R stereocenters have a substituent priority that rotates {{c1::clockwise}}

Answer:

m = 46593.6 g

Explanation:

Given data:

Mass of mercury = ?

Volume of mercury = 3426 mL

Density of mercury = 13.6 g/mL

Solution:

Formula:

d = m/v

d = density

m = mass

v = volume

by putting values,

13.6 g/mL = m/ 3426 mL

m =  13.6 g/mL × 3426 mL

m = 46593.6 g

In an addition reaction to an alkene, when one or more stereogenic centers are produced, the product is always formed as a racemic mixture because both enantiomers are formed in equal amounts.

This occurs due to the planar geometry of the alkene's double bond, which allows the reactants, such as carbenes, to approach from either side, resulting in both R and S configurations.

Carbenes, which are highly reactive, are frequently produced by α-elimination reactions, where the proton being lost and the leaving group are in close proximity. This leads to the formation of a racemic mixture as the carbene attacks the alkene's double bond from either face, generating the stereogenic centers.

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Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions.

Matter cannot be created or destroyed in chemical reactions. This is the law of conservation of mass. In every chemical reaction, the same mass of matter must end up in the products as started in the reactants. Balanced chemical equations show that mass is conserved in chemical reactions

No, it does not pass the "fat pencil" test. Therefore, a normal distribution is not a reasonable model. Option B is the correct answer.

The "fat pencil" test is a quick visual check to determine if a dataset can be reasonably approximated by a normal distribution. In this case, the pH readings of wastewater show a significant deviation from a normal distribution. The presence of several low pH values (1.0) and a few high pH values (10.0, 10.5, 11.4) indicate a non-normal distribution with skewness and potential outliers. Therefore, it is not reasonable to model these data using a normal distribution.

Option B is the correct answer.

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The cell potential is 0.94 V.

To find the cell potential of the given cell, we can use the standard reduction potentials from a table.

The half-reactions are:

\(Ag^+ + e^- → Ag E° = +0.80 V\)

\(Sn^2^+ + 2e^- → Sn E° = -0.14 V\)

The overall cell potential (Ecell) can be calculated as sown below.

Ecell = E°cathode - E°anode

Ecell = (+0.80 V) - (-0.14 V)

Ecell = +0.94 V

Therefore, the cell potential of the given cell is +0.94 V.

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Answer: 30.7 moles

Explanation:

Answer:

- Because it could lead to rise in sea levels which could cause heavy floods in the Small Island States and thus destroy their economies.

Explanation:

The reason is that too much carbon dioxide emissions trapped in the atmosphere can cause global worming which includes climate change and rise in sea levels.

Now, due to the fact that we know islands are lands surrounded by water, a rise in sea level of by as small as 1 metre could be very dangerous to these small islands in that they could cause them to become flooded and thus cause harm to lives and properties thereby damaging their economies.

The government is being pressured by environmentalists to require modifications to bus exhaust systems due to concerns about sulfur dioxide in the air.

In this situation, environmentalists are expressing their concerns about sulfur dioxide pollution in the air and advocating for stricter regulations on bus manufacturers to modify their exhaust systems.

Sulfur dioxide is a harmful air pollutant that is primarily released from burning fossil fuels, particularly in vehicles and industrial processes. It is known to contribute to respiratory problems, acid rain formation, and environmental degradation.

By pressuring the government to enforce modifications in bus exhaust systems, environmentalists aim to reduce sulfur dioxide emissions from buses, which can significantly contribute to air pollution in urban areas.

These modifications may involve the installation of advanced pollution control technologies such as catalytic converters or particulate filters to minimize the release of harmful pollutants, including sulfur dioxide.

The action taken by environmentalists and the government's response demonstrate a proactive approach towards addressing environmental concerns and promoting cleaner and healthier air quality for the community.

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The reasonable ground - state electron configuration is 1s² 2s²2p⁶

1) Electron configuration is defined as the arrangement of electron in the atomic orbtials.

2)The ground state electron configuration is lowest energy level and have most stable arrangement.

3) An excited state configuration is a higher energy level.

4) According to Aufbau principle ., electrons will occupy the orbitals of lower energies first then occupying higher energy orbitals.

5) Energy of orbitals is calculated by the sum of principle quantum number and azimuthal quantum numbers.

6) The rule of electron filling in the orbital is from lower energy level to higher energy level.

7) According to this rule electrons are filled in the order of 1s 2s 2p 3s 3p 4s 3d 4p 5s ........and so on.

8) According to pauli principle , maximum two electrons, having opposite spin can fit in orbital.

9) According to Hund's rule , orbital in given sub-shell is singly occupied by electrons before filling second electron in an orbital.

10) The ground state configuration is the arrangement of electron around the nucleus of an atom with lower energy levels.

Hence,The reasonable ground-state electron configuration is 1s² 2s² 2p⁶

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The molar masses of Mg and Fe are:

Magnesium oxide:

Mass of oxygen = 1

Mass of magnesium = 1.5

Molar mass of magnesium = (1.5 / 1) × 16 = 24

Iron oxide:

Mass of oxygen = 1

Mass of iron = 3.5

Molar mass of iron = (3.5 / 1) × 16 = 52

The accepted molar masses of Mg and Fe are 24.305 g/mol and 55.845 g/mol, respectively. The values I obtained are slightly different from the accepted values, but the difference is within experimental error.

There are a few possible reasons for the differences between the values obtained and the accepted values. One possibility is that the compounds used were not pure. Another possibility is that an error was made in calculations. Finally, it is also possible that the accepted values are not accurate.

To account for the differences, repeat the experiment with more accurate measurements and a purer sample of the compounds. Also check the accepted values to make sure they are accurate.

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Answer: C

Explanation: Because I just did the test lol.

Chemicals are substances that can be natural or man-made. It can both hurt and help the environment as they pollute water and can also clean water. Thus, option C is correct.

Chemicals are compounds that are synthesized artificially and have various uses and applications in various fields. They can be both beneficial and detrimental to the environment and the ecosystem.

Chemicals like that from factories, pesticides run-off from agricultural fields, drugs, microorganisms, fertilizers, radioactive substances, etc, cause water pollution by acting as contaminants.

On the contrary, chemicals can be used to clean water pollution. Chloramine and chlorine are the most common chemical disinfectants that cleanse contaminated water to make it useful.

Therefore, option C. chemicals can both clean and pollute water.

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Answer:

1

4

5

6

Explanation:

all magnets have opposite poles (north and south)

magnetic domains are aligned

moving electrons generate a magnetic filed

movement of electrons creates a magnets field

attracted to iron, nickel and cobalt

The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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Answer:

The hydrophobic core of the globin fold favors heme binding, but it is the proximal F8 (helix F, position 8) histidine that actually binds the heme cofactor to the protein by coordinating to the heme iron's fifth coordinate. Gaseous ligands bind to the iron's sixth coordinate at the opposite side of the heme plane.

Answer:

hope it helps u

Answer:

its 2nacl +br2.

hope it will help uh..

Answer: A-Nebulae can form stars, comets cannot

Explanation: Simply comets get destroyed and Nebulae are often star-forming regions, such as in the "Pillars of Creation" in the Eagle Nebula. In these regions, the formations of gas, dust, and other materials "clump" together to form denser regions, which attract further matter, and eventually will become dense enough to form stars.

While Nebulae is a body of interstellar cloud, made of cosmic dust, hydrogen etc , Comets are balls of rocks, frozen gases, that revolve the Sun.

Nebulae can form stars, but comets cannot. Option A is correct

Nebulae is a different body of interstellar cloud, they are made out of cosmic dust, hydrogen, helium, and molecular clouds.

While Comets are balls of rock, frozen gases, and other particles that revolve around the Sun.

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If 20. 3 grams of an aqueous solution of iron(ii) chloride contains 2. 71 grams of iron(ii) chloride, then percentage by mass of  iron(ii) chloride in the solution is 13.34%

Calculation,

Given:

mass of an aqueous solution of iron(ii) chloride = 20. 3 grams

mass of iron(ii) chloride = 2. 71 grams

The percentage by Mass is equal to percentage of mass of solute present in total mass of solution. It is also known as Mass percentage.

percentage by Mass = 100× 2. 71 grams/20. 3 grams = 13.34%

Hence, the percentage by mass of  iron(ii) chloride in the solution is 13.34% .

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Answer: 215.0%

Explanation:

Answer:

b because  i said so

Explanation:

Since the breakdown of hydrogen peroxide can cause a reduction in concentration and potency over time, it is a good idea to check the concentration of hydrogen peroxide that has been exposed to air and light.

The chemical student employed titration with potassium permanganate to measure the quantity of hydrogen peroxide.

Using this technique, the volume of potassium permanganate solution needed to completely react with the hydrogen peroxide sample is measured after adding a known quantity of a standard potassium permanganate solution to the hydrogen peroxide sample until the reaction is complete.

Hydrogen peroxide and potassium permanganate react in the following way: 5 H2O2 + 2 KMnO4 + 3 H2SO4 5 O2 + 2 MnSO4 + K2SO4 + 8 H2O

The amount of hydrogen peroxide in the sample may be determined from the volume and concentration of the potassium permanganate solution used in the titration because the reaction uses 5 moles of hydrogen peroxide for every 2 moles of potassium permanganate.

The chemical student should carry out the following procedures to examine the hydrogen peroxide samples in dark and light vials that have been exposed to air for 10, 20, and 30 hours:

1. Make a standard potassium permanganate solution with a known concentration.

2. Pour a known volume of each test sample of hydrogen peroxide into a flask.

3. To serve as a catalyst for the reaction, add a tiny quantity of diluted sulfuric acid to the hydrogen peroxide sample.

4. Continue titrating the hydrogen peroxide sample with the potassium permanganate standard solution until the reaction is finished, which is shown by a lingering pink hue of the potassium permanganate solution.

5. To confirm the correctness of the results, repeat the titration using the same sample.

6. Using the volume and concentration of the potassium permanganate solution used in the titration, determine the concentration of hydrogen peroxide in the sample.

The chemical student can find out if the exposure to air and light has changed the concentration of hydrogen peroxide over time by analysing the concentration of hydrogen peroxide in the light and dark vials after 10, 20, and 30 hours.

The findings may be calculated by comparing them to the original concentration of 3% by weight.

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Answer:

9.1g

Explanation:

Given parameters:

Mass of copper sulfate heptahydrate  = 43.2g

Mass of water lost  = 34.1g

Unknown:

Mass of copper sulfate = ?

Solution

The copper sulfate heptahydrate is made up of the copper sulfate and water of crystallization which makes it wet.

Mass of copper sulfate heptahydrate  = mass of copper sulfate + mass of water

Mass of copper sulfate = mass of copper sulfate heptahydrate - mass of water

Mass of copper sulfate = 43.2g  - 34.1g = 9.1g

The mass of copper sulphate that is produce from a wet 43.2 g sample of copper sulphate heptahydrate that is heated until only copper sulphate remains (mass of water lost is 34.1 g)  is 9.1 grams.

Using the law of conservation of matter, the mass of the reactant is equals to the mass of the product.

Therefore,

CuSO₄7H₂O → CuSO₄ + 7H₂O

mass of CuSO₄7H₂O = 43.2 g

mass of CuSO₄ = x

mass of H₂O = 34.1 g

mass of  CuSO₄ = 43.2 - 34.1

mass of  CuSO₄ = 9.1 g

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Answer:

B

Explanation:

a chemical change is something that can not be reversed, so you may think crushing a rock but it isn't because crushing a rock is a phisical change not chemical and if you freeze water you can melt it and of you melt ice you can freeze it, so those can be reversed. So the answer is B because that can not be reversed

Since new substances are formed in chemical changes, Lighting a Match is a chemical change., option B.

A chemical change refers to a change which is not easily reversible and in which new substances are formed.

In chemical changes, large amounts of heat is involved and changes in the mass of the original substance may occur.

Examples of chemical changes are combustion of substances, oxidation of substances, etc.

From the given options, the change which involves great heat changes and in which new sure are formed is Lighting a match.

Therefore, Lighting a match describes a chemical change, option B.

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Answer:

Explanation:

It is called a single replacement. K is one of the few chemicals that can force Aluminum to take on electrons. The balanced equation is

AIBr3 +3K → 3KBr + AI

Answer:    Single Displacement (Substitution)

Explanation:

Aluminum Bromide + Potassium = Potassium Bromide + Aluminum

Explanation:

Here is why: If the atmosphere contains too much of these gases, the whole Earth becomes a hotter and hotter greenhouse. The atmosphere holds onto too much of the heat at night instead of letting it escape into space. Then, the next day, the Sun heats Earth's surface even more.

Molecular mass :To find the molecular mass, add the atomic masses of all of the atoms in the molecule.

The molecular mass of a monomer unit is:

C₂H₃Cl = 2×12.01 + 3×1.008 + 35.45 = 24.02 + 3.024 + 35.45 = 62.494 u

For 1565 units,

Molecular mass = 1565 units x 62.494 u/ 1 unit  = 9.780 x 10^4 u

the molecular mass (in amu ) of the chain is 9.780 x 10^4  u

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The soda water didn't freeze because of the depression in freezing point as compared to the water.

When a solute is added to a pure solvent , then the value of freezing point is reduced.

The decrease in the freezing point is directly proportional to the molality of the solute.

It is given in the question that

A student put a bottle of water and a can of sugared soda in the freezer to chill them quickly.

when she took them out, the bottle of water was frozen but the can of soda was not.

It is because water is the pure solvent , so freezing point is fixed but the soda water has sugar and Carbon Di oxide along with the solvent water , the presence of the sugar and Carbon -di-oxide decreases the freezing point of the soda water and so it doesn't freezes.

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