two of these statement about elements and atoms are true, and one is false. which statements are true​

Absorbance is measured using a spectrophotometer or microplate reader, which is an instrument that shines light of a specified wavelength through a sample and measures the amount of light that the sample absorbs.

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Answer:

as temperature increases, solubility of gas decrease

The volume of water added to dissolve potassium hydrogen phthalate (KHP) does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

In volumetric analysis, the primary objective is to find the exact concentration of an analyte in a given solution. Analyte refers to the substance whose concentration is to be determined.In order to measure the analyte concentration, the known volume of the titrant of known concentration is added to the analyte until the endpoint is reached.Endpoint refers to the point in a titration where the reaction between the analyte and titrant is complete. The endpoint can be detected by observing a physical change in the system.In the case of KHP, it dissolves completely in any volume of water.

Therefore, the mass of KHP used can be accurately measured and dissolved in any volume of water. As a result, the volume of water added to dissolve the KHP does not affect the accuracy of the experiment.In summary, the volume of water added to dissolve KHP does not matter because the mass of KHP used is known and it will dissolve completely in any volume of water.

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Answer:

How many distinct monochlorinated products can result when methylcyclohexane is subjected to free radical chlorination under UV light.

Explanation:

Consider 1-methylcyclohexane:

Its structure is shown below:

It has primary \(1^o\), secondary \(2^o\)and tertiary \(3^o\) carbons as shown in the image.

So, the following mono chlorinated product will be formed.

Answer:

The awnser is cerebral palsy

Explanation:

that is a medical condition caused when there is not enough oxygen to the brain at birth

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Answer:A

Explanation:

The kinetic molecular theory of matter states that: Matter is made up of particles that are constantly moving. All particles have energy, but the energy varies depending on the temperature the sample of matter is in.This is turn determines shearer the substance exists in the solid, liquid, or gaseous state.

Every substance might have its own unique properties. They can be of characteristic physical and chemical properties  by which they can be identified.

Physical properties of a substance include the properties related to its mass, volume, density its phase change etc. Various physical properties include density, conductivity, melting point, boiling point etc.

Chemical properties of a substance include its reactivity, bond type etc. The reactivity of each substance may vary based on their bond type and intermolecular force of attraction. Each substance shows different reactivity  towards air, water, with other metals and chemicals.

Similarly, the state of each substance it mostly exists will be different. Therefore, by determining the physical and chemical properties of the substance, we can identify the substance.

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Answer:

The blue car left paint on the red car

Explanation:

The number of buckets we need to separate these chemicals is 3.

Intermolecular force of the attraction is defined as the attraction by which two atoms or two molecules combine to form a molecule or matter. This force is basically attractive in nature. Intermolecular forces are the forces of attraction or repulsion which acts between neighboring particles. It acts between atom and ions also. The intermolecular force usually varies for solid, liquid and gaseous matter.

Here, C₂H₆ have London dispersion forces

CH₃F have Dipole-Dipole forces

CH₄ have London dispersion forces

NH₃ have hydrogen bonding

Hence, in order to separate these chemicals we need 3 buckets (different kinds of imf).

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The volume now is 182.16 L, by using gas laws.

To solve this problem, we need to use the gas laws, specifically the relationship between volume, number of moles, and gas constant. We can start by using the equation:PV = nRT where P is pressure, V is volume, n is number of moles, R is the gas constant, and T is temperature (which we can assume is constant in this problem).

Since we are given the initial volume (V1) and number of moles (n1), we can solve for the initial pressure (P1):

\(P1 = n_1RT/V_1\)
Next, we are asked to find the final volume (V2), but we only have the number of moles (n2) and the initial pressure (P1). We can use the same equation, but with the new values:
\(P_1V_1 = n_2RT\)

2:
\(V_2 = n_2RT/P1\)
Now we just need to plug in the values:
V2 = (29.9 mol)(0.08206 L·atm/mol·K)(273 K)/(\(n_1RT/V_1)\)
V2 = (29.9 mol)(0.08206 L·atm/mol·K)(273 K)/(12 miles of gas x 1609.34 m/mile x 3.78541 L/gal)
V2 = 95.4 L
Therefore, the volume of the gas at 29.9 moles is 95.4 L.
Initial volume (\(V_1\)) = 72.3 L
Initial moles (\(n_1\)) = 12 miles of gas (assuming you meant "moles" instead of "miles")
Final moles (n2) = 29.9 moles
We can set up a proportion:
\(V_1 / n_1 = V_2 / n_2\)
Now we can plug in the values and solve for \(V_2\):
72.3 L / 12 moles = \(V_2\) / 29.9 moles
Cross-multiply and solve for \(V_2\):
\(V_2\) = (72.3 L * 29.9 moles) / 12 moles
\(V_2\) ≈ 182.16 L
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Answer:

Explanation:

A biography is a specialized form of history. It is an account of events based upon the example of one person's life. There are four basic types of biographies: historical fiction, academic, fictional academic, and the prophetic biography.

Now

\(\\ \rm\Rrightarrow Q=mc\delta T\)

\(\\ \rm\Rrightarrow Q=200(10)(0.21)\)

\(\\ \rm\Rrightarrow Q=20(21)\)

\(\\ \rm\Rrightarrow Q=420cal\)

Answer:

AAAAA its A

Explanation:

Most of the reactions take place in solutions, it's critical to comprehend how the substance's concentration is expressed in a solution. Here the volume in mL of NaOH required to neutralize 334 mg of pure aspirin is 5 L.

The letter M stands for molarity, one of the most often used units of concentration. The number of moles of solute contained in 1 liter of solution is how it is defined.

Molarity is the ratio of the moles of a solvent to the total volume of the solution. The solution contains both the solute and the solvent.

Molarity = Number of moles / Volume of solution in L

1mg = 0.001 g

Here, 334 mg = 0.334 g

Molar mass of aspirin = 180.158 g/mol

Number of Moles = Mass / Molar mass = 0.334 / 180.158 = 0.0018

Volume  = Number of moles / Molarity = 0.0018 / 0.337 = 0.005 L

0.005 L = 5mL

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Answer:

1. place some sulfuric acid in a beaker and warm it in a water bath.

2. add a spatula of copper(II) oxide powder to the acid and stir with a glass rod.

3. continue adding copper(II) oxide powder until it is in excess.

4. filter the mixture to remove the excess copper(II) oxide.

Explanation:

a. For the first  response A B--> 2C, the value of ∆ H2 will be equal in magnitude but  contrary in sign to ∆ H1, because the rear  response.

2C--> A B, is just the original  response reversed. So, ∆ H2 = - ∆ H1.  

b. For the first  response A1/2 B--> C, the value of ∆ H2 will also be equal in magnitude but  contrary in sign to ∆ H1, because the rear  response, C--> A1/2 B, is just the original  response reversed. So, ∆ H2 = - ∆ H1.  

c. For the first  response A--> B 2C, the value of ∆ H2 will be equal in magnitude but  contrary in sign to ∆ H1/ 2, because the rear  response, 1/ 2B C-->1/2 A, is just the original  response reversed and halved. So, ∆ H2 = - ∆ H1/ 2.

For the first  general  response, A B--> 2C and 2C--> A B, the value of ∆ H2 will be equal in magnitude but  contrary in sign to ∆ H1, because the rear  response, 2C--> A B, is just the original  response reversed. So, ∆ H2 = - ∆ H1.   This means that the enthalpy change for the rear  response is equal in magnitude but  contrary in sign to the enthalpy change for the forward  response.  

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According to the given statement It is a heterogeneous mixture can the students conclude about their sample.

If the chemical make-up of a combination remains constant throughout, it is said to be homogeneous. The salt water sample mentioned above is homogeneous due to the evenly distributed salt that has been absorbed across the entire sample. Heterogeneous mixes fall under the two divisions of suspensions and colloids.

The distribution of the particles is not regular in heterogeneous mixtures. With the eye, the heterogeneous combination may be seen. The composition of a heterogeneous mixture is not constant. Pizza, sweaters, and other common mixes are examples of heterogeneous mixtures.

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Answer:

its FALSE

Explanation:

FAKE   ITS NOT REAL

Answer:

c.corn syrup

the egg shrinks due to osmosi.

Answer: aragon is in group 0

2. It’s a non metal

3. Group number

Explanation:

Answer:

ΔH° of the reaction is -747.54kJ

Explanation:

Based on gas law, it is possible to find the ΔH of a reaction using ΔH of half reactions.

Using the reactions:

(1) C(graphite) + 1/2O₂(g) → CO(g) ΔH° = -110.5 kJ

(2) CO(g) + 1/2O₂(g) → CO₂(g) ΔH° = -283.0 kJ

(3) H₂(g) + 1/2O₂(g) → H₂O(l) ΔH° = -285.8 kJ

(4) C(graphite) + 2H₂(g) → CH₄(g) ΔH° = -74.81 kJ

(5) CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) ΔH° = -890.3 kJ

The sum of 4×(4) + (5) gives:

4C(graphite) + 8H₂(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) + 3CH₄(g)

ΔH° = -74.81 kJ ×4 - 890.3 kJ = -1189.54kJ

Now, this reaction - 4×(1) gives:

4CO(g) + 8H₂(g) → CO₂(g) + 2H₂O(l) + 3CH₄(g)

ΔH° = -1189.54kJ - 4×-110.5 = -747.54kJ

Thus ΔH° of the reaction is -747.54kJ

ΔH° of the reaction is for the production of SNG -747.54kJ

According to Hess’ law of constant summation, the standard reaction enthalpy is independent of the pathway or number of the reaction steps taken for a multistep reaction, rather it is the sum of standard enthalpies of intermediate reactions involved at the same temperature.

Based on Hess law, it is possible to find the ΔH of a reaction using ΔH of half reactions.

From the given reactions:

The sum of Reaction 4 × 4 + Reaction 5 - Reaction 1 × 4 gives the reaction below:

4CO(g) + 8H₂(g) → CO₂(g) + 2H₂O(l) + 3CH₄(g)

ΔH° = {-74.81 kJ × 4} - 890.3 kJ {- 4 ×-110.5}

ΔH° = -747.54kJ

Therefore, ΔH° of the reaction is for the production of SNG -747.54kJ

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Answer:

-1

Explanation:

electrons are negative

\(C_{2}\) and \(B_{2}\) molecules show an increase in bond order when one electron is added to the molecule.

When an electron is added to \(C_{2}\) molecule, the bond order increases from  2 to 2.5 as the electron is added into σ\((2Px)\) orbital which is bonding in nature. This leads to stabilization.

\(B_{2}\) has 2 unpaired electrons because of the single occupancy of the degenerate pi orbitals with a bond order one.

Adding one electron to give monoanionic results in pairing one of these electrons leaving one unpaired electron.

The bond order increases to 1.5.

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The number of atomic orbitals is the same for all elements in a period. Every element in the top row (the first period), for example, has only one orbital for its electrons. The electrons of all the elements in the second row (second period) have two orbitals. Every row adds an orbital as you progress down the table.

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Answer:

C.

Explanation:

average of isotopic masses

The atomic mass of an element is determined by the average of the isotopic masses present in nature.

Isotopes are different forms of an element that have the same number of protons in their nucleus, but a different number of neutrons. Each isotope of an element has a unique atomic mass that is determined by the number of protons and neutrons in its nucleus.

In nature, elements are found as a mixture of their isotopes, and the atomic mass of an element is calculated by summing the product of the mass of each isotope and its relative abundance. This weighted average takes into account the fact that some isotopes are more common than others and gives a more accurate representation of the element's atomic mass.

Therefore, the atomic mass of an element is not determined by the average of ions, the average of protons, the average of radioactive particles, or the average of crude weights, but rather by the average of isotopic masses.

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Yes, this is still a transmutation process because a neutron is being absorbed by the Pu-240 nucleus, which results in the formation of Pu-241 nucleus. Although the atomic number of the element remains the same (Pu-94), the mass number changes, making it a transmutation process.

Transmutation is the conversion of one element into another by changing the number of protons in the nucleus. In this reaction, the nucleus of 240Pu absorbs a neutron and becomes 241Pu, which is a different isotope of plutonium.

However, the nucleus of 241Pu is still the same element as 240Pu, as they both have 94 protons in the nucleus. Therefore, even though the element remains the same, a transmutation has still occurred as the number of neutrons in the nucleus has changed.

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The pKa of PhCH2NO2, also known as benzyl nitrite, is approximately 10.5.

This means that at a pH below 10.5, the molecule will exist predominantly in its protonated form (PhCH2NO2H), while at a pH above 10.5, it will exist predominantly in its deprotonated form (PhCH2NO2-).

The pKa value of a molecule is important in determining its acidity or basicity and can affect its reactivity and solubility in different environments.

In the case of benzyl nitrite, its pKa value is relatively low compared to other organic compounds, indicating that it is a moderately acidic molecule.

This information can be useful in understanding the chemical properties and behavior of benzyl nitrite in various applications, such as in organic synthesis or as a pharmaceutical intermediate.

The pKa of PhCH2NO2 (also known as N-Benzyl Nitrobenzene) is a measure of its acidity, which indicates the tendency of the compound to donate a proton in a chemical reaction. pKa is the negative logarithm of the acid dissociation constant (Ka), and lower pKa values correspond to stronger acids.

Unfortunately, I could not find the exact pKa value for PhCH2NO2 in available literature, as pKa values are typically reported for compounds with acidic protons.

However, the structure of PhCH2NO2 consists of a benzyl group (PhCH2-) attached to a nitrobenzene (-NO2) moiety. Nitrobenzene itself has a pKa of around -5, indicating it is not a very strong acid.

Since the benzyl group is electron-donating, it would likely have a negligible effect on the acidity of the nitrobenzene.

In summary, the pKa of PhCH2NO2 is not readily available, but it can be inferred that it is not a strong acid based on the structure and the known pKa of nitrobenzene.

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Answer:

Mass

Explanation:

The formula for density is d = M/V, where d is density, M is mass, and V is volume.

The solute which  provide the sharper end point in a titration with 0.10 M is the question content area , 0.10 M sodium phenolate. Hence option b is correct.

Titration is defined as the assessing how much of one ingredient is needed to react with another to determine how much of that substance is present in a liquid. The titration is used to determine the equivalence point, or the point at which chemically equivalent amounts of the reactants have been mixed.

The base will be firmer and the terminal point will be sharper the lower the value is. Therefore, it is possible to predict which solute will produce a sharper end point by comparing the values of the two solutes that are presented.

Thus, the solute which  provide the sharper end point in a titration with 0.10 M is the question content area , 0.10 M sodium phenolate. Hence option b is correct.

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