calculate the theoretical yield of aspirin given that 0.914-g of salicylic acid was reacted with excess acetic anhydride.

Peroxides species shows the correct charge of the oxide ion.

As predicted by the two partially filled outer orbitals, oxygen assumes a negative oxidation state in all of its molecules. The oxide ion O2 is produced when electron transport fills these orbitals. It is thought that each oxygen in peroxides (species that contain the ion O2 2) has a charge of 1.

The carbon and hydrogen atoms have a slight positive charge, while the oxygen atom has a slight negative charge.

There are six valence electrons in the atom of oxygen. The oxygen atom requires two additional electrons in order to complete its valence shell. Adding two more electrons gives the oxygen ion a charge of two because each electron has a single negative charge.

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Answer:

Isotopes

Explanation:

Isotopes are atoms of the same element that contain an identical number of protons, but a different number of neutrons. Despite having different numbers of neutrons, isotopes of the same element have very similar physical properties.

The standard enthalpy change (ΔH°) for the reaction C2H6 + 2Cl2 → C2H4Cl2 + 2HCl is 151.5 kJ/mol.

To calculate the standard enthalpy change (ΔH°) for the given reaction, we need to use the bond energies of the molecules involved.

The balanced chemical equation for the reaction is:

C2H6 + 2Cl2 → C2H4Cl2 + 2HCl

The bond energies (in kJ/mol) are:

C-C: 347

C-H: 413

C-Cl: 339

Cl-Cl: 242

H-Cl: 431

The ΔH° for the reaction can be calculated using the formula:

ΔH° = (Σ bond energies of reactants) - (Σ bond energies of products)

ΔH° = [2(C-C) + 6(C-H) + 4(Cl-Cl)] - [1(C2H4Cl2) + 2(H-Cl)]

ΔH° = [2(347) + 6(413) + 4(242)] - [1(364) + 2(431)]

ΔH° = 151.5 kJ/mol

Therefore, the value of ΔH° for the given reaction is 151.5 kJ/mol.

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The two changes that can be classified as physical are as follows:

A physical change in chemistry is a change affecting the form of a chemical substance, but not its chemical composition.

When matter changes its observable properties, we can say it has undergone a physical change.

Physical change is a type of change where the physical properties of matter change. Physical changes include;

Therefore, melting of ice, which is a change of state and shattering of glass are examples of physical change.

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Answer:

Option D

Explanation:

As we know at

PV = nRT

at STP,

Pressure is  1 atm and temperature is 273 K

\(\frac{P_2}{P_1} = \frac{T_2}{T_1} \\P_2 = 1*(428 )/273\\P_2 = 1.567\)

Hence, option D is correct

Answer:  g/mol

Explanation:

The gram formula mass of  CuSO 4  is  159.60 g/mol  

Multiply the subscript for each element by its molar mass (atomic mass on periodic table in g/mol). Then add the results. This will give you the molar mass of the compound (mass of 1 mole).

Cu : ( 1 × 63.546 g/mol )   = 63.546 g/mol

S : ( 1 × 32.065 g/mol )      = 32.06 g/mol

O : ( 4× 15.999 g/mol )     =  63.996 g/mol

CuSO 4 :  63.546 g/mol  +  32.06 g/mol  + 63.996 g/mol  = 159.60 g/mol  (rounded to two decimal places)

Answer:

This is what I think, so hopefully it's right!

A= 8 B= 8 C= 0 D= 26 E= 30 F= Fe

I hope this helped! :)

The pH of a buffer solution containing 0.25 M NH3 and 0.45 M NH4Cl can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([NH4Cl]/[NH3]), where pKa is the dissociation constant of NH4+ (9.25 at 25°C).

The concentration ratio [NH4Cl]/[NH3] is 0.45/0.25 = 1.8. Plugging these values into the equation gives pH = 9.25 + log(1.8) = 9.62.
If 2 mL of 0.2 M NaOH is added to 75 mL of this buffer, the new concentration of NH3 will be 0.25 M and the new concentration of NH4Cl will be 0.45 M + (2 mL/1000 mL)(0.2 M) = 0.494 M. The new concentration ratio [NH4Cl]/[NH3] is 0.494/0.25 = 1.976. Plugging this ratio into the Henderson-Hasselbalch equation gives pH = 9.25 + log(1.976) = 9.68.

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Adding too much HCl too quickly could cause the formation of a large amount of precipitate, making it difficult to observe the reactions and determine the presence or absence of the ions.

The beginning of nucleation is a crucial phase of precipitation. The construction of an interface with the solution is implied by the production of a solid particle. This involves energy changes dependent on the relative surface energy created between the solid and the solution and the dissolving reaction free energy (endothermic or exothermic process followed by a rise in entropy). Without adequate nucleation sites or in the absence of favourable energy shifts, there is no precipitation, and the solution remains supersaturated.

When a compound's concentration exceeds its solubility, precipitation may result. This could result from changes in temperature, solvent evaporation, or solvent mixing. Strongly supersaturated solutions produce precipitation more quickly.

A chemical reaction may lead to the precipitate's production. A white barium sulphate precipitate is created when a barium chloride solution combines with sulfuric acid. A yellow precipitate of lead(II) iodide is created when a potassium iodide solution combines with a lead(II) nitrate solution.

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Answer:

Germanium or Ge

Explanation:

It is on the perioidic table. Gallium has an atomic number of 31 and Germanium has an atomic number of 32.

The statement that is incorrect about chemical equilibrium is that forward and reverse reactions have stopped. The correct option is c) Forward and reverse reactions have stopped.

What is chemical equilibrium?

Chemical equilibrium refers to the state of a reversible reaction where the rate of the forward reaction equals the rate of the reverse reaction, and the concentrations of the reactants and products do not change with time. In other words, chemical equilibrium refers to the point at which the concentrations of chemical species no longer change.

How do you know when equilibrium has been reached?

Equilibrium has been reached when the rate of the forward reaction equals the rate of the reverse reaction, and the concentrations of the reactants and products no longer change with time. This means that the concentrations of the reactants and products will remain constant. So, the correct option is d) Equilibrium has been reached when the concentrations of chemical species are no longer changing.

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According to forces of attraction, hydrogen bonding between water molecules is responsible for it's surface tension.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

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The first step in this calculation is to know how many liters is equal to 1 gallon, and the value is 3.785 liters, so now we have to make the following calculation:

1 gal = 3.785 Liters

30.0 gal = x Liters

x = 3.785 * 30.0

x = 114 Liters

Answer:

D) C5H12

Explanation:

The rate of evaporation of a solution depends on the nature of intermolecular forces in the solution. The stronger the magnitude of intermolecular forces present the lower the rate of evaporation.

If we consider the compounds; C7H15OH, C7H15NH2 and C6H13COOH, the presence of polar groups implies that dipole-dipole interactions are present in the molecule leading to stronger intermolecular interaction and a slower rate of evaporation.

On the other hand; C7H16 and C5H12 are alkanes. The intermolecular forces that exists between their molecules is the weak dispersion forces. However, the magnitude of dispersion forces increases as the molecular mass of the compound increases.

Hence, C5H12 has the fastest rate of evaporation since it has the lowest molecular mass.

The magnesium is the anode of a magnesium and zinc galvanic cell.

The magnesium is the anode means the site of oxidation, where magnesium ions flow into solution. Here the electrons leave the electrode and flow through the voltmeter as they move to the zinc cathode.

While on the other hand, zinc is the cathode i.e. the site of reduction, where zinc ions flow onto the electrode in order to pick up electrons so we can conclude that magnesium is the anode of a magnesium and zinc galvanic cell.

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Answer:ANSWER IS MG(s)

Explanation:

Answer:

protons and neutrons are the answer

Answer:

don't know

Explanation:

Thanks❤ have a nice day

Answer:

Liquid

Explanation:

Octane is a straight chain alkane composed of 8 carbon atoms. It has a role as a xenobiotic. N-octane is a colorless liquid with an odor of gasoline.

The mass of sucrose that is hydrolyzed when 2.60 l of a 0.160 m sucrose solution is allowed to react for 200 minutes is 106 g.

The following information in the complete question;

Rate constant (k) = 1.8 x 10^-4 s^-2

Initial concentration (Ao) = 0.130 M

Time is taken =  190 minutes or 11400 seconds

Final concentration (A) =?

Given that;

lnA = lnAo - kt

A = e^ lnAo - kt

A = e^[(ln0.130) - ( 1.8 x 10^-4  x  11400)

A = 0.017 M

Now;

n = CV

n = Number of moles

C = Molar concentration

V = volume

After hydrolysing the number of moles = 0.017 M ×  2.75 L

= 0.047 moles

Before hydrolysing number of moles =0.130 M  ×  2.75 L = 0.358 moles

Hydrolysed number of moles include=  0.358 moles - 0.047 moles = 0.311 moles

Mass = Number of moles × molar mass

Molar mass of sucrose = 342 g/mol

Mass =   0.311 moles × 342 g/mol

Mass = 106 g

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1) Convert grams to moles

The molar mass of Cu is 63.546 g/mol.

0.007553 mol of Cu is equal to 7.6*10^-3 mol of Cu.

.

The smallest particle of an element, an atom, can be split into smaller components by either a physical or chemical change.

The smallest particle of an element that retains its chemical properties is an atom. Atoms are considered the fundamental building blocks of matter. Generally, atoms cannot be split into smaller components while maintaining their elemental identity. However, there is a type of change known as nuclear fission that can split the nucleus of an atom into smaller fragments.

Nuclear fission is a nuclear reaction in which the nucleus of an atom is bombarded with a neutron, causing it to become unstable. This instability leads to the splitting of the atomic nucleus into two or more smaller nuclei, along with the release of a large amount of energy. This process is commonly observed in nuclear power plants and nuclear weapons.

The nuclear fission involves changes at the atomic nucleus level and is distinct from chemical changes, which involve the rearrangement of electrons in atomic orbitals. Chemical changes, such as chemical reactions, do not split the atom into smaller components.

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Answer:

Lowers the freezing point

Explanation:

Lowers the freezing temp

"Freezing point depression is a colligative property observed in solutions that results from the introduction of solute molecules to a solvent. The freezing points of solutions are all lower than that of the pure solvent and is directly proportional to the molality of the solute."

Answer: The temperature at which the solution freezes is lowered

Explanation:

The name used for the ionic compound Co₂(SO₄)₃ is cobalt(III) sulfate. Hence, Option (2) is correct.

Cobalt sulfate is used in electroplating baths, storage batteries, sympathetic inks, and as an additive to soils and animal feeds etc.

Cobalt sulfate is a water-soluble cobalt salt with a variety of industrial and agricultural uses. Several cobalt compounds have induced sarcomas at injection sites in animals, and reports have suggested that exposure to cobalt-containing materials may cause lung cancer in humans.

Usually cobalt sulfate refers to the hexa- or heptahydrates CoSO₄6H₂O or CoSO₄7H₂O, respectively. The heptahydrate is a red solid that is soluble in water and methanol

Therefore, The name used for the ionic compound Co₂(SO₄)₃ is cobalt(III) sulfate. Hence, Option (2) is correct.

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Yeast is a type of fungus that can ferment certain substances, meaning it breaks down sugars and converts them into alcohol and carbon dioxide. The ease with which a substance is fermented by yeast depends on a few factors, including the type of yeast being used and the composition of the substance itself.

Generally speaking, substances that contain a high amount of simple sugars are more easily fermented by yeast. This is because yeast is able to quickly and efficiently break down these sugars into alcohol and carbon dioxide. Examples of substances that are easily fermented by yeast include fruit juices, honey, and molasses.

On the other hand, substances that are more complex or contain less sugar may be more difficult for yeast to ferment. For example, yeast may have a harder time breaking down starches, such as those found in grains, without additional processing steps.

It's worth noting that different strains of yeast may also have varying levels of ability to ferment certain substances. Some strains may be better suited for fermenting certain types of beer or wine, for example, while others may be more effective at fermenting bread dough.

Overall, the ease with which a substance is fermented by yeast depends on a variety of factors, and may require some trial and error to determine the best approach for a particular substance.

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Answer: true

Explanation:

Answer:

S=  2(1)  = 2

O=  2(4)  = 8

Na= 2(2)  = 4

Explanation:

The given compound is:

          2Na₂SO₄  

An element is a distinct substance that cannot be split up into simpler substances.

So;

  Number of atoms of elements here are:

S=  2(1)  = 2

O=  2(4)  = 8

Na= 2(2)  = 4

Answer:

down syndrome is research because you research the three sets of chromosome 21

Explanation:

Two Cl-atoms form a sigma bond with sp3 hybrid orbitals. Thus, SCl2 has sp3 hybridization.

The Lewis structure shows us that the carbon atom makes 4 sigma bonds to hydrogen and has no non-bonding electron pairs. The central carbon atom combines its 2s, 2px, 2py, and 2pz valence orbitals to make four, 2sp3 hybrid orbitals. Each one of these combines with a 1s atomic orbital from a hydrogen atom.

What is hybridization of SCl2?

In its most stable state, Sulfur acts as the central atom and forms two covalent bonds with the Chlorine atoms. It also possesses two lone pairs. Due to the presence of 4 electron domains and its steric number being 4, the hybridization of SCl2 is given by sp3.

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Explanation:

Concentrated solution Dilute solution

A concentrated solution is a liquid with a high solute concentration. A dilute solution is a liquid having a lower solute content.

As more solute is added to a solution, the solution becomes more concentrated. The dissolved salt in drinking water from a well is a dilute solution.

A concentrated solution contains a substantial volume of water. The concentration of a solution can be further reduced and diluted by adding more water.