At 520 nm, if 60% of light transmit through a cuvetteand 40% of light is absorbed by the solution in the cuvette, please calculate transmittance T% and absorbance A.

Answer:

Calcium oxide, commonly known as lime, is a chemical compound with the formula CaO.

The total mass of the products is 853.8 g.

We know that we have to apply the principles of stoichiometry so as to be able to obtain the mass of the mass of the products and then the total mass of the products that is obtained in the reaction.

We have that in the question; 496. 5 grams of lead II nitrate reacts with potassium bromide is such a way that the lead II nitrate would be completely consumed in the reaction. This means that the lead II nitrate is the limiting reactant in the reaction.

Number of moles of the lead II nitrate = 496. 5 grams /331 g/mol

= 1.5 moles

If 1 mole of  lead II nitrate produces 1 mole of lead II bromide

Mass of lead II bromide produced = 1.5 moles * 367 g/mol

= 550.5 g

If 1 mole of lead II nitrate produces 2 moles of potassium nitrate

1.5 moles of lead II nitrate produces  1.5 * 2 /1

= 3 moles of  potassium nitrate

Mass of  potassium nitrate = 3  moles * 101.1

= 303.3 g

Total mass produced = 550.5 g + 303.3 g

= 853.8 g

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The chart used by moseley was more accurate at predicting where new elements would be placed, because Moseley's work chart based the atomic number which is definable property, measurable through experimentation not chemical properties or atomic mass as mendeleev do.

In his periodic table, Mendeleev left some notable gaps, such as the gaps just below aluminum and silicon, which covered elements as yet to be discovered. When these elements were later discovered, the properties of the new elements were found to match Mendeleev's predictions. The main difference between Mendeleev's and Moseley's arrangement of the elements on the periodic table is that Mendeleev arranged the elements in ascending order of atomic weight, whereas Moseley arranged them in ascending order of atomic number. Moseley diagrams were based on the use of atomic numbers rather than chemical properties of the elements. The similarity of products from the same period often caused problems when creating orders. Moseley's work made it possible to change atomic number from an arbitrary choice to a definable property that can be measured through experimentation.

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The pressure inside the flask is 0.976 atm (rounded to the thousandth place).

We can use the Ideal Gas Law, which states:

PV = nRT

where:

P = pressure

V = volume

n = number of moles

R = gas constant

T = temperature

We can rearrange this equation to solve for the pressure:

P = nRT/V

We are given the volume V = 9.5 L, the number of moles n = 0.85 g / 32 g/mol (since O2 has a molar mass of 32 g/mol), and the temperature T = 25.80C = 298.95 K. The gas constant R is 0.08206 L atm / (mol K).

Substituting these values into the equation, we get:

P = (0.85 g / 32 g/mol) * (0.08206 L atm / (mol K)) * (298.95 K) / (9.5 L)

P = 0.976 atm

Therefore, the pressure inside the flask is 0.976 atm (rounded to the thousandth place).

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Answer: A.

Explanation: When light passes through a small hole, it creates an inverted image on the opposite side. In this case, since the arrow is pointing up, the inverted image will appear pointing down on the opposite wall. Furthermore, since the box has a hole on its left side, the inverted image will be shifted towards the left.

The soda in a fridge has more thermal energy than the soda on the kitchen table.

Thermal energy is the total energy possessed by an object due to the motion of its particles. It is directly related to the temperature of the object. When a soda is placed in a fridge, it is exposed to a lower temperature environment. The fridge actively removes heat from the air inside, creating a cooler environment. As a result, the soda's temperature decreases. The decrease in temperature corresponds to a decrease in the average kinetic energy of the soda's particles, which directly affects its thermal energy.

On the other hand, a soda on the kitchen table is exposed to the surrounding room temperature. While the room temperature may vary depending on the location and climate, it is generally higher than the temperature inside a fridge. Consequently, the soda on the kitchen table has a higher temperature, which corresponds to a higher average kinetic energy of its particles and thus a higher thermal energy.

In summary, the soda in a fridge has more thermal energy than the soda on the kitchen table due to the lower temperature environment it is exposed to. The lower temperature corresponds to a decrease in the average kinetic energy of its particles and, consequently, a lower overall thermal energy.

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1) The energy level of the electron

2) The symbol is n

3) The shells correspond to the energy levels

4) The 4th shell has more energy than the 3rd shell

We know that the term quantum number has to do with the position of the electron in the atom. According to the Bohr model of the atom, the electrons that are found in the atom are said to have a specific energy and the electron can move from a lower to a higher energy level by the absorption of energy.

Given the fact that the principal quantum number can also be designated as energy levels or shells, we know that all the electrons that can be found in the atom are said to be classified into certain specific principal quantum levels.

Thus, when we have electrons in an atom, the most basic quantum number is the principal quantum number.

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The equilibrium constant, Kp, for the reaction cannot be determined without knowing the equilibrium pressures of gases B and C in addition to the initial and equilibrium pressure of gas A.



To calculate the value of Kp, which is the equilibrium constant in terms of partial pressures, we need to use the given equilibrium pressures and the stoichiometric coefficients of the balanced equation.The equilibrium constant expression for the reaction is Kp = (P(B) * P(C)^2) / (P(A)^2), where P(A), P(B), and P(C) are the partial pressures of gases A, B, and C, respectively.

Given that the initial pressure of A is PA = 240 mmHg and the equilibrium pressure of A is PA = 55 mmHg, we can substitute these values into the Kp expression.Kp = (P(B) * P(C)^2) / (P(A)^2) = (55 * P(B) * P(C)^2) / (240^2)

To solve for Kp, we need additional information about the equilibrium pressures of B and C. Without that information, we cannot determine the exact value of Kp.

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The net ionic equation for the reaction between aqueous calcium hydroxide (Ca(OH)₂) and hydrochloric acid (HCl) can be written as follows : Ca(OH)₂(aq) + 2HCl(aq) -> CaCl₂(aq) + 2H₂O(l)

The representation of a chemical reaction that focuses on the dissociated ions present in a solution is called an ionic equation. It shows the species involved in the reaction as separate ions rather than as complete compounds and to write ionic equation, you need to identify soluble compounds and their dissociated ions in the given reaction.

So, in this reaction, calcium hydroxide reacts with hydrochloric acid to form calcium chloride (CaCl₂) and water (H₂O).

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The molar mass of the metal is 191.1g/mol.

Solution:

Since the formula for faraday's law of electrolysis is given by

Since m = 0.1427g, I = 144.2mA = 144.2mA *(1A/1000mA) = 0.1442 A= 0.1442C/s, t = 16min39s = 16min*(60s/1min) = 960+39 = 999 second Z = 2e-mol

Now put all values in the above formula

0.1427 g = (0.1442 C*999s*M*1 mole e-*1 mol/96485C*s*2e-mol)

M = (0.1427g*96485*2/0.1442*999*1)

M = 191.1538 g/mol = 191.1g/mol

Therefore the molar mass of metal will be 191.1g/mol.

For chemical elements that do not have isolated molecules such as carbon and metals, the molar mass is instead calculated by dividing by the number of atomic moles. Molar mass is defined as the mass in grams of one mole of a substance. The unit of molar mass is gram/mole, abbreviated g/mol.

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Answer:

Photosynthesis, process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. In so doing, photosynthesis provides the basic energy source for virtually all organisms.

Explanation:

Answer:

the basic elements of environment are lithosphere, hydrosphere, atmosphere and biosphere.

Explanation:

Millikan's oil drop apparatus allowed for the determination of the "charge" property of the electron.

Millikan's "oil drop" apparatus allowed for the determination of the charge of the electron, which is a fundamental property of the electron. The apparatus allowed Millikan to measure the rate at which oil drops, suspended in an electric field, fell or rose due to the interaction of the electric field and the charge of the electron. By carefully measuring these motions and analyzing the electric field strength, Millikan was able to determine the charge of a single electron.
Millikan's original test, or a modified version, as shown below, is called the oil drop test. The closed system with transparent side handles holds two cables together, which have a positive or negative effect when electric current is applied. At the start of the test, the atomizer sprays a fine mist of oil droplets over the top of the chamber. Under the force of gravity and air resistance, some oil drops fall through a small hole in the top metal plate.

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Solubility is a measure of the maximum amount of a substance that can dissolve in a given amount of solvent at a given temperature. It is typically expressed as a percentage, with 0% indicating that the substance is completely insoluble and 100% indicating that the substance is completely soluble.

This is why solubility only goes from 0 to 100. Any value above 100% would indicate that more of the substance is dissolved than is physically possible, and any value below 0% would indicate that less of the substance is dissolved than is physically possible. Therefore, solubility can only be expressed within the range of 0 to 100.

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Answer:

Yes, radioactive decay will change the identity of an atom.

Explanation:

This is because the radioactive decay involves the emission of particles that change the number of protons in the nucleus. The number of protons is what determines the identity of the atom.

Answer:

in most instances, the atom changes its identity to become a new element

Explanation:

For each reaction in Model 2, predict the number of electrons that must be involved in the reaction to make the charges in the reaction balance. Two electrons are required to balance the +2 charge on the reactant's side of the equation.

Reaction balance refers to the balancing of the number of reactant and product species in a chemical reaction, such that the total charge and total mass are conserved. This is achieved by adjusting the stoichiometric coefficients of each species in the chemical equation. In addition to balancing the mass of the species, it is also important to balance the charge in the reaction.

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The hydrophobic groups buried in the center that form in water are called  bilayer membranes

The lipid bilayer (or phospholipid bilayer) may be a thin polar membrane made of two layers of lipid molecules. These membranes are flat sheets that form endless barrier around all cells

The purpose of the bilayer membrane is to separate the cell contents from the outside environment. the surface of the cell is mostly water and the inside of the cell is mostly water

A cell wall is a bilayer because it is made up of 2 layers of lipids. The heads of the lipids are faced towards the opposites sides (the inside and out of doors of a cell) while the tail (the 2 fatty acids) are inside the layer facing each other

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Answer:

Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body

Explanation:

In order to answer the question of how many geometric isomers there are for each species, we first need to know the number of stereoisomers for each species. Stereoisomers are molecules that have the same chemical formula and connectivity but differ in the spatial arrangement of atoms due to the presence of chiral centers or double bonds that do not rotate

.Here are the numbers of stereoisomers for each species:- 2 stereoisomers for 2-chlorobut-2-ene- 2 stereoisomers for 2,3-dibromobut-2-ene- 4 stereoisomers for 2,3-dichloropent-2-ene- 2 stereoisomers for 2-bromo-3-methylpent-2-ene

To determine the number of geometric isomers for each species, we need to look at the molecules that contain double bonds

A geometric isomer is a stereoisomer that differs in the orientation of groups around a double bond. In general, there are two possible geometric isomers for each alkene. The two isomers are cis and trans. If the groups are on the same side of the double bond, it is a cis isomer. If they are on opposite sides, it is a trans-isomer.

Here are the numbers of geometric isomers for each species:- 2 geometric isomers for 2-chlorobut-2-ene- 2 geometric isomers for 2,3-dibromobut-2-ene- 4 geometric isomers for 2,3-dichloropent-2-ene- 2 geometric isomers for 2-bromo-3-methylpent-2-ene

Therefore, there are two geometric isomers for 2-chlorobut-2-ene, 2,3-dibromobut-2-ene, and 2-bromo-3-methylpent-2-ene.

There are four geometric isomers for 2,3-dichloropent-2-ene.

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Answer:

20

Explanation:

calculated saturated solutions

Answer: Silicon the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Silicon go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons.

Hope this helps! :)

Explanation:

whats the question. cause I didn't see it

Answer:

Explanation:

The volume of the inner cylinder = πr^2h

                                             = π*4*18

                                            = 72π

The volume of the big cylinder= πr^2h

                                                  = π*16*18

                                                  = 288π

The volume of the cone= \(\frac{1}{3}\) πr^2h

                                       = 1/3 * π*16*5

                                      = 1/3*80π

The total volume= 1/3*80π - 72π+288π

                           = 1/3*80π+116π

                           = (80+348)π/3

                           = 428π/3

                          = 428 * 3.14/3

                         = 1343.92/3

                         =447.9733cubic inches

the mistake that the student might have done is adding the whole volume of the cylinder without subtracting the volume of the hollow.

Answer:

it is because of the bacteria and different things that go into waters such as ponds, rivers, lakes, seas, oceans, streams, and other body of waters and I should also add the chemicals that go into them as well

Explanation:

The cell reaction that leads to the largest positive cell emf can be determined by combining the half-cell reactions with the highest reduction potentials.In this case, the half-cell reactions with the highest reduction potentials are AuBr4^-(aq) + 3e^- -> Au(s) + 4Br^-(aq) with Ered = -0.858V and IO^-(aq) + H2O(l) + 2e^- -> I^- + 2OH^-(aq) with Ered = +0.49V. By combining these two half-cell reactions, the cell reaction can be written as 4AuBr4^-(aq) + IO^-(aq) + 2H2O(l) -> 4Au(s) + I^- + 8Br^-(aq) + 4OH^-(aq), with the appropriate phases indicated.

The largest positive cell emf is obtained by combining the half-cell reactions with the highest reduction potentials. In this case, the half-cell reaction with the highest reduction potential is IO^-(aq) + H2O(l) + 2e^- -> I^- + 2OH^-(aq) with Ered = +0.49V.

To determine the second half-cell reaction, we look for the reaction that involves a species from the first half-cell reaction and has the highest reduction potential. In this case, the species Br^- from the first half-cell reaction, AuBr4^-(aq) + 3e^- -> Au(s) + 4Br^-(aq), has a reduction potential of -0.858V. However, there is no reaction involving Br^- with a higher reduction potential.

Therefore, the cell reaction that leads to the largest positive cell emf is the combination of the half-cell reactions: 4AuBr4^-(aq) + IO^-(aq) + 2H2O(l) -> 4Au(s) + I^- + 8Br^-(aq) + 4OH^-(aq). The appropriate phases are indicated to complete the chemical equation.

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Answer:

alcohol

Explanation:

Conjugate bases are defined as the molecules or ions that remain after acids donate a proton. Conjugate base strength is determined by the strength of the parent acid. As a result, strong acids generate weak conjugate bases, while weak acids generate strong conjugate bases.

The correct option is b. HClO_4.HClO4 is the strongest acid since it has the highest Ka. Because the conjugate base of HClO4 is ClO4, which is quite stable and can handle negative charges better than the others, it is the strongest conjugate base. HClO4 is the strongest acid among the options provided because it has the highest Ka. The conjugate base of HClO4 is ClO4, which is a very stable base because it can manage the negative charge better than any other options provided.

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The molar solubility of AgCl:

The molar solubility of AgCl in a 0.050 M NaCl solution is 8 x \(10^{-8}\) M \(Ag^{+}\)

What is solubility?

The solubility is the quantity of reagent required to saturate the solution or bring about the dissociation reaction's equilibrium.

Reaction:

The dissociation reaction of AgCl in water is:

\(AgCl\)  ⇄ \(Ag^{+} + Cl^{-}\)

Each mole of AgCl that dissolves in this reaction yields 1 mole of both \(Ag^{+}\) and  \(Cl^{-}\). The concentration of either the Ag or Cl ions would then be equal to the solubility.

Solubility= [\(Ag^{+}\)] = [\(Cl^{-}\)]

Calculation:

in 0.050 M NaCl, the [\(Cl^{-}\)] = 1 x \(10^{-2}\)

ksp = [\(Ag^{+}\)] x [\(Cl^{-}\)]

1.6 x \(10^{-10}\) = [\(Ag{+}\)] x ( 5 x \(10^{-2}\))

[\(Ag^{+}\)] = 5 x \(10^{+2}\) x 1.6 x \(10^{-10}\)

[\(Ag^{+}\)] = 5 x 1.6 x \(10^{-10+2}\)

[\(Ag^{+}\)] = 8 x \(10^{-8}\) M

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