Which of these types of changes is a physical change?
A. Breaking apart one substance into two substances
B. Dissolving one substance in another
C. Changing one substance into another
D. Making a new substance
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Answer:

A photon

Explanation:

Hope it helps!

Answer:

The correct answer is C.) 67% sulfur and 33% oxygen

Explanation:

The total mass of the compound is 40 grams of sulfur + 60 grams of oxygen = 100 grams. To find the percent composition of sulfur, we divide 40 grams by 100 grams and multiply by 100:

(40 g / 100 g) * 100% = 40%

To find the percent composition of oxygen, we divide 60 grams by 100 grams and multiply by 100:

(60 g / 100 g) * 100% = 60%

So the compound contains 67% sulfur and 33% oxygen.

The molar concentration of the weak acid solution is 0.09308 M.

To determine the molar concentration of the weak acid solution, we need to use the balanced chemical equation for the reaction between the weak acid and the strong base NaOH:

HA + NaOH → NaA + H2O

where HA is the weak monoprotic acid and NaA is its corresponding sodium salt.

At the stoichiometric point of the titration, all of the weak acid has reacted with the strong base, and the number of moles of NaOH used is equal to the number of moles of weak acid present in the original solution:

n(HA) = n(NaOH)

We can use the molarity and volume of NaOH used to calculate the number of moles of NaOH used:

n(NaOH) = M(NaOH) × V(NaOH)

= 0.0981 mol/L × 23.74 mL / 1000 mL/L

= 0.002327 moles

Since the molar ratio of HA to NaOH in the balanced equation is 1:1, the number of moles of HA in the original solution is also 0.002327 moles.

To calculate the molar concentration of the weak acid solution, we divide the number of moles of HA by the volume of the original solution used in the titration:

M(HA) = n(HA) / V(HA)

= 0.002327 moles / 25.0 mL / 1000 mL/L

= 0.09308 mol/L

Therefore, the molar concentration of the weak acid solution is 0.09308 M.

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Chemical substances known as oxygenates have oxygen as one of their constituent parts. Tech B is correct

Although technically any substance containing oxygen qualifies as an oxygenate, the term is most frequently used to refer to substances added to internal combustion engine vehicles.

Oxygenate fuel additives are either alcohols, like ethanol, or ethers, with methyl tertiary butyl ether, or MTBE, being the most often used. Any chemical compound that has at least one hydroxyl group, which is made up of oxygen and hydrogen and is connected to the carbon atom in an alkyl group, is referred to as alcohol. Alkyl groups are made up of hydrogen and carbon atom chains.

Alcohols are a crucial group in organic chemistry despite their lack of chemical specificity because of how many different compounds they can originate from and be transformed into.

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The reaction of chlorobenzene is

\(C_6H_6 + HNO_2 + HCl-- > C_6H_5N_2Cl + H_2O\\C_6H_5N_2Cl + CuCl + HCl-- > C_6H_5Cl + CuCl_2 + N_2\)

The transformation of benzene to chlorobenzene through a diazonium intermediate involves the following steps:

Step 1: Diazotization

Benzene is first converted to a diazonium salt using nitrous acid and hydrochloric acid (HCl) at low temperatures.

\(C_6H_6 + HNO_2 + HCl-- > C_6H_5N_2Cl + H_2O\)

Step 2: Replacement of Diazonium group with Chlorine

The diazonium salt is then treated with cuprous chloride (CuCl) in the presence of hydrochloric acid (HCl) to replace the diazonium group with a chlorine atom to form chlorobenzene.

\(C_6H_5N_2Cl + CuCl + HCl-- > C_6H_5Cl + CuCl_2 + N_2\)

The overall reaction is:

\(C_6H_6 + HNO_2 + HCl-- > C_6H_5N_2Cl + H_2O\\C_6H_5N_2Cl + CuCl + HCl-- > C_6H_5Cl + CuCl_2 + N_2\)

The final product is chlorobenzene, which is formed by the replacement of the diazonium group with a chlorine atom.

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An indicator is added during an acid-base titration to visually indicate the endpoint of the titration. The endpoint is the point at which the acid and base have completely reacted with each other in stoichiometric amounts, resulting in a neutral solution.

During the titration, the acid and base are gradually added to each other until the endpoint is reached. At this point, the indicator changes color, indicating that the neutralization reaction is complete and the titration can be stopped.

The purpose of adding an indicator is to make it easier to determine the endpoint of the titration. Without an indicator, it can be difficult to determine when the neutralization reaction is complete. The indicator changes color at or very near the endpoint, providing a clear visual signal that the reaction is complete.

Different indicators are used depending on the type of acid-base titration being performed. For example, phenolphthalein is commonly used as an indicator in acid-base titrations because it changes color in the pH range of 8.2 to 10, which is near the endpoint of many acid-base titrations.

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To achieve a desired pH of 8.0, approximately 19.17 mL of 6.0 M HCl must be added to 1 L of 0.10 M HEPES solution.

To calculate the volume of 6.0 M HCl required, we can use the Henderson-Hasselbalch equation, which relates the pH of a buffer solution to the pKa and the ratio of the concentrations of the conjugate acid and base.

The Henderson-Hasselbalch equation is given by:

pH = pKa + log([A-]/[HA])

In this case, HEPES acts as a buffer and has a pKa value. The conjugate base of HEPES is A-, and the acid form is HA. We want to achieve a pH of 8.0, and the pKa of HEPES is approximately 7.55.

By rearranging the equation, we get:

log([A-]/[HA]) = pH - pKa

Taking the antilog of both sides, we have:

[A-]/[HA] = 10^(pH - pKa)

Substituting the given values, we get:

[A-]/[HA] = 10^(8.0 - 7.55)

[A-]/[HA]  = 3.162

Now, the concentration of [A-] and [HA] depends on the initial concentration of the HEPES solution. Let's assume we have 1 L of 0.10 M HEPES, so the concentration of [A-] is 0.10 M and the concentration of [HA] is 0.10 M.

To calculate the volume of 6.0 M HCl required, we can set up a proportion:

0.10 M / 0.10 M = (0.10 M + x mL * 6.0 M) / (0.10 M)

Simplifying the equation, we get:

1 = 0.10 + 6.0x

6.0x = 0.90

x = 0.90 / 6.0

x ≈ 0.15 L

x = 150 mL

Therefore, approximately 150 mL of 6.0 M HCl needs to be added to 1 L of 0.10 M HEPES to achieve the desired pH of 8.0.

To achieve a pH of 8.0 in a 1 L solution of 0.10 M HEPES, approximately 150 mL of 6.0 M HCl should be added. It is essential to handle the corrosive HCl with caution and take appropriate safety measures.

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Copper has the highest conductivity of any metal used in electronics. The statement is false.

Silver is the element that conducts electricity the best, followed by copper and gold.

The earth's most conductive metal is by far silver. Silver only has one valence electron, which explains this. This one electron can also go about freely and encounter little opposition. As a result, some of the metals with this particular property are silver and copper.

Silver is the metal with the highest thermal and electrical conductivity because of its distinctive crystal structure and lone valence electron.

Since copper is the non-precious metal with the highest conductivity, it has a higher electrical current carrying capacity than other non-precious metals. The strength of the metal rises when tin, magnesium, chromium, iron, or zirconium are added to copper to create alloys, but its conductivity decreases.

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Chromatography is primarily used as a method for the analysis and separation of chemical mixtures. Chromatography is the process of causing the constituent parts of a mixture to migrate differently from a restricted starting point in a particular medium, in this case, filter paper.

A) The air pressure above the beaker would disrupt the flow of the spots through the TLC, resulting in less resolution on the TLC plate, if the watch glass is not kept above the beaker for running paper chromatography. Despots would look, and even swarm, as a result.

B) The solvent is not allowed to move completely through the TLC plate because if the chromatogram is left in the beaker for a long time so that the solvent completely flows to the top, all of the spots would reach the solvent front and we would be unable to distinguish between the spots present in the TLC plate.

C). The TLC spotting should be performed in a very minute manner. Assume that if this substance is quite thick and a few of spots are seen apart, the TLC plate would drag and the resolution would be thrown off. As a result, it is challenging to tell the spots apart.

D). If the chromatographic paper is very short, it will be difficult to distinguish between the spots because, if more than one spot is present in a given compound, it will be harder to determine how many spots there are if there is a smaller distance between them. The TLC sheet's shorter length is the cause of the decreased space between the supports. Therefore, it is preferable to avoid using this longer TLC sheet so that the resolution is high and the spots can be easily identified.

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The amount of a solute present in a specific amount of solvent or solution is known as the concentration of a solution in chemistry. Controlling the stoichiometry of reactants for solution reactions requires knowledge of the solute concentration.

Molarity (M):

Molarity is one of the most widely used ways to express concentrations. It is the quantity of moles of solute dissolved in a solution that is one litre in size.

Molarity, the most typical unit of concentration, is also the most helpful when calculating the stoichiometry of reactions in solution. The number of moles of solute contained in exactly 1 L of solution is known as the molarity (M) of a solution.

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pH of the solution is 13.90.

The concentration of hydrogen (H+) ions in a solution, which is a measurement of acidity, is known as the pH of that solution. In pure water, hydrogen and hydroxyl (OH) ions are found in almost equal amounts.

A solution is acidic when there are too many hydrogen ions present, while a solution is basic when there are too few H+ ions or too many hydroxyl ions. The product of the concentrations of H+ and OH is the equilibrium constant for this reaction, Kw, which equals 10^14.

Mass of lithium = 4.8 g

Volume of the solution = 250 mL

[H3O+] = Kw/ [OH-]

Where,

[H3O+] : hydronium ion concentration

[OH-] : hydroxyl ion concentration

Kw : Equilibrium constant

moles of LiOH = 4.8/23.95 = 0.20 moles

strength of LiOH = 4 x 0.20 = 0.80 M

[H3O+] = Kw/ [OH-] = 10^(-14) / 0.80 = 1.25 x 10 ^(-14)

pH = - log [H3O+]

pH = - log ( 1.25 x 10 ^ (-14)) = 13.90

Therefor, pH is 13.90

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Answer:

O₂ is the limiting reactant

0.406 moles of ammonia remains after the reaction goes complete.

Explanation:

Balanced reaction is:

4NH₃  + 5O₂  →  4NO  +  6H₂O

Let's determine the moles of each reactant:

12 g . 1mol / 17g = 0.706 moles of ammonia.

12 g . 1mol / 32g = 0.375 moles of oxygen.

4 moles of ammonia react to 5 moles of oxygen

Then, 0.706 moles of ammonia may react to (0.706 . 5) /4 = 0.882 moles

We only have 0.375 moles of oxygen and there are needed 0.882. O₂ is the limiting reactant. Definetely ammonia is in excess.

5 moles of oxygen react to 4 moles of ammonia

Our 0.375 moles may react to (0.375 . 4) / 5 = 0.3 moles

We have 0.706 moles of NH₃ and we only need 0.3

After the reaction goes complete (0.706 - 0.3) = 0.406 moles of ammonia still remains.

Answer:

I think C because it is an outlier and could of been experimented on a different surface or different car

Answer: 56.7s should be thrown out.

Hope that helps :)

Answer:

Isotopes.

Explanation:

Atoms of the same element that have different numbers of neutrons but the same number of protons are called Isotopes.

option A is correct.biotic is a nother word for living

Answer:

option A would be the correct answer for the question below.

Explanation:

Which describes a similarity between abiotic and biotic factors?

Alkenes are unsaturated hydrocarbons with a double bond between carbon atoms. This double bond is a region of high electron density, making it susceptible to attack by electrophilic reagents like bromine.

When alkenes react with bromine, the double bond breaks, and a new bond forms between the carbon and bromine atoms. This process is known as addition reaction, and it is a characteristic of alkenes.
Bromine can react with alkenes in two ways: in the cold with pure liquid bromine or with a solution of bromine in an organic solvent like tetrachloromethane. In either case, the reaction results in the formation of a colorless liquid, as the red-brown color of the bromine disappears upon reaction.
In the case of ethene, the reaction with bromine yields 1,2-dibromoethane. This compound is formed when each carbon atom of the double bond becomes attached to a bromine atom. The resulting product is a saturated hydrocarbon with two bromine atoms bonded to it.

Overall, the reaction between alkenes and bromine is a useful method for synthesizing new compounds. By breaking the double bond and forming a new bond with bromine, alkenes can be transformed into new and more complex molecules.

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Assuming all orbitals are in the same energy level, the orbital with the lowest energy is the s orbital.

In the context of the electronic structure of atoms, orbitals are grouped into different energy levels, with each energy level containing one or more sublevels. The energy levels are labeled using the principal quantum number (n), with higher values of n corresponding to higher energy levels.

Within a given energy level, the s orbital is always the orbital with the lowest energy. This is because the s orbital has a spherical shape and is located at the center of the atom. It is shielded from the nuclear charge by the other electrons in the atom, resulting in a lower energy compared to other orbitals within the same energy level.

The p orbitals, on the other hand, have slightly higher energy than the s orbital within the same energy level. The p orbitals are dum bbell-shaped and are oriented along the x, y, and z axes. They have a higher energy due to their orientation and their closer proximity to the nucleus.

Similarly, the d and f orbitals, which exist in higher energy levels, have even higher energies compared to the s and p orbitals within their respective energy levels.

Therefore, if all the orbitals are in the same energy level, the s orbital will have the lowest energy among them.

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Answer:

2

Explanation:

Answer:

Suspension

Explanation:

A suspension is a heterogeneous mixture in which some of the particles settle out of the mixture when left undisturbed. The particles in a suspension are far larger than those of a solution, so gravity is able to pull them down out of the water.

The nucleus more easily, increasing the probability of causing fission many nuclei like U234, U236, and U238 undergo fission only by fast neutrons.

Fission can be caused by slow as well as fast neutrons. It is the energy of the neutron which determines its effectiveness in causing fission. Fast neutrons are more effective in causing fission. Hence, many nuclei like U234, U236, and U238 undergo fission only by fast neutrons.

Fission is a nuclear reaction process in which the nucleus of an atom is split into two smaller nuclei with the release of a large amount of energy and two or three neutrons. Uranium-235 (U-235) and Plutonium-239 (Pu-239) are the most commonly used fissile materials, but other materials like U-234, U-236, and U-238 can also undergo fission. When a neutron is absorbed by the nucleus of a fissile material like U-235 or Pu-239, it becomes unstable and splits into two smaller nuclei with the release of a large amount of energy.

The fission process also releases two or three neutrons, which can cause further fission of other nuclei, leading to a chain reaction. The chain reaction can be controlled by using a neutron moderator, which slows down the fast neutrons, making them more effective in causing fission. The efficiency of the fission reaction depends on the energy of the neutron.

Fast neutrons are more effective in causing fission than slow neutrons, which have less energy. This is because fast neutrons can penetrate the nucleus more easily, increasing the probability of causing fission. Hence, many nuclei like U234, U236, and U238 undergo fission only by fast neutrons.

Fast neutrons are more effective in causing fission than slow neutrons, which have less energy.

This is because fast neutrons can penetrate the nucleus more easily, increasing the probability of causing fission. Hence, many nuclei like U234, U236, and U238 undergo fission only by fast neutrons.

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The moles of CO2 are in the tank is mathematically given as

n=1.431

Question Parameters:

A 10-liter tank of CO2 is at a pressure of 3.5 atm and a temperature of

25°C.

Generally, the equation for the ideal gas  is mathematically given as

PV=nRT

Therefore

n=PV/RT

n=354.638kpa*10/8.314 J/mol·K *298k

n=1.431

In conclusion,  moles of CO2 is in the tank is

n=1.431

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The functional groups can be identified via IR Spectroscopy, which monitors atom vibrations.

It is feasible to identify the functional groups using IR Spectroscopy, which monitors the atoms' vibrations. 5 Typically, lighter atoms and stronger connections will vibrate with a higher stretching frequency (wavenumber).

IR spectra of solids and liquids are often produced using straightforward liquid cells after the sample has been dissolved in a solvent that is moderately IR transparent, like CCl4. Another method for studying a solid directly involves grinding it into a fine paste using NUJOLTM, a blend of highly pure hydrocarbons.

The process involves passing infrared light through the organic compound we wish to identify; some of the frequencies are absorbed by the compound, and if we keep track of the light that passes through, the precise frequencies of the absorptions may be determined.

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Answer:

Differences in melting points between graphite and butter is how their atoms are fixed structurally. Graphite consists of carbon atoms that have covalent bonding with a compact hexagonal arrangement that gives a lot of stability to the compound and makes its melting point elevated to approximately 3500oC.

The allotropes of carbon are diamond and graphite. The allotropes can have same or different physical or chemical properties. Therefore,  differences in melting points between graphite and butter is due difference in structure.

Allotropy is a property by which an element exist in more than one form. The different forms of element are called allotropes.

The features of graphite are :

1.Graphite form strong covalent bonds.

2. Graphite has delocalized electrons but they don't have metallic bonding.

3. There are total four electrons per carbon but only three electrons are available for covalent bond. One electron per carbon is responsible for delocalization.

4. Graphite forms a giant structures.

Graphite consists of carbon atoms that have covalent bonding with a compact hexagonal arrangement that gives a lot of stability to the compound and makes its melting point elevated.

Therefore, differences in melting points between graphite and butter is due difference in structure.

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To determine the molar concentration of the hydrochloric acid (HCl) solution, we need to use the information provided about the mass of anhydrous sodium carbonate and the volume of HCl solution used in the titration.

Given:

Mass of anhydrous sodium carbonate: 0.338 g

Volume of HCl solution used: 15.3 mL

First, we need to convert the volume of the HCl solution to liters:

Volume of HCl solution = 15.3 mL = 0.0153 L

Next, we need to determine the number of moles of anhydrous sodium carbonate (Na2CO3) using its molar mass. The molar mass of Na2CO3 is 105.99 g/mol.

Number of moles of Na2CO3 = Mass / Molar mass

Number of moles of Na2CO3 = 0.338 g / 105.99 g/mol

Now, since the balanced chemical equation between Na2CO3 and HCl is 1:2, we can determine the number of moles of HCl required for the reaction.

Number of moles of HCl = (Number of moles of Na2CO3) * 2

Next, we calculate the molar concentration of the HCl solution using the moles of HCl and the volume of the HCl solution.

Molar concentration of HCl = (Number of moles of HCl) / Volume of HCl solution

Substituting the values:

Molar concentration of HCl = (0.338 g / 105.99 g/mol) * 2 / 0.0153 L

Calculating the value:

Molar concentration of HCl ≈ 0.442 mol/L

Therefore, the molar concentration of the hydrochloric acid (HCl) solution is approximately 0.442 mol/L.

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Answer: Yes it can help make cake rise.

Explanation: Its a leavening agent and its a good ingredient for baking.

A polyatomic ion composed of an element, usually a nonmetal, bonded to one or more oxygen atoms. ... Explain what determines the ratio of positive ions to negative ions in an ionic crystal. The ratio is determined by the number of electerons transferred from the metal atom to the nonmetal atom.

The percent yield of a reaction simply indicates how many actual grams of a specific product will be produced as opposed to the theoretical 100 grams.

The simple formula for calculating a reaction's percent yield is to divide the reaction's actual yield, or what it actually produces, by its theoretical yield, or what it should theoretically generate, and then multiply the result by 100.

% yield = (What you acutally get/what you should theoretically get) X 100

The reaction in your instance is said to have a theoretical yield of 15.3 g. This indicates that the reaction will result in 15.3 g of product if all the moles of reactants involved in the reaction are converted to moles of product.

The reaction's actual yield is reported to be 14.8 g, which indicates that it falls short of producing the full amount of product predicted, or a 100% yield.

The reaction's % yield will be

% yield  = (14.8/15.3) X 100 = 96.7% = 97%

This implies that you only obtain 96.7 g of product for every 100 g of product that the reaction may theoretically create.

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Lewis structure is the electron dot representation of the atomic and molecular bonds of the molecules. Trigonal planar is the shape of the formaldehyde.

A trigonal planar shape of the molecule is the arrangement of the central atom attached to the other three atoms making them look triangle-shaped.

The attachment of the carbon to the two hydrogens and one oxygen atom can be given by the VSEPR theory. The number of the electron pair in the molecule is 3 making them \(\rm sp_{2}\) hybridized and hence have a trigonal planar shape.

Therefore, option D.  trigonal planar is the shape.

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Answer: density or

To determine the toughness of a solid you would have to know how much kinetic energy it absorbed before it broke.

Answer:

a. Two smaller, more stable nuclei

Explanation:

Answer:

a

Explanation:

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