For a very weak acid, you would expect the pH to be:a. Higher than the pKab. Equal to the pKac. Lower than the pKad. Equal to double the pKa

At an altitude of 11,000 feet, the temperature would be approximately 47.6 degrees Fahrenheit, considering a linear drop of 1.1 degrees per thousand feet.

To calculate the temperature at an altitude of 11,000 feet, we need to consider the given information that there is a 1.1-degree drop in temperature for every thousand feet of altitude gain. Starting with a ground temperature of 59.7 degrees, we can calculate the temperature change based on the altitude.

The temperature drop per thousand feet is 1.1 degrees. Therefore, for 11,000 feet, we can calculate the temperature drop as follows:

Temperature drop = (11,000 ft / 1000 ft) * 1.1 degrees = 12.1 degrees

To find the temperature at the altitude of 11,000 feet, we subtract the temperature drop from the ground temperature:

Temperature at 11,000 ft = Ground temperature - Temperature drop = 59.7 degrees - 12.1 degrees = 47.6 degrees

Therefore, the temperature at an altitude of 11,000 feet would be approximately 47.6 degrees.

It's important to note that this calculation assumes a linear relationship between altitude and temperature change and does not take into account other atmospheric factors that may affect temperature variation at different altitudes.

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The balanced reaction is

4 Al + 3 O₂   →   2 Al₂O₃

so that for every 4 moles of Al and 3 moles of O2, you end up with 2 moles of Al₂O₃.

• Al has molar mass ≈ 26.982 g/mol

• O has molar mass ≈ 15.999 g/mol

• Al₂O₃ thus has molar mass ≈ 101.961 g/mol

You start with 5.4 kg = 5,400 g of Al, or

(5.4 kg Al) • (1/26.982 mol/g) ≈ 200.133 mol Al

Al₂O₃ is produced in a ratio of 2 moles to every 4 moles of Al, so you end up with about 100.067 mol Al₂O₃, which has a mass of

(100.067 mol Al₂O₃) • (101.961 g/mol) ≈ 10,202 g = 10.2 kg

so the answer is C.

When the reaction is subjected to pressure, the equilibrium will shift to the side with fewer gas molecules, which is the left side. Therefore, the answer is c. left.

According to Le Chatelier's principle, when a system at equilibrium is subjected to a change in pressure, it will respond by shifting in a way that reduces the effect of the change. In this case, increasing the pressure would cause the equilibrium to shift towards the side with fewer gas molecules to alleviate the increase in pressure.

Since there are fewer gas molecules on the left side of the reaction (2 CO + O2), the equilibrium will shift to the left to reduce the total number of gas molecules. This means that the concentrations of CO and O2 will increase, while the concentration of CO2 will decrease until a new equilibrium is established. Thus, the equilibrium will shift to the left.

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Answer:

the angle of reflected light distorts the image to appear larger or smaller

Answer:

I would go for number 5 . It sounds more logical to me.

In this reaction Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) Magnesium acts as a reducing agent.

Only question should be of 4 or answer of other questions should also be there.

When gasoline evaporates from a fuel gas can energy is released. Therefore, the correct option is option A.

Energy, which is observable in the execution of labour as well as through the emission of heat and light, is the quantitative quality which gets transmitted to a body as well as to a physical system in physics. Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed.  When gasoline evaporates from a fuel gas can energy is released.

Therefore, the correct option is option A.

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BOD = (14.8 - DO2) x 0.125 = 211.3 mg/LDO2 = 12.175 mg/LHence, the Biochemical Oxygen Demand (BOD) of the sample is 13.825 mg/L.

The given terms in the question are,211.3 mg/ LQ.6: 100 ml waste water sample was diluted with 800 ml of water. Initial dissolved oxygen level (DO:) was found to be 14.8 mg/1. After 5 days of incubation, the final dissolved oxygen level (DO) was found.In order to calculate the Biochemical Oxygen Demand (BOD) of a sample, the difference between the initial dissolved oxygen level (DO:) and the final dissolved oxygen level (DO) needs to be found.The formula for Biochemical Oxygen Demand is:Biochemical Oxygen Demand (BOD) = (Initial Dissolved Oxygen level) - (Final Dissolved Oxygen Level)BOD = DO1 - DO2BOD = 14.8 - DO2BOD = 14.8 - DO2.

To determine the value of DO2, first the dilution factor needs to be found.Dilution Factor = Volume of initial sample / Total VolumeDilution Factor = 100 / 800Dilution Factor = 0.125Since the initial sample was diluted by a factor of 0.125, the BOD can be calculated as follows:BOD = (DO1 - DO2) x Dilution Factor211.3 mg/L is the value of LQ, which is the conversion factor to convert milligrams per liter of oxygen to BOD value.

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Answer:

To determine the number of moles of solute present in a solution, we can use the formula:

moles of solute = molarity x volume (in liters)

Given that the volume of the solution is 5.0 L and the molarity is 5.0 M, we can calculate the number of moles of solute as:

moles of solute = 5.0 M x 5.0 L

moles of solute = 25 mol

Therefore, there are 25 moles of potassium nitrate (KNO3) present in 5.0 L of a 5.0 M solution.

How many moles of solute are present in 5.0 L of a 5.0 M potassium nitrate (KNO3) solution?

Answer:

25 moles

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.

As the reaction between the two gases proceeds, the volume of the container will decrease due to the formation of a new gas, XY, which takes up less space than the two gases combined.

In a closed system, the decrease in volume is accompanied by an increase in pressure, as the molecules of XY have less space to move around in than the molecules of X and Y.

This is because the increased pressure will cause the molecules to move faster, thereby increasing the kinetic energy of the system. This increase in temperature will cause the reaction to speed up, leading to more molecules of XY being formed. As the reaction continues, the pressure, temperature, and volume will continue to change in a dynamic equilibrium until all the reactants are used up.

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A total of 18 electrons are needed by most of the transition metals in order to attain stability and achieve noble gas configuration.

Transition metals or elements possess 1 s-orbital, 3 p-orbitals, and 5 d-orbitals. Hence, they comprise a total of 9 orbitals in which they can accommodate electrons to achieve noble gas configuration and become stable. As each orbital can contain only 2 electrons, a total of 9 orbitals will have 18 electrons.

Transition metals belong to group 3 to 12, lying between s and p-block elements. Consequently, when a metal complex has 18 electrons, it is said to have attained the same electron configuration as the noble gas in the period. This is because the combination of these nine atomic orbitals with ligand orbitals produces nine molecular orbitals that are either metal-ligand bonding or non-bonding.

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1.6 x 10⁻¹⁰ M is the concentration of OH− ion of the solution has a pH of 4.20.

pH of any solution is define as the negative logarithm of the concentration of hydrogen ions i.e. pH = -log[H⁺].

Equation of pH will be written in the form of base 10 by removing the log as:

[H⁺] = \(10^{-pH}\)

Given value of pH is 4.20 and concentration of H⁺ ions will be calculated as:

[H⁺] = 10⁻⁴°²⁰

[H⁺] = 6.3 × 10⁻⁵

Now the relation between pH & pOH in term of base 10 is:

[H⁺][OH⁻] = 10⁻¹⁴

[OH⁻] = 10⁻¹⁴ / [H⁺]

[OH⁻] = 10⁻¹⁴ / 6.3 × 10⁻⁵ = 1.6 x 10⁻¹⁰ M

Hence, option (E) is correct i.e. 1.6 x 10⁻¹⁰ M.

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For the given electrolysis of water reaction, the half reactions are as follows:2 H2O(l) → O2(g) + 4H+(aq) + 4e-2H+(aq) + 2e- → H2(g)The balanced equation is 2H2O(l) → 2H2(g) + O2(g)For producing one mole of O2 gas, 4 moles of electrons are needed (from the first half-reaction).

For producing one mole of H2 gas, 2 moles of electrons are needed (from the second half-reaction)Number of moles of O2 gas required per day = (10 × 0.840 kg)/32 kg mol-1 = 0.263 mol Number of moles of H2 gas produced per day = 0.5 × 0.263 mol = 0.132 mol.

Number of moles of electrons required = 4 × 0.263 mol = 1.052 mol The electric current required for producing 1.052 mol of electrons in a day = 1.052 × (96500 C/mol) / (24 × 60 × 60 s) = 0.012 AThus, the minimum current needed to produce enough oxygen to meet the daily needs of a crew of 10 people is 0.012 A. Current = 0.012 A.

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The polycyclic alkane composed of 12 five-membered rings is dodecahedrane (Option D).

Alkanes, also known as paraffin, are saturated hydrocarbons that have only single covalent bonds linking carbon atoms to each other or to hydrogen atoms. Methane, ethane, propane, and butane are examples of alkanes, which are the simplest kind of hydrocarbon molecule. Because of their weak van der Waals forces, alkanes have low melting and boiling temperatures. Their boiling points are primarily determined by their chain length, shape, and branching, with straight-chained molecules having higher boiling points than their branched counterparts.

Thus, the correct option is D.

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The pH of a buffer solution is approximately 9.63 that is consisting of 1.00 M\(NH_3\) and 0.75 M \(NH_4Cl\)with a Kb value of \(1.8 * 10^-^5\), we can use the Henderson-Hasselbalch equation.

The Henderson-Hasselbalch equation is used to determine the pH of a buffer solution, which consists of a weak acid and its conjugate base (or a weak base and its conjugate acid). In this case, \(NH_3\) acts as a weak base, and \(NH_4Cl\) is its conjugate acid.

The Henderson-Hasselbalch equation is given as:

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

To apply this equation, we need to find the pKa of \(NH_4Cl\). Since \(NH_4Cl\)is the conjugate acid of \(NH_3\), we can use the pKa of \(NH_3\), which is calculated as \(pKa = 14 - pKb. Therefore, pKa = 14 - log(Kb) = 14 - log(1.8 * 10-5) =9.75\)

Next, we can substitute the known values into the Henderson-Hasselbalch equation:

\(pH = 9.75 + log([NH_4Cl]/[NH_3]) = 9.75 + log(0.75/1.00) = 9.75 - 0.12 = 9.63\)

Thus, the pH of the given buffer solution is approximately 9.63.

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Answer:

You plot the points on graph according to the the table

Once you plotted every point on the table, you connect the dots.

Example: Jan (Month) Go Up To 44 , Feb(Month) Go Up 40

I HOPE I HELP AS MUCH AS POSSIBLE

Answer:

Explanation:

When you use electricity to charge your car, you can integrate renewable resources like solar into the fueling process. Without solar, your electric vehicle is still effectively running off of fossil fuels – it's just the fossil fuels utilized at the power plant and not within your engine.

Fossil fuels include substances like natural gas, coal, and oil. It is possible for electric cars to run on these fossil fuels. Fossil fuels like coal are burnt up to generate electricity. So when cars run on electricity, they are indirectly tapping into fossil fuels.

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The entropy change of the surroundings can be calculated from the enthalpy change (ΔH) of the reaction if the temperature is known.

This relationship is described by the equation:

ΔS_surroundings = -ΔH / T

where ΔS_surroundings is the entropy change of the surroundings, ΔH is the enthalpy change of the reaction, and T is the temperature in Kelvin. The negative sign indicates that the entropy change of the surroundings is opposite in sign to the enthalpy change of the reaction. Entropy is a concept used in various fields, including physics, information theory, and statistics. The term "entropy" refers to the measure of disorder or uncertainty in a system.

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Metals and non-metals are the types of elements that are most likely to create ionic bonds. The only things with metallic bonds between their atoms are metals. The two non-metals easily combine to create covalent bonds.

What is a covalent bond defined as?

An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or shared pairs are the names given to these electron couples. Covalent bonding is the steady equilibrium of the attractive and repulsive forces between atoms when they share electrons.

The entire movement of valence electron(s) between atoms is referred to as an ionic bond. It is a kind of chemical link that produces two ions with opposing charges. In ionic bonds, the nonmetal takes the lost electrons to form a negatively charged anion while the metal loses them to become a positively charged cation. Electrostatic pull between metal cations and delocalized electrons produces metallic bonds. Many of the physical characteristics of metals, including conductivity and malleability, are explained by the type of metallic interaction that exists.

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There are 7 neutrons in an atom of nitrogen-14.

Nitrogen-14 is primarily an isotope of nitrogen, as is well known. We can also describe it as a neutral atom. Additionally, various isotopes typically have a variable ratio of neutrons to protons.

As is common knowledge, an atom's atomic number represents the total number of protons that make up its nucleus. We are informed that nitrogen has a mass number of 14, and we are also aware that nitrogen has an atomic number of 7.

It is discovered that the atomic number and the number of protons are same. This demonstrates that the nucleus of any atom that is an isotope of nitrogen will in general have seven protons.

Additionally, the number of electrons equals the amount of protons. The number of electrons will therefore be 7, we can say. We shall now determine how many neutrons are there. As is well known, mass is equal to the sum of the protons and neutrons. As a result, there will be = 14 - 7 = 7 neutrons.

As a result, we may say that nitrogen-14 has 7 electrons, 7 protons, and 7 neutrons and that it is neither an anion nor a cation. It's an impartial atom.

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In this question, we have photons with 0.237 J and 659 nm, now we need to find out how many photons there are in this situation, we can do that by looking at the energy of one single photon with the following formula:

E = h*f, since we don't have the f (frequency), we can use the relationship of frequency with speed of light and wavelength

E = h * c/λ

h is Planck's constant = 6.626*10^-34 J*s

c is the speed of light = 3.0*10^8 m/s

λ is the wavelength = 659*10^-9 m

E = 6.626*10^-34 * (3.0*10^8/659*10^-9)

E = 3.02*10^-19 J, this is the energy of a single photon

Now we can take the total energy, 0.237 J and check how many photons we have:

0.237/3.02*10^-19 = 7.85*10^17 photons

Answer:

No it mostly likely would not because the first element(Neon) is already stable as it's outermost shell is completely filled

Explanation:

I'm not 100% sure about this because I know that some weird bonds do form in real life especially with the dative covalent

The combined water's ultimate temperature is 45.6 0C.

The final temperature of the mixture is calculated as follows;

Based on the principle of conservation of energy;

Heat lost by hot water = heat gained by the cold water

mcΔθ2  = mcΔθ1

75 × 4.184 × (75.7-T) = 100 × 4.184 ×  (T-23)

75 ×  (75.7-T) = 100×  (T-23)

(75.7 - T) = 1.333(T - 23)

simplifying the above equation, then we get

75.7-T = 1.333 T - 30.659

75.7 + 30.659 = 1.333 T + T

106.359 = 2.333 T

T = 106.359 / 2.333

T = 45.6 °C

Thus, the final temperature of the mixed water is 45.6 °C

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Answer:

107.9

Explanation:

Answer:

102.58 cal.

Explanation:

Given data:

Mass of mercury = 622 g

Initial temperature = 37°C

Final temperature = 42°C

Specific heat capacity of mercury = 0.138 J/g.°C

Energy required = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 42°C - 37°C

ΔT = 5°C

Q = 622 g × 0.138 J/g.°C × 5°C

Q = 429.18 J

J to cal:

429.18 J × 1 cal /4.184 j

102.58 cal.

Answer:

gas vibrate and move freely at high speeds. liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place.

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