Mendeleev saw trends in the physical and chemical properties of elements when he organized them by

The values of k and \([N_2O_5]\), we can plug them into the formula and calculate the length of time required for the pressure to rise from 0.110 atm to 0.155 atm.

To find the length of time required for the total pressure in a system containing \(N_2O_5\) at an initial pressure of 0.110 atm to rise to 0.155 atm, we need to use the following formula:

ΔP/Δt = k[A]^x[B]^y

Where ΔP is the change in pressure, Δt is the change in time, k is the rate constant, [A] and [B] are the concentrations of reactants, and x and y are the orders of the reaction with respect to each reactant.

Assuming the reaction is first order with respect to N2O5, we can simplify the formula to:

ΔP/Δt = k\([N_2O_5]\)

Rearranging the formula, we get:

Δt = ΔP / \((k[N_2O_5])\)

To solve for Δt, we need to know the value of k and the concentration of N2O5 at each pressure. We can use experimental data or a chemical kinetics database to find these values.

Once we have the values of k and [\(N_2O_5]\), we can plug them into the formula and calculate the length of time required for the pressure to rise from 0.110 atm to 0.155 atm.

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Water has a much higher specific heat, than air, because it takes more energy to heat water than it does to heat air.

This is a term which is referred to as the quantity of heat which is required to raise the temperature of one gram of a substance by one Celsius degree.

Water has a higher specific heat because it requires more energy to heat water than it does to heat air and an example is result of the specific heat  of the two variables from various studies by scientists in various parts of the world.

Water has a specific heat of 4.186 J/g degrees celsius, versus air, which has a specific heat of 1.005 J/g degrees celsius which is therefore the reason why water was chosen as the correct choice and the one which has a higher specific heat.

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Answer:

sulfur hexafluoride....

Answer:

Explanation:

Sulfur hexafluoride (SF6) or sulphur hexafluoride (British spelling), is an extremely potent and persistent greenhouse gas that is primarily utilized as an electrical insulator and arc suppressant. It is inorganic, colorless, odorless, non-flammable, and non-toxic. SF.

CO₂ is a non-polar molecule. The correct answer is CO₂.

CO₂, which is carbon dioxide, is a non-polar molecule because it has a symmetrical shape and its bond dipoles cancel each other out. In CO₂, the carbon atom is bonded to two oxygen atoms. The molecule has a linear shape, with the carbon atom in the center and the oxygen atoms on either side.

The bond between the carbon atom and each oxygen atom is polar because oxygen is more electronegative than carbon, creating a partial negative charge on the oxygen atoms and a partial positive charge on the carbon atom. However, because the molecule is linear, the bond dipoles are equal in magnitude and opposite in direction, effectively canceling each other out.

This results in a non-polar molecule overall, with no permanent bond dipole moment. To summarize, CO₂ is a non-polar molecule because its bond dipoles cancel each other out due to its symmetrical linear shape. Hence, CO₂ is the correct answer.

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Hence, the probability that the mean cholesterol level of the sample will be greater than 217 is 0.034. Answer: 0.034.According to the given statement, we have the following data.

mean (μ) = 205 mg/dLstandard deviation

(σ) = 35 mg/dLsample size

(n) = 46(a) Probability that the mean cholesterol level of the sample will be no more than 205.To find this, we will use the z-score formula.z

= (x - μ) / (σ/√n)Here,

x = 205

μ = 205

σ =

35n

= 46Plugging in these values, we get,

z = (205 - 205) / (35/√46)

z = 0Hence, the probability that the mean cholesterol level of the sample will be no more than 205 is 0.5. Answer: 0.5

(b) Probability that the mean cholesterol level of the sample will be between 200 and 210:

To find this, we need to standardize the values and use the z-table.P(z < (210 - 205) / (35/√46)) - P(z < (200 - 205) / (35/√46))P(z < 1.65) - P(z < -1.65) = 0.4495 - 0.0505

= 0.3990Hence, the probability that the mean cholesterol level of the sample will be between 200 and 210 is 0.3990. Answer: 0.3990

(c) Probability that the mean cholesterol level of the sample will be less than 195: To find this, we need to standardize the values and use the z-table.P(z < (195 - 205) / (35/√46))P(z < -2.91) = 0.002Hence, the probability that the mean cholesterol level of the sample will be less than 195 is 0.002. Answer: 0.002

(d) Probability that the mean cholesterol level of the sample will be greater than 217: To find this, we need to standardize the values and use the z-table.P(z > (217 - 205) / (35/√46))P(z > 1.82) = 0.034 Answer: 0.034.

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Answer:

Models

Explanation:

Answer:

Rocky road ice cream is an example of a __________Homogeneous___________ mixture.

The number of moles of O₂ used to produce 4 moles of NO is 2 moles

First, shall write the balanced equation. This is given below:

N₂ + O₂ -> 2NO

From the balanced equation above,

2 moles of NO were obtained from 1 mole of O₂

With the above information, we can determine the number of moles of O₂ used to produce 4 moles of NO. This can be obtained as follow:

From the balanced equation above,

2 moles of NO were obtained from 1 mole of O₂

Therefore,

4 moles of NO will be obtain from = (4 × 1) / 2 = 2 moles of O₂

Thus, number of mole of O₂ used is 2 moles

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P(C|G) = P(C and G) / P(G)

Given that the probability of a student taking Chemistry AND Geology is 0.08 (P(C and G) = 0.08) and the probability of a student taking Geology is 0.45 (P(G) = 0.45), we can substitute these values into the formula:

P(C|G) = 0.08 / 0.45 ≈ 0.1778

Therefore, the probability that a student will choose Chemistry given that the student is taking Geology is approximately 0.1778, or 17.78%.

P(Disease|Positive) = (P(Positive|Disease) * P(Disease)) / P(Positive)

Given that the disease is common in 3% of the population (P(Disease) = 0.03), the error rate for people who are disease-free getting a positive reaction is 7% (P(Positive|Disease-free) = 0.07), and the error rate for people who have the disease getting a negative reaction is 2% (P(Negative|Disease) = 0.02), we can calculate the probability of a positive result (P(Positive)) as follows:

P(Positive) = (P(Positive|Disease) * P(Disease)) + (P(Positive|Disease-free) * P(Disease-free))

= (0.98 * 0.03) + (0.07 * 0.97)

≈ 0.0294 + 0.0679

≈ 0.0973

Now, we can substitute these values into Bayes' theorem:

P(Disease|Positive) = (0.98 * 0.03) / 0.0973

≈ 0.0294 / 0.0973

≈ 0.3026

Therefore, the probability that a person tested at random indeed has the disease given that the test result shows positive is approximately 0.3026, or 30.26%.

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Answer: owa owa

Explanation: owa owa owa owa

When (Z)-4-ethyloct-4-ene is subjected to chlorohydrin formation conditions (\(Cl_2\), \(H_2O\)), two products are obtained due to the presence of two different types of hydrogens in the starting alkene.

The reaction of (Z)-4-ethyloct-4-ene with chlorine (\(Cl_2\)) and water (\(H_2O\)) occurs through an addition reaction, where the Cl and OH groups are added to the two carbons that were originally double bonded.

Since the starting alkene has a Z configuration, the two carbons involved in the double bond have different types of hydrogens, which will result in the formation of two different products:

The hydrogen that is trans to the ethyl group will be replaced by a Cl atom, and the OH group will be added to the carbon that is cis to the ethyl group, resulting in the formation of (Z)-4-ethyloct-4-en-1-ol-2-chloride:

Cl

|

\(H_3C-CH_2-CH=CH-CH_2-CH_2-CH_2-CH_2-CH_2-OH\)

The hydrogen that is cis to the ethyl group will be replaced by a Cl atom, and the OH group will be added to the carbon that is trans to the ethyl group, resulting in the formation of (Z)-4-ethyloct-4-en-2-ol-1-chloride:

Cl

|

\(H_3C-CH_2-CH=CH-CH_2-CH_2-CH_2-CH_2-CH_2-OH\)

Both products are formed in equal amounts since the reaction is carried out under symmetric conditions.

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From the mole ratio of the acid to base, the higher the volume of the acid used, the higher will the volume of the base required to neutralize the acid.

The color will the solution of potassium phthalate and phenolphthalein appear is Pink.

The mole ratio of the acid-base reaction between HCl and NaOH is determined from the equation of the reaction given below.

Equation of the reaction: HCl + NaOH ----> NaCl + H₂O

From the equation of the reaction, the mole ratio of the acid-base reaction between HCl and NaOH is 1 : 1.

Hence, if the concentration of the acid and the base are the same in the acid-base reaction between HCl and NaOH, the more the volume of acid used, the more will be the volume of base required to neutralize the acid.

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Answer:

It goes grain of salt water molecule human skin cell then E coli bacteria

If Earth revolved at a faster rate, what would most likely be daylight hours would decrease. Therefore, option B is correct.

Earth's rotation can be described as the rotation of planet Earth around its own axis and changes in the orientation of the rotation axis in space. Earth rotates once in 24 hours around Sun, but once in 23 hours, 56 minutes, and 4 seconds w.r.t. other distant stars.

Earth's rotation can be slowed slightly with time therefore daylight was shorter in the past due to the tidal effects the Moon has on Earth's rotation.

The earth's spinning on its axis causes days to turn into nights. The rise and fall of tided effect on the Direction of the Wind, Cyclones, Ocean currents, and change of day and night.

If the earth's rotation becomes faster it will complete one spin in less than 24 hours therefore, the daylight hours would decrease.

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Answer:

The pOH of the solution is 11.23.

Explanation:

To solve this problem, we must remember the following formula for pH: pH = -log[H+].

If we plug in the value we are given, we can find the pH.

pH = -log[H+]

pH = -log(1.7*10^-3)

pH = 2.77

To find the pOH, we use the following formula:

pH + pOH = 14

To solve, we should plug in the value we found above for pH and solve for the pOH.

2.77 + pOH = 14

pOH = 11.23

Therefore, the correct answer is 11.23.

Hope this helps!

Answer:

1. 2.63x10^6

2. 39.2

Both answers have been rounded

Answer:

62,000,000 written in scientific notation is 6.2 × 107.

Explanation:

Answer:

Explanation:

A chemical formula can be defined as a notation that is used to show which element and how many is contained in a chemical compound.

Also, in chemistry, the sum of charges of the anion and the cation of any ionic compound is always equal to zero.

A chemical equation is considered to be balanced when the amount of reactants on the left is equal to the amount of products on the right.

Therefore;

[2]FeBr3 + [3]Na2S → [1]Fe2S3 + [6]NaBr

In the above chemical equation, we will balance the reactants in the chemical equation with the smallest coefficients possible;

\( 2FeBr_{3} + 3Na_{3}S ----> Fe_{2}S{3} + 6NaBr \)

Two (2) moles of Iron (III) Bromide reacts with two (2) moles of Sodium Sulfide to form Iron (III) Sulfide and Sodium Bromide.

The equation 2Al + _F₂ → 2AlF₃ is balanced by making the coefficient of fluorine, F₂ three (3)

To obtain the coefficient of fluorine, F₂ that will balanced the equation, we must obtain the balance equation.

The equation 2Al + _F₂ → 2AlF₃ can be balanced as illustrated below:

2Al + F₂ → 2AlF₃

There are 2 atoms of F on the left side and 6 atoms on the right side. It can be balanced by writing 3 before F₂ as shown below:

2Al + 3F₂ → 2AlF₃

Now, the equation is balanced.

Thus, we can conclude that the coefficient of fluorine, F₂ that balanced the equation is 3

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The fact of expanding of water as much as 9% of its volume as it freezes is the basis of frost wedging.

Water starts to contract as expected after it is cooled to a temperature of roughly 4 degrees Celsius. Once it hits the freezing point, it continues to grow gradually until it freezes and expands by around 9%.

When water fills a fissure, it freezes, expands (8–11% more volume than liquid water), and this process results in frost wedging. An enormous amount of pressure (up to 30,000 pounds per square inch) is applied to the rock by the growing ice, which causes the crack to widen.

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a)(i) Derive the mathematical expression for calculating the equilibrium constant (K) for a redox reaction at 25°CRedox reactions occur when electrons are transferred from one atom to another in the reactants.

The Nernst equation is used to calculate the potential of a redox reaction under non-standard conditions. The Nernst equation is:Ecell = E°cell - (RT/nF)ln Q where E°cell is the standard cell potential, R is the gas constant, T is the temperature in kelvins, n is the number of electrons transferred in the redox reaction, F is Faraday's constant, and Q is the reaction quotient.

To calculate the average current per spoon that must flow during the electroplating process, we use Faraday's laws of electrolysis :F = q/n F where F is the Faraday constant, q is the charge, n is the number of electrons transferred, and F is the Faraday constant. We know that the mass of silver deposited is 2.00 g and the molar mass of silver is 107.868 g/mol .

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Answer:

B

Explanation:

scientists always look for evidence

Answer:

Yea its B

Explanation: The person above me legit toke the answer out of my mouth

Stars are luminous balls of plasma that are held together by gravity. They create energy through nuclear fusion, which fuses lighter elements into heavier ones. As a result, stars generate a wide range of elements, including carbon, nitrogen, oxygen, and iron.

However, stars do not create elements by splitting the nuclei of small atoms into the nuclei of larger atoms.Option C is the correct answer. When stars die, they can explode in a cataclysmic event known as a supernova. During a supernova, the core of the star collapses, and the outer layers are expelled into space. As a result, supernovae are one of the primary ways in which new elements are formed. The intense heat and pressure generated by the supernova can cause lighter elements to fuse into heavier ones, creating elements such as gold, platinum, and uranium. These elements are then dispersed throughout the galaxy and become the building blocks of future star generations. Thus, stars can explode cataclysmically when they die and contribute their matter to future star generations.

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Explanation:

oh shi sorry I wish I could help but I'm stupid

Answer:

5 000 000 (5 million atoms)

Explanation:

Let us assume that a vanadium atom has a spherical shape.

diameter of a sphere = 2 x radius of the sphere

Thus,

Radius of a vanadium atom = 130 pm

                                              = 130 x \(10^{-12}\) m

The diameter of a vanadium atom = 2 x radius

                                                         = 2 x 130 x \(10^{-12}\)

                                               = 260 x \(10^{-12}\) m

Given a distance of 1.30 mm = 1.30 x \(10^{-3}\) m,

The number of vanadium atoms required to span the distance = \(\frac{1.3*10^{-3} }{260*10^{-12} }\)

                                                  = 5000000

Therefore, the number of vanadium atom that would span a distance of 1.30 mm is 5 million.

At Location C, nightfall is experienced by the Northern Hemisphere. At Location C, the Northern Hemisphere is inclined away from the Sun.

The Northern Hemisphere tilts away from the Sun at its greatest angle around December 21. We experience the least amount of daylight at this time of year, which is known as the northern winter solstice.

The Earth's axis is tilted most closely towards the sun twice a year during what are known as the solstices. The longest day occurs in the hemisphere that is slanted most towards our star, whereas the longest night occurs in the hemisphere that is tilted away from the sun.

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To calculate the molar mass of the unknown compound, we can use the ideal gas law equation g/mol is 33.9 g/mol.

I apologize for any confusion. Could you please provide more specific information or context regarding the compound you are referring to? Without knowing the specific compound or additional details, it is difficult to provide a meaningful response.In chemistry, a compound refers to a substance composed of two or more different elements chemically bonded together. For example, water (H2O) is a compound composed of hydrogen and oxygen.Compound Interest In finance, compound interest refers to the interest that is calculated on the initial principal as well as the accumulated interest from previous periods. This means that the interest earned in each period is added to the principal, and subsequent interest is calculated based on the new total.

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The correct sequence of events for acid deposition is: c. Y > Z > X > W

Y. Combustion releasing SO2 and NOx -> X. Dissociation of pollutants -> Z. Formation of secondary pollutants -> W. Deposition of ions on vegetation or soil.

Therefore, the correct sequence is:

c. Y > Z > X > W

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