Rank the elements aluminum, sodium, and phosphorus in order of decreasing conductivity.

The one with the lowest boiling point is b. Si.

Explanation:

Space exploration was aided most by the use of liquid fuel.

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The compound that contains both sigma and pi bonds has been \(\rm \bold{H_2CO}\). Thus, option B is correct.

The compounds have been resulted by the sharing of the valence electrons between atoms, for the completion of octet of each elements.

The bonds can be saturated with the presence of only sigma bond. The unsaturated bonds has presence of pi bonds as well. The bond with one pi and one sigma has been a double bond, while 1 sigma and 2 pi has been a triple bond.

The bonds present in the following structures has been:

\(\rm HCCl_3=4\;\sigma\;bonds\\H_2CO=2\;\sigma,\;1\;\pi\;bond\\H_2S=2\;\sigma\;bonds\\HBr\;=1\;\sigma\;bond\)

The compound with the presence of both sigma and pi bonds has been \(\rm \bold{H_2CO}\). Thus, option B is correct.

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Answer:

Corresponding with orange light, is the wavelength that blue solutions absorb the most.

Explanation:

If light is diffused through a solution of a given color, emerges of light from another wavelength is consumed and fades away. However, the wavelength of light relating to the color of such a solution is transferred. The color of the light is consumed is usually the contrasting one being transferred. As seen in a color wheel where, blue complement orange, red complement green, and yellow complement violet.

Thus, for a blue substance in solution, its complementary color is said to be orange, Given that the wavelength of orange color varies from 600 - 640 nm where it's maximum absorbance is approximately 633 nm. This wavelength is what is employed when analyzing the standard solutions and drink samples.

Answer:

2

Explanation:

A

Answer: 4!!!

Explanation: j took the quiz!!!

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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The time required for a mixture containing 0.02 mol of p-chlorophenyl isopropyl ether and 0.018 mol of bromine to reach 65% conversion of p-chlorophenyl isopropyl ether is 31.1 minutes.

The rate law for this reaction is given by:

rate = k1[A][B]^2

where [A] is the concentration of p-chlorophenyl isopropyl ether, [B] is the concentration of bromine, and k1 is the rate constant.

At 65% conversion, 35% of the initial amount of p-chlorophenyl isopropyl ether remains, which is equivalent to 0.006 molding this is a second-order reaction with respect to bromine, the rate of the reaction can be expressed as:

rate = k1[A][B]^2 = k2[C][B]

where [C] is the concentration of the monobrominated product and k2 is the rate constant for the reaction of the mono brominated product with bromine.

At 65% conversion, the concentration of mono brominated product is 0.02 mol - 0.006 mol = 0.014 mol.

Substituting the concentrations and rate constants into the rate law, we get:

k1[A][B]^2 = k2[C][B]

2 k1 (0.02 mol) [B]^2 = k2 (0.014 mol) [B]

Solving for [B], we get:

[B] = (k2 / (2 k1)) (0.014 mol / 0.02 mol)^(1/2) = 0.000197 lit/mol

The time required to reach 65% conversion can be calculated using the integrated rate law for a second-order reaction:

t = 1 / (k1 [A]0) * (1 / (0.35 [A]0) - 1)

where [A]0 is the initial concentration of p-chlorophenyl isopropyl ether.

Substituting the values, we get:

t = 1 / (2 lit/mol-min * 0.02 mol) * (1 / (0.35 * 0.02 mol) - 1) = 31.1 min

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The mass of the material after 4 hours is approximately 39.915mg. Rounded to the nearest whole number, the answer is 40mg .

To solve this problem, we can use the concept of exponential decay and the given information that the material decays at a rate proportional to the amount present.

Since the material decays at a rate proportional to the amount present, we can express the decay using the equation: dM(t)/dt = k * M(t),

We are given that after two hours, the material has lost 40 percent of its original amount. This means that M(2) = 0.6 * M(0) = 0.6 * 80 = 48mg.

We can integrate the differential equation to obtain: ∫(1/M(t)) dM = ∫k dt.

Integrating both sides, we get: ln(M(t)) = kt + C,

Substituting the initial condition M(0) = 80, we have:

ln(80) = 0 + C,

C = ln(80).

Therefore, the equation becomes:

ln(M(t)) = kt + ln(80).

Solving for k, we have: k = (ln(48) - ln(80)) / 2 ≈ -0.208.

ln(M(4)) = -0.208 * 4 + ln(80).

Calculating this value: ln(M(4)) ≈ -0.832 + ln(80) ≈ 3.688.

Taking the exponential of both sides, we have: M(4) ≈ e^(3.688).

Calculating this value: M(4) ≈ 39.915.

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The sample will degrade at a rate of 151.74 decays per minute in 1000 years and 10.24 decays per minute in 50000 years, respectively.

To calculate the decay rate of the carbon sample in Part A and Part B, we need to consider the half-life of carbon-14. The half-life of carbon-14 is approximately 5730 years.

Part A:

To find the decay rate of the sample in 1000 years, we need to determine the number of half-lives that have passed in 1000 years. We can do this by dividing the time elapsed (1000 years) by the half-life of carbon-14 (5730 years):

Number of half-lives = 1000 years / 5730 years ≈ 0.1748

Since each half-life halves the initial quantity, we can calculate the remaining fraction of the sample after 0.1748 half-lives:

Remaining fraction = (1/2)^(0.1748) ≈ 0.9391

The decay rate is given as 161.5 decays/minute, so we can calculate the decay rate of the sample in 1000 years:

Decay rate in 1000 years = Remaining fraction * Initial decay rate

= 0.9391 * 161.5 decays/minute

≈ 151.74 decays/minute

Therefore, the decay rate of the sample in 1000 years is approximately 151.74 decays/minute.

Part B:

To find the decay rate of the sample in 50000 years, we need to determine the number of half-lives that have passed in 50000 years:

Number of half-lives = 50000 years / 5730 years ≈ 8.7257

Using the same logic as in Part A, the remaining fraction after 8.7257 half-lives is:

Remaining fraction = (1/2)^(8.7257) ≈ 0.0632

Now we can calculate the decay rate in 50000 years:

Decay rate in 50000 years = Remaining fraction * Initial decay rate

= 0.0632 * 161.5 decays/minute

≈ 10.24 decays/minute

Therefore, the decay rate of the sample in 50000 years is approximately 10.24 decays/minute.

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When a powder is dissolved in water, it changes the temperature because the chemical reaction that occurs between the particles of the solute and the solvent when they mix. The heat energy that is released or absorbed when two particles come together is known as enthalpy of solution.

In order to understand the temperature change in detail, we need to look at the two types of enthalpies that are involved when a powder is dissolved in water.

The first type is called the lattice enthalpy which is the energy that is needed to break the bonds between the particles in the solid. The second type is the hydration enthalpy which is the energy that is released when the particles of the solute are surrounded by the solvent particles.

When a powder is dissolved in water, the lattice enthalpy is broken and the particles of the solute are dispersed throughout the solvent. This requires energy, so the temperature of the solution decreases. Then the solvent particles surround the particles of the solute and release energy, so the temperature of the solution increases. The overall temperature change depends on the difference between the lattice enthalpy and the hydration enthalpy.

When a powder is dissolved in water, it changes the temperature because of the chemical reaction that occurs between the particles of the solute and the solvent when they mix. When two particles come together, the heat energy that is released or absorbed is known as enthalpy of solution. There are two types of enthalpies involved when a powder is dissolved in water.

The first type is lattice enthalpy, which is the energy that is needed to break the bonds between the particles in the solid. The second type is hydration enthalpy, which is the energy that is released when the particles of the solute are surrounded by the solvent particles.

When a powder is dissolved in water, the lattice enthalpy is broken, and the particles of the solute are dispersed throughout the solvent. This requires energy, so the temperature of the solution decreases. Then, the solvent particles surround the particles of the solute and release energy, so the temperature of the solution increases. The overall temperature change depends on the difference between the lattice enthalpy and the hydration enthalpy.

If the lattice enthalpy is higher than the hydration enthalpy, the solution will be cold because more energy is required to break the bonds in the solid than is released when the particles are surrounded by solvent particles. Conversely, if the hydration enthalpy is higher than the lattice enthalpy, the solution will be hot because more energy is released when the particles are surrounded by solvent particles than is required to break the bonds in the solid.

When a powder is dissolved in water, the temperature of the solution changes because of the chemical reaction between the particles of the solute and the solvent when they mix. The overall temperature change depends on the difference between the lattice enthalpy and the hydration enthalpy. If the lattice enthalpy is higher than the hydration enthalpy, the solution will be cold, and if the hydration enthalpy is higher than the lattice enthalpy, the solution will be hot.

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The units of the rate constant are \(M^-^1s^-^1.\)

The overall order of a reaction is the sum of the orders of the reactants in the rate law. For a reaction with an overall order of 2, the rate law has the form:

rate =\(k[A]^m[B]^n\)

where k is the rate constant, A and B are reactants, and m and n are the orders of A and B, respectively. Since the overall order is 2, we have m + n = 2.

The units of the rate constant depend on the overall order of the reaction and the units of the concentration of the reactants. For a second-order reaction, the units of the rate constant are:

k = \(M^-^1s^-^1\)

This can be derived from the rate law:

rate = \(k[A]^2\)

where the units of rate are M/s and the units of [A] are M. Substituting the units, we get:

M/s = (M-1s-1) ×\(M^2\)

Simplifying, we get:

M/s =\(M^3s^-^1\)

Dividing by\(M^2\), we get:

1/s =\(M^-^1s^-^1\)

Therefore, the units of the rate constant are\(M^-^1s^-^1\).

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Expressing this answer in scientific notation, the amount of N2 produced according to the engineer's design would be approximately 1.467 x 10^1 mol.

To determine the amount of N2 produced in the reaction between dinitrogen tetroxide (N2O4) and excess hydrazine (N2H4), we need to consider the stoichiometry of the reaction.

The balanced equation for the reaction is:

N2H4 + N2O4 → N2 + 2H2O

According to the stoichiometry of the reaction, for every one mole of N2H4, one mole of N2 is produced. The molar mass of N2H4 is approximately 32.05 g/mol.

Given that the rocket is designed to hold 1.35 kg (1350 g) of N2O4, we can calculate the moles of N2H4 required:

Moles of N2H4 = Mass of N2O4 / Molar mass of N2O4

Moles of N2H4 = 1350 g / 92.01 g/mol ≈ 14.67 mol

Since the stoichiometry is 1:1, the amount of N2 produced will be equal to the moles of N2H4:

Moles of N2 produced = Moles of N2H4 ≈ 14.67 mol

Expressing this answer in scientific notation, the amount of N2 produced according to the engineer's design would be approximately 1.467 x 10^1 mol.

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Step 1

The reaction:

Ca(OH)2 (aq) + 2 HBr (aq) => CaBr2 (aq) + 2 H2O (l) (compelted and balanced)

----------------

Step 2

Information provided:

0.0105 M HBr

125 mL of 0.0100 M Ca(OH)2

----------------

Step 3

The number of moles of Ca(OH)2:

Molarity (mol/L) = moles of Ca(OH)2/volume of the solution (L)

Volume = 125 mL x (1 L/1000 mL) = 0.125 L

Therefore,

Molarity x volume (L) = moles

0.0100 mol/L x 0.125 L = 1.25x10^-3 moles of Ca(OH)2

-----------------

Step 4

The number of moles of HBr, by stoichiometry:

Ca(OH)2 (aq) + 2 HBr (aq) => CaBr2 (aq) + 2 H2O (l)

1 mol Ca(OH)2 ------ 2 moles HBr

1.25x10^-3 moles ------ X

X = 1.25x10^-3 moles x 2 moles HBr/1 mol Ca(OH)2

X = 2.5x10^-3 moles HBr

----------------

Step 5

The volume of HBr needed:

Molarity = moles of HBr/volume of solution (L)

Volume = moles of HBr/molarity

Volume = 2.5x10^-3 moles HBr/0.0105 mol/L

Volume = 0.238 L

Volume = 0.238 L x (1000 mL/1 L) = 238 mL

Answer: 238 mL or 0.238 L (there are no matches)

Answer: Crystals are formed by the earth and the earth itself otherwise then its a fake crystal

Explanation:

Every crystal that exists was formed when earth was formed. Take diamonds for example, All diamonds were crushed for millions of years by the earth and that's why they are so valuable. All diamonds are just coal.

So your answer is no but fake crystals yes

Based on Lana's diagram, the correct statement that explains the results of asexual reproduction is C. The offspring are genetically identical to the parent, because each offspring receives a complete copy of a single parent's chromosomes.

In the diagram, the parent cell divides into two identical daughter cells, each of which contains a complete copy of the parent cell's genetic material.

This type of reproduction, where a single parent produces offspring that are genetically identical to itself, is called asexual reproduction. It is the process by which many unicellular organisms, such as bacteria and some protists, reproduce.

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Glycine is the N-terminal residue and Serine is the C-terminal residue.

From the given polypeptide Gly-Tyr-Gly-Phe-Met-Ser, the correct statements are:

Glycine is the N-terminal residue: This is correct because glycine is the first amino acid in the sequence, making it the N-terminal residue.

Serine is the C-terminal residue: This is correct because serine is the last amino acid in the sequence, making it the C-terminal residue.

Methionine is the N-terminal residue: This statement is incorrect. Although methionine is present in the sequence,

it is not the first amino acid. Glycine is the first amino acid, so it is the N-terminal residue.

Therefore, the correct statements are:

Glycine is the N-terminal residue.

Serine is the C-terminal residue.

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Answer:

Fossil energy has been a fundamental driver of the technological, social, economic and development progress which has followed.In 2019, around 84% of global primary energy came from coal, oil and gas. Over the coming decades we need to rapidly reduce this share by displacing them with low-carbon energy sources.Fossil energy has been a fundamental driver of the technological, social, economic and development progress which has followed.In the sections above we looked at the consumption of fossil fuels collectively. But it’s important to look at the role of coal, oil and gas individually – their impacts are not equal. Coal, for example, typically produces more CO2 and local air pollution per unit of energy.There would be more research on the use of alternate fuels.Moreover, fossil fuels are composed primarily of carbon and hydrogen atoms. On combustion they produce carbon dioxide, sulfur dioxide, and carbon monoxide as the main by-products.Solar energy can only be captured during daylight hours.

Explanation:

if you write this then you will get full marks in your assignment it is valied for up to 16 class I don't know about any further it I have mixed many iconic and logic facts that are imp in science!

The quantity of water that are required to be mixed with 11. 75 g of hgcl in order to make a 0. 01 m solution is: 4970 g

In chemistry a solution is known as a homogeneous mixture of two or more components called:

To solve this molality problem, the formulas and the procedures that we have to use are:

Where:

Information about the problem:

Applying the mole (n) formula we get:

n(hgcl) =  11.75 g /236.04 g/mol

n(hgcl) = 0.0497 mol

Applying the molality formula, and clearing the m(solvent) we get:

m(solution) = n(solute)/m(solvent)

m(H2O)= 0.0497 mol /0.01 m

m(H2O)= 4.97 kg

Converting the mass units from (kg) to (g) we have:

m(H2O)= 4.97 kg * (1000 g/1kg)

m(H2O)= 4970 g

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Answer:

solvent

Explanation:

Water dissolves the substances, which become the solutes in the solution.

\( \huge\begin{gathered} {\underline{\boxed{ \rm {\red{Bài\:giải}}}}}\end{gathered}\)

Dòng điện chạy qua một hợp chất hóa học gây ra sự phân hủy hợp chất đó được gọi là sự điện phân. Trong quá trình điện phân, các ion mang điện tích dương di chuyển về phía cực âm và

The water retained by some salts when isolated by evaporation is called water of hydration. Salts that contain water of hydration are called hydrates.

Water of hydration is also called water of crystallization. It is the water that remains inside the framework of the salt or crystal after evaporation and can only be removed by heating, but by doing this, one risks losing the structure of the crystal.

An example of a hydrate is copper tetraoxosulphate (VI). When hydrated, it becomes copper tetraoxosulphate (VI) pentahydrate. When it is without its water of hydration, it has a white colour but when it is hydrated, it is blue in colour.

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Answer: A

Explanation:

The statement which is correct about the separation techniques is as follows:

Thus, the correct option for this question is A.

The Separation techniques may be defined as all those techniques that can be utilized in order to separate two different states of matter such as liquid and solid from one another.

Physical separation techniques may include magnetic attraction, filtration, evaporation, chromatography, centrifugation, etc. Chemical separation techniques may include distillation, adsorption, oxidation, crystallization, membrane procedures, etc.

Compounds can be separated into their constituents by chemical separation techniques. Evaporation is used to eliminate water from liquid food products and make them dry. Desalination may be defined as a process of eliminating salt from sea water specifically.

Therefore, the correct option for this question is A.

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Answer:

Given

Number of moles = 0.5

Temperature = 293 K

Volume in which gas is trapped = 2 litre

From ideal gas law,

PV = nRT

where R is the universal gas constant, R = 0.08206 L.atm/mol

So putting the value in the ideal gas equation,

P *(2) = (0.5)*(0.08206 )(293)

P = (0.5)*(0.08206 )(293)/(2)

P = 12.02179/2

P = 6.01 atm ≈ 6.0 atm (approx)

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Answer:

Because of the earths rotation

Explanation:

But it appears to rise and set because of the Earth's rotation on its axis. It makes one complete turn every 24 hours. ... As the Earth rotates toward the east, it looks like the sun is moving west. As the Earth rotates, different locations on Earth pass through the sun's light.

Answer:

When the earth is rotating, it is rotating away and towards the sun which is why we have day and night

Explanation:

Answer:

its c ma man .

This is the other ray that will make up the angle ∠AYZ and will complete the constructioExplanation:

if your taking the quick check these were my awnsers

1.c

2.b

3.d

4.c

5 .A

for the copying an angle quick check only