Which feature of a molecule can be determined from its NMR spectrum?

Explanation:

Desposition of solid matter in a solution

Bimolecular nucleophilic substitution (SN2) reactions are concerted reactions in which both the nucleophile and the substrate are involved in the rate-limiting step. Bonds are broken and new bonds are formed in a single step thanks to the coordinated nature of this reaction. In order to comprehend this reaction, it is essential to examine the transition state, which replicates the concerted rate-limiting step.

What is Hammond postulate?

The geometrical structure of the transition state of an organic chemical reaction is described by Hammond's postulate (also known as the Hammond-Leffler postulate), a physical organic chemistry hypothesis.

According to the postulate, which George Hammond first put forth in 1955, if two states, such as a transition state and an unstable intermediate, happen concurrently during a reaction process and have nearly the same amount of energy, their interconversion will only cause a slight reorganization of molecular structures.

Bimolecular nucleophilic substitution (SN2) reactions are concerted reactions in which the rate-limiting step involves both the nucleophile and the substrate. Due to the concerted nature of the reaction, the bonds are broken and new bonds are formed all in one step. It is crucial to examine the transition state, which resembles the concerted rate-limiting step, in order to interpret this reaction. The halide (L) bond is broken while the nucleophile forms a new bond with the carbon in the "Depiction of SN2 Reaction" figure.

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Diatoms are single-celled algae that have a silica (silicate) shell called a frustule.

Diatoms are photosynthetic organisms and are known for their intricate and diverse shapes. Diatoms are commonly found in freshwater and marine environments and play a significant role in the global carbon cycle.

Micrite is a fine-grained carbonate sedimentary rock composed of tiny carbonate particles. It forms through the precipitation and accumulation of carbonate minerals, such as calcite or aragonite, in marine environments. In the case of chalk, which is primarily composed of microscopic fragments of calcium carbonate from marine organisms, recrystallization can occur at the ocean bottom under specific conditions, leading to the formation of micrites.

Therefore, it's important to note that chert, marble, and quartzite are not the typical products of recrystallization of chalk at the ocean bottom.

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Answer:A, The Period Number

Explanation:

just took the test

Absolute zero is an idea in thermodynamics that describes the lowest energy system.

Thermodynamics

Thermodynamics is the study of thermal energy and heat. One of the most important ideas in thermodynamics is entropy. Entropy is defined as the chaos within a system. Chaos is the movement or different orientations of molecules in a system. Entropy is related to temperature; the higher the temperature, the higher the entropy. High entropy means there is a large amount of chaos in a system, while low entropy is low chaos.

Absolute zero

Absolute zero occurs when the temperature of a system is 0 kelvin or -273.15 °C. Zero kelvin is the theoretical temperature in which entropy equals 0. This means that there is no movement or energy within a system. Absolute zero is the lowest energy a system can possibly have.

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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Many of the elements on the periodic table will always form ions that have the same charge. The alkali metals (shown in yellow) always form +1 ions. The alkaline earth metals (red) always form +2 ions. The halogens (blue) always form -1 ions.

Answer:

the correct answer is 17

Answer:

Li2CO3+CaCl2=CaCO3+LiCl

The pH of the resulting solution containing 0.0002 moles of hydrogen ions and a total volume of 20.00 mL is approximately 2.30.

To calculate the pH of the resulting solution, we first need to determine the concentration of hydrogen ions (H+) in the solution.

Since there are 0.0002 moles of H+ ions in a total volume of 20.00 mL (15.00 mL acid + 5.00 mL base), we can find the concentration by dividing the moles of H+ ions by the total volume in liters (0.02 L).

The concentration of H+ ions is 0.0002 moles / 0.02 L = 0.01 M.

Next, we can use the pH formula: pH = -log[H+].

By plugging in the concentration of H+ ions, we get pH = -log(0.01) which results in a pH of approximately 2.30.

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Answer:

Pure

Explanation:

Lotion is pure. Hope this helps!

Answer:

I think pure

hope this helps

have a good day :)

Explanation:

Answer:

24.36 grams.

Explanation:

Ca5(PO4)3(OH) + 9H2O →5Ca(OH)2 + 3H3PO4.

According to the information given, 135.62 g of hydroxyapatite were produced.

Calcium apatite has the chemical formula Ca5(PO4)3(OH), however it is most commonly written Ca10(PO4)6(OH)2 to indicate that the crystal unit cell consists of two entities. Hydroxyapatite, also known as hydroxylapatite (HA), is a naturally occurring mineral form of calcium apatite. The complex apatite group's hydroxyl endmember is called hydroxyapatite. Fluorapatite or chlorapatite can be created by substituting fluoride, chloride, or carbonate for the OH ion. It forms a hexagonal crystal structure when it crystallizes.

Human bone contains up to 50% by volume and 70% by weight of bone mineral, a modified form of hydroxyapatite.

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Answer:

Born Again Raw Feeders

Answer:

  11. 1, 4.5

  12. right; 4.5 > 1

  13. 10, 3

  14. left; 10 > 3

Explanation:

All you're being asked to do is count the squares in the pictures.

11. The number of squares for the left wave from bottom to top is 2, so the amplitude is 1/2 that, 2/2 = 1. For the right wave it is 9 squares from bottom to top, so the amplitude is 9/2 = 4.5.

  left amplitude: 1, right amplitude: 4.5

__

12. The right wave has greater amplitude. Evidence: 4.5 > 1. It also takes up more vertical space in the picture.

__

13. It is difficult to determine the wavelength of the left wave, because two full peaks are not shown. If we try to match corresponding points, they appear to be about 10 squares apart.

The right wave has 2 peaks in 6 squares, so about 3 squares between peaks.

  left: wavelength 10, right: wavelength 3

__

14. The left wave has greater wavelength. Evidence: 10 > 3.

Answer:

11. 1, 4.5

12. right; 4.5 > 1

13. 10, 3

14. left; 10 > 3

Explanation:

Answer:

CH³–C=CH——CH³–CH=CH²

Explanation:

THIS IS PROPYNE TO PROPENE

As a result, when 1.5 moles of H2 and 1.5 moles of Cl2 react, 3 moles of HCl would be created.

2 should be expressed as a co-efficient of the hydrogen atoms present on the reactant side in order to balance the hydrogen atoms. Meaning that both the product and reactant sides now contain two hydrogens is Mg + 2 HCl  MgCl 2 + H 2. As a result, the equation is now balanced.

The reaction's chemical equation is as follows:

H2 + Cl2 → 2HCl

According to the equation, for every 1 mole of H2 that reacts, 1 mole of Cl2 is required, and 2 moles of HCl are produced.

Therefore, for 1.5 moles of H2 and 1.5 moles of Cl2, the limiting reactant would be H2, since it is completely used up in the reaction.

So, 1.5 moles of H2 would produce 2 x 1.5 = 3 moles of HCl.

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d. The polymorphic form of fat crystals is in a glassy state is NOT true.

The statement that the polymorphic form of fat crystals is in a glassy state is not true. Polymorphism refers to the ability of a substance to exist in multiple crystal structures or forms. Lipids, including fats, can exhibit polymorphism, meaning they can crystallize in different arrangements or crystal forms.

When it comes to the texture of foods containing lipids, the polymorphic form of fat crystals does play a significant role. The specific crystal form and arrangement of the lipids can affect the texture of the food, influencing factors such as mouthfeel, creaminess, and stability.

The solid fat content versus temperature profile is an essential factor in determining texture, as stated in option a. The morphology of the crystals formed, as mentioned in option b, also plays a crucial role in texture. Option c is true as well, as foods containing partially crystalline lipids can exhibit a "plastic" texture.

However, option d is not accurate because the polymorphic form of fat crystals can exist in various states, including crystalline and semi-crystalline states, but not in a glassy state. Glassy states are typically associated with amorphous materials rather than crystalline structures.

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Extinct

When all of the members of species die out it is called extinct

To determine a reagent that can oxidize Cr to Cr2 but not Sn to Sn2, we need to consider the reduction potentials (also known as redox potentials) of these elements. The reduction potential indicates the tendency of a species to gain electrons and undergo reduction.

In this case, we want a reagent that has a higher reduction potential than Cr but a lower reduction potential than Sn. By doing so, the reagent will be able to oxidize Cr (acting as an oxidizing agent) but not Sn since Sn's reduction potential is higher than that of the reagent. Based on this criterion, one suitable reagent is acidified potassium dichromate(VI) (K2Cr2O7/H2SO4).

K2Cr2O7/H2SO4 is a commonly used oxidizing agent in various chemical reactions. In an acidic medium, it undergoes reduction and transfers oxygen atoms to the element being oxidized. The relevant reaction for this scenario can be represented as follows:

3Cr + K2Cr2O7 + 8H+ → 4Cr2+ + 2K+ + 7H2O

In this reaction, Cr is oxidized from the +3 oxidation state to the +6 oxidation state, forming Cr2+. However, the acidified potassium dichromate(VI) reagent does not possess sufficient strength to oxidize Sn. The reduction potential of Sn is lower than that of Cr, making it less prone to undergo oxidation by this reagent.

It is worth noting that the selection of appropriate reagents for oxidation or reduction reactions depends on the specific requirements of a reaction. Other reagents with higher reduction potentials than Cr, such as potassium permanganate (KMnO4), could also be considered as alternatives. However, the acidified potassium dichromate(VI) reagent mentioned above is a widely used and effective choice for oxidizing Cr without affecting Sn.

Remember to always consult reliable sources, reference materials, or your teacher to ensure the accuracy and relevance of specific reagents for a given reaction, as the field of chemistry is vast and continually advancing.

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Answer:

684

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 684 g of lead would be required to make 119 grams of water.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

The balanced equation for the given reaction can be written as below

Pb + PbO\(_2\) + 2H\(_2\)SO\(_4\) \(\rightarrow\)2PbSO\(_4\) + 2H\(_2\)O

Mathematically,

The mole ratio between lead and water is 1:2

(119 g H2O) / (18.01532 g H2O/mol) x (1 mol Pb / 2 mol H2O) x (207.21 g Pb/mol) = 684 g Pb

The mass of lead comes out to be  684 g.

Therefore, 684 g of lead would be required to make 119 grams of water.

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Answer:

Since they're easy to separate, covalent compounds have low melting and boiling points. 2) Covalent compounds are soft and squishy (compared to ionic compounds, anyway). The reason for this is similar to the reason that covalent compounds have low melting and boiling points. When you hit an ionic compound with something, it feels very hard

Explanation:

mark brainliest plz

Answer:

True

Explanation:The whole point of and expirement is to test the indepedent variable and the outcom or what your measuring is the dependent

sorry for the tone its late where i live

Answer:

Explanation:

A. Ethanoic acid-acetic acid being weak acid dissocated weekly and turns solution to weakly acidic, ph will be between 4-7,

B. Hydrochloric acid - the solution would be acidic- with lots of H+ ions, Ph will be between 1-4,

C. Sodium chloride - solution prodcued netural Na+ and Cl- hence wont affect ph of solution will be equalt to 7.

D. Sodium hydrogen carbonate-NaHCO3 is weak base and the PH will be above 7,

The balanced chemical equation is as follows:

4KClO₃ ₍s₎ ⇒ 3KClO₄ ₍s₎ + 3KCl

The term balanced chemical equation is defined an equation where the number of atoms of each type in the reaction is the equal on both reactants and product sides.

The chemical equation must be balanced in order to obey the law of conservation of mass. When the number of different atoms of elements in the reactants side equals the number of atoms in the products side, the chemical equation is balanced.

Thus, The balanced chemical equation is as follows:

4KClO₃ ₍s₎ ⇒ 3KClO₄ ₍s₎ + 3KCl

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The hydrolysis of an imine or an enamine can produce the following:

B) Amine

C) Ketone

D) Aldehyde

An imine's or an enamine's hydrolysis is a reversible process. The amine and the carbonyl molecule (aldehyde or ketone) are the end products of the process. Acid or base is used to catalyze the process.

The mechanism of the reaction is as follows:

In organic chemistry, the hydrolysis of an imine or enamine is a typical reaction. It is used to make carbonyl compounds and amines.

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Since the dipole moment of gaseous AgCl is 11.5 D and the ionic character of AgCl is 78.1%, we can assume that the magnitude of the partial charge is 0.781.

Magnitude is a measure of the size, strength, or intensity of something. It can refer to physical objects, such as earthquakes, or abstract concepts, such as numbers or emotions. In physical sciences, magnitude is typically used to measure an object's size, intensity, or speed. In mathematics, magnitude is often used to indicate the size of a number, usually expressed as the absolute value. Magnitude is also used to describe the size of an emotion or feeling, such as happiness or sadness.

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Answer:

D. 1,950 g

Explanation:

I completed the test and it is the correct answer!

The mass of one mole of gallium iodide GaI₃ is 449.7 g/mol. Hence, the mass of 4.32 moles of GaI₃ is 1950 g.

Gallium iodide is a covalent compound formed by the electron sharing between Ga and three iodine atoms. Ga has three valence electrons and each is shared with three iodine and each iodine in turn shares 3 electrons to Ga.

Atomic mass of Ga = 69 g/mol

Atomic mass of I = 126.9 g/mol

mass of 3 iodine atoms  = 3 ×  126.9 = 380.7 g

Molar mass of GaI₃ = 380.7 + 69 = 449.7 g.

Molar mass of a compound is the mass of one mole of the compound. Hence, one mole of the compound is 449.7 g. Mass of 4.32 moles is :

4.32 × 449.7 ≅1950 g.

Therefore, the mass of 4.32 moles of  GaI₃ is approximately 1950 g.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 5 mL

density = 1.5 g/mL

We have

mass = 1.5 × 5

We have the final answer as

Hope this helps you

Answer:

1.Set your equations Raquel to each other

2.given

3.subtract 7x from both sides

4. Add 12 to both sides

5.divide both sides by four and you get negative 5

Explanation:

Answer:

B. Sodium

Explanation:

The composition of sea water, smoke, and soft drinks are not consistent, and you can separate the parts that make up each. Sodium has a definite and consistent composition, so it is a pure substance.