select the option that places remaining contributors in the correct order, from highest to lowest according to the percentages of greenhouse gases they emit.

False. A prochiral center does not describe an sp_3 hybridized atom that can become a chirality center by changing one of its attached groups.

A prochiral center is an atom that possesses chirality, meaning it can become a chirality center by changing its stereochemistry. However, the statement in question is incorrect because a prochiral center does not require changing one of its attached groups to become a chirality center.

In contrast, a prochiral center is a type of stereocenter that exhibits chirality due to the presence of two different groups attached to it. It becomes a chirality center when one of the groups is replaced by another group, resulting in the formation of two distinct stereoisomers.

An example of a prochiral center is a carbon atom with three different groups attached to it. Upon substitution of one of the groups, the prochiral center becomes a chirality center, giving rise to enantiomers.

Therefore, the statement that a prochiral center can become a chirality center by changing one of its attached groups is false.

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Answer:

The energy produced by the sun is as a result of nuclear reactions which produces large amounts of energy.

Explanation:

Chemical reactions are reactions which occur as a result of a rearrangement of atoms of elements to form new combinations of substances known as compounds.

Since chemical reactions which have relatively short lifespans, scientist would have assumed that the sun is very young.

However, nuclear reactions have been proven to be the means by which the sun produces its energy.

Nuclear reactions release large amounts of energy and have relatively long lifespans.

Therefore, the energy produced by the sun is as a result of nuclear reactions.

We already know that the Sun emits energy through a process called nuclear fusion. Nuclear fusion can occur when the protons of hydrogen atoms collide in the Sun's core to make helium atoms. This can also be called PP, or proton-proton chain reaction. Our Sun is currently 4.6 billion years old, but early scientists believed the Sun to have been made when a huge cloud of gas and particles (also known as a nebula) collapsed under the force of its own gravity. This is known as the Nebula Theory.

Answer: The limiting reactant is Na

Explanation:

To prepare a final solution of 20 cc with 1% lidocaine and epi 1:150,000, you would need to combine 0.13 cc of 4% Xylocaine, 5 cc of 1:1000 epi, and 14.67 cc of diluent (such as saline) in the final solution.

To calculate the required amounts of each component, we need to consider the desired concentrations and the available concentrations of the drugs.

Desired concentration of lidocaine = 1%

Desired concentration of epi = 1:150,000

Volume of the final solution = 20 cc

the desired amount of lidocaine in the final solution is:

(1/100) * 20 cc = 0.2 cc

Next, let's calculate the amount of epi needed:

1:150,000 epi means there is 1 part of epi in 150,000 parts of the solution. So the desired amount of epi is:

(1/150,000) * 20 cc = 0.0001333 cc (approximated to 0.13 cc)

Since the available concentration of epi is given as 1:1000, which means there is 1 part of epi in 1000 parts of the solution, we can directly take 0.13 cc from the vial

To determine the amount of 4% Xylocaine needed, we can use the equation:

(amount of drug) / (final volume) = (desired concentration) / (available concentration)

(amount of Xylocaine) / 20 cc = 1% / 4%

(amount of Xylocaine) = (20 cc) * (1% / 4%) = 5 cc

Finally, the remaining volume of the final solution should be made up of a diluent, such as saline, to reach the total volume of 20 cc:

(amount of diluent) = (20 cc) - (0.2 cc + 0.13 cc + 5 cc) = 14.67 cc

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shell3=2×3^2=18

shell one =2

shell 2=8

2+8+18=28

28 electron all together one the 3rd shell

35-28=7

7 electrons on the 4th shell

In bromine's n=4 shell, we have a a total of 2 + 5 = 7 electrons.

In bromine's (atomic number 35) electron configuration, the next outer shell after the third shell (n=3) is the fourth shell (n=4).

We will subtract the total number of electrons in the previous shells, in order to determine the number of electrons in the n=4 shell

The electron configuration of bromine (Br) is:

\(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^5\)

We then count the electrons in the n=4 shell, we consider the electrons in the 4s and 4p subshells.

In the 4s subshell, we have  2 electrons (\(4s^2\)).

In the 4p subshell, there are 5 electrons (\(4p^5\)).

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Answer:

Evaporation

Explanation:

Water at the surface of the ocean rivers and lakes can become water vapor and move into the atmosphere with a little added energy from the Sun through a process called evaporation. Snow and ice can also become water vapor through a process called sublimation. See also why do variations in generation time exist

Answer:   Graphite is nonpolar carbon which associates with the nonpolar hexanes. The cellulose in the exposed paper contains polar regions that are attracted to the polar water.

Explanation:

CSS3 introduces a new type of color notation, the rgba and hsla values. The rgba value stands for 'red, green, blue, alpha' and specifies a color with an alpha channel which is used to control the opacity of the color.

The hsla value stands for 'hue, saturation, lightness, alpha' and allows you to specify a color in terms of its hue, saturation, lightness and alpha. Using these two color notation types, you can create more vibrant, visually captivating web designs.

You can also create color gradients and transparencies which were difficult to achieve before. With rgba and hsla, you can easily mix and match colors to create the exact design you have in mind. They provide an excellent way to customize the look and feel of a website and make it truly unique.

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Explanation:

(1) The mechanism of the reaction between propene and hydrogen bromide to give 2-bromopropane is as follows:

Protonation of the alkene: A proton from hydrogen bromide (HBr) attacks the alkene, forming a carbocation intermediate.

Bromine addition: Bromine (Br) adds to the carbocation intermediate to form an intermediate bromonium ion.

Deprotonation: A proton from the bromonium ion is removed by a water molecule or another molecule, producing the final product 2-bromopropane.

The mechanism can be represented using curly arrows as follows:

H,C

H

c=c

H

H

H-Br

CH, H

H-C-C-H

Br H

CH, H

1 1

H-C-C-H

Br H

2-bromopropane

(2) 2-bromopropane is the main product of this reaction because of the stereochemistry of the reaction. When the carbocation intermediate forms, the bromine atom has a preference for adding to the face of the alkene that has the least number of hydrogen atoms. This leads to the formation of the 2-bromopropane, which has the bromine atom attached to the carbon atom with two hydrogen atoms. On the other hand, the formation of 1-bromopropane, which has the bromine atom attached to the carbon atom with three hydrogen atoms, is less favorable. This is why 2-bromopropane is the main product of this reaction.

Answer:

23.8g

Explanation :

Convert 2.0M into mol using mol= concentration x volume

2.0M x 0.1L (convert 100mL to L since the units for M is mol/L)

= 0.2 mol

We can now find grams by using the molar mass of KBr

=119.023 g/mol (Found online) webqc.org

but can be be calculated by using the molecular weight of K and Br found on the periodic table

We can now calculate the grams by using grams=mol x molar mass

119.023g/mol x 0.2mol

= 23.8046 g

=23.8g (rounded to 1decimal place)

When a nonmetal bonds with a nonmetal, a covalent bond is involved. Details about non-metals can be found below.

A nonmetal is an element, such as phosphorus or chlorine, that does not have the chemical or physical properties of a metal.

A metal is known to lose or donate electrons when it goes into a reaction, hence, an electrovalent bond is usually formed.

However, a nonmetal is known to accept or gain electrons when it goes into reactions. This means that when two nonmetals bonds in a chemical reaction, a covalent bond is formed between them.

Covalent bond is a type of chemical bond where two atoms are connected to each other by the sharing of two or more electrons.

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Answer:

Explanation:chlorine

Explanation:

please mark me as brainlest

(a) The speed of light in the unknown substance is determined 1.82 x 10⁸ m/s.

(b) The light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.

The speed of light passing from air into the substance is calculated as follows;

refractive index = speed of light in air / speed of light in the substance

speed of light in the substance = speed of light in air/refractive index

speed of light in the substance = (3 x 10⁸) / (1.65)

speed of light in the substance = 1.82 x 10⁸ m/s

Thus, the light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.

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Answer:

Q1: A

Q2: B

Explanation:

Q1: the independent variable will always go on the x axis and the dependent will always go on the y-axis, so the answer is A.

Q2: it's not a, it's not d (ocean droughts aren't a thing that I'm aware of), and hurricanes don't make water scarce, so I would go with B.

The branch of science which deals with chemicals and bonds is called chemistry.

The correct answer to the question is A, B and A

In the question, there are 3 multiple choice questions on the water security topic.

The answer to the first question is A because the information of the graphs depends on the variable and the invariable factors.

The answer to the second question is B because the water level depends on give climate change, and water pollution, These two factors are majorly given information about the water level.

The answer to the third question is A because the amount of water on the earth is not constant and change according to the requirement.

Hence, the correct answer to the question is A, B, and A.

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In a liquid-liquid extraction (LLE) system with loratadine and pseudoephedrine sulfate, the choice of organic and aqueous phases is crucial for efficient separation.

Loratadine is a non-polar compound, while pseudoephedrine sulfate is more polar due to the presence of a sulfate group. To achieve effective separation, we need to choose a suitable organic phase and aqueous phase.

For the organic phase, a non-polar solvent such as diethyl ether, ethyl acetate, or chloroform can be used. These solvents have good solubility for loratadine. The non-polar organic phase will extract loratadine from the mixture, allowing for separation from the aqueous phase.

As for the aqueous phase, we need to choose a polar solvent that will selectively extract pseudoephedrine sulfate. Aqueous solutions of acids like hydrochloric acid (HCl) or sulfuric acid (H2SO4) can be used. The acidic conditions protonate the pseudoephedrine sulfate, making it more soluble in the aqueous phase.

To perform the extraction, the mixture of loratadine and pseudoephedrine sulfate is added to the LLE system consisting of the organic phase (non-polar solvent) and the aqueous phase (acidic solution). The mixture is then vigorously shaken to ensure thorough mixing and extraction.

After shaking, the phases are allowed to separate, with the more dense aqueous phase settling at the bottom and the less dense organic phase on top. The layers can be carefully separated, and each phase can be further processed to isolate the desired compounds.

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The exact volume of peroxide is needed to be added because it is helpful in knowing about the concentration of the analyte similarly water also should be added knowing its exact volume as it improves the accuracy of the answer required.

a) It is important to know the exact volume of peroxide to be added to the flask in order to ensure that the correct amount of peroxide is used in the reaction and that the reaction has the desired outcome.

By knowing the exact volume of peroxide, the chemist can also ensure that there is no excess peroxide that could cause a dangerous reaction. Additionally, if the correct amount of peroxide is not used, the reaction may not occur correctly or may yield unwanted products. Knowing the exact volume of peroxide also helps the chemist control the reaction rate and the desired product yields. Finally, using the correct amount of peroxide can help prevent contamination of the reaction mixture.

b) It is necessary to know the exact volume of water to be added to the flask for a number of reasons. First, accurate measurement of volume helps to ensure the accuracy of the results from the experiment. If too much or too little water is added, it can skew the results or cause the experiment to fail.

Second, the volume of water will affect the rate of temperature change. If too little or too much water is added, the temperature change may not be as dramatic as desired, or it may take too long to reach the desired temperature.

Finally, the volume of water will affect the amount of energy required to heat the water up. If too much water is added, it can take a long time and require a lot of energy to heat the water to the desired temperature. Knowing the exact volume of water to be added to the flask is critical to ensure the experiment is successful and the results are accurate.

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The change that wilL occur is that the the reaction shifts to the right (products) to produce fewer moles of gas.

option C is correct.

The balanced equation is:

\(51.8 kJ + H_2(g) + 12(g) = 2HI(g)\)

From the left, there are 1 mole of H2 gas and 1 mole of I2 gas, which gives a total of 2 moles of gas.

In the right,  there are 2 moles of HI gas.

We can tell that there are more moles of gas on the left side than on the right side by comparing the amount of moles on each side.

According to Le Chatelier's principle, a decrease in volume will favor the side with fewer moles of gas.

In our scenario, the reaction will shift to the right  to produce fewer moles of gas.

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Answer:

there is no change

Explanation:

acellus correct

i think Neuterons i am right

Answer:

I do not know srry

Explanation:

Answer:

Explanation: The invention of the microscope led to the discovery of the cell by Hooke. While looking at cork, Hooke observed box-shaped structures, which he called “cells” as they reminded him of the cells, or rooms, in monasteries. This discovery led to the development of the classical cell theory.

Answer:

Microscopes help see cells up close and if you have for example a Disease they and see what it looks like up close on you cells and discover what it is

At 127°C, the entire sample of 1 is observed to have vaporized. The mass is the same since the number of each type of atom in the vessel is constant. Therefore, option B is correct.

At 127°C, when the entire sample of substance 1 has vaporized, it means that all the substance has transitioned from the liquid phase to the vapor phase.

In this phase transition, the individual atoms or molecules of the substance remain the same, but they are now in the gaseous state instead of the liquid state.

Therefore, the total mass of vessel 5, which contains substance 1, will remain the same before and after the vaporization process.

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Answer:

Ferric oxide reacts with aluminium to produce aluminium oxide and iron. The balanced chemical equation for the given reaction is : Fe2O3 + 2Al → Al2O3 + 2Fe.

percent yield = 2337%. The formula weight of alum, KAl(SO4)2·12H2O can be calculated by adding the atomic weights of all the elements present in the compound.

Here's the calculation:
K = 39.098 g/mol
Al = 26.982 g/mol
S = 32.065 g/mol (x 2 = 64.130)
O = 16.00 g/mol (x 12 = 192.00)
H = 1.008 g/mol (x 24 = 24.192)
Formula weight of alum = 39.098 + 26.982 + 64.130 + 192.00 + 24.192 = 346.402 g/mol
For the per cent yield, we'll first determine the theoretical yield of alum:
0.4754 g Al × (1 mol Al / 26.982 g Al) × (1 mol alum / 1 mol Al) × (346.402 g alum / 1 mol alum) = 6.0961 g alum (theoretical yield)
Now, we can calculate the per cent yield using the recovered alum mass:
Per cent Yield = (Recovered Alum Mass / Theoretical Yield) × 100
Percent Yield = (5.3287 g / 6.0961 g) × 100 = 87.4%
So, the per cent yield of the experiment is 87.4%.

The formula weight of alum, KAl(SO4)2-12H2O, is 474.39 g/mol (according to the MSDS source).
To calculate the per cent yield of the experiment, we need to use the following formula:
percent yield = (actual yield / theoretical yield) x 100%
The theoretical yield is the amount of alum that should be produced based on the amount of aluminium used in the experiment. We can calculate the theoretical yield using stoichiometry:
2 Al + K2SO4 + 2 H2SO4 + 24 H2O → KAl(SO4)2-12H2O + 3 H2
From this equation, we can see that 2 moles of aluminium react to produce 1 mole of alum. Therefore, the theoretical yield of alum is:
theoretical yield = (5.3287 g / 474.39 g/mol) x (2 mol Al / 1 mol alum) x (26.98 g/mol Al) = 0.2277 g
Now we can calculate the per cent yield:
percent yield = (5.3287 g / 0.2277 g) x 100% = 2337%
This is an unrealistic per cent yield, likely due to an error in measurement or calculation. It is important to always check and double-check calculations to ensure accuracy in experimental results.

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Answer:

New volume of chlorine gas (V2) = 179 ml (Approx)

Explanation:

Given:

Volume of chlorine gas (V1) = 193 ml

Temperature of chlorine gas (T1) = 21°C = 21 + 273 = 294 k

New temperature of chlorine gas (T2) = 0°C = 0 + 273 = 273 k

Find:

New volume of chlorine gas (V2) = ?

Computation:

Using charle's law

V1 / T1 = V2 / T2

193 / 294 = V2 / 273

V2 = 179.21

New volume of chlorine gas (V2) = 179 ml (Approx)

The word "however" from the passage from Sue Macy's book Wheels of Change denotes a shift in strategy. As a result, Option D is the appropriate statement.

What does Wheels of Change's theme entail?

The narrative "Wheels of Change" has as its central message that you should no longer be frightened to speak up for yourself and other people. This was demonstrated as girls' racing gained popularity.

Cycling has gotten more violent, and males have developed a strong concern about girls getting their rights. The Springfield Bicycle Club was established in 1881. While giving back to the community, Wheels of Change empowers citizens, boosts self-esteem, AND offers worthwhile transitional work. For $13/hour, Wheels of Change offers temporary jobs to people staying at the Temporary Bridge Shelter program run by Alpha Project.

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The identity of the spot visualized under the lane of the developed TLC (Thin Layer Chromatography) plate depends on the specific compound or mixture of compounds being analyzed.

TLC is a technique used to separate and identify different components in a mixture based on their relative affinity for a stationary phase (the TLC or Thin Layer Chromatography plate) and a mobile phase (the solvent).

The TLC plate is coated with a thin layer of an adsorbent material such as silica gel, and the mixture is spotted onto the plate. The plate is then placed in a container with the mobile phase, which moves up the plate through capillary action, carrying the components of the mixture with it.

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The statement can be called using scope resolution operator.

Assuming that the showTotal() function is defined inside the Numbers class, the statement to call the function would be:

Numbers::showTotal();

The :: is the scope resolution operator, which is used to specify the namespace or scope of a function or variable. In this case, it specifies that the showTotal() function is a static member of the Numbers class. The function can be called without creating an instance of the class because it is declared as static.

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1. The complete electron configuration for the chromium atom (Cr, atomic number 24) is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵

2. Using NOBLE GAS notation, the electron configuration for the zinc atom (Zn, atomic number 30) is: [Ar] 4s² 3d¹⁰

3. The complete electron configuration for the potassium atom (K, atomic number 19) is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

4. Using NOBLE GAS notation, the electron configuration for the nitrogen atom (N, atomic number 7) is: [He] 2s² 2p³

5. The complete electron configuration for the vanadium atom (V, atomic number 23) is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d³

6. Using NOBLE GAS notation, the electron configuration for the scandium atom (Sc, atomic number 21) is: [Ar] 4s² 3d¹

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Answer:

Consider this reaction:

BaCl (aq) + MgSO4(aq) →

BaSO4(s) + MgCl2(aq)

(a) Name the reactants and products.

(b) Compare the states of the four chemicals.

(c) Name the product that remains dissolved

in water.

(d) Name the solid product.

Explanation:

Answer: The ratio of radii of earth to another planet is 2/3 and the ratio of their mean densities is 4/5. If an astronaut can jump to a maximum height of 1.5 m on the earth, with the same effort, the maximum height he can jump on the planet is

Explanation: