you and a friend are studying for a chemistry exam. what if your friend tells you, "since exothermic processes are favored and the sign of the enthalpy change tells us whether or not a process is endothermic or exothermic, the sign of dhsoln tells us whether or not a solution will form"? how would you explain to your friend that this conclusion is not correct? what part, if any, of what your friend says is correct?

If we consider a structure in which a carbon is bonded to two three carbon chains and a branched alkane then the branched alkane is a 2 carbon chain with a  ethyl on Carbon 1 then the correct name of the structure is 4-(isopropyl)heptane.

The two three carbon chains bonded to the carbon atom will form the parent chain of this structure and this chain will have 7 carbon atoms in it.

Since this chain is that of an alkane and it has no functional group attached so the root name will be heptane.

Now, we have to add a prefix by naming the branched alkyl chain. The branched chain has 3 carbon atoms in it with a methyl group on carbon 1.

So, this name of this group will be propyl.

The position of this propyl group is 4th on the parent chain so the full name of the structure will be 4-(isopropyl)heptane.

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The best reducing agent is Na2S.

A chemical species known as a reducing agent in chemistry "donates" an electron to an electron acceptor. The Earth metals, formic acid, oxalic acid, and sulfite compounds are a few examples of chemicals that are frequently used as reducing agents.

A material that induces oxidation by receiving electrons becomes reduced when it acts as an oxidising agent. A chemical that reduces something by gaining electrons is said to be an oxidising agent. There are examples of how to recognise oxidising and reducing agents.

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The name given to the smallest group of atoms, ions, or molecules that form the building block of a mineral is called unit cell.

What is unit cell?

A unit cell is the smallest part of a crystal lattice that exhibits the three-dimensional structure of the entire crystal. The identical unit cell can be thought of as being duplicated in three dimensions in a crystal.

An atom is what?

Atoms, which are minuscule bits of matter, are what distinguish each chemical element from the others. A negatively charged core nucleus and one or more orbiting electrons make up an atom. There may be the positively charged, somewhat massive protons and neutrons that make up the nucleus.

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The thickness of a sheet of aluminum (al) foil is t = 0.015 mm.

The definition of density is the mass of a material per unit of volume. The Latin letter D may also be used, however the sign is most usually employed to denote density. The mathematical definition of density is mass divided by volume.

row = m/V

where is the density, m is the mass, and V is the volume.

The connection between a substance's mass and the amount of space it occupies is known as its density (volume). The density of a substance is determined by the mass, size, and arrangement of its atoms. Density (D) is defined as the product of a substance's mass and volume.

V = mass/ Density

V = 3.736/2.699

V = 1.3842 cm³

area = 1.00 ft²

as we know,

1ft = (0.305m)²

    = 0.093m²

   = 0.093 * 10⁶ mm²

so, the thickness will be,

t = 1384.2/ 0.093 * 10⁶ mm²

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The energy is released upon emission is E =  1.7 x 10⁵ J/mol.

The formula of energy is

      E = hv

Here,

      v = c / λ

c = speed of light

  = 3 × 10^8

λ = 660 nm

  = 660 × 10^-9

       v = c / λ

          = 3 × 10^8 / 660 × 10^-9

       v = 4.5 × 10^14

Value of h = 6.626 x 10^-34 Js

      E = hv

      E = 6.626 × 10^-34 Js ×  4.5 × 10^14

      E = 2.9 × 10^-19 J/ photon

The amount of energy we receive is one photon's worth. To find the solution to this question, we must thus multiply this result by Avogadro's number.

E = 2.9  x 10 ⁻¹⁹ J/ photon x 6.022 x 10 ²³photon/mol

E =  1.7 x 10⁵ J/mol

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The concentration of making 87.3 ml of salicylic acid solution with 0.45 mg is 3.73x10⁻⁵ M

To solve this problem, the formulas and the procedures that we have to use are:

Where:

Information about the problem:

Converting the volume units from (ml) to (L) we have:

v(solution) = 87.3 mL * (1 L/1000 ml)

v(solution) = 0.0873 L

Converting the mass units from (mg) to (g) we have:

m =  0.45 mg * (1 g/1000 mg)

m = 0.00045 g

Having the MW we calculate the moles of salicylic acid:

n(salicylic acid) = m(salicylic acid) / MW(salicylic acid)

n(salicylic acid) = 0.00045 g / 138.12 g/mol

n(salicylic acid) = 3.258x10⁻⁶ mol

Applying the molarity formula, we get:

M = n(solute)/v(solution) L

M = 3.258x10⁻⁶ mol / 0.0873 L

M = 3.73x10⁻⁵ M

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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She will use 10 L of the 20% solution.

A mixture is a substance made up of two or more dissimilar chemical compounds that are not chemically linked in chemistry. When two or more substances are physically combined, their identities are maintained, and the mixture takes the shape of solutions, suspensions, or colloids.

Let

x = amount of 8% solution

y = amount of 20% solution

The chemist wants to end up with a 12-L mixture, so

x + y = 12

0.8x L of salt is present in an 8% solution, while 0.2y L is present in a 20% solution. When blended, the mixture should have an 18% salt concentration, or 18% of 12 L = 2.16 L of salt, so

0.08x + 0.2y = 2.16

Solve for y :

x = 12 - y

0.08 (12 - y) + 0.2y = 2.16

0.96 - 0.08y + 0.2y = 2.16

0.12y = 1.2

y = 10

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pH of the buffer solution is 1.76.

Chemical dissociation of formic acid in the water:

HCOOH(aq) ⇄ HCOO⁻(aq) + H⁺(aq)

The solution of formic acid and formate ions is a buffer.

[HCOO⁻] = 0.015 M; equilibrium concentration of formate ions

[HCOOH] + [HCOO⁻] = 1.45 M; sum of concentration of formic acid and formate

[HCOOH] = 1.45 M - 0.015 M

[HCOOH] = 1.435 M; equilibrium concentration of formic acid

pKa = -logKa

pKa = -log 1.8×10⁻⁴ M

pKa = 3.74

Henderson–Hasselbalch equation: pH = pKa + log(cs/ck)

pH = 3.74 + log (0.015 M/1.435 M)

pH = 3.74 - 1.98

pH = 1.76

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The pressure of gas will increase by a factor of 4.

When absolute temperature of a gas is increased 4 times while maintaining constant volume, The pressure of the gas is increased by a factor of 4.

This can be explained by Gay-Lussac Law, which states that at any constant volume, the pressure of the gas will be directly proportional to the temperature for a given gas.  
PV=nRT  ,

Gay-Lussac law explains  the relationship between temperature and pressure at constant volume. 

P ∝ T  =>  P1 / T1 = P2 / T2

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The half-life gets longer as the initial concentration increases in zero-order reaction.

The amount of time it takes for the concentration of a given reactant to reach 50% of its initial concentration is known as the half-life of a chemical reaction (i.e. the time taken for the reactant concentration to reach half of its initial value).

For zero order reaction:

The half-life is given as:

[tex]t_{1/2}=\frac{[A]_{0}}{2k}[/tex] where k is the rate constant of the reaction and [tex][A]_{0}[/tex] is the initial concentration.

As we can see that the half-life is directly proportional to the initial concentration. Therefore, when the initial concentration increases the half-life gets longer.

For the first-order reaction,

The half-life is given as:

[tex]t_{1/2}=\frac{\ln 2}{k}=\frac{0.693}{k}[/tex]

A first-order reaction's half-life is independent of the initial concentration.

For a second-order reaction,

The half-life is:

[tex]t_{\frac{1}{2} }=\frac{1}{k[A]_{0}}[/tex]

The initial concentration is inversely proportional to the half-life, so when the initial concentration increases the half-life will get shorter.

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The types of energy are correctly matched below:

Thermal energy: Coal-fire power plant

Electrical energy: power plant

Sound energy: Radio

Chemical/potential energy:Coal

Energy conversion is also known as energy transformation whereby a type of energy changes to another form of energy.

There are various types of energy which includes:

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The sample most likely to be a protein .

Amino acids, which are smaller building blocks of proteins, are linked together in lengthy chains to form proteins. To create a protein, 20 distinct kinds of amino acids can be mixed. Each protein's precise function and distinctive 3-dimensional structure are determined by the order of the amino acids.

Combinations of three DNA building units (nucleotides), which are dictated by the order of genes, are used to code for amino acids.

The main functions of the proteins are determined below:-

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Lipids the compound present in food with formula C₄₄h₈₆O₈NP

The compound with a formula C₄₄H₈₆O₈NP is understood as phosphatidylethanolamine. it's the second most abudant phospholipid in animal and plant lipid, after phosphotidylcholine. It is present in many foods. Also a main lipid component of microbial membranes. it's found in all living cells and compose of 25% of all phospholipids.

What is the role of lipids in food?

They are important in the diet as energy sources and as sources of essential fatty acids and fat-soluble vitamins, which tend to accompany fats. They also contribute satiety, flavor, and palatability to the diet.Dietary lipids are primarily oils (liquid) and fats (solid). Commonly consumed oils are canola, corn, olive, peanut, safflower, soy, and sunflower-seed oil . Foods rich in oils include dressing , olives, avocados, spread , nuts, seeds, and a few fish. Fats are found in animal meat, dairy products, and cocoa butter

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One possible drawback to moist-heat cookery is that color, flavor, vitamins and minerals may leach out and be lost in the liquid.

What is cooking with moist heat?

Liquid or steam is used in moist heat cooking to deliver heat to the food. Poaching, steaming, and braising are three common methods. Each os the moist heat cooking method uses heat in the form of liquid or vapor to slowly cook food and loosen connective tissue.

Numerous nutrients, including vitamins and minerals, are lost when food is cooked using moist heat because these nutrients stay in the liquid that they were originally cooked in. Taste is lost when food is boiled since it also stays in the liquid.

Question:

One possible drawback to moist-heat cookery is that _______ may leach out and be lost in the liquid.

a.color

b.flavor

c.vitamins

d.minerals

e.all the above

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Answer:

2

Explanation:i had this same question

The ph of a 0.10 m monoprotic acid ha is measured to be 3.5. The ka value of this acid is 10^(-6).

What is pH?

The hydrogen ion concentration is measured using the pH scale. The pH values, which range from 0 to 14, are assigned to it. Therefore, we may say that the pH value is a number that represents how acidic or basic a solution is.

A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.

HA⇌H+ + A−

ka= [H +][A −]/[HA]

For weak acids, [H+] = [A-]

[H+] = 10^(-pH)

Thus, Ka = {10^(-3.5)}^2/0.10 = 10^(-6)

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The resultant pressure force acting on a body completely or partially submerged in a liquid is the

When a body is completely or partially submerged in a liquid, the resultant pressure force acting on the body is called the buoyant force.

A fluid's uoyancy, also known as an upthrust, is an upward force that works against the weight of an item that is partially or completely submerged in the fluid. Because of the weight of the fluid on top, pressure in a fluid column rises with depth.

Accordingly, a fluid column's bottom has a higher pressure than its top. Similar to this, when an object is submerged in a liquid, the pressure at the bottom of the object is higher than at the top. The net force on the object is upward due to the pressure difference. According to Archimedes' principle, the force's strength is proportional to the difference in pressure and is equal to the weight of the fluid that would otherwise occupy the space.

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The net ionic equation is: 2H⁺(aq) + S²⁻(aq) → H₂S(g)

A net ionic equation is an ionic equation which does not indicate the ions which remains in the solution as ions at the end of the reaction but only the ions which form the products are shown in  a net ionic equation.

The ions that remain in solution are known as spectator ions.

The ionic equation of the given reaction is given below:

Mn²⁺S²⁻(aq) + 2H⁺SO₄²⁻ (aq) → Mn²⁺SO₄²⁻ (aq) + H₂S(g)

The net ionic equation is: 2H⁺(aq) + S²⁻(aq) → H₂S(g)

In conclusion, a net ionic equation only shows ions that form products.

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Then  there is an increase in Entropy.

A state of disorder, unpredictability, or uncertainty are frequently related with the scientific concept of entropy, which is also a quantifiable physical characteristic. The notion and the phrase are employed in a variety of disciplines, including classical thermodynamics, where they were initially identified, statistical physics, which describes nature at the molecular level, and information theory. It has wide-ranging uses in physics and chemistry, biological systems and how they relate to life, cosmology, economics, sociology, weather science, and information systems, particularly the transfer of information through telecommunication.

The amount of different configurations that the atoms in a system can take depends on its entropy. Entropy can be thought of as a gauge of uncertainty or unpredictability.

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A baseball’s resultant velocity is 17.23 m/s, at 26.02° from the level ground then the  horizontal component of the baseball’s velocity is 15.4835m/s

Velocity means the direction of the movement of the body or the object here given data is velocity =17.23 m/s, at angle= 26.02° and we have to find  horizontal component of the baseball’s velocity=?

So, Horizontal distance can be expressed as x=V × t

Cos26.02°=x/17.23 for vector component, this means that the

17.23cos26.02°= x horizontal component is the hypotenuse length

x=15.4835m/s is the horizontal component of the baseball’s velocity

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Gold is fcc and has a lattice constant of 0.40788 nm . The value for the atomic radius of a gold atom in nanometers is 0.14421 nm. .

A gold atom touches another along the diagonal on each face of the unit cell of a fcc lattice, which has right angles. Typically, the diagonal is shown as extending from the center of one atom to the center of a second atom and to the center of a third atom. As a result, one can construct a right triangle whose hypotenuse is 4r, where r is the radius of a gold atom, and whose legs both have lengths of a = 0.40788 nm. By applying the Pythagorean theorem,

a^2 +  a^2  = ( 4r )^2,

2 a^2 + = (16r^2) ,

and r = (21/2/4)a,

where an is the stated covalent atomic radius of gold and r is 0.14421 nm.

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The energy required to ionize a muonic hydrogen atom compare to that required to ionize a regular hydrogen atom:

Muonic hydrogen is an exotic hydrogen atom, where a muon (instead of an electron) orbits proton. Because muon is 200 times heavier than the electron, the muon's orbit is 200 times closer to the proton in muonic hydrogen than that of the electron in regular hydrogen.

The extremely precise extraction of proton radius obtained by Pohl et al. from measured energy difference between the 2P and 2S states of muonic hydrogen disagrees significantly with that extracted from electronic hydrogen or elastic–proton scattering. This discrepancy is proton radius puzzle.

In muonic hydrogen electron is replaced by muon, μ which is 200 times heavier than electron

ΔE= En - Ei

for hydrogen like atom,

ΔE= 13.6(Z square /n square) - (-13.6Z square/1 square)

For, Z=1 and n=x (for ionization)

I.E.=13.6eV for electron

I.E.∝ mass (as binding energy proportional to mass)

I.E.=13.6eV*200

    =2720eV

    =2.720keV

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Since carbon has four valence electrons, it can create four covalent bonds to reach the entire outer energy level.

The electrons in an atom's outermost shell, or energy level, are called valence electrons. For instance, the valence electrons of oxygen are six, with two in the 2s subshell and four in the 2p subshell.

For neutral atoms, the number of valence electrons is equal to the number of the atom's primary group. The main group number of an element in the periodic table can be found by looking at its column. For instance, the group 4 member carbon contains four valence electrons. Oxygen, a group six member, has six valence electrons.

Chlorine, fluorine, iodine, and astatine are members of the halogen family of elements, which are those containing seven electrons in the valence shell.

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0.19264 × 10^23 molecules of NH4Br are there in 3.166g of NH4Br.

Given

Mass = 3.166g

Molecular mass of NH4Br = 97.94

Moles = Given mass / molar mass

Moles = 3.166 / 97.94

Moles = 0.032

To get number of molecules

Molecules = Moles × 6.02 × 10^23

                = 0.032 × 6.02 × 10^23

Molecules = 0.19264 × 10^23

Depending on the context, the term may or may not include ions that fit this condition. A molecule is a collection of two or more atoms held together by the attractive forces known as chemical bonds.

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Answer:

106.119 calories

Explanation:

Hope this helps! If you need a step-by-step explanation feel free to ask and I'd be happy to give it to you <33

The correct option is cyclohexane.

What is the product of the following reaction? Cyclohexane.

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120 KJ of heat is absorbed in this reaction.

As we know

Where W is the provided mass of carbon, which is 30g, n=W/M

M is the carbon molar mass. 30 / 12 = 2.5 moles at 12g/mol.

As a result, the heat absorbed by 2.5 moles of carbon is equal to 120 kJ, or half the heat absorbed by 5 moles of carbon, or 239.9 kJ.

The heat evolved (either emitted or absorbed) during a process that runs at constant pressure is equivalent to the change in enthalpy. The internal energy (U) and pressure-volume product (PV), are both supplied by the equation:

H=U+PV

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Answer:

Probably the most common use is the first-order decay law, which describes everything from radioactive decay to the metabolism of drugs.

Much of the power of logarithms is their usefulness in solving exponential equations. Some examples of this include sound (decibel measures), earthquakes (Richter scale), the brightness of stars, and chemistry (pH balance, a measure of acidity and alkalinity)

Explanation:

Elution sequence for chemicals, from the fastest to the slowest is hydrocarbons, olefins, ethers, halocarbons, aromatics, ketones, aldehydes, esters, alcohols, amines and acids.

What is Elution sequence ?

No matter how polar the compounds are, the more polar the solvent, the faster the chemicals elute. Therefore, altering the polarity of the solvent will not alter the order in which the compounds elute off a TLC or column. This may seem counterintuitive because a polar solvent would seem to carry polar compounds farther than nonpolar compounds.

Consider that chemicals and solvents will fight for locations on the stationary phase in order to help you visualize this idea. Slow elution will be caused by molecules remaining attached to the stationary phase due to a less polar solvent's poor ability to compete. Molecules and a polar solvent will successfully contend for locations on the stationary phase.

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