A sample in a spectrophotometer gives a percent transmittance of 36. 6 %. What is the absorbance of the sample?

Answer:

B.A Solution with a pH greater than 7

Answer:

A

Explanation:

A "Basic solution" Or a base solution is a solution that has less than a level 7 of pH levels

So the answer would be A

The standard enthalpy of reaction for a system in which increasing the temperature by 15 K reduces the equilibrium constant by half, relative to its value at 310 K is -0.956 kJ/mol.

Given: ΔT = 15 K and ∆K/K = 1/2

Temperature is directly proportional to equilibrium constant K,

So, ∆T/T = ∆K/K

This can be written as ∆K/K = ΔH°/R × (1/T2 − 1/T1)

On solving this equation, we getΔH° = −2.303 × R × ΔK/K × T2T2 = 310 + 15 = 325 K∆K/K = 1/2∆H° = −2.303 × 8.314 J mol−1 K−1 × 1/2 × 325 K∆H° = −955.7 J mol−1= −0.956 kJ/mol

Therefore, the standard enthalpy of reaction for a system in which increasing the temperature by 15 K reduces the equilibrium constant by half, relative to its value at 310 K is -0.956 kJ/mol.

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Answer:

4.92

Explanation:

\( \qquad \quad \large {\pmb{ \frak { \mid {\overline{ \underline{\purple{ \bigstar \: Required \: Answer \: \bigstar}}}}}} \mid}\\\)

We are given –

Mass of \( \bf N_2O\) is 216.6 g and we are asked to find number of moles present in 216. 6 g of \( \bf N_2O\)

\(\qquad\)\( \pink{\bf\longrightarrow { Molar \:mass \:of \: N_2O:-} }\)

\(\qquad\)\( \bf \twoheadrightarrow 14\times 2+ 16 \)

\(\qquad\)\( \bf \twoheadrightarrow 44\)

\(\qquad\)____________________

Calculating the number of moles present in 216.6 g of \( \bf N_2O\)

\(\qquad\)\( \purple{\sf\longrightarrow { No \:of \:moles = \dfrac{Given \:mass}{Molar\: mass}}}\)

\(\qquad\)\( \bf \twoheadrightarrow \dfrac{216.6}{44}\)

\(\qquad\)\( \bf \twoheadrightarrow \cancel{\dfrac{216.6}{44}}\)

\(\qquad\)\( \bf \twoheadrightarrow 4.9\: moles\)

__________________________________

The crucible heated before the hydrate was added is to remove the moisture.

What is crucible and its uses?

Crucible is a type of container that is used to heat substances to very high temperatures. It is typically made of a heat-resistant material such as porcelain, metal, or graphite. It is used in a variety of laboratory and industrial processes such as metal smelting, distillation, and synthesis. Crucibles are often used to separate components of a sample by melting them away from the sample and then cooling the remained material for further analysis.

Heating the crucible before adding the hydrate serves two purposes. First, it ensures that any residual moisture in the crucible is removed.  Second, heating the crucible helps to ensure that the hydrate is completely dehydrated.  The crucible is typically heated before adding a hydrate because hydrates are compounds that contain water molecules, which can be chemically bound to the other components of the compound. When the hydrate is heated, the water molecules can be driven off through a process called dehydration, leaving behind the anhydrous compound.

Therefore, in order to remove the moisture the is crucible heated.

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Answer:

yes

hope this helps!!!!

2.56 moles of HCl are required to react with 0.64 moles of KMnO4.

The balanced chemical equation is given as;2KMnO4 + 8HCl → 3Cl2 + 2MnO2 + 4H2O + 2KCl.This equation is balanced in such a way that 2 moles of KMnO4 reacts with 8 moles of HCl to produce 3 moles of Cl2, 2 moles of MnO2, 4 moles of H2O and 2 moles of KCl.We are given the number of moles of KMnO4 as 0.64 moles.Now, we can use stoichiometry to find the number of moles of HCl required to react with 0.64 moles of KMnO4.The balanced chemical equation shows that 8 moles of HCl reacts with 2 moles of KMnO4.

So, one mole of KMnO4 would react with 8/2 = 4 moles of HCl.Now, the number of moles of HCl required to react with 0.64 moles of KMnO4 would be;Moles of HCl = Moles of KMnO4 x (Moles of HCl / Moles of KMnO4) Moles of HCl = 0.64 x 4 = 2.56 moles of HCl.

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Answer - True

Hope this helps :')

Mole is a unit of measurement used to measure the amount of a chemical substance, with 1 mole containing 6.022 x 1023 atoms, or 1.204 x 1024 atoms.

A mole is a unit of measurement in chemistry that is used to determine the quantity of a chemical. It is described as the quantity of a material containing the same number of particles (atoms, molecules, ions, and so on) as there are atoms in 12 grammes of carbon-12.

2 moles of Ca have 2 x 6.022 x 1023 atoms. This is due to the fact that the mole (mol) is a unit of measurement used to determine the quantity of a chemical compound. 1 mol of a material corresponds to 6.022 x 1023 atoms of that substance. As a result, 2 moles of Ca contain 2 x 6.022 x 1023 atoms, or 1.204 x 1024 atoms.

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Answer:selenium

Explanation:

Answer: Nether

Explanation: Because if you have one pound of Calcium and one pound of selenium there both the same weight  

The minimum temperature that air must be chilled to in order to reach saturation at or below 0°C (32°F).

The dew point is the temperature that must be reached while maintaining pressure for the air to become saturated, or for the relative humidity to reach 100%.

Simply said, the boiling point is also known as the saturation temperature. The term "saturation" refers to the temperature that a liquid must reach in order to boil and transition into the vapour phase based on its saturation pressure.

Intensity and chroma are other names for saturation. It speaks to the color's predominant hue. The "pure" hues are found at the outermost portion of the hue wheel. The hue we are using to describe the colour predominates less and less as you travel towards the centre of the wheel.

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To find the number of moles represented by a certain number of particles, you can use Avogadro's number and the concept of molar mass.

Avogadro's number (symbolized as N_A) is a fundamental constant that represents the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. It is approximately equal to 6.022 × 10²³ particles/mole.

Molar mass is the mass of one mole of a substance and is expressed in grams/mole. It represents the sum of the atomic masses or molecular masses of the constituent particles in a substance.

To calculate the number of moles, you can follow these steps;

Determine the number of particles you have (atoms, molecules, ions, etc.).

Identify the molar mass of the substance or the average molar mass if it's a mixture.

Divide the number of particles by Avogadro's number to convert them into moles. The formula is:

Moles = Number of Particles / Avogadro's number

Moles = Number of Particles / (6.022 ×10²³ particles/mole)

The result will give you the number of moles represented by the given number of particles.

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--The given question is incorrect, the correct question is

"Explain how you would find the number of moles that are represented by a certain number of representative particles."--

Answer:

Borax bead test

Explanation:

Another test that can be used to identify colored ions in a specific compound such as salt is called "Borax bead test".

This test involves use of a clear glassy bead of borax that is joined together in a wire loop which is going to be involved in chemical reaction with the salts of certain metals.

This reaction will produce colors that we can use to identify the exact metal ions that are present.

I think the answer is A. I know it's Planet X.

A. Calculation of pH of the solution:KF is a strong electrolyte. Solubility of MgF₂ in the 0.150 M KF solution is 2.64 × 10⁻⁴ M.

When dissolved in water, it ionizes completely to produce one potassium ion (K⁺) and one fluoride ion (F⁻).

So, the concentration of F⁻ ions is equal to the concentration of KF. Here, KF is acting as a source of F⁻ ions. Its ionization in water is given below:

KF (aq) → K⁺ (aq) + F⁻ (aq)

Thus, [F⁻] = 0.150 M

The hydrolysis reaction of fluoride ions isF⁻ (aq) + H₂O (l) ⇌ HF (aq) + OH⁻ (aq)

Initial Conc. 0.150 0 0Eqbm Conc. -x +x +x

Kb = Kw/Ka = 1.76 × 10⁻¹⁴ / 6.8 × 10⁻⁴

= 2.59 × 10⁻¹¹

Kb = [HF] [OH⁻] / [F⁻]x² / (0.150 - x)

= 2.59 × 10⁻¹¹

Now, as the concentration of F⁻ ions is much greater than 1 × 10⁻⁷ M, we can neglect the small amount of x from 0.150 M.

So, the final concentration of F⁻ ions is 0.150 M.x² / 0.150 = 2.59 × 10⁻¹¹

∴ x = 2.56 × 10⁻⁶ M

So, [HF] = [OH⁻] = 2.56 × 10⁻⁶ M

Now, pOH = -log[OH⁻] = -log(2.56 × 10⁻⁶)

= 5.59pH = 14 - pOH

= 14 - 5.59 = 8.41

The pH of the solution is 8.41.

B. Calculation of solubility of MgF2 in the 0.150 M KF solution:

Magnesium fluoride (MgF₂) is an insoluble salt.

Its solubility product is given by the expression

Ksp = [Mg²⁺][F⁻]²At 25°C,

the value of Ksp is 7.4 × 10⁻¹⁰.MgF₂(s) ⇌ Mg²⁺(aq) + 2F⁻(aq)

Now, the concentration of F⁻ ions is 0.150 M and that of Mg²⁺ is unknown.

Let the concentration of Mg²⁺ be x M.So, the equilibrium concentration of F⁻ ions will be 2x M.

Now, the solubility product expression can be written as 7.4 × 10⁻¹⁰ = x(2x)²

= 4x³

∴ x = (7.4 × 10⁻¹⁰ / 4)¹/³

= 2.64 × 10⁻⁴ M

Solubility of MgF₂ in the 0.150 M KF solution is 2.64 × 10⁻⁴ M.

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Answer:

what? that's 66 total, 6 more elliptical machines, a 1 to 1.2 ratio

but I don't know what else you would mean

Answer:

5:6

Explanation:

Hope You Enjoy !

To find the temperature at which the energy estimated from the equipartition theorem is within 2% of the energy given by the Bose-Einstein distribution function, we need to set these two energies equal to each other and solve for the temperature.

The equipartition theorem states that each degree of freedom in a system has an average energy of 1/2 kT, where k is the Boltzmann constant and T is the temperature. For a molecule with three degrees of freedom, the average energy is 3/2 kT.

(€ )=hcũ (eBhci – 1)

Setting 3/2 kT = € with a factor of 0.02, we get:

0.02 hc/ln(1 + hc/€) = kT

Substituting the value of €, we get:

0.02 hc/ln(1 + hc/(3/2 kT)) = kT

This is the equation that gives the temperature at which the two energies are within 2% of each other.

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Answer:

44 neutrons

Explanation:

To find the neutrons of an atom subtract the atomic number from the mass of the atom

in this case

80-36=44

tge number of neutrons that are in that atom is 48

The statement, "During fermentation, sugars are converted into ethanol and carbon dioxide by yeast through the process of anaerobic respiration" is true.

The given statement is true because during fermentation, sugars such as glucose or sucrose are broken down by yeast in the absence of oxygen. This process is a form of anaerobic respiration, where yeast converts the sugars into ethanol (alcohol) and carbon dioxide.

Yeast, a type of microorganism, carries out fermentation as a way to produce energy without the need for oxygen. The process begins when yeast cells take in sugars from their environment. Enzymes within the yeast cells then break down the sugars into smaller molecules, such as pyruvate, through a series of chemical reactions.

In the absence of oxygen, yeast undergoes a metabolic pathway known as fermentation. In alcoholic fermentation, one type of fermentation carried out by yeast, the pyruvate molecules are further converted into ethanol and carbon dioxide. This conversion is facilitated by specific enzymes produced by the yeast.

The ethanol produced during fermentation is responsible for the alcoholic content in various beverages, such as beer, wine, and spirits. The carbon dioxide gas produced is released as a byproduct, creating bubbles in fermented beverages and contributing to the characteristic texture and flavor.

Overall, during fermentation, yeast metabolizes sugars and converts them into ethanol and carbon dioxide. This process is utilized in various industries, including brewing, winemaking, and baking, to produce a wide range of products.

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Answer

The answer is 480g

Suppose 2.32 g of butane is mixed with 14 g of oxygen. The maximum mass of water vapour that could be produced by the chemical reaction is 3.6 g.

Given the equation is gaseous butane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water that can be written as:

\(C_4H_{10\) + 6.5 \(O_2\) ------> 5 \(H_2O\) + 4 \(CO_2\)

Thus, one mole of butane requires 6.5 moles of oxygen

In the question, the molar mass of butane is 58 g thus the number of moles is 0.04. Similarly, the molar mass of oxygen is 32 g and thus the number of moles is 0.4375.

0.04 moles of butane requires 0.04 * 6.5 = 0.26 moles of oxygen thus the butane is the limiting reagent.

1 mole of butane produces 5 moles of water

0.04 moles of butane produces 5 * 0.04 = 0.20 moles of water

Weight of water produces = 0.2 * 18 = 3.6 g.

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Any physical matter that is obtained or made from plants, animals, or the ground without undergoing a chemical process is called a natural material. This is a true statement.

Natural materials are the physical matters that are made from plants, animals and ground(environment) which has not been subjected to any chemical processes for modification.

But any natural material that has undergone any chemical process which has been designed and manufactured to fulfil a particular purpose is called a synthetic material.

Therefore, any physical matter that is obtained or made from plants, animals, or the ground without undergoing a chemical process is called a natural material.

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Q is the heat transferred, m is the mass, C is the specific

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Since we are given the pressure and temperature of the system, we need to find the volume and number of moles of gas.

First, we can find the number of moles of hydrogen that dissociates from the H₂ gas. If the mole fraction of H is 5%, then the mole fraction of H₂ is 95%. Let's assume we start with 1 mole of H₂ . Then, we have:

0.05 moles of H

0.95 moles of H2

Some of the H₂ gas dissociates to H, so let's say x moles of H₂ dissociate. Then, we have:

(0.05 + x) moles of H

(0.95 - x) moles of H₂

Since we are assuming that the only final product is H₂, we know that all of the H atoms will recombine to form H₂:

(0.05 + x - 2x) moles of H₂

(0.95 - x) moles of H2

Simplifying this, we get:

(0.05 - x) moles of H₂

(0.95 - x) moles of H₂

Since we started with 1 mole of H₂, we know that the total number of moles is:

(0.05 - x) + (0.95 - x) = 1 - 2x

Now, we can use the ideal gas law to find the volume of gas at the final pressure and temperature. Since we know the number of moles of gas and the temperature, we just need to find the volume. We can rearrange the ideal gas law to get:

V = (nRT)/P

At 298 K and 1 atm, the gas constant R is 0.08206 L·atm/(mol·K). So, for the initial conditions, we have:

V_initial = (1 mol * 0.08206 L·atm/(mol·K) * 298 K) / 1 atm = 24.4658 L

Now, we can use the mole fractions and the number of moles to find the final volume of gas. We have:

(0.05 - x) moles of H₂

(0.95 - x) moles of H₂

The total number of moles is 1 - 2x, so we have:

(0.05 - x)/(1 - 2x) moles of H₂

(0.95 - x)/(1 - 2x) moles of H₂

Using the ideal gas law again, we can find the final volume:

V final = [(0.05 - x)/(1 - 2x) + (0.95 - x)/(1 - 2x)] * (0.08206 L·atm/(mol·K) * T) / 1.1 atm

Simplifying this, we get:

V final = [1 - 2x] * (0.08206 L·atm/(mol·K) * T) / (1.1 atm)

Now, we need to use the fact that the specific heat is constant to find the final temperature. We can use the formula:

Q = mCΔT

where Q is the heat transferred, m is the mass, C is the specific

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Answer:

As what the person above me said bottom of the cup

Explanation:

Answer:

Explanation:

Those are the answers in order, BUT the Goldstein and Rutherford ones are confusing me because Rutherford discovered protons and the nuclear atom. Through my research I also noticed that Goldstein contributed to the discovery of the protons made Rutherford, so I listed him as the one who discovered the proton.

I hope this helps! Have a wonderful night! :D

Answer:

The Dehydrohaogenation of 1-bromo propane with alcoholic KOH gives propene which on again hydrohalogenation with HBr gives 2-bromo propane due to Markonikove's rule for addition.

Explanation:

The number of ionic bond in copper is zero.

Pure copper or any pure metal for that matter are examples of metallic bonds, which are neither ionic nor covalent. The copper atoms are stacked very tightly in a solid lattice. In fact it has a face centered cubic lattice which is the closed packing of atoms possible. Each atom has twelve nearest neighbors which allows their 4s orbitals (mostly) to have the optimal overlap. All of these orbitals therefore combine in one gigantic band of delocalized orbitals that spans the entire crystal with its myriad atoms. This band is only partly filled and the difference in energy between one state and the next is puny, which explains copper’s outstanding conductive properties.

Therefore, the bonding in copper has a metallic character.

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Answer:

Ba(ClO3)2

Explanation:

Ba(ClO\(_3\))\(_2\) is the correct chemical formula for barium chlorate. These can only include one typographic line containing symbols.

A chemical formula is a way to describe the chemical ratios of the atoms that make up a specific chemical compound or molecule in chemistry. Chemical element numbers, symbols, and on occasion other symbols, including parentheses, dashes, brackets, commas, and plus (+) and minus () signs, are used to represent the chemical elements. Which may also include subscripts or superscripts. Since a chemical formula inherently wordless, it cannot be considered a chemical name. A chemical formula does not equal a complete chemical structural formula, despite the fact that it may suggest certain basic chemical structures. Ba(ClO\(_3\))\(_2\) is the correct chemical formula for barium chlorate.

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