a student needs to prepare a 1h nmr sample for an organic compound soluble in chloroform (chcl3) . the student cannot use chcl3 as the solvent for the sample, but rather uses deuterated chloroform (cdcl3) because:

Neon is stable noble gas having the atomic number 10 and there are 8 valence electron in the outermost shell.

Neon is a noble gas having the valence electron 8.  Valence electrons are the total number of electrons present in the outermost shell of an atom. The valence electron for neutral atom is always definite. Neon has eight valence electrons, a full octet that makes neon quite stable Noble gas. This can be confirmed via it's electronic configuration by looking at the highest energy level. The electronic configuration of Neon is, 1s2 2s2 2p6 or [He] 2s2 2p6. Here, the 2s orbital holds two valence electrons while the 2p orbital holds the other six valence electrons. so there are 8 valence electrons that is a full octet. This follow the octet rule.

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The vapour pressure of water is 17.438 mm Hg.

The molar masses of glucose is 180 g/mol and water is18 g/mol.

Number of moles of glucose = 25/180

=0.139

Number of moles of H2O = 450/ 18

=25

Mole fraction of glucose = 0.139/ 0.139+25

= 0.0055

Lowering vapour pressure is directly proportional to the mole fraction

P 0−P/ P 0 = X

17.535−P/ 17.535 = 0.0055

P = 17.438

Hence, the vapour pressure of a solution is 17.438 mm Hg.

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The [tex]CCl_{2}O[/tex] Lewis structure has a trigonal planner form with a 120-degree angle(Shown in the picture).

Two bonding and three nonbonding lone pairs of electrons are present on the central carbon atom of the Lewis structure [tex]CCl_{2}O[/tex]. The three sets of electron pairs are organized in a trigonal planar arrangement. The Lewis structure  [tex]CCl_{2}O[/tex] has a triangular shape.

The [tex]CCl_{2}O[/tex] Lewis structure has a 120-degree bond angle. The configuration is [tex]AX_{2}[/tex]. There are two bonding pairs and one lone pair on the central atom. The electron pairs in this region remain in a plane. Therefore, in the Lewis structure [tex]CCl_{2}O[/tex], the molecular shape is trigonal.

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IR Spectroscopy measures the vibrations of atoms, and based on this it is realizable to determine the functional groups.

CO, absorb in the IR spectrum. More compound molecules have many bonds, and their fluctuation spectra are correspondingly more composite, i.e. big molecules have many peaks in their IR spectra., stronger bonds and light atoms will vibrate at a high extended frequency

Nature rules that only bonds that carry dipoles can absorb infrared light. C-C bonds are normally nonpolar and usually do not show up as summit in the IR spectrum.

So we can conclude that The chart above shows a spectrum in transmission mode.

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The steps of enzyme action in correct order are (A) (iv)--> (ii)--> (iii)-->(i) , So correct answer is option(A) .

The correct order of enzyme ( i.e biological Catalyst) action on catalyst reaction is the following:

(iv)The part of the enzyme where the substrate molecules attach is known as the active site. Once attached, it forms an enzyme-substrate complex.

iii) The induced fit model stated that when the substrate comes into contact with the active site, the active site modulates according to the shape of the substrate to form an enzyme-substrate complex.

ii) The active site of the enzyme is in close proximity to the substrate and disrupts the chemical bonds of the substrate.

i) The enzyme releases the reaction products and the enzyme can freely bind to another substrate.

So the correct answer is option A.

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Complete question:

Are the steps of enzyme action in correct order and choose the right option.

(i) Enzyme releases products of reaction and the enzyme is free to bind to another substrate.

(ii) Active site of enzyme is in close proximity of substrate and breaks the chemical bonds of substrate.

(iii) Binding of substrate induces enzyme to alter its shape fitting more tightly around substrate.

(iv) Substrate binds to active site of enzyme fitting into active site.

A) (iv), (ii),(iii),(i)

B) (iii),(ii),(i),(iv)

C) (i),(ii),(iii),(iv)

Answer:

The pattern that can be seen from the table is that the energy for decomposition reactions increases as the elements become more complex. For example, the reaction energy for the deterioration of water (2H₂O) is +498 kJ/mol, whereas the reaction energy for the decomposition of sulfur dioxide (SO₂) is +550 kJ/mol. The highest reaction energy is observed in the deterioration of hydrogen iodide (2HI) with a reaction energy of +769 kJ/mol.

Explanation:

The given compound is a carboxylic acid with a hydroxyl group. The IUPAC name of the following compound is 2-hydroxyhexanoic acid.

IUPAC states certain rules to to name the organic compounds. Firstly the name of the compound is based on the number of carbon atoms in  the longest chain.

The carbon atoms with the functional groups attached are numbered in such a way that, they have the small numberings. The functions groups are named with their suffix or prefix.

The given compound is a carboxylic acid with the group COOH. The long chain contains 6 carbons and a hydroxyl group is there in the second carbon. Hence, its name is 2-hydroxy hexanoic acid.

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The hybridization of carbons C-1, C-2, C-3, C-4, and C-5 is sp³, sp², sp³, sp³, and sp² hybridized repecitively in the figure attached below.

In chemistry, orbital hybridization can be described as the concept of mixing atomic orbitals to generate new hybrid orbitals suitable for the pairing of electrons to form chemical bonds.

For example, in a carbon atom that forms four single bonds the valence-shells here orbital combines with 3 valence-shell p-orbitals to form 4 equivalent sp³ mixtures in a tetrahedral arrangement around the carbon to bond to four different atoms.

The carbon sp² hybridizes when one π (pi) bond is required for the double bond between the carbons and 3 σ bonds are formed per carbon atom. The chemical bonding in compounds with triple bonds is sp hybridization.

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Answer:  

the equipment needed to determine the density of a liquid sample is HYDROMETER or AEROMETER .

Explanation:

HYDROMETER is a device which measures the specific gravity( relative density) of a liquid sample. it does not give us direct density .

it is the ratio of the density of liquid to the density of water .

a hydrometer is made up of glass. also,it consists a cylindrical stem and bulb which is weighed with mercury(Hg) or lead(Pb) shot so that it can float .

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Answer:

To determine the density of a liquid sample, you would need a hydrometer.

Explanation:

A hydrometer is an instrument used to measure the density or specific gravity of a liquid.

It works by using the principle of buoyancy, where an object will be buoyed up, or pushed to the surface, by a force that is equal to the weight of the fluid displaced by the object.

The hydrometer has a weighted bulb at one end and a graduated stem. The weighted bulb is placed in the sample liquid and the stem is read to determine the density of the sample.

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Answer:

0.005 moles of sulfuric acid are in the solution

Explanation:

The m in 6.0 m refers to the molality of the solution, which is a measure of the amount of solute (in moles) dissolved in a given amount of solvent (in kilograms).

The concentration of a 6.0 m solution can also be expressed as 6 moles of solute per kilogram of solvent (6 mol/kg).The molality of a solution is important to consider when determining the concentration of a solution because it takes into account the mass of the solvent and the amount of solute dissolved.

For example, a 6.0 m solution would have a higher concentration than a 3.0 m solution, even though they both contain the same amount of solute. This is because the 6.0 m solution has twice as much solute dissolved in the same amount of solvent.

In addition to giving the concentration of a solution, the molality can also be used to calculate the freezing point depression, boiling point elevation, and osmotic pressure of a solution. Knowing the molality of a solution can therefore be very useful in many different applications.

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Many Europeans were afraid of the tomato in the late 1700s. The fruit was given the moniker "poison apple" because it was believed that aristocracy consumed them and became ill and died, but the truth was that wealthy Europeans used pewter plates, which contained a lot of lead.

What is Poisonous food?

People can become unwell from something they ate or drank and contract food poisoning, one type of foodborne illness. The germs or other toxic components in the meal or drinks are the causes.

Vomiting, diarrhoea, and upset stomach are common signs of food poisoning. Typically, after ingesting the dish, symptoms appear hours or even days later. Most people only suffer minor illnesses, which heal on their own.

Food poisoning can occasionally result in serious sickness or consequences.

All foodborne infections are generally referred to as "food poisoning." To be more particular, a healthcare professional might use the following terms:

All infections caused by tainted food or drink are referred to as "foodborne illnesses."

Toxin-related disease is referred to as "food poisoning" in this context. One sort of foodborne illness is food poisoning.

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An organic compound's skeletal formula, also known as its line-angle formula or shorthand formula, is a type of molecular structural formula that serves as a shorthand representation of a molecule's bonding and some details of its molecular geometry.

A skeletal formula depicts a molecule's skeletal structure or skeleton, which is made up of the skeletal atoms that make up the molecule. It's drawn in two dimensions, like on a piece of paper. It uses the most common conventions in organic chemistry to represent carbon and hydrogen atoms.

The succession of atoms that are joined together to form an organic compound's fundamental structure is known as its skeletal structure. Chains, branches, and rings of bound atoms can make up the skeleton. Non-carbon and non-hydrogen skeletal atoms are known as heteroatoms.

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Aqueous potassium phosphate reacts with aqueous nickel(ii) bromide to produce solid nickel(ii) phosphate and aqueous potassium bromide. the correct option is a) true

The chemical reaction is given as follows :

K₃PO₄(aq)  +   NiBr₂(aq)   ----->   Ni(PO₄)₂(s)   +  KBr(aq)

the reaction is not balance to balance the chemical equation number of atoms in the product side is equals to the reactant side. so, multiply 2 in K₃PO₄ , 3 in NiBr₂ and 6 in KBr, we get :

2K₃PO₄(aq)  +   3NiBr₂(aq)   ----->   Ni(PO₄)₂(s)   +  6KBr(aq)

potassium      nickel bromide       nickel             potassium bromide

phosphate                                   phosphate

Now the above reaction is balanced. potassium phosphate reacts with  nickel(ii) bromide to produce nickel(ii) phosphate and potassium bromide.

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For for than 30 years, lead has not been allowed in pewter. Tennessee Pewter is fully lead-free and suitable for use with food.

Lead-free and safe to use, modern pewter is a good choice. 95% tin, plus copper and antimony, are the main ingredients. "The items are guaranteed to be lead-free and quite safe to be used for all types of food and drink," one producer claimed.

Due to health concerns raised by the Lead content, pewters are no longer used in objects (such as cups, plates, or jewelry) that will come into touch with people's bodies.

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The freezing point of a solution of 60 g of glucose dissolved in 80 g of water is −7.74 oC.

The number of moles of glucose =Mass of glucose / Molecular weight of glucose

​=  60 g /180 g/mol

= 0.333 mol

The molality of glucose solution =

Number of moles of glucose / Mass of solvent (in kg)

= 0.333 mol/ ( 80 g/ 1 kg/ 1000g)

= 4.163 mol/kg

The depression in the freezing point of glucose solution :

ΔTf=K fm

=1.86K kg /mol×4.163 mol/kg

=7.74 K

The freezing point of pure water is 0 o C

The freezing point of glucose solution

= 0−7.74

= −7.74 oC

Therefore, the freezing point of a solution of 60 g of glucose dissolved in 80 g of water is −7.74 oC.

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Taffi frequently finds herself being cast by her teachers and fellow students in stereotyped and constrained roles, albeit ones that on the surface appear to be favourable. She is a victim of benevolent sexism.

Sexism is bias or discrimination against someone based on their gender or sex. Although it can effect anybody, sexism particularly harms women and young girls. The idea that one sex or gender is inherently superior to another has been connected to stereotypes and gender roles.

Aspects of benevolent sexism include the value placed on gender-stereotypically feminine traits in women (such as nurturing) and the conviction that traditional gender roles are required for cohesion. Paternalism, or the idea that men should protect women, is another example of benevolent sexism.

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The given question is incomplete. The complete question is:

Taffi is majoring in chemical engineering. She is treated differently because of stereotyped behavior and restrictiveness in her role as a student in this major, often in a way that seems superficially beneficial. What is Taffi experiencing?

A. stereotype threat

B. benevolent sexism

C. racism

D. hostile sexism

Taffi constantly observes that her instructors and classmates cast her in stereotypical and limited roles, despite the fact that these roles initially seem to be positive. She is a target of benevolent sexism.

Bias or discrimination against someone because of their gender or sex is known as sexism. Although it affects everyone, sexism has a negative impact on women and young girls in particular. Stereotypes and gender roles have been linked to the notion that one sex or gender is intrinsically superior to another.

The value placed on gender-stereotypically feminine attributes in women (such nurturing) and the idea that traditional gender roles are necessary for cohesion are examples of benign sexism. Another is paternalism, which is the notion that men should defend women.

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The given question is incomplete. The complete question is:

Taffi is majoring in chemical engineering. She is treated differently because of stereotyped behavior and restrictiveness in her role as a student in this major, often in a way that seems superficially beneficial. What is Taffi experiencing?

A. stereotype threat

B. benevolent sexism

C. racism

D. hostile sexism

A chemical formula is a phrase that lists the constituent parts of a compound together with their relative proportions.

A written chemical formula is a straightforward illustration of an actual, three-dimensional molecule. The precise atoms that make up a material are described in its chemical formula. The empirical formula, the molecular formula, and the structural formula are the three fundamental types of chemical formulas.

Empirical, molecular, and structural chemical formulas are the three basic categories. In contrast to molecular formulas, which display the number of each type of atom in a molecule, structural formulas display the simplest whole-number ratio of atoms in a compound.

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True statement about steel shot versus lead shot is Steel shot is more unstable in flight than lead shot. Hence, option D is correct.

Lead is more dense than steel. The steel pellets weigh one-third less than lead pellets of the same size.

Hence, we can conclude that steel shot is more unstable in flight than lead shot.

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Chemical Properties of Known Compounds Indicate your observations in the reaction matrix.

We can see that a qualitative analysis of the compound shows that it has a lilac flame colour. The lilac flame colour corresponds to the potassium ion (K^+). Chemical Properties of Unknown Compounds Indicate your observations in the reaction matrix .

The test of addition of HNO3(aq) and AgNO3(aq) to a solution is a test for halogens. If the result is a green precipitate, then the ion present is the iodide ion (I^-). The compound must be KI.

Therefore, Chemical Properties of Known Compounds Indicate your observations in the reaction matrix.

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If all the oxygen atoms in the human body were oxygen-18, the human would lose 4.7kg. (Option C)

According to research, our bodies use more calories at rest in low oxygen conditions than in environments with normal oxygen levels. This is probably because the nervous system is activated. Researchers have also discovered that, maybe as a result of elevated levels of the hormone leptin, appetite declines with exposure to decreasing oxygen levels.

Hemoglobin-bound oxygen transport is the main mode of oxygen delivery in blood. The maximum amount of oxygen atoms that a gram of hemoglobin can bind is 1.34 ml. The concentration of hemoglobin (in g/dL blood) multiplied by 1.34 mL O2 / g Hb is used to determine the blood's ability to carry oxygen.

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There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore,  the bond can be represented as M·×X.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The metal belonging to group 1 will have 1 electron in the outermost shell which can be represented as M·

Halogens have also 1 electron in its outermost shell which can be represented as X×

When these combine to form bond then the bond can be represented as M·×X.

Therefore,  the bond can be represented as M·×X.

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All solutions have the same freezing point, which is 0°C.

Solution is a term used to describe the answer or resolution to a problem, challenge, or inquiry of some kind. It is an act or means of solving a problem or reconciling differences. A solution may also involve setting a goal or plan of action to reach the desired outcome. Solutions are often creative and require collaboration from multiple individuals or groups.

This is because the freezing point of a solution can be affected by the presence of dissolved substances, but all of the solutions listed contain the same type of dissolved substances (each contains one mole of a single substance), so they will all have the same freezing point.

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A. Carbohydrates - energy storage

B. Lipids - structural support

C. Proteins - transport molecules

D. Nucleic acids - genetic information

No, not all pewter contains lead. Lead-free pewter is available and is made with a combination of tin, antimony, and copper.

What is Pewter?

Pewter is an alloy made primarily of tin, with small amounts of copper, antimony, and sometimes bismuth. It is a malleable metal with a silvery-grey color, and is commonly used to make decorative items and functional items such as plates, teapots, and figurines.

Lead-free pewter is a type of alloy metal made up of tin, antimony, and copper. This type of pewter does not contain any lead, making it a safe and non-toxic alternative to traditional pewter. Lead-free pewter is often used in the production of jewelry, ornaments, kitchenware, and even tableware. It is valued for its malleability, resistance to corrosion, and durability. Lead-free pewter is also more cost-effective than traditional pewter and is ideal for creating intricate designs and details.

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An organic substance consisting of C, H, and O is not soluble in water. This macromolecule is most probably: lipid.

Lipids are non-polar organic compounds that are insoluble in polar solvents, such as water. They have oily, fatty, and waxy consistency. Lipids are typically made of:

Lipids typically have the following characteristics:

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Because it is a stronger basic than hydroxide ion, it cannot persist in aqueous solution. Examples include ortho-diethynylbenzene dianion (C 6 H 4 (C 2) 2) and sodium hydride (NaH). A neutral base and neutral acid join together to form a bond and share an electron pair.

The three definitions of "base" used in chemistry are Arrhenius base, Bronsted base, and Lewis base. The fact that bases react with acids is acknowledged by all base definitions. Chemistry's definition of an Arrhenius base is a chemical that breaks down into hydroxide ions (OH-) in an aqueous solution. Qualities of a base. The ions in an aqueous base solution split apart to conduct electricity. Its pH level is higher than 7. As they interact with acids, salts are created.

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Cadmium. With the exception of potassium, harmful metal contaminants include chromium, lead, and mercury.

Individual metals and metal compounds that are toxic to humans' health, called "heavy metals," include both single metals and metal compounds. This page discusses certain poisonous semi-metallic elements, such as selenium and arsenic. Many of these metals are essential to life in extremely tiny quantities. But when consumed in greater quantities, they became poisonous. They might accumulate in biological systems and pose a serious risk to one's health. Technical and governmental information regarding hazardous metals can be found on this website as a starting point. As harmful metal contaminants, arsenic and beryllium are also present. An abundant yet uncommon element called cadmium is naturally present in the environment.

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The following data from an experiment to ascertain the effect of water temperature on the amount of sugar that dissolves in a beaker of water were present, and the following components were to be identified:

The experiment is divided into three main sections:

So, the correct answer is -

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Complete question:

A student conducted an investigation to determine the effect of water temperature on the amount of sugar that dissolves in a beaker of water. Identify components for trial 1 of this investigation.