A piece of stone which weight 50g was placed in a measuring cylinder containing water, The level of the water rose from 30cm³ to 35cm³.calculate the density.​

The bond between adjacent amino acids is a covalent peptide bond. A protein is made up of a lengthy chain of amino acids that are connected by peptide bonds.

A water molecule is removed during a biological process that links the carboxyl group of one amino acid to the amino .Peptide bonds are the connected that hold the amino acids of a peptide together in a particular order. Two atoms share an electron pair equally in a covalent link. Peptide (amide) and disulfide links between amino acids, as well as C-C, C-O, and C-N bonds within amino acids, are examples of significant covalent bonds.

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Equilibrium concentrations of reactant and products

CH2Cl2=0.043

CH4=0.136

CCl4=0.136

When both the reactants and products are at concentrations that do not change over time, they are said to be in chemical equilibrium. In this state, the forward reaction rate is equal to the reverse reaction rate.

Explanation:

2CH2Cl2(g) =CH4(g) + CCl4(g)

Initial    0.315mol/L       0                   0

Change    -2x              +x                +x

Equib         0.315-2x     x,               x

Kc = [CH4][CCl4] / [CH2C2] (^2)

10.5 = x(^2) / (0.315 - 2x)^2

Work out the quadratic for x

10.5(4x^2 +0.099225 -1.26x) =x^2

3.90476x^2 -1.26x +0.099225=0

solve for x

discard the negative, can't have less than nothing.

x=0.136

0.315-2x   = 0.315-2*0.136=0.043

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The half-life of iodine-123 is 13.3 hours: Option B: 3.13 mg of a 25.0 mg sample will remain after 39.9 hours.

Initial figure at a constant pace K. equivalent to two lawns over the half-life. One of the two over the half-life would be this. 13.3 hours is iodine 123. This would give us.05 hours to the negative one. then take K. T. out. So much homosexual is equivalent to the original dosage, which is 225 mg. Make a note of 25 mg, -15 hours, and 2 -1 39.9 hours. Therefore, using this would require using a lot of 25 3.22 -9.9 2.08 3 22 for more or less two months. A launch at 1.14. is the same as 1.14. You receive 3.13. It would be measured in milligrams. Thus, 3.13 mg would still be in my system after 39.9 hours.

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[tex]H_{b} < H_{c} < H_{a} < H_{d}[/tex]  is the increasing order of acidity in given compound.

where  [tex]H_{b}[/tex] is least acidic and  [tex]H_{d}[/tex] is most acidic

Higher the stabilization of negative charge produced as a result of removal of proton higher the acidity.  [tex]H_{d}[/tex]  is most acidic because after removal of  [tex]H_{d}[/tex] ,negative charge on oxygen is resonance stabilized by (c=o) group .

similarly after   [tex]H_{d}[/tex]  , [tex]H_{a}[/tex]  is most acidic because negative charge on oxygen is stabilized by conjugation with benzene.

After  [tex]H_{a}[/tex]  , [tex]H_{c}[/tex]  is more acidic than [tex]H_{b}[/tex]  because negative charge on oxygen  is more stabilized while negative charge is less stabilized in carbon.

So to decide the order the stabilization of negative charge produced as a result of removal of proton is checked.

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complete question:

rank the labeled protons (ha-hd) in order of increasing acidity, starting with the least acidic for  below figure.

5.76 L of stock solution is needed to prepare 8L of 0.072 M of  0.10M  concentration of Ba (OH)2. This is calculated by the expression of Molarity.

Molarity is a measure of the concentration of a chemical species in particular of a solute in a solution in terms of amount of substance per unit volume of solution. It is also known as the Molar concentration. By using Molarity equation,

   M1 V1 = M2 V2

The volume of a stock solution of Ba(oh)2, with a concentration of 0.10 m, needed to prepare 8.0 l of 0.072 m Ba(oh)2. A stock solution is prepared by weighing out an appropriate portion of a pure solid or by measuring out an appropriate volume of a pure liquid placing it in a suitable flask and diluting to a known volume.

M1 = 0.10M

M2 = 0.072M

v2 = 8L

We can calculate for V1 by putting all these values in the expression of Molarity.

 V1 = M2 V2 / M1

       = 0.072 M * 8L / 0.10 M

      = 5.76 L

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In case of O3 or SO2, the SO2 has a greater dipole moment than O3.

In case of HBr or HCl, the HCl  has a greater dipole moment than HBr.

In contrast to SO2, which has shorter and stronger bonds than SO, O3 has longer and weaker bonds than O2.

Recoupled pair bond dyad in SO2 produces SO double bonds. On the other hand, O3 has a lone pair on the center oxygen atom in addition to a pair of orbiting electrons on the terminal oxygen atoms, which results in a comparatively weak connection.

Both molecules are polar, although SO2 is more polar than O3 (dipole moment 0.53D ) with a dipole moment of 1.62D.

EN values for Br (2.96), Cl (3.16), and H (2.2) . Cl has the greatest electronegativity; the difference in polarity between H and Cl is the largest, 0.96; while in HBr, the difference in EN value is 0.76.

As a result, HCl will have a higher dipole moment than HBr. The increment of dipole moment is directly proportional to the increment of the electronegativity.

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The energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.

The term enthalpy is defined as the sum of the system's internal energy and the product of its pressure and volume.  

Ice warming Cs = 2.09 J/g∙°C

Enthalpy of fusion ∆H = 6.02 kJ/mol

Liquid water warming Cs = 4.18 J/g∙°C

Enthalpy of vaporization ∆H = 40.7 kJ/mol

Steam Warming Cs = 2.01 J/g∙°C

Step 1: Warm ice from −15.0°C to 0°C.

q1 = 470.25 joule

Step 2: Melt ice.

q2 = 5016.66

Step 3: Warm liquid water from 0°C to 45.0°C.

q3 = 2821.5 joule

The total energy is the sum of the energy of each step.

q = q1 + q2 + q3

= 470.25 + 5016.66 + 2821.5

= 8.30kj

Thus, energy is required to take a 15.0-g sample of ice at −15.0 °c to liquid water at 45.0 °c is 8.30kj.

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This amount of solute would be provided by 2.5 grams of a 10.0% solution.

% (w/v) formula:

[tex]% (\frac{w}{v}) = \frac{grams solute}{mL of solution} *100[/tex][tex](\frac{w}{v})[/tex]%[tex]= \frac{grams solute}{mLof solution} *100[/tex]

[tex]10[/tex]% [tex]NACl(\frac{g}{mL})= \frac{grams NaCl}{25mL} *100[/tex]

To calculate the mass in grams of NaCl required to create a 10% (w/v) NaCl solution, divide 10% by 100 and multiply the result by 25.

[tex]0.1*25 = 2.5g[/tex]

Salt, commonly known as sodium chloride (NaCl), is a substance that our body needs in order to absorb and transport nutrients, regulate blood pressure, maintain fluid balance, convey nerve messages, and contract and relax muscles.

Salt, or sodium chloride, accounts for about 75 to 90 percent of the sodium we consume. Our bodies require sodium, an essential mineral found in salt, for processes including blood pressure regulation and nutrition absorption. In addition to using salt to season food, clean household goods, and treat some medical conditions. Greater health issues like high blood pressure, heart disease, and kidney disease can be brought on by consuming too much salt. Your chance of developing those illnesses can be decreased by consuming less salt and consuming more potassium.

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5.87 g of nickel (Ni), is deposited when 0.2 faraday of electrical charge is transmitted through a solution of NiS[tex]O_{4}[/tex].

The balanced Equation of nickel is :

Ni²⁺ + 2e —> Ni

The Molar mass of nickel is 59 g[tex]mol^{-1}[/tex]

The Molar mass of Ni= 1×59=59 g[tex]mol^{-1}[/tex]

Number of faraday =2                                      (∵ Nickel losses 2 electrons )

To Determine the mass of Ni deposited.

2 faraday deposits 59 g[tex]mol^{-1}[/tex] of nickel.

To get 0.2 farad deposits what mass of nickel , we have,

2 farad = 59  g[tex]mol^{-1}[/tex] of nickel

0.2 farad = ?

⇒[tex]\frac{(59 gmol^{-1} )(0.2 )}{2}[/tex]

⇒5.87  g[tex]mol^{-1}[/tex] ≈ 5.9 g [tex]mol^{-1}[/tex]

Electroplating is essentially the hydrolysis-based plating of one metal onto another, either to stop corrosion of the metal or for ornamental purposes. In order to create a slim coherent metal coating on the electrode, the technique reduces dissolved metal cations using an electric current. When anions are electrically oxidized on a solid substrate, such as when silver chloride is formed on silver wire to create silver chloride electrodes, electroplating is frequently used.

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Marissa is investigating a biochemical reaction involving carbon compounds. the reaction requires a specific enzyme. The role of the enzyme in this reaction is to speed up the chemical reaction.

Enzymes are protein molecules. Enzymes lower the activation energy necessary for the reaction to occur. This allows the reaction to happen more quickly than it would without an enzyme present.

Any reaction requires a specific enzyme. That specific enzyme allow the

reaction to speed up, otherwise there is no change in reaction speed.

Enzymes work by decreasing the activation energy required to start biochemical reactions.

So, the enzyme role of enzyme is to speed up the reaction ad decreasing the activation energy of the reaction.

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Considering the definition of complete combustion, the chemical equation for the complete combustion of C₇H₁₆ is:

C₇H₁₆(l) + 11 O₂(g) → 7 CO₂(g) + 8 H₂O(g)

Combustion is a chemical process through which heat is obtained. To achieve this, oxidation reactions are generated that allow the objective to be reached. It is necessary to have several elements:

Complete combustions are those reactions in which the combustible material is completely oxidized (consumed) and other oxygenated compounds are produced, such as carbon dioxide (CO₂) or sulfur dioxide (SO₂), as the case may be, and water (H₂O).

In other words, complete combustion is the result of the complete oxidation of the fuel but not the disappearance of the oxidizer, that is, the oxidation of all the fuel occurs. For this it is necessary that the necessary quantities of oxidizer and dry air intervene. All complete combustion releases, as a product of the reaction, carbon dioxide (CO₂) and water in the vapor state (H₂O).

Considering the definition of complete combustion, you get:

C₇H₁₆(l) + 11 O₂(g) → 7 CO₂(g) + 8 H₂O(g)

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The mass of 560 cm³ (at STP) of an unknown gas is 1.60 g. This gas is sulfur dioxide (64 g/mol)

The STP condition in an ideal gas is the standard state of the gas. The STP state is defined as the state of standard pressure and temperature. The standard pressure at STP is 22400 cm³ for every 1 mol.

→ 560 gases will have 1/22400 x 560 = 0.025 moles.

Mass = 1.60 g

So:

Number of mols = Mass/Molar Mass

Molar mass = Mass/mols

Molar mass = 1.60 g/0.025 mol

Molar mass = 64 g/mol
So, this gas will be sulfur dioxide.

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The inflammatory response starts to work when tissue is harmed. Before using water for cooking or drinking, consumers are advised by radio announcement to boil it.

Pain, swelling, heat, and redness (Latin: rubor, calor, and tumor) are the four primary indicators of inflammation (dolor).

When tissues are harmed, the immune system is activated and the inflammatory response begins. The innate immune system's immune cells, or neutrophils and eosinophils, are drawn to the site of tissue damage or injury via blood arteries and the lymphatic system before macrophages.

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Answer:

True

Explanation:

I took the test

The answer is True.

--In cis-1,2-dimethylcyclohexane, one methyl group is axial and one methyl group is equatorial in both ring flip conformers, so neither conformer is more stable than the other.

What is Isomer?

--In chemistry, isomers are molecules or polyatomic ions with identical molecular formulae – that is, same number of atoms of each element – but distinct arrangements of atoms in space.

--Isomerism is existence or possibility of isomers. Isomers do not necessarily share similar chemical or physical properties

-- Conformational isomerism is a form of stereoisomerism in which the isomers can be interconverted just by rotations about formally single bonds.

Stereochemistry

Stereochemistry is an isomerism formation whereby the molecules have similar formulation of the molecules and bonded atoms sequence,

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The safest and most accurate way to measure the temperature of the saltwater solution in a beaker is to use a thermometer with a protective sheath.

This type of thermometer is designed to protect the user from potential burns or injury and is also more accurate than other thermometers. The sheath should be made of a material that is heat resistant, such as stainless steel.

The thermometer should also be inserted into the solution as far as possible without touching the sides of the beaker. The thermometer should be left in the solution for a few minutes to allow it to reach equilibrium with the temperature of the solution before reading it.

Finally, the thermometer should be wiped off with a clean cloth before taking the reading. This will ensure the accuracy of the reading and reduce the risk of contamination.

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0.3 M is the  molarity of the solution in which the mass of the plant pieces would not change .

The moles of a solute per litres of a solution known as molarity. The molar concentration in a solution is another term for molarity. Molarity (M), which is determined by dividing the solute's mass in moles by the volume of the solution in litres, is the most widely used unit to express solution concentration: litres of solution/moles of solute equals M.

One litre of a solutions with a 1.00 molar concentration (1.00 M) contains 1.00 moles of solute. Molarity is measured in mol/L. The molarity, which is given as moles/liter, is the quantity of moles of solute per litre of the solution. Measures of the concentration of a mixture of chemicals include molarity and molality. The main distinction between the two is based on mass.

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Answer:

The correct answer is (b)

Explanation:

Has a slippery feel.Vinegar is an aqueous solution of acetic acid, and it has a number of properties that make it useful in a variety of applications. Some of these properties include:(a) Dissolves in water to give an aqueous solution of acetic acid (H*): Vinegar is composed of water and acetic acid, and it can be dissolved in water to form an aqueous solution.(c) Turns litmus from blue to red: Litmus is a type of dye that is used as an indicator in chemical reactions. It turns blue in the presence of an alkaline solution and red in the presence of an acidic solution. When vinegar is added to litmus, it will turn the litmus red, indicating that it is an acidic solution.(d) Reacts with zinc to give hydrogen gas: When vinegar is mixed with zinc, it can produce hydrogen gas. This reaction is an example of a redox reaction, in which the vinegar is reduced (gains electrons) and the zinc is oxidized (loses electrons).However, vinegar does not have a slippery feel, so (b) Has a slippery feel is not a property of vinegar.

False. It is more crucial to arrange the components of a scientific process in a manner that is understandable to you than it is to list them in sequentially when modeling it.

The engineers can now do their tasks continuously instead of sequentially as they did in the past. pertaining to or founded on a procedure for testing a statistics hypothesis that requires looking at a series of samples before deciding whether to approve or reject the theory or to keep sampling from each one. sequentially.

Sequential tasks involve steps in a together that and follow a sequential order or sequence. Writing a message, creating a recognisable image, and piecing together a puzzle are a few examples of these activities.

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Given that kb for ch3ch2nh2 is 6.3 × [tex]10^{-4}[/tex] at 25 °c, 1.58 x [tex]10^{-11}[/tex]  is the value of ka for ch3ch2nh3 at 25 °c.  

We can use the water auto-ionization constant,

which is written as Kw = Ka* Kb,

where Kw = 1.0 x[tex]10^{-14}[/tex] and ka and kb are the acid and base constants, respectively.

Another thing to keep in mind is that CH3CH2NH3+ and CH3CH2NH2 are an acid/conjugate base pair, so the above equation can be used.

Given the value for Kb, we must substitute it in and solve for Ka.

Ka = Kw/Kb  

= 1.0 x [tex]10^{-14}[/tex] /6.3 x[tex]10^{-4}[/tex]

= 1.58 x[tex]10^{-11}[/tex]

Thus ,the value of ka for ch3ch2nh3 at 25 °c is  1.58 x[tex]10^{-11}[/tex]

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(a) 57.9 mol moles of carbon dioxide are produced when 19.3 mol of propane gas is burned in excess oxygen.

The combustion reaction can be defined as the complete oxidation of any hydrocarbon; such reactions typically produce just carbon dioxide and water as byproducts.

The following is a representation of the propane combustion reaction, given the specified conditions:

    C₃H₈ + 5O₂  →   3CO₂ + 4H₂O

19.3 mol of propane is available for combustion.

Three moles of CO₂ were produced for every 1 mole of propane that was burned.

19.3 moles of propane will result in

    3 × 19.3 = 57.9 mol

Thus, burning 19.3 moles of propane gas in extra oxygen produces 57.9 moles of CO₂.

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All other options given apply to exothermic reaction.

Since it is an endothermic reaction, More bond energy is absorbed on the reactants side than is released on the products side.

A chemical reaction is the process of chemical transformation of one group of chemicals into another group.

Classical chemical reactions involve changes that affect only the position of electrons in forming and breaking chemical bonds between atoms, with no changes in the nucleus (no changes in the elements present) and many If , it can be described by a chemical equation. Nuclear chemistry is a subfield of chemistry that deals with chemical reactions of unstable radioactive elements in which both electronic and nuclear changes can occur.

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I used the simulation to model the changes by adjusting the Temperature slider at the bottom. As I increased the temperature, the equilibrium shifted towards the products side.

The temperature is a measure of how hot or cold something is. It is measured using a thermometer and can be expressed in Celsius, Fahrenheit, or Kelvin. Temperature can be affected by many factors, including air pressure, humidity, wind, and the time of day.

I also observed the pie graph to see how the system changed. As the temperature increased, the number of molecules for both nitrogen and hydrogen decreased, while the number of molecules for ammonia increased. I also used the pause button on the simulation to observe the number of particles at any point of time. This allowed me to see how the reaction was progressing and how the equilibrium shifted as the temperature increased.

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Answer:

Wegener's theory was primarily rejected since he offered no explanation for how the continents might move.

Explanation:

The theory also went against many ideas widely accepted in the community.

Atoms with a strong attraction for electrons they share with another atom exhibit a strong covalent bond. This is true.

In a covalent bond, atoms share electrons in order to achieve a stable, lower-energy configuration. The strength of the covalent bond depends on the electronegativity of the atoms involved and the distance between them. Atoms with high electronegativities, such as oxygen and fluorine, tend to have a strong attraction for the electrons they share with another atom, resulting in a strong covalent bond.

In general, covalent bonds are relatively strong compared to other types of chemical bonds, such as ionic bonds or hydrogen bonds. They are also generally more directional, meaning that they are more directional and tend to be more directional in nature, which gives rise to the formation of specific geometries in molecules.

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Atoms with a strong attraction for electrons they share with another atom exhibit a strong covalent bond. This is true.

In a covalent bond, atoms share electrons in order to achieve a stable, lower-energy configuration. The strength of the covalent bond depends on the electronegativity of the atoms involved and the distance between them. Atoms with high electronegativities, such as oxygen and fluorine, tend to have a strong attraction for the electrons they share with another atom, resulting in a strong covalent bond.

In general, covalent bonds are relatively strong compared to other types of chemical bonds, such as ionic bonds or hydrogen bonds. They are also generally more directional, meaning that they are more directional and tend to be more directional in nature, which gives rise to the formation of specific geometries in molecules.

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Answer:

1:1

Explanation:

In industrial, sodium hydroxide is a well-liked strong base. In order to make sodium salts and detergents, regulate pH levels, and synthesise organic compounds, sodium hydroxide is employed.

Since aqueous solutions are more convenient and affordable to handle, they are typically handled in bulk. When it is preferable to make a mixture more alkaline or to neutralise acids, sodium hydroxide is frequently utilised. For instance, sodium hydroxide is a drilling mud additive that is used in the petroleum sector to raise the viscosity and alkalinity of bentonite mud systems as well as to neutralize any acid gases that may be discovered in the geological formation as drilling advances. Salt also has a use.

M1V1 = M2V2

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Answer: 24.41 The molar heat of combustion of gaseous cyclopro- pane is -2089 kJ/mol; that for gaseous cyclopentane is -3317 kJ/mol. Calculate the heat of combustion per CH2 group in the two cases, and account for the difference.

Explanation:

The pressure in the plastic bag is equal to the initial pressure of the gas in the aerosol can, which is 5.20 atm.

Aerosol is a type of suspension of fine particles or liquid droplets in air or another gas. Aerosols are typically created when a material is dispensed from a pressurized container and dispersed in the form of a spray, mist, foam, or foam. Examples of aerosols include dust, smoke, smog, fog, and spray paint. Aerosols can also be generated naturally, such as the spraying of saltwater droplets from the ocean’s surface. Aerosols are important for many scientific and industrial applications, such as in medicine, agriculture, and manufacturing. They are also essential in the production of consumer products such as cosmetics, paints, and cleaners. Aerosols also play a key role in the global climate system, as they affect the amount of sunlight that reaches the Earth’s surface and the formation of clouds. Aerosols are also used in research and environmental monitoring, as they can provide information about air quality and climate change.

This is because, as the gas is sprayed out of the can into the plastic bag, it expands and its pressure decreases. However, the pressure of the gas in the plastic bag will stay the same as the pressure of the gas in the aerosol can, so long as the temperature of the gas stays constant. This is because, according to the ideal gas law, the pressure of a gas is directly proportional to its temperature. Therefore, the pressure of the gas in the plastic bag will be 5.20 atm.

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Answer: The atomic mass of an element is not a whole number because it is based on the abundance of each isotope for that element.

Explanation: The atomic mass of an element is not a whole number because it is based on the abundance of each isotope for that element. The atomic mass of an element is a weighted average of the atomic masses of all of its naturally occurring isotopes, taking into account the relative abundance of each isotope. For example, if an element has two isotopes, one with an atomic mass of 10 and the other with an atomic mass of 12, and the isotope with an atomic mass of 12 is more abundant, the atomic mass of the element will be closer to 12 than to 10. This means that the atomic mass of an element is usually not a whole number because it is an average of several different atomic masses.

Answer:

a) Ca+ H2O = Ca(OH)2 + H2