectively.

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If you add a bunch of the solvent, the solution could not be concentrated enough to recrystallize.

In order to have a solution that is saturated, it is essential that you incorporate the smallest possible quantity of the boiling solvent. If you add an excessive amount of solvent to the mixture, the solution may become too watered down for crystals to form.

It is essential to get the flask down to room temperature before placing it in ice water to finish the cooling process. A hurried crystal formation will result in the crystal lattice becoming contaminated with contaminants. In addition to this, the crystals that form will be more diminutive.

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Answer:

A

Explanation:

Answer:

A. Hard

Explanation: got it correct on Edg

Answer:

Both co-dominance and incomplete dominance produce organisms that are different from the common population. Therefore, the possible benefits associated with co-dominance and incomplete dominance are the increase in the fitness of an individual and in the genetic diversity of a population.

Explanation:

and this is 5 points

Answer:

yes

Explanation:

yes