Using your previous knowledge of intermolecular forces, explain why Iodine, Paraffin, Sucrose, and Sodium chloride melted in that particular order.

Answer:

1.58L

Explanation:

Given parameters:

Initial volume  = 1.2L

Initial temperature  = 28.5°C  = 28.5 + 273  = 301.5K

Final temperature  = 125°C  = 125 + 273  = 398K

Unknown:

New volume  = ?

Solution:

Volume and temperature relationship is resolved using the Charles's law.

The law states that "the volume of a fixed mass of a gas varies directly as its absolute temperature if the the pressure is constant".

So;

       \(\frac{V1}{T1}\)    = \(\frac{V2}{T2}\)  

V1 is the initial volume

T1 is the initial temperature

V2 is the new volume

T2 is the new temperature

             \(\frac{1.2}{301.5}\)    = \(\frac{V2}{398}\)    

              301.5V2  = 477.6

                       V2  = 1.58L

You think we can answer this question without seeing the cubes you're mentioning?

Answer:

loses, gains

Explanation:

NaCl ------------------------> Na+ + Cl-

(on electrolysis)

Sodium loses an electron whereas Chlorine gains an electron.

Hope it helps.

Answer:

4 yards/second is the answer

Answer:

the answer is 4 yards per second

Explanation:

80 yards in 20 seconds

20+20+20+20=80

there are 4, 20s to make 80

in other words...

80÷4=20

Answer:

D on edge

Explanation:

just took test

The list of elements in order from most conductive to least conductive is; potassium (K), germanium (Ge), selenium (Se).

Conductivity is a property of metals. The more "metallic" an element is, the greater its conductivity.

The most metallic element in the list is Potassium hence it has the highest conductivity (1.4×107 S/m) followed by germanium which is a semiconductor (2000 S/m). Selenium has the least electrical conductivity.

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Answer:

use wire nettings

Explanation:

and cages

The process of spectroscopy determines a substance's physical or chemical identity with as near absolute certainty as existing analytical techniques will permit.

Spectroscopy is the study of the interaction of electromagnetic radiation with matter and is a crucial tool in chemical analysis. By studying the spectrum of a substance (the way it absorbs, emits, or reflects light), spectroscopy can provide information about the composition, structure, and properties of the substance, thereby allowing for its identification with high accuracy.

Spectroscopy is a broad and interdisciplinary field that encompasses many different techniques for studying the interaction of electromagnetic radiation with matter. It plays a crucial role in various areas of science, including physics, chemistry, biology, and materials science. Spectroscopy provides information about the composition, structure, and properties of substances by analyzing the way they interact with light.

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Answer:

C

H3OH(g⇌CO(g)+2H2(g)ΔH=+90.7kJ

The sign of the given value of enthalpy is positive which means the heat is released from the system.

Hence, the reaction is an endothermic reaction.

Explanation:

Answer:

Huh? I guess it's

Explanation:

Answer:

The concentration of I⁻ in the solution is approximately \(9.62 * 10^{(-12)} M\).

Step 1: Calculate Ionic Strength (μ):

Ionic strength is a measure of the concentration of ions in a solution and is calculated using the formula:

μ = ½ * Σ (Ci * zi²)

Where: Ci is the concentration of ion i zi is the charge of ion i

In this case, we have Ag⁺ and I⁻ ions.

Since the \(AgNO_3\)  dissociates into Ag⁺ and NO3⁻ ions.

Given:

Concentration of Ag⁺ (Ci) = 0.0010 M

Charge of Ag⁺ (zi) = +1

μ = ½ * (0.0010 M * 1²) = 0.0005

Step 2: Calculate Activity Coefficients (γ):

The Debye-Hückel equation relates the activity coefficient (γ) to the ionic strength (μ):

log(γ) = -A * z⁺ * z⁻ * √(μ) / (1 + √(μ))

Where:

A is a constant

z⁺ and z⁻ are the charges of the ions

For Ag⁺ and I⁻ ions:

z⁺ (charge of Ag⁺) = +1

z⁻ (charge of I⁻) = -1

Calculating γ for Ag⁺:

log(γ Ag⁺) = -0.509 * 1 * -1 * √(0.0005) / (1 + √(0.0005))

γ Ag⁺ = 0.853

Calculating γ for I⁻:

log(γ I⁻) = -0.509 * -1 * 1 * √(0.0005) / (1 + √(0.0005))

γ I⁻ = 0.853

Step 3: Modify Ksp Expression:

The solubility product expression for AgI is:

Ksp = [Ag⁺] * [I⁻]

Using activity coefficients:

Ksp = γ Ag⁺ * [Ag⁺] * γ I⁻ * [I⁻]

Step 4: Solve for Concentration of I⁻:

Given the Ksp value of AgI: Ksp = \(8.3 * 10^{(-17)\)

Given the concentration of Ag⁺ : [Ag⁺] = 0.0010 M

Solving for [I⁻]:

[I⁻] = Ksp / (γ Ag⁺ * [Ag⁺] * γ I⁻)

[I⁻] = \((8.3 * 10^{(-17)}) / (0.853 * 0.0010 M * 0.853)\)

     = \(9.62 * 10^{(-12)} M\)

So, the concentration is \(9.62 * 10^{(-12)} M\).

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Answer:

"Forensic science is a critical element of the criminal justice system. Forensic scientists examine and analyze evidence from crime scenes and elsewhere to develop objective findings that can assist in the investigation and prosecution of perpetrators of crime or absolve an innocent person from suspicion."

Explanation:

Strictly from: https://www.justice.gov/olp/forensic-science#:~:text=Forensic%20science%20is%20a%20critical,an%20innocent%20person%20from%20suspicion.

Forensic science is any science used to aid in a criminal/legal investigation

Answer:

yes and no, it is possible, but im here and you and be any where in the world.

Explanation:

hope it helps

Answer: Yes, it’s possible if you don’t cry like a baby banana and say ouch !!

Explanation:

You should always assume that glassware and metal objects are hot, while working with a heat source.

Safety precautions you should use when working with a heat source are:

Safety equipment you should have in your laboratory are:

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VSEPR (Valence Shell Electron Pair Repulsion) theory is a theory used to determine the three-dimensional molecular geometry of a molecule based on the arrangement of electron pairs around the central atom.

The expected hybridization, regions of high electron density and bond angle of either central carbon in a molecule can be determined using VSEPR theory.

What is VSEPR theory?

VSEPR (Valence Shell Electron Pair Repulsion) theory is a theory used to determine the three-dimensional molecular geometry of a molecule based on the arrangement of electron pairs around the central atom.

The expected hybridization: The expected hybridization of a central carbon atom in a molecule is SP hybridization because it has two electron groups. Hybridization is the process by which atomic orbitals are combined to form new hybrid orbitals.

The regions of high electron density: The central carbon atom in a molecule would have four regions of high electron density. This is because the molecule has four atoms attached to it, including three hydrogen atoms and one other atom. As a result, the regions of high electron density around the carbon atom would be in a tetrahedral arrangement.

Bond angle: The bond angle in a tetrahedral arrangement is 109.5°. Therefore, the bond angle of either central carbon in a molecule would be 109.5°. In conclusion, the expected hybridization of a central carbon atom in a molecule is SP hybridization because it has two electron groups.

The regions of high electron density around the carbon atom would be in a tetrahedral arrangement since it has four atoms attached to it, including three hydrogen atoms and one other atom. The bond angle of either central carbon in a molecule would be 109.5°. VSEPR (Valence Shell Electron Pair Repulsion) theory is used to determine the three-dimensional molecular geometry of a molecule based on the arrangement of electron pairs around the central atom.

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Answer:

1 ) Electrovalent compounds are formed by the complete transfer of electrons while covalent compounds are formed by sharing of electrons between 2 atoms.

2) Electrovalent compounds are more soluble in polar solvents like water while covalent compounds are more soluble in non-polar solvents like methane.

Answer:

yes the ones u chose are correct.

Explanation:

Answer:

b

Explanation:

The pressure of the argon be if we increase the volume to 500ml is fond to be  0.546atm

The exact pressure can be calculated using the Ideal gas law PV=nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant and T is the temperature in Kelvin.

P1 v1/T1 = P2v2/T2

=> P2 => 2x 100x 373 /273 x500

      => 0.546atm

The pressure of the argon would decrease if the volume is increased while the temperature is held constant. This is because the pressure of a gas is inversely proportional to its volume, as stated by Boyle's Law. As the volume increases, the pressure decreases. If the temperature is also increased, the pressure will decrease even further, as the gas particles will have more energy and will be moving faster, which will cause them to spread out and fill the larger volume. Therefore, if the volume of the argon is increased from 100ml to 500ml and the temperature is also increased from 0C to 100C, we would expect the pressure to decrease significantly.

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argon at a pressure of 2 atm, fills a 100 ml vial at a temperature of 0C. What would the pressure of the argon be if we increase the volume to 500 ml, and the temperature at 100C?

None of the given options is entirely correct.

With paper chromatography, mixtures of substances are separated according to how well they dissolve in a solvent and how well they stick to the paper's fibers.

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Answer:

1) 433 (check screenshot)

2) 7.89

The balanced equation for the dissolution of silver chromate in water is: \(Ag2CrO4(s) ⇌ 2 Ag+(aq) + CrO42-(aq)\) The solubility product expression is: \(Ksp = [Ag+]2[CrO42-]\). Ksp js 1.5 x 10^-5 mol/L. The correct answer is option B

Let x be the molar solubility of \(Ag2CrO4\) in the presence of \(K2CrO4.\)Then, the equilibrium concentrations of Ag+ and \(CrO42-\) are both equal to 2x (since the stoichiometric coefficients are 2 and 1, respectively).

The concentration of \(CrO42- from K2CrO4\)  is 0.0050 M, which can be assumed to be constant as it is much larger than the molar solubility of \(Ag2CrO4.\) Therefore, the equilibrium concentration can be expressed as:

\([CrO42-] = 1.9950 M\). Substituting into the Ksp expression and solving for x:\(Ksp = (2x)2(1.9950)1.1 x 10^-12 = 4x^2x = 1.5 x 10^-5 mol/L\) .Therefore, the molar solubility of \(Ag2CrO4\) in the presence of 0.0050 M \(K2CrO4\) is \(1.5 x 10^-5 mol/L\)  Correct Answer is (B).

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First, we need to make the exponent of 10 the same for both.

So let's transform 6.5500 x 10^5 into some number x 10^3.

For this, we need to move the dot to the right, some places where it gives the number 3. In this case, 2 places.

655.00 x 10^3

now we can sum the numbers

8.6500 x 10^3 + 655.00 x 10^3 = 663.65 x 10^3

now we need to transform this number into scientific notation. For this, must have only one number before the dot(on the left side of the dot). We will move the dot to the left, 2 places:

6.6365 x 10^5

Answer: 6.6365 x 10^5

Answer: solvent

called a solvent to form a solution.

Explanation:

have great day

If the equilibrium constant, Kc, for the following reaction is 1.89 × 10⁻⁶at 506 K, Kc for the reaction: NH3(g) + HCl(g) → NH4Cl(s)is 5.291 × 10⁵.

The given reaction is: NH4Cl(s) → NH3(g) + HCl(g)

To calculate Kc for the reaction: NH3(g) + HCl(g) → NH4Cl(s) we must reverse the given reaction. We must use the relationship: If aA + bB ⇌ cC + dD then Kc = [C]c[D]d/[A]a[B]b where [A], [B], [C], [D] are molar concentrations at equilibrium, while a, b, c, d are the coefficients of the balanced chemical equation. To reverse the given reaction, we must invert the value of the Kc. The equation is: NH4Cl(s) ⇌ NH3(g) + HCl(g)Kc = 1.89 × 10⁻⁶at 506 K

Now, we will invert this equation. Kc(NH3)(HCl) = 1/Kc(NH4Cl)

Now, substituting the values: Kc(NH3)(HCl) = 1/(1.89 × 10⁻⁶)Kc(NH3)(HCl) = 5.291 × 10⁵

Therefore, Kc for the reaction:NH3(g) + HCl(g) → NH4Cl(s)is 5.291 × 10⁵.

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When two magnets are repelling each other, the following are true:

A magnet is a substance or item that generates a magnetic field. This magnetic field is invisible, but it is responsible for a magnet's most remarkable property: a force that attracts or repels other ferromagnetic elements such as iron, steel, nickel, cobalt, and so on.

Magnets are classified into three types: perpetual magnets, temporary magnets, and electromagnets. Permanent magnets produce a magnetic field without requiring any external magnetism or electrical power.

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The theory of spontaneous generation, proposed by Aristotle around 350 BC, suggested that life could arise from non-living matter. This idea was supported by daily observations, such as flour bags left in sheds that would eventually have mice in them, and meat left out that would develop maggots.

The reasoning behind discarding the theory of spontaneous generation instead of modifying it lies in the scientific method and the accumulation of evidence. When a theory is modified, it means that adjustments are made to refine or improve the existing understanding of a concept. In the case of spontaneous generation, however, the evidence provided by the experiments conducted by scientists contradicted the idea that life could arise from non-living matter.

When a theory is discarded, it means that it is no longer considered valid or accurate based on the available evidence. In the case of spontaneous generation, the accumulation of evidence through experimentation disproved the theory and led to its abandonment. The new theories, cell theory and germ theory, were supported by substantial evidence and provided a more accurate understanding of the origins of life.

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Answer:

Explanation:

Applying,

The mineral that is required to be added to the enrichment of bread is iron.

Bread enrichment is a common practice in the bakery industry, particularly for wheat-based bread. It is the procedure of adding nutrients to bread to compensate for the nutrients lost during milling and processing. This guarantees that the bread is nutritious and healthy.

Iron in bread enrichmentIron is required in the enrichment of bread. Iron is a nutrient that is required in small amounts. It is an essential mineral that is responsible for forming hemoglobin, a protein in the red blood cells that transports oxygen around the body.

Iron deficiency can lead to anemia and several other health problems. Since the majority of people do not receive sufficient iron from their diets, enrichment is a good method to guarantee that bread consumers get enough of it.

Thus, the correct answer is iron.

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