Which of these changes is an example of a chemical change?

A.) evaporation of water from a pan.
B.) water droplets forming outside a glass on a hot day.
C.) cooking an egg.
D.) dry ice turning into a gas. ​

Succinic acid occurs in fungi and lichens. Its empirical formula is C2H3O2 and molar mass is 118.1 g/mol. Its molecular formula is C4H6O4/ (CH2)2(CO2H)2.

Succinic acid is a dicarboxylic acid with the chemical formula as (CH2)2(CO2H)2. Succinic acid is naturally occurring four-carbon dicarboxylic acid with the molecular formula of C4H6O4 which is produced by liquefied petroleum gas.

The benefit of using succinic acid over traditional salicylic acid or benzoyl peroxide is that succinic acid is found to be gentle and non-drying, making it a good option for sensitive / irritated skin. Succinic acid helps to control and balance excess sebum production to reduce shine and excess oil which is great for those with oily / acne-prone skin.

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In the Dieckmann reaction, the diester undergoes a cyclization reaction to form a beta-keto ester. Two beta-keto esters are formed, one from the carboxyl group at the end of the chain, and one from the carboxyl group at the middle of the chain.

Cyclization is started by the production of a putative cation, typically from a sp3-hybridized carbon, either by electrophilic addition to a double bond or by ionization.

The most frequent cyclization processes take place when an electrophile and a nucleophile interact. Consequently, the following are the most common reaction types: the nucleophilic change in a carbon atom that is saturated. addition by nucleophiles to an unsaturated carbon. Atomic addition-removal nucleophilic.

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Explanation:

Density=Mass/Volume

Mass=500gm

Volume=225ml

Density of juice=500/225=2.22gm/ml (approx)

Ethers are formed via the SN2 method. Since I- is a superior leaving froup than Cl-, the reaction rate will rise when switching from CH3Cl to CH3I. The rate is going to drop. Secondary halides include (CH3)2CHCl.

The broad definition is that the term "rate of a reaction" refers to the pace at which a reaction occurs. For instance, because iron rusts quickly, wood combustion has a rapid response rate.

The following five broad characteristics can have an impact on a reaction's pace. the mixture of the reactants. The rate increases as concentration increases. Temperature, Reactants' current physical state. The existence (and intensity/physical

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Concentration of [tex]\left[\mathrm{Fe}^{3+}\right]$[/tex]at equilibrium is 7.394 M.

Therefore,

Moles of ferric nitrate [tex]$=0.026 \mathrm{~mol}$[/tex]

Concentration of ferric nitrate [tex]=\frac{0.026 \mathrm{~mol}}{2.164 \times 10^{-3} \mathrm{~L}}=12.015 \mathrm{M}$[/tex]

12.015M of ferric nitrate solution will contain: If 1 mole of ferric nitrate yields 1 mole of ferric ions, then

Moles of [tex]$F e(S C N)]^{2+}$[/tex] at equilibrium  = 0.01 mol

Concentration of [tex]$F e(S C N)]^{2+}$[/tex] at equilibrium =

[tex]$[\mathrm{Fe}(S C N)]^{2+}=\frac{0.01 \mathrm{~mol}}{2.164 \times 10^{-3} \mathrm{~L}}=4.621 \mathrm{M}$[/tex]

[tex]$\mathrm{Fe}^{3+}+\mathrm{SCN}^{-} \rightleftharpoons[\mathrm{Fe}(\mathrm{SCN})]^{2+}$[/tex]

Initially

12.015 0

At equilibrium

(12.015 - 4.621 )M 4.621M

Concentration of [tex]$\left[F e^{3+}\right]$[/tex] at equilibrium

= (12.015 - 4.621 )M = 7.394 M

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Electron in biological systems, carrier molecules help temporarily transport the stored energy of electrons and ease the relay of electrons from one carrier molecule to another.

Redox reactions refer to the entire process of moving electrons from one molecule to another. Because one carrier molecule acquires electrons and becomes reduced (red-), earning the name "redox," the other carrier molecule loses electrons and becomes oxidized (-ox). Occasionally, the phrase "oxidation-reduction reaction" is used in its place. When a molecule is oxidized, it either needs electrons or has already given them up. The addition or removal of oxygen (O) or hydrogen (H) is a sign that a molecule has undergone oxidation. Reduced signifies that the molecule has acquired electrons and is prepared to surrender them. An indication is the loss or gain of oxygens (O) or hydrogens (H).Small organic molecules known as electron carriers, also referred to as electron shuttles, are utilized to transport electrons during metabolic reactions. They easily cycle between reduced and oxidized states.

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The complete follows as

What electron carrier is used in the redox reactions in cellular respiration?

The answer is B. It's the only one in which the original mass changes to a different mass.

The radius of atom X is greater than the radius of atom Y, then it is also likely that X has a greater metallic character than Y does option - c is correct answer.

As we move from left to right, the amount of metallic character decreases while the amount of nonmetallic character increases. This is brought on by an increase in the enthalpies of ionisation and electron gain brought on by an increase in the effective nuclear charge.

Because radius decreases over the course of a period, if X has a larger radius than Y, X is on the left side of Y in the periodic table.

The assertion A is untrue because electron affinities increase from left to right.

Statement B is false because the effective nuclear charge increases from left to right.

The statement C is true because the metallic character gets thinner from left to right.

D is untrue because ionization energy increases from left to right.

Since X is more metallic than Y, the assertion E is untrue.

The correct response is therefore statement C.

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Avogadro's principle, which applies the standard of the number of atoms in a mole of gas, enhances this formula. (P1*V1)/T1 = (P2*V2)/T2

PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in Kelvin, is the equation for the ideal gas law.

calculating for V

PV = nRT

V = (nRT)/P

Needed to divide both sides by P in order to transfer V from the left to the right side of the equation:

PV = nRT

nRT/P = PV/V

This is the right equation: P = (nRT)/P.

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Answer:A mole is a way of counting things, in the case of chemistry those things are molecules.

But the number of things is a chemical reaction are not necessarily preserved: some reactions create more molecules (electrolysis of water (H2O), for example, starts with two molecules of water but delivers one molecule of oxygen gas (O2) and two molecules of hydrogen gas (H2)).

So moles are not conserved if the structure of the molecules changes because of the reaction. The point of writing equations is to match conservation of matter (atoms don't disappear) to the structures of the molecules involved in the reaction. Sometimes reactions just rearrange the atoms and give the same number of moles of product, sometimes they create more molecules, and sometimes they create fewer molecules.

In an ideal gas, there is a neat relationship between the number of moles and the volume or pressure (at constant pressure the volume is proportional to the number of moles of gas; at constant volume, the pressure is proportional to the number of moles of gas). So your question asks you to compare the number of moles resulting from the reaction to the number going into the reaction. since they are the same, the pressure won't change.

Explanation:   I know it's a lot to read I'm sorry but I want you to get an A on it so there you go. Hope this helps

The heat that is produced when sodium and chlorine ions establish an ionic bond is known as the heat of formation.

Ionic bonding, a sort of chemical bonding that involves the electrostatic attraction between two atoms or ions with sharply differing charges, is the main interaction that takes place in ionic compounds.

The electrical attraction between two ions with opposing charges in a chemical molecule creates an ionic bond, also known as an electrovalent bond.

One atom's valence (outermost) electrons are permanently transferred to another atom to create this type of bond. Ionic bonds, which occur when two negatively charged ions join forces with positively charged ones, are formed when one atom transfers electrons to the other. Ionic bonds can be seen in the chemical compound sodium chloride.

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The equation for the reaction associated with the kb2 of carbonate, co32– is:
CO32– + H2O ⇌ HCO3– + OH–

A chemical reaction is a process that involves the reorganization of the molecules or ions of one or more substances to form different substances. Chemical reactions can involve the breaking down of substances into smaller molecules or ions, the joining of molecules and ions to form new substances, or the exchange of atoms between molecules. Examples of chemical reactions include combustion, rusting, photosynthesis, and fermentation.

This reaction is a double-displacement reaction, in which the cations and anions of the two reactants switch places. The carbonate ion (CO32–) reacts with water to form the bicarbonate ion (HCO3–) and the hydroxide ion (OH–).

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Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, 148.5J is the amount of heat that was  required to heat the water.

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances. Internal energy is the sum of all kinds of energy that the particles of a matter can possess, for example translational energy. Rotational energy.

Mathematically,

Enthalpy=mass of unknown water× specific heat capacity of water× Change in temperature

mass of water= 0.5 kg

specific heat capacity of water=4.184J/Kg°C

Change in temperature=final temperature - initial temperature

=75°C -4°C

= 71°C

enthalpy=?

Substituting all the given values in the above equation, we get

enthalpy= 0.5× 4.184× 71

              =148.5J

Therefore, 148.5J is the amount of heat that was  required to heat the water.

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A. acetid acid is the most soluble in water among the pentanol, butanoic acid, pentanal

Acetic acid is the most water-soluble among the given options. Acetic acid is a carboxylic acid and is highly polar, meaning that it has a high affinity for water. The presence of the carboxyl group (-COOH) gives acetic acid the ability to form hydrogen bonds with water molecules. Pentanol, butanoic acid and pentanal are less polar than acetic acid, they have lower solubility in water. Among them, pentanol has the highest solubility, but still it is less polar than acetic acid, followed by butanoic acid, and pentanal is the least water-soluble among the options.

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A container of hydrogen sulphide gas has a pressure of 35,650Pa. This pressure in torr is 267.4 torr.

Given the  pressure of hydrogen sulfide gas is (P) = 35,650Pa

We know that 1 atm = 101,325 Pa = 760torr

Then let 35,650Pa is equal to y torr.

y x 101,325 = 760 x  35,650

y = 267.4torr

Pressure is defined as the force perpendicular to an object's surface applied per unit area over which that force is dispersed. The force of one newton applied perpendicularly to a surface area of one square metre constitutes the fundamental unit of pressure, the pascal.

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Answer:

gg

Explanation:

your skrewed

The differentiation of cells is responsible for the development of specialized tissue in living organisms.

The process by which dividing cells are able to change their functional or phenotypical type is called cell differentiation. All cells have presumably been derived from the stem cells and have obtained their functions as they mature.

Cellular composition is often described as a hierarchical scheme where the stem cells are at the top of the hierarchy. According to mathematical models of cell differentiation, the proliferation, death, and differentiation of an appropriately distinguished cell population are considered.

For example, the cells that are present in a stem cell population are able to differentiate into multiple types of cells. They are able to maintain their number by self-renewal.

A progenitor cell population is derived from the stem cells and it differentiates into a restricted cell lineage. Here, a mature cell population is derived from the progenitor cells and they perform some functions and then die a natural death.

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Cu(s) + 2 AgNO3(aq) —> Cu(NO3)2(aq) + 2 Ag(s) According to the balanced chemical equation, 7.09 x 10²³g of silver will be produced from combining 100 g of copper with 200 g of silver nitrate.

The balance chemical equation is defined as the total mass of reactant is exactly equal to the total mass of product.

Molar mass of Cu  is 63.57 g/mol.

Mole of Cu in 100 g

= (100 g/63.57 g/mol)

= 1.573 mol

Molar mass of AgNO3 is 169.91 g/mol.

Mole of AgNO3 in 200 g

= (200 g/169.91 g/mol)

= 1.177 mol.

From the balanced, the mole ratio of Cu to AgNO3 is 1:2.

So, for 1.573 mol of Cu, mole of AgNO3 required for reaction

= (2/1) x 1.573

= 3.146 mol.

Therefore, Cu is the excess reactant.

From the balanced equation again, the mole ratio of AgNO3 to Ag is 2:2 or simply 1:1.

Then, for 1.177 mol of AgNO3, mole of Ag produced is (1/1) x 1.177 = 1.177 mol.

By Avogadro’s Number, 1 mole of any substance contains 6.022 x 10²³ atoms.

Hence, for 1.177 mole of Ag, the number of Ag atoms produced

= (1.177 mole x 6.022 x 10²³ atoms/mole)

= 7.09 x 10²³.

Thus, According to the balanced chemical equation, 7.09 x 10²³g of silver will be produced from combining 100 g of copper with 200 g of silver nitrate.

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Answer:

predation

Explanation:

The types of interaction in which one organism will be consumed are predation and competition.

PREDATION: When one animal hunts down another animal for food, it is called predation. The animal that is hunting is called the predator and the one being hunted is called the prey. Certain patterns of predation give us a particular food chain. For example, an insect is eaten by a frog, a frog is eaten by a snake, and a snake is then eaten by a vulture.

COMPETITION: In this type of interaction, a group of animals or individual animals compete for food or other resources. Depending on the resource being competed for, it is of various types.

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1. Percent yield = (Actual yield/Theoretical yield) x 100

Actual yield = 1.50 g Cu

Theoretical yield = (0.5 f Al) x (1 mol Al/27.0 g Al) x (1 mol Cu/1 mol Al) x (63.5 g Cu/1 mol Cu) = 1.35 g Cu

Percent yield = (1.50 g Cu/1.35 g Cu) x 100 = 111.1%

2. Balanced chemical equation: 2 Al + 3 CuCl2 → 2 AlCl3 + 3 Cu

Answer: 2Al + 3CuCl2 → 2AlCl3 + 3Cu, Percent yield is 84.9%

Explanation: Find moles of aluminum using molar mass then x by coefficient ratio of cu/al. Then divide 1.5 by that value and x 100.

the process of creating nitrile from amide. In this reaction, thionyl chloride and amide combine, producing nitrile as well as SO2 and HCl gas. The elimination of byproducts (such as SO2 and HCl) is crucial to the success of this reaction.

the mechanism or technique by which a result is generated or a goal is achieved. machinery or mechanical devices in general. the arrangement or organization of components of a machine, comparable equipment, or something similar. any mechanical device or component: a clock's mechanism

a method or technique that is employed to bring about a certain outcome. NIST SP 800-160v1r1 is one of the sources. the essential procedures entailed in or accountable for an activity,

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Calcium Carbonate (formula weight 100.1) dissolves in 1800 ml at a rate of 0.0095 g, and its ksp is 2.8 x [tex]10^{-9}[/tex]

The equilibrium constant for a saturated solution of an ionic chemical at a certain temperature is known as the solubility product constant (Ksp). We need to know the compound's molar solubility in order to determine the Ksp. From the stated solubility, which is 0.0095 g in 1800 ml, it is possible to determine the molar solubility of caco3. We must convert the solubility of calcium carbonate into moles in order to compute molar solubility. 0.00094 moles are equivalent to 0.0095 g of caco3. We may now use the Ksp equation, which is Ksp = [Ca2+][CO32-]. When we replace Ksp with the molar solubility ofcalcium carbonate, we get 2.8 x  [tex]10^{-9}[/tex]as Ksp = 0.00094 x 0.00094.

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Landslides are an example of erosion and it is denoted as option B.

This is referred to as the geological process in which earthen materials are worn away and transported by natural forces such as wind, water etc.

Landslides on the other hand is also associated with mass wasting and it is referred to as the movement of a mass of rock, debris, or earth down a slope and it is as a result of factors or forces such as water etc which is therefore the reason why erosion was chosen as the most appropriate choice.

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The tautomerization of 3-pentanone gives two possible enols, one of which is shown.  the second enol formed in this reaction is shown in the first image.

Tautomerization is a process in which a molecule can exist in two or more different forms that are constitutional isomers (also called tautomers) of each other. These forms differ by the position of a proton (H+ ion) and have different chemical properties. Tautomerization is a type of isomerization, which is a chemical reaction in which a molecule is converted into one of its isomers.An enol is a type of organic compound that contains a carbon-carbon double bond and a hydroxyl group (-OH) on the same carbon atom, known as the alpha carbon. Enols are structural isomers of the corresponding ketones and aldehydes and can exist in equilibrium with them through the process of tautomerization.

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0.233 liters of  4.25 M sucrose contain 109 g of solute  which is used In biochemistry laboratories, in high speed centrifuges to separate the parts of a biological cell.

Moles of sucorse = [tex]\frac{mass}{molar mass}[/tex]

= [tex]\frac{245}{342.3}[/tex]

= 0.71575 mol

volume of solution = [tex]\frac{moles}{concentration}[/tex]

= [tex]\frac{0.71575}{3.07}[/tex]

= 0.233 L

In chemistry, a mole, usually spelled mol, is a common scientific unit for calculating huge concentrations of minute particles like atoms. The International System of Units uses the mole (symbol: mol) as the unit of material quantity (SI). The amount of substance is a metric for determining how many elementary entities of a specific substance there are in a given object or sample. The mole concept permeates all of chemistry. Understanding the mole is crucial for the study of chemistry because the mole is the subject of the majority of quantitative chemical calculations. an understanding of the mole's relationship to mass and entity count.

A substance's molarity (M) is the volume of solution in which it is present. The moles of a solute are referred to as molarity.

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0.233 liters of 4.25 M sucrose contain 109 g of solute which is calculated in the below.

The number of moles can be calculated by taking the ratio of mass and molar mass.

Moles of sucrose = 109 g /342.3 g/mol

= 0.71575 mol

Molarity of a substance can be expressed as the ratio of its number of moles to the volume of solution in L.

Molarity = number of moles /Volume of solution

4.25 M= 0.71575 moles/ Volume of solution

Volume of solution= 0.233 L

The mole is crucial for the study of chemistry because the mole is the subject of the majority of quantitative chemical calculations. An understanding of the mole's relationship to mass and entity count.

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O The NaCl will fail to dissociate. is NOT true. When solid NaCl is stirred into water, it will dissociate, meaning it will separate into individual sodium and chloride ions, which will make the solution conduct electricity and taste salty.

When a solid ionic compound dissolves, there is a process known as dissociation that separates the ions. The ability to formulate dissociation equations is crucial. Simply reverse the crisscross technique you learnt to use when writing ionic compound chemical formulas.

Dissociation is the process by which chemical molecules (or ionic compounds like salts, or complexes) disintegrate into simpler components like atoms, ions, or radicals. This process is typically reversible, as it is for CO2 and H2O at high temperatures.

Association and recombination are opposed by dissociation. Dissociation, for instance, causes metal pipes used in water treatment to corrode more quickly and cause more pitting in the anode area of concentration cells. In the presence of hydrogen sulfide and water, the dissociation of the hydrogen-sulfide molecule is also necessary for the corrosion of iron.

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The reason the red level immediately went up when the thermometer was placed in the jar of hot water was 3.) molecules of the red liquid gain. Thermal energy from the hot water causes them to expand up the thermometer as they become less dense.

A glass tube filled with mercury that expands or contracts as the temperature changes serves as the medium through which a thermometer measures temperature. The tube and bulb are so small that the mercury can reach the temperature of what they are measuring extremely quickly.

The mercury molecules in the red liquid, which receive thermal energy from the hot water, expand up the thermometer as their density decreases.

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Answer: 4240.08

Explanation: 29 grams of NaOH is equivalent to .725 moles of NaOH since the molar mass of NaOH is 39.997. We do the calculation 29/39.997 to find the number of moles.

The unit M or molarity represents moles per liter. .171 M NaOH means there are .171 moles of NaOH in one liter of the solution. To find the volume needed, we can divided the number of moles we have which is .725 by .171 to find liters. This gives us 4.240 L or 4240.08 ml.

If you are confused by the calculation, you can look at how the units change: M=Mol/L .725 is in moles. We do mol/(mol/L) which is the same as mol*(L/mol) so the mol cancels and we are left with a unit in liters which we can easily convert to milliliters.

Answer:

Hydrogen bonding

Explanation:

Hydrogen bonding is the strongest intermolecular force in water, giving water many of its characteristics and acting to pull water molecules closer to each other.

I hope this helps!