which of the following is true of a thermochemical equation? it includes only the change in enthalpy value. it includes the unbalanced chemical reaction and the change in enthalpy value. it includes the balanced chemical reaction and the change in enthalpy value. it includes only the balanced chemical reaction.

Answer:

Liquids

Liquids have the following characteristics: No definite shape (takes the shape of its container). Has definite volume.

Answer:

it is 56 approximately

Explanation:

the law is mass/molar mass = no. of moles

you have one mole of iron and the molar mass is 56 approximately

then the equation is

mass/56= 1

then this will be 56 grams

Answer:

peralkaline trachyte.

Explanation:

The Breadknife was part of a large shield volcano, that first erupted about 17 million years ago and stopped about 13 million years ago. It is composed of peralkaline trachyte.

The part of the enzyme molecule into which the substrate fits is called the active site. The active site is a specific region on the surface of an enzyme to which the substrate binds and chemically reacts.

The substrate is a molecule that fits perfectly into the active site of an enzyme, and the chemical reaction can only occur in the presence of the appropriate enzyme and substrate. The substrate is the molecule that binds to the active site on an enzyme to catalyze a chemical reaction. The active site is the specific area on the surface of the enzyme to which the substrate binds to form an enzyme-substrate complex. The enzyme's active site and the substrate's chemical structure must be complementary for the enzyme to catalyze the reaction effectively.

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(i) The equation for the dissociation of AgCl(x) in water is AgCl(s) ⇌ Ag⁺(aq) + Cl⁻(aq)

(ii) The solubility, in mol L⁻¹, of AgCl(x) in water at 10°C is 6.2 × 10⁻⁶ M.

(iii) The value of the solubility-product constant, K N, for AgCl (s) at 10°C is 3.8 × 10⁻¹¹.

The expression for the solubility of a sparingly soluble salt in water is Ksp = [salt] * [water], where Ksp is the solubility product constant, [salt] is the molar solubility of the salt, and [water] is the molar concentration of the water.

Ksp = [Ag⁺][Cl⁻]

At equilibrium, the solubility of AgCl is s mol/L. Thus, [Ag⁺] = s, [Cl⁻] = s, and Ksp = s². At 10 °C, the solubility of AgCl is 8.9 × 10⁻⁵ g in 100 mL of water. This can be converted to mol/L:

8.9 × 10⁻⁵ g AgCl / 143.32 g/mol AgCl = 6.2 × 10⁻⁷ mol AgCl

100 mL = 0.1 L

Thus, the solubility of AgCl is 6.2 × 10⁻⁶ M.

The solubility product constant can be calculated as:

Ksp = s² = (6.2 × 10⁻⁶)² = 3.8 × 10⁻¹¹

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We can begin by completing the appropriate algebraic operations to isolate x on one side of the equation before trying to identify it.

20 = 80(.5)^8.32/x

Put 80 on both sides:

20/80 = (.5)^8.32/x

Make the left side simpler:

1/4 = (.5)^8.32/x

Take both sides' reciprocal:

4 = x/(.5)^8.32

Make the right side simpler:

4 = x/0.0027067

Divide the two sides by 0.0027067:

x = 0.0027067 * 4

x = 0.0108268

Hence, x is almost equal to 0.0108268.

Your response is in scientific notation since 5.94 is at least 1 but less than 10. (3.4 10 3) + (5.6 10 4) = 5.94 10 4 is the solution.

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Answer:

Now we can say the silver, gold and platinum do not react with oxygen because these three compounds are least reactive and present in downwards in the reactivity series.

Explanation:

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We see that the RMSD is much smaller than the bond length. This is expected, as the nuclei of the atoms in a molecule oscillate around their equilibrium positions with small amplitudes, even at room temperature.

The root-mean-square displacement (RMSD) of the nuclei in a molecule is given by the following formula:

RMSD = √(3RT/2k)

where R is the gas constant, T is the temperature in Kelvin, and k is the force constant of the bond in N/m.

The force constant of the bond in C₁₂O₁₆ can be calculated using the equilibrium bond length (r_e) and the reduced mass (mu) of the molecule:

k = mu x (2pi x c)² / (r_e)²

where c is the speed of light.

The reduced mass (mu) of C₁₂O₁₆ is:

mu = m_C x m_O / (m_C + m_O)

where m_C and m_O are the masses of carbon and oxygen, respectively. From the periodic table, we have:

m_C = 12.01 g/mol

m_O = 16.00 g/mol

Therefore:

mu = 12.01 g/mol x 16.00 g/mol / (12.01 g/mol + 16.00 g/mol) = 6.646 g/mol

The force constant of the bond can be calculated using the equation:

k = mu x (2pi x c)² / (r_e)²

where c is the speed of light:

c = 2.998 x 10⁸ m/s

Substituting the values, we get:

k = 6.646 g/mol x (2pi x 2.998 x 10⁸ m/s)² / (112.832 pm)²

k = 1.939 x 10³ N/m

Assuming the temperature is room temperature (298 K), the RMSD of the nuclei is:

RMSD = √(3RT/2k) = √(3 x 8.314 J/mol K x 298 K / (2 x 1.939 x 10³ N/m))

RMSD = 6.02 x 10⁻¹² m

Comparing the RMSD with the equilibrium bond length

(112.832 pm = 1.12832 x 10⁻¹⁰ m), we see that the RMSD is much smaller than the bond length. This is expected, as the nuclei of the atoms in a molecule oscillate around their equilibrium positions with small amplitudes, even at room temperature.

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The density of the gas is 0.00015875 g/mL.

To determine the density of the gas, we need to divide its mass by its volume. The volume of the room can be calculated by multiplying its length, width, and height: 2.00 m x 2.00 m x 5.00 m = 20.00 m³

Therefore, the density of the gas is:

Density = mass / volume

Density = 3175 g / 20.00 m³

Density = 158.75 g/m³

We can convert this to g/mL by recognizing that 1 mL is equivalent to 1 cm³. We can convert cubic meters to cubic centimeters by multiplying by 1,000,000. Thus, the volume of the room is 20,000,000 mL.

Therefore, the density of the gas in g/mL is:

Density = mass / volume

Density = 3175 g / 20,000,000 mL

Density = 0.00015875 g/mL

So, the gas has a density of 0.00015875 g/mL.

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The compound that will undergo a faster hydrolysis reaction by the SN1 mechanism is [tex]CH_{3} CH_{2}CH_{2}Cl[/tex] (option B).

SN1 is a kind of nucleophilic substitution reaction that is unimolecular, which means that the reaction's rate is only dependent on the concentration of a single molecule, the reactant. A unimolecular reaction is one in which the rate-determining step is the dissociation of a single molecule. SN1 reactions are unimolecular in nature and proceed in two steps. In the first step, the substrate undergoes heterolysis to form a carbocation and a halide ion. In the second step, the carbocation is attacked by a nucleophile, which can be either neutral or negatively charged.

SN1 mechanism reactions occur when a polar protic solvent is used, which means that the solvent must be able to stabilize the carbocation intermediate that is formed during the reaction. This is the case when the solvent is water, which is polar protic. In comparison to  [tex]CH_{3} CH_{2}CH_{2}Cl[/tex],  [tex]CH_{2}Cl[/tex] will undergo a faster hydrolysis reaction by SN1 mechanism.

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The compound's empirical formula is CH₃, which stands for one carbon atom and three hydrogen atoms.

A compound is a material that is created chemically by combining two or more separate elements in a specific order. Chemical bonds, which may be ionic or covalent in nature, are what hold the constituent parts of a compound together. Many chemical processes, such as synthesis (combining of elements), decomposition (dissolving a compound into its component elements), and exchange, can result in the formation of compounds (replacement of one element in a compound by another).

Assuming that there are 4 carbon atoms and 12 hydrogen atoms, we can calculate the carbon to hydrogen ratio as follows:

By dividing both sides by 4, the ratio of carbon atoms to hydrogen atoms, which is 4:12, can be reduced to 1:3.

This indicates that the chemical has three hydrogen atoms for every one carbon atom.

As a result, the compound's empirical formula is CH₃, which stands for one carbon atom and three hydrogen atoms.

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A potion that can cause boils if brewed incorrectly is an alchemical brew known as a Philter of boils

When brewed incorrectly, this potion causes painful boils to appear on the skin of the drinker. Properly brewed, this philter can be used to treat skin ailments such as eczema, psoriasis, and acne. However, the incorrect brewing of this potion can cause serious harm, resulting in painful and inflamed boils. To ensure the correct brewing of a philter of boils, it is important to follow the recipe closely, using only fresh ingredients. Careful measurements must also be taken, as incorrect amounts of certain ingredients can also cause boils. Finally, the philter must be stirred and boiled for a set amount of time. Any mistakes during this process can result in the creation of a hazardous potion.

In conclusion, a philter of boils is an alchemical potion that can cause painful boils if not brewed correctly. To ensure that the potion is brewed correctly, the recipe must be followed closely, and all measurements and times must be strictly adhered to.

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Each amino acid differs from others in the chemical structure of the R group. So the correct answer is option A.

Amino acids are molecules that are used as the building blocks of proteins. Each amino acid has an amine group (NH₂) and a carboxyl group (COOH) connected to a central carbon atom, as well as a specific side chain, known as the R group, which differentiates one amino acid from another. Therefore, an amino acid differs from others in the chemical structure of the R group. Twenty various amino acids are used to make proteins, all of which have slightly different chemical and physical characteristics, there are polar, nonpolar, and charged amino acids.

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a. The hydrolysis of taxiphyllin in bamboo shoots liberates toxic cyanide (-CN) and a sugar molecule. The arrow-pushing mechanism for this reaction can be represented as follows:

-Taxiphyllin + H₂O → HCN + Sugar

First, water (H₂O) acts as a nucleophile and attacks the glycosidic bond of taxiphyllin, which leads to the formation of an intermediate complex with a hydroxyl group (-OH) attached to the anomeric carbon. Then, the intermediate complex undergoes intramolecular rearrangement to form an oxocarbenium ion. Finally, a proton transfer occurs between the oxocarbenium ion and the water molecule to produce HCN and a sugar molecule.

b. The driving force for the hydrolysis of taxiphyllin is the stability of the products compared to the reactants. Taxiphyllin is a cyanogenic glycoside that is relatively stable under normal conditions. However, in the presence of water, the glycosidic bond in taxiphyllin undergoes hydrolysis to form HCN and a sugar molecule. The release of HCN is energetically favorable because HCN is a more stable molecule than taxiphyllin. The hydrolysis reaction also releases energy, which further drives the reaction forward. Additionally, the toxicity of HCN makes it a potent poison, which can cause respiratory failure and death at high enough concentrations. Therefore, the driving force for the hydrolysis of taxiphyllin is the formation of more stable and toxic products compared to the reactants.

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Answer:

It poses a negative effect on aquatic life

Explanation:

That is it can lead to a shift in species composition to fast growing algae species in water and a shift from long macro algae to more nuisance species

Option C. thermal energy. The portion of the total internal energy of a system that is proportional to its absolute temperature is called thermal energy.

It is a form of internal energy that arises due to the motion of particles within a system, and it increases with increasing temperature. Thermal energy is directly proportional to the absolute temperature of a system, which is measured in kelvin (K). This relationship is described by the equation Q = mcΔT, where Q is the amount of heat added, m is the mass of the system, c is the specific heat capacity, and ΔT is the change in temperature. Therefore, thermal energy is an important concept in thermodynamics and plays a crucial role in many physical processes.

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The correct option is: 2 - It lowers the energy barrier needed for reactants to achieve the transition state or lowers the energy of activation of a reaction.

An enzyme works to catalyze a reaction by lowering the energy barrier needed for reactants to achieve the transition state, or lowering the activation energy of a reaction.Enzymes are specific to particular chemical reactions, meaning that they can only catalyze certain reactions.

The enzyme catalyze a reaction in this way-

An enzyme is a type of protein that works as a biological catalyst to speed up chemical reactions in the body. It works by lowering the activation energy needed for reactants to achieve the transition state, which increases the likelihood of a reaction happening. This allows reactions to occur faster and more efficiently than they would otherwise.

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The temperature of water vapour rises as a result of the water molecules' increased kinetic energy, which makes them travel more quickly and collide more frequently, raising the temperature.

When the heat is raised (as occurs when water boils, for example), the hydrogen bonds between the water molecules completely disintegrate, allowing the water molecules to escape as gas into the air.

Moreover, as gas molecules exit the liquid, the liquid loses thermal energy. As a result, the liquid's temperature doesn't change when it boils. For instance, water will continue to boil at 100°C (at a pressure of 1 atm or 101.3 kPa).

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3.16 µg of Polonium 210 is needed as LD50 for the victim.

The Lethal dose 50 (LD50) of Polonium is 0.045 micrograms (µg) per kilogram (kg) of body weight. The average weight of an adult is 70 kg.

LD50 dose of Polonium = 0.045 µg/kg × 70 kg = 3.15 µg

Assuming the Polonium isotope has a purity of 100%, the atomic mass of Polonium (Po) 210 is 210,

the molar mass of Polonium is:

Molar mass (Po) = 210 g/mol

Moles of Polonium = LD50 dose / molar mass = 3.15 × 10-6 g / 210 g/mol = 1.5 × 10-8 mol

The mass of Polonium needed to deliver an LD50 dose to the victim is:

Mass of Polonium = Moles × Molar mass = 1.51 × 10-8 mol × 210 g/mol = 3.16 × 10-6 g = 3.16 µg

Therefore, 3.16 µg of Polonium is needed to deliver an LD50 dose to the victim.

Note: The mass is given in micrograms, not milligrams or grams. Therefore, the answer should also be in micrograms.

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Among the given reactions of alkenes, the reaction of addition of HBr (treatment with HBr) to an alkene is stereo-specific.

What is stereo-specific?

Stereo-specificity is a chemical concept that describes a reaction's capability to differentiate between stereo-isomers. A stereo-specific reaction is one in which only one stereo-isomer is generated from a given stereo-isomeric reactant. The stereo-chemistry of the reactant, the product, or both is generally associated with stereo-specificity. Stereo-specific reactions are also referred to as stereo-selective reactions.

When an alkene reacts with HBr in the presence of a peroxide initiator, the hydrogen (H) and the bromine (Br) atoms add to the carbon atoms of the double bond in a syn addition. This means that the hydrogen and the bromine atoms are added to the same side of the double bond, resulting in the formation of a single product with a specific stereo-chemistry.

Therefore, the reaction of addition of HBr to an alkene is stereo-specific, because the stereo-chemistry of the product is determined by the syn addition of the hydrogen and the bromine atoms to the double bond. The other reactions listed are not stereo-specific.

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The large peak at the very beginning of the GC spectrum during the analysis of the product from dehydrobromination of 2-bromobutane is likely due to the presence of the solvent used for the extraction of the product.

During the extraction process, it is common to use a polar solvent, such as diethyl ether or ethyl acetate, which can dissolve the desired compound (in this case, an alkene) and separate it from the byproducts and impurities.

However, some of the polar solvent used in the extraction process may carry over to the GC column and be detected as a large peak at the beginning of the GC spectrum. This peak is often referred to as the solvent peak and can interfere with the analysis of the desired compound, making it difficult to accurately determine its concentration.

To minimize the impact of the solvent peak on the analysis, it is important to use a solvent that is significantly more soluble in one phase than the other. This is achieved by choosing solvents that have significantly different polarities or by using solvents that are more basic than the desired compound. The difference in solubility between the two phases allows for effective separation and minimizes the carry-over of the solvent into the GC column, reducing the interference of the solvent peak in the analysis of the desired compound.

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The molecular weight of benzyl-triphenylphosphonium chloride is 388.87.

Benzyltriphenylphosphonium chloride (BTPPCl) is a quaternary ammonium salt that has three phenyl groups and one benzyl group attached to a central phosphorus atom.

Quaternary ammonium salts are organic compounds that have a central nitrogen atom that is bonded to four organic groups. They are commonly known as quats, and they are widely used as disinfectants, surfactants, and catalysts in the pharmaceutical, cosmetic, and food industries.

Benzyl is an organic compound that contains a phenyl group (C6H5) that is attached to a methyl group (CH2). It is commonly used as a solvent and as a starting material for the synthesis of other organic compounds

Phosphonium is an ion with a central phosphorus atom that is bonded to four organic groups. It is the phosphorus analog of ammonium (NH4+). Phosphonium salts are usually obtained by the reaction of phosphines with alkyl or aryl halides. They are used as precursors for the synthesis of organophosphorus compounds, such as phosphine ligands, catalysts, and reagents.

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The reaction that does not occur in a beaker is;

- CH4(g) + 2O2(g) → CO2(g) + 2H2O(ℓ) + 213 kcal

In a beaker, it is unlikely that all of these conditions will be met for a combustion reaction to occur. For example, there may not be enough fuel present in the beaker to sustain a combustion reaction, or there may not be enough oxygen to support the reaction.

Additionally, an ignition source such as a spark or flame is usually necessary to initiate the reaction, which is unlikely to be present in a beaker.

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The correct option is 2:all enzymes are catalysts, but not all catalysts are enzymes and 4:enzymes tend to be organic, whereas nonenzymatic catalysts tend to be inorganic compounds.

Option 2 is correct because

The two types of catalysts available are enzymes and non-enzymes.

Enzymes are biological catalysts that speed up the rate of a chemical and are a particular type of catalyst that aids in the conversion of a substrate to a product. Catalysts that are not enzymes are Non-enzymatic catalysts  Chemical compounds like transition metals, enzymes, and biological complexes can all act as non-enzymatic catalysts. They aid in the creation of the transition state, which speeds up the chemical reaction. Non-enzymatic catalysts may alter the reaction's free energy or change the reaction's pathway to enhance the rate of the reaction

Option 4is correct because

Enzymes are biological molecules made up of carbon, hydrogen, and nitrogen atoms, among other things. As a result, they are classified as organic molecules. Inorganic molecules like metal ions and acids are commonly used as non-enzymatic catalysts.

Hence options 2 and 4 are correct.

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The noble gas whose name comes from the Greek for the strange is called xenon.

The Xenon comes from the Greek word that is Xenos, which means that the strange or the unusual. The another reason is that the Xenon belongs to noble gas group, the elements of which it do not react with the anything to form the compounds.

This unique property of the Xenon makes it the peculiar and this is the reason is why it will behaves in the different manner. Therefore, this is the reason that is why it is known as the stranger gas. The symbol of the xenon gas is Xe.

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The most electronegative element on the periodic table is Fluorine, with a value of 3.98.

Electronegativity refers to an atom's tendency to attract a shared pair of electrons. It is determined by measuring the atomic structure of an element, which is influenced by its position on the periodic table. Electronegativity is a measure of an atom's capacity to draw electrons toward itself in a covalent bond.

An element is a substance that is composed of atoms with the same atomic number. It is a chemical compound that cannot be broken down into simpler substances by chemical means. The periodic table has 118 identified elements, each of which has a unique set of atomic numbers and chemical characteristics.

Therefore the most electronegative element of periodic table is Fluorine, represented by F.

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Answer:

Br2 + H2S => 2HBr + S

Explanation:

Br2 + H2S => 2HBr + S

Br = 2

H = 2

S = 1