2) A 45. 7 g sample of glass was brought to thermal equilibrium with boiling water and then


transferred to 250. 0 g of water that was at 22. 5 °C. This combination reached thermal


equilibrium at 24. 2 °C. What is the specific heat capacity of glass?

The presence of a 1-mol% impurity with a higher heat of combustion in the mixture would affect the determined heat of formation of the particular compound.

The heat of combustion is a measure of the energy released when a substance undergoes complete combustion. The heat of formation, on the other hand, is the energy change accompanying the formation of one mole of a compound from its constituent elements in their standard states.

When the impurity with a higher heat of combustion is present in the mixture, it would contribute more to the overall heat released during combustion compared to the compound being studied. As a result, the measured heat of combustion of the mixture would be higher than if the impurity was not present.

Since the measured heat of combustion is a mole-fraction-weighted average of the components, the higher heat of combustion of the impurity would have a greater influence on the overall value.

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In many cases, the Coase theorem does not work well because c. transaction costs are too high. The Coase theorem suggests that in the absence of transaction costs, parties can negotiate and reach an efficient outcome regardless of the initial allocation of property rights.

However, in reality, transaction costs such as bargaining costs, information costs, and enforcement costs can significantly hinder the ability of parties to negotiate and reach mutually beneficial agreements.

When transaction costs are high, it becomes difficult for parties to gather and exchange information, engage in effective negotiations, and enforce agreements. These costs can include the time and resources required for communication, legal representation, monitoring, and enforcement. High transaction costs can discourage parties from engaging in negotiations or make it economically infeasible to reach an efficient outcome.

Therefore, despite the theoretical possibility of the Coase theorem, transaction costs often present practical barriers to efficient bargaining and prevent the theorem from working effectively in real-world situations.

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There are 38.92 grams of H3PO4 in 265 mL of a 1.50 M solution of H3PO4.

To solve this problem, we need to use the formula:

\(molarity = moles of solute / liters of solution\)

We can rearrange the formula to solve for moles of solute:

moles of solute = molarity x liters of solution

We are given the following information:

molarity = 1.50 M

liters of solution = 0.265 L (converted from 265 mL)

We can now calculate moles of H3PO4:

moles of H3PO4 = 1.50 M x 0.265 L = 0.3975 moles

Finally, we can convert moles to grams using the molar mass of H3PO4:

1 mole H3PO4 = 98 g H3PO4

0.3975 moles H3PO4 x 98 g H3PO4/mol = 38.92 g H3PO4

Therefore, there are 38.92 grams of H3PO4 in 265 mL of a 1.50 M solution of H3PO4.

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Answer:

Diamonds have a broader potential window of 3 to 5 volts.

Explanation:

The minimum voltage required for electrolysis is called potential window. Electrodes such as titanium electrodes and those made of noble metals have a potential window of about 2 volts. Diamond has a potential window of 3 to 5 volts that makes it preferentially start a redox reaction of a substance that is difficult to electrolyze. This facilitates electrolysis of substance that were difficult to decompose in normal electrochemical systems.

The leftovers of \(C_2H_2\) will be 6 moles while the leftover of \(O_2\) will be zero.

In the originally balanced equation of the reaction, 2 moles of \(C_2H_2\) and 5 moles of \(O_2\) react completely to produce 4 moles of \(CO_2\) and 2 moles of \(H_2O\). This equation is balanced with no reactant left.

Now, 8 moles of \(C_2H_2\) were made to react with 5 moles of \(O_2\) in the second reaction. The mole ratio of the two reactants for complete reactions is 2:5. Thus, \(C_2H_2\) has been supplied in excess.

Since only 5 moles of \(O_2\) is available, only 2 moles of \(C_2H_2\) will be consumed. Thus, 6 moles of \(C_2H_2\) will be left while the oxygen will be completely consumed. That is, the amount of \(O_2\) left would be zero.

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Answer:

Avogadro's number, 6.022×1023 6.022 × 10 23 , gives us the amount of substances or particles contained in one mole. For example, there are 6.022×1023 6.022 × 10 23 atoms in one mole of Ba, the symbol for the element barium.

To find the number of atoms in 274.66 g of barium, you need to know the atomic weight of barium and convert the weight to moles. The atomic weight of barium is 137.327 g/mol. Using the formula:

mol = weight/atomic weight

we find that 274.66 g of barium is equivalent to 2.00 mol of barium. Since there are Avogadro's number of atoms per mole, the number of atoms of barium in 274.66 g is equal to 2.00 mol * 6.022 x 10^23 atoms/mol = 1.20 x 10^24 atoms.

The chemist has 642.4 millimoles of barium acetate in the solution.

To calculate the millimoles of barium acetate (Ba(C₂H₃O₂)₂) in the solution, we can use the formula:

moles = molarity × volume (in liters)

First, let's convert the volume from milliliters (mL) to liters (L):

440.0 mL ÷ 1000 = 0.440 L

Now we can substitute the given values into the formula:

moles = 1.46 M × 0.440 L

moles = 0.6424 mol (rounded to 4 decimal places)

To convert the moles to millimoles, we multiply by 1000:

millimoles = 0.6424 mol × 1000

millimoles = 642.4 mmol (rounded to 3 significant digits)

Therefore, the chemist has 642.4 millimoles of barium acetate in the solution.

It's important to note that the molarity (M) represents the number of moles of solute per liter of solution. By multiplying the molarity by the volume in liters, we can find the number of moles of solute. To convert moles to millimoles, we multiply by 1000. The result represents the millimoles of barium acetate present in the given volume of solution.

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It is likely that the creature won't be adversely impacted if a genetic error occurs in a mystery creature's genetic coding but does not modify the amino acid that is generated.

A divergence or mistake from the anticipated or desired result is referred to as an error. Various circumstances, such as those involving technology, science, and human behaviour, can give rise to it. Data loss, system breakdowns, or security breaches can happen from faults in computing that are brought on by bugs, glitches, or defective hardware. Erroneous measurements or insufficient controls are just two examples of faults that can occur in scientific research and produce unreliable or inaccurate results. Errors in human behaviour can result from misunderstandings, poor communication, or errors in judgement and have detrimental effects. In many professions, it is crucial to recognise errors and take steps to prevent them because doing so can boost safety, improve outcomes, and advance research.

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The correct answer for this question is "A new system of units will have to be formulated."

When the mass (kg), force (N), and length (m) are the base units, it forms the SI system.

Therefore, the SI system is not appropriate in this scenario since it has meter, kilogram, and second as its base units. The only option remaining is to form a new system of units that would support these base units in order to resolve the problem.The Metric system is a popular system that is used all around the world. It is quite simple and has three main base units which include mass (gram), length (meter), and time (second). However, it is not acceptable for the aforementioned scenario. Instead, a new system of units will have to be formulated that would support the base units of mass, force, and length.

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The substance combined with germanium that will cause the germanium to emit free electrons is the aluminum. Correct answer: letter D.

Adding aluminum to germanium will cause the germanium to emit free electrons. This is because aluminum has one more electron in its outermost shell than germanium does. When the two atoms are combined, the extra electron from the aluminum will fill the outermost shell of the germanium atom, and the germanium atom will then become unstable and emit an electron.

Aluminum and germanium are elements of the periodic table. Some similarities between the two are:

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They cannot be divided and still keep the properties of the element; option D.

The elephant have the greatest mass; option A

Atoms are the smallest particle of an element that can take part in a chemical reaction.

Atoms of the same element have the same atomic number or the same number of protons.

Atoms of elements cannot be divided and still keep the properties of the element.

The atoms of calcium, gold, argon, iodine will have the following features in common: they cannot be divided and still keep the properties of the element; option D.

Mass of a substance is the amount of matter present in that substance.

The elephant will have the greatest mass of the other animals.

In conclusion, atoms are the smallest particle of a substance that can take part in a reaction.

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The compound that has ionic bonds is KBr (potassium bromide). Therefore the correct option is Option E.

Ionic bonds develop when two atoms with significantly differing electronegativities create a bond in which one atom (the metal) contributes electrons to the other atom (the non-metal). Potassium (K) is a metal in KBr, while bromine (Br) is a nonmetal. The electronegativity of K is low, whereas that of Br is high. When K and Br bond, K contributes its valence electron to Br, resulting in an ionic bond.

The other chemicals listed, on the other hand, have covalent bonding. When atoms with similar electronegativities share electrons in order to produce a more stable electron configuration, covalent bonds occur.

a. H2O has covalent bonds;

b. O2 contains covalent bonds; and

c. Ne is a noble gas that does not create bonds.

d. CO contains covalent bonds.

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Tertiary type of alcohol results when a grignard reagent reacts with a ketone.

Option C is correct.

An organomagnesium compound known as a Grignard reagent has the chemical formula "R-Mg-X," where R denotes an alkyl or aryl group and X denotes a halogen. They are typically made by reacting magnesium with an aryl or alkyl halide.

A halogen compound's number of halogen atoms can be determined using Grignard reagents. Grignard degradation is utilized in numerous cross-coupling reactions and the chemical analysis of specific triacylglycerols for the formation of numerous carbon-carbon and carbon-heteroatom bonds.

Incomplete question:

what type of alcohol results when a grignard reagent reacts with a ketone (followed by h2o)?

A. primary

B.  secondary

C. tertiary

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Answer:

.2 M

Explanation:

grams/molar mass=ans./volume(L)=molarity

5.6/56=ans./.500=.2 M

- Hope that helps! Please let me know if you need further explanation.

Answer:

Cells can only be formed by division of pre-existing cells. [Students should be aware that the 64 codons in the genetic code have the same meanings in nearly all organisms, but that there are some minor variations that are likely to have accrued since the common origin of life on Earth

Explanation:

Answer :position

Explanation:

Potential energy is the energy stored in an object due to its position

The structure of this product is 2-aminopentanedioic acid, also known as glutamic acid. H₂N-C(=O)-CH₂-CH₂-COOH

The reaction between pentanedioic anhydride and ammonia involves the addition of ammonia to the anhydride to form an amide. The amide formed is a primary amide since it has only one nitrogen atom attached to the carbonyl carbon of the anhydride.

The molecular formula of the product is C₅H₇NO₂, which corresponds to a molecular weight of 113 g/mol. Since the product is an amide, it can be represented as RCONH₂, where R is the remainder of the molecule.

The structure of the product can be deduced by considering the reactants and the molecular formula of the product. The anhydride has two carbonyl groups, and one of these is converted into a primary amide by the reaction with ammonia. Therefore, the product must contain an amide group and a carbonyl group.

The product can be represented as follows;

H₂N-C(=O)-CH₂-CH₂-C(=O)-R

where R is the remainder of the molecule. Since the molecular formula of the product is C₅H₇NO₂, R must contain three carbon atoms, two hydrogen atoms, and one oxygen atom.

One possible structure for the product is 2-aminopentanedioic acid, also known as glutamic acid. The structure of glutamic acid is as follows;

H₂N-C(=O)-CH₂-CH₂-COOH

Glutamic acid is an amino acid that is an important neurotransmitter in the central nervous system. The reaction of pentanedioic anhydride with ammonia at elevated temperature may lead to the formation of glutamic acid, which has the molecular formula C₅H₇NO₂.

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Answer:  \(CaCO_3(s)\rightarrow CaO(s)+CO_2(g)\) , 0.533 L

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

\(CaCO_3(s)\rightarrow CaO(s)+CO_2(g)\)

According to avogadro's law, 1 mole of every substance occupies 22.4 L of volume at STP.

Number of moles =\(\frac{\text {given mass}}{\text {Molar mass}}\)

moles of calcium carbonate = \(\frac{2.38g}{100g/mol}=0.0238mol\)

As 1 mole of calcium carbonate produces = 22.4 L of carbon dioxide at STP

Thus 0.0238 moles of calcium carbonate produces =\(\frac{22.4 L}{1}\times 0.0238=0.533L\) of carbon dioxide at STP

The balanced equation is \(CaCO_3(s) \rightarrow CaO(s) + CO_2(g)\)

The number of liters of carbon dioxide that should be produced is 0.533L

As per this law, the mass could neither be developed nor be destroyed. So, the mass of products should be equivalent to the mass of reactants. The number of atoms of every element has to be the similar on reactant and product sides. Due to this, the chemical equations are balanced.

\(CaCO_3(s) \rightarrow CaO(s) + CO_2(g)\)

As per this law,  1 mole of every substance occupies 22.4 L of volume at STP.

So,

We know that

Number of moles = \(given\ mass \div molar\ mass\)

Now the moles of calcium carbonate is \(= 2.38 \div 100\) = 0.0238 mol

Since 1 mole of calcium carbonate generated = 22.4 L of carbon dioxide at STP

So, 0.0238 moles of calcium carbonate generated

\(= 22.4 \div 1 \times 0.0238 \\\\= 0.533L\)

 of carbon dioxide at STP

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The answers include the following:

This is referred to as the largest organ in the body which has a rich network of nerves and blood vessels and is responsible for protecting the body from pathogens and other foreign bodies.

Living organisms such as humans have different skin colors and is based on the amount of the protein known as melanin present in it .The color of the skin of a chicken wing ranges from white to yellow and is attached to the subcutaneous tissue.

This type of tissue is responsible for connecting the skin to the muscles and bones which are present in the body so as to perform functions necessary for the survival of the animal.

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Explanation:

Find moles first

moles = number of particles/ 6×10^23

= 7.52 ×10^25 / 6×10^23

=125.33

calculate molar mass

(1×14) +(3×1) =17

convert to mass

mass= moles × molar mass

=125.33 × 17

=2130.67g

This is a pretty big value usually it's smaller but I'd assume it's because the number of particles was large.

Because the cuvette's walls can vary in breadth, this is the case. If you don't enter it exactly the same way each time, it will change how much light passes through the sample and will have an impact on your results.

The cuvette has a line that must line up with the sample holder's line because of this. hence, readings had no impact.

The cuvette's route length in the spectrophotometer should always stay the same.

This is because the radiation should have a constant path length as it goes through the sample inside the cuvette. By doing this, the cuvette through which the light will travel won't get scratched.

Scratches on the cuvette will result in inaccurate measurements of the concentration or absorbance that is being assessed, producing inaccurate findings.

Therefore, the line on the cuvette is always aligned with that of the sample holder in order to establish a uniform path length and obtain accurate findings.

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One example of particles that can be drawn closer to occupy a smaller volume is a gas.

In the gaseous state, particles have high kinetic energy and are not strongly attracted to each other. They move freely and randomly, colliding with each other and the container walls.

Since there are minimal intermolecular forces holding them together, gas particles can be compressed or drawn closer together by reducing the volume of the container.

By decreasing the volume of a gas, such as by compressing it in a cylinder or container, the particles have less space to move around. They collide with each other more frequently, increasing the frequency of intermolecular collisions. As a result, the gas particles are drawn closer together, and the overall volume occupied by the gas decreases.

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The elements with the corresponding letters are Carbon (C), Krypton (Kr), Calcium (Ca), and Scandium (Sc)

The electrons in an atom's highest occupied main energy level are known as valence electrons. The two electrons in the 1s sublevel of second period elements are known as inner-shell electrons and are not directly involved in the reactivity of the element or the production of compounds.

You are aware that the number of protons in the nucleus and electrons encircling the nucleus must be equal in a neutral sodium atom. As a result, sodium possesses one electron on its third energy level, or 3s sublevel.

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Answer:

Kb = 2.23 x 10⁻⁵

Explanation:

Benz-CO-NH₂ + H₂O => Benz-CO-NH₃⁺OH⁻ ⇄ Benz-CO-NH₃⁺ + OH⁻

given pOH = 2.91 => [OH⁻] = 10E-2.91 = 1.23 x 10⁻³M

                         Benz-CO-NH₃⁺OH⁻ ⇄ Benz-CO-NH₃⁺   +       OH⁻

At Equilibrium           0.68M                    1.23 x 10⁻³M          1.23 x 10⁻³M

Kb = [Benz-CO-NH₃⁺][OH⁻]/[ Benz-CO-NH₃⁺OH⁻]

= (1.23 x 10⁻³)² M²/ 0.068M = 2.23 x 10⁻⁵

Answer:

When two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

Answer:

d.the gases x and y are elements ​

Explanation:

Since it is impossible to further break down the gases produced during this electrolytic process, we can conclude that the gases x and y are elements.

An element is a distinct substance that cannot be split up into simpler substances. Such substances are made up of only one kind of atom.

It is impossible through chemical reactions split an element into simpler units.