consider the reaction of fe with hcl to form fecl2 and h2. if 3.37 g hcl is reacted with excess fe and 4.20 g of fecl2 is ultimately isolated, what is the percent yield for the reaction?

One method of obtaining these nutrients from the shrub is through the branches of the Dodder plant penetrating the tissues of the shrub. This is an illustration of a partnership in which only one creature benefits.

Tissue is a collection of cells with a common structure and function that work as a single unit. The brain give it shape and help it retain heat and energy. ibrocartilage, epithelial tissue, muscle tissue, and nervous tissue are the four different types of tissues.

Your organism is made up of cells, and tissues are created when groupings of cells carry out similar tasks. Your body consists mostly of four different tissue types: connective, epithelial, muscular, and nervous tissue. Organs are cushioned and joined together by connective tissue. The skin's outer layer is made up of epithelial tissue.

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There are approximately 5.18 x \(10^{25\) grams of lithium in 7.56 x \(10^{23\)atoms of lithium.  

We can use the atomic mass of lithium to find the number of grams of lithium in 7.56 x  \(10^{23\) atoms of lithium. The atomic mass of lithium is 6.94 g/mol, so:

Number of atoms of lithium = 7.56 x  \(10^{23\)

Mass of one atom of lithium = 6.94 g/mol

Number of grams of lithium = Mass of one atom of lithium x Number of atoms of lithium

Number of grams of lithium = 6.94 g/mol x 7.56 x  \(10^{23\)

Number of grams of lithium = 5.18 x  \(10^{25\) grams

Therefore, there are approximately 5.18 x  \(10^{25\) grams of lithium in 7.56 x  \(10^{23\) atoms of lithium.  

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The correct ground state electron configuration for Sr (strontium) is:

d. [Kr]5s^24d^2.

In the electron configuration, [Kr] represents the noble gas krypton, which comes before strontium in the periodic table and accounts for the filled electron shells prior to strontium. The 5s^2 portion indicates that there are two electrons occupying the 5s orbital, which are the valence electrons of strontium.

Following the noble gas notation, we start with the electron configuration of krypton: [Kr] = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6.

To complete the electron configuration for strontium, we add the remaining electrons. The 5s orbital is lower in energy than the 4d orbital, so the 5s electrons are added before the 4d electrons. Thus, we have [Kr]5s^2.

Finally, since strontium has an atomic number of 38, its full electron configuration is: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^2.

This electron configuration accurately represents the distribution of electrons within strontium in its ground state, indicating the specific orbitals and the number of electrons present in each.

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Strontium (Sr)'s precise ground state electron configuration is [Kr]5s2, which is represented by option b in the notation for electron configurations.

The distribution of electrons in the ground state electron configuration of strontium (Sr) depicts the atomic structure of that element.. The electron configuration for a ground state Sr atom is [Kr]5s2. In this configuration, 'Kr' represents a core of electrons identical to that in a krypton atom, and '5s2' indicates two electrons in the 5s subshell. This correct answer aligns with option b [kr]5s2. The core notation [Kr] helps simplify the representation of the electron configuration.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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The Fischer projections of the four aldotetroses, D- glucose, and L‑glucose are shown in the attached figures below.

In chemistry, the Fischer projection can be described as a two-dimensional representation of a 3-D organic molecule by projection. Fischer projections were proposed for carbohydrates and used by chemists, particularly in organic chemistry and biochemistry.

The main aim of Fischer projections is to show the chirality of a molecule and to differentiate between a pair of enantiomers. Some notable uses involve drawing sugars and depicting isomers.

All chemical bonds are represented as horizontal lines or vertical lines. The carbon chain is represented vertically and represented by the center of crossing lines. The orientation of the carbon chain is represented in such a way that the first carbon C₁ is at the top.

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The step in any reaction sequence that determines the rate law for the overall reaction is called the rate-determining step. TRUE.

This step is also known as the slowest step in the reaction sequence. The rate law for the overall reaction is determined by the reactants and the rate-determining step. Therefore, it is important to identify the rate-determining step in order to determine the rate law for the overall reaction.
                                 True, the step in any reaction sequence that determines the rate law for the overall reaction is called the rate-determining step. This step has the slowest rate among all the steps in the reaction sequence and thus governs the overall rate of the reaction.

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car, truck, bike, wheelchair

Note that the experiment described is the Rutherford Scattering Experiment invented by Ernest Rutherford for simulating alpha particle dispersion. See the procedure below.

Students might use the above contraption to simulate alpha particle dispersion by rolling the marble down the moveable slope towards the circular weight placed on the huge sheet of lined paper.

The scattering of alpha particles can be studied by measuring the angle of deflection using a protractor.

The significance of this experiment is that it contributes to our understanding of subatomic particle behavior, notably how alpha particles disperse when they contact with other particles. See a clearer image attached.

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That is true he was known as the hair buyer

Answer:

its true.

i did it on edg 2020

Answer:

Under the earth's surface, rocks melt, metamorphize, and crystalize.

Explanation:

Metamorphic and Igneous rocks are basically dependant on the heat/pressure of the environment under the surface :) Melting, metamorphosing and crystallization all occur under earth's surface.

The specific processes in the rock cycle that occur beneath the Earth surface are :

Under the Earth surface the specific rock cycle processes that leads to the formation of the different types of rocks includes;  Melting, metamorphization and rock crystallization.

Metamorphic rocks are formed from other rocks ( sedimentary and igneous rocks)  due to the change in temperature and this process is metamorphization. while igneous rocks are formed from molten rocks caused by the melting process. Sedimentary rocks are formed by the deposition of sediments from weathering of existing rocks this is the  crystallization process.

Hence the specific process in the rock cycle that occur beneath the Earth's surface are : Melting, metamorphosing and crystallization.

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Answer:

The Correct IUPAC name is H3C - CH (CH3) - CH (C2H5) - (CH2)2 - CH3 Class 11

Explanation:

yes searched np is maybe right i not 100% sure i 50% is it right >:) tell if u got it right >:D

Answer:

4-ethyl-6-methyl-3-heptene

Explanation:

Longest chain is seven long so it is heptane

But there is a double bond, so that becomes heptene

The double bound starts on the third carbon, so it is 3-heptene (this tells us where the double bond is)

Now we just got to do the substituents!

There is a ethyl group of the fourth carbon and then a methyl group on the sixth!

Ergo, 4-ethyl-6-methyl-3-heptene

Approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

To determine the volume of 0.250 M NaOH required to neutralize 30.4 mL of 0.152 M HCl, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between NaOH and HCl:

NaOH + HCl -> NaCl + H2O

From the balanced equation, we can see that the stoichiometric ratio between NaOH and HCl is 1:1. This means that for every mole of NaOH, we require an equal number of moles of HCl to neutralize.

First, let's calculate the number of moles of HCl present in the given volume:

Moles of HCl = concentration of HCl * volume of HCl

= 0.152 M * 30.4 mL

= 4.6208 mmol (millimoles)

Since the stoichiometric ratio is 1:1, the number of moles of NaOH required to neutralize the HCl is also 4.6208 mmol.

Now, let's calculate the volume of 0.250 M NaOH needed to contain 4.6208 mmol:

Volume of NaOH = (moles of NaOH) / (concentration of NaOH)

= 4.6208 mmol / 0.250 M

= 18.4832 mL

Therefore, approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.

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Answer:

Explanation:

c

The chloride ion concentration in a saturated aqueous solution of \(PbCl_2\) is 0.0079 M. The correct answer is [Cl-] = 0.0079 M.

The balanced equation for the dissolution of \(PbCl_2\) in water is:
\(PbCl_2\)(s) ↔ \(Pb_2^+\)(aq) + \(2Cl^-\)(aq)
The Ksp expression for this reaction is:
Ksp = [Pb2+][Cl-]^2
Since \(PbCl_2\) is a sparingly soluble salt, it will dissolve to a limited extent in water, but at equilibrium, the product of the ion concentrations must equal the Ksp value. Therefore, we can set up an ICE table to calculate the chloride ion concentration in a saturated solution:
Initial:       \(PbCl_2\)(s)         0            0              0
Change:     \(PbCl_2\)(s)        -x           +x            +2x
Equilibrium: \(PbCl_2\)(s)      -x           x              2x
Substituting these values into the Ksp expression:
\(Ksp = [Pb_2^+][Cl^-]^2\)
\(6.3*10^{-5} = x(2x)^2\)
\(6.3*10^{-5} = 4x^3\)
x = 0.0079 M
Therefore, the chloride ion concentration in a saturated aqueous solution of \(PbCl_2\) is 0.0079 M. The correct answer is [Cl-] = 0.0079 M.

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Because of the atomic number, the size of an atom shrinks over a time.

The quantity of protons in the atom's nucleus is known as an element's atomic number. An element's atomic number uniquely identifies it and establishes where it belongs in the periodic table. The chemical characteristics of an element, such as its valence electrons and reactivity, are also influenced by its atomic number.

Because the atomic number, or number of protons in the nucleus, rises while the electron shell stays at a constant distance from the nucleus, the size of an atom shrinks as you move over a period. The atomic size is reduced as a result of the stronger attraction between the nucleus and electrons that occurs from the increase in the number of protons in the nucleus. Further strengthening the attraction between the electrons and the nucleus as you move throughout the period is a decrease in the electron shielding effect. Even though there are more electron shells present, this results in a reduction in atomic size.

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The number of dilutions required to reach 2.5% as the final concentration would be 2.

Any dilution in which the concentration is reduced by the same amount in each subsequent stage is referred to as a serial dilution.

In serial dilutions, the original volume divided by the final amount is known as the dilution factor.

\(DF = \frac{V_i}{V_f}\)

Now we are given that we must do 50% serial dilution, which indicates that the concentration must be reduced to half of its starting value after each dilution.

∴ \(DF=\frac{10}{50}\) × \(100\)

DF = 2

This indicates that starting with a 10% concentration, a single dilution would result in a 5% concentration. And again diluting this 5% concentration would result in a 2.5% concentration.

Hence, the number of dilutions required to reach 2.5% as the final concentration would be 2.

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The positively charged nitrogen in the thiazolium ring of TPP (thiamine pyrophosphate) acts as a long-range electron sink.

Thiamine pyrophosphate (TPP) is an important coenzyme involved in several metabolic pathways, including the citric acid cycle and the pentose phosphate pathway. The positively charged nitrogen in the thiazolium ring of TPP acts as a long-range electron sink. It stabilizes the negative charges that develop on adjacent carbonyl groups during reactions, allowing the transfer of electrons over long distances. This is essential for catalytic activity in enzymes that use TPP as a coenzyme. The nitrogen in the thiazolium ring can also form hydrogen bonds with other groups in the enzyme, further stabilizing its position and enhancing its ability to act as an electron sink.

TPP is involved in the decarboxylation of pyruvate to acetyl-CoA, an important step in energy metabolism. During this reaction, the negative charge that develops on the carbonyl group of pyruvate is stabilized by the positively charged nitrogen in TPP, allowing the release of carbon dioxide and the formation of acetyl-CoA. Without TPP, this reaction would not occur efficiently, leading to a buildup of pyruvate and a decrease in ATP production. Overall, the ability of the positively charged nitrogen in TPP to act as a long-range electron sink is critical for the proper functioning of many metabolic pathways in the cell.

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Answer:

A) 4 and 3

Explanation:

You don't count the scientific notations in his problem sine they are only trailing zeros which they don't count as sig figs so look at the original numbers. Remember that zeros after decimal points or in-between natural numbers count with that said 2.020 has 4 sig figs and 5.00 has 3 sig figs

Answer:   Because planets do not have nuclear fusion, they do not produce their own light. Instead, they shine with light reflected from a star. When we see planets in the night sky, such as Venus, the so-called "Evening Star," we're seeing reflected sunlight.

Explanation:

The transition from n = 2 to n = 5 (option 2) or from n = 5 to n = 2 (option 4) will cause the greatest amount of energy to be absorbed.

The energy absorbed by an electron transitioning between different principal energy levels in a hydrogen atom can be calculated using the formula:

\(ΔE = -13.6 eV * (1/n_final^2 - 1/n_initial^2)\)

where ΔE is the energy change, n_final is the final principal energy level, and n_initial is the initial principal energy level.

Let's calculate the energy changes for the given transitions:

n = 2 to n = 4:

\(ΔE = -13.6 eV * (1/4^2 - 1/2^2) = -13.6 eV * (1/16 - 1/4) = -13.6 eV * (1/16 - 4/16) = -13.6 eV * (-3/16) = 2.55 eV\)

n = 2 to n = 5:

\(ΔE = -13.6 eV * (1/5^2 - 1/2^2) = -13.6 eV * (1/25 - 1/4) = -13.6 eV * (4/100 - 25/100) = -13.6 eV * (-21/100) = 2.856 eV\)

n = 4 to n = 2:

\(ΔE = -13.6 eV * (1/2^2 - 1/4^2) = -13.6 eV * (1/4 - 1/16) = -13.6 eV * (4/16 - 1/16) = -13.6 eV * (3/16) = 2.55 eV\)

n = 5 to n = 2:

\(ΔE = -13.6 eV * (1/2^2 - 1/5^2) = -13.6 eV * (1/4 - 1/25) = -13.6 eV * (25/100 - 4/100) = -13.6 eV * (21/100) = 2.856 eV\)

Comparing the energy changes, we find that options 2 and 4 have the same energy change of 2.856 eV, which is greater than the energy changes for options 1 and 3 (2.55 eV).

Therefore, the transition from n = 2 to n = 5 (option 2) or from n = 5 to n = 2 (option 4) will cause the greatest amount of energy to be absorbed.

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Answer:

I could be wrong but I am pretty positive that the correct order is grasses and shrubs to guanacos to pumas.

A lower concentration of a reactant can result in a slower reaction rate.

The concentration of a reactant in a solution can affect the rate at which a reaction proceeds. In this case, the student who used a 1.5 m solution of HNO₃(aq) may have observed a slower reaction rate compared to the other students who used a 15.8 m solution of HNO₃(aq).

The rate of a chemical reaction depends on several factors, including the concentration of reactants, the temperature of the reaction mixture, the surface area of any solids, and the presence of catalysts. The concentration of a reactant is particularly important because it determines the number of reactant particles available to react per unit volume of the solution. If the concentration is low, there will be fewer reactant particles colliding with each other, which can result in a slower reaction rate.

In this case, the student who used a 1.5 m solution of HNO₃(aq) may have had fewer HNO₃ molecules available to react compared to the other students who used a higher concentration of the acid. As a result, the reaction proceeded more slowly.

It's also important to note that the reaction rate may depend on other factors besides the concentration of HNO₃, such as the nature of the other reactants and the conditions under which the experiments were conducted.

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Complete Question:

15) In one student's experiment the reaction proceeded at a much slower rate than it did in the other students' experiments. Which of the following could explain the slower reaction rate? O The student did not perform the experiment in the fume hood. O The student used a 1.5 M solution of HNO3(aq) instead of a 15.8 solution of HNO3(aq). O The student used a 3.00 g sample of the mixture instead of the 2.00 g sample that was used by the other students. In the student's sample the metal pieces were much smaller than those in the other students' samples. O The student heated the reaction mixture as the HNO3(aq) was added.

Answer:

The density of the block is 2.827 grams/ cubic inch

Explanation:

The density of the block can be obtained by dividing the given mass of the block by its volume.

Density = mass / volume

The mass of the block given is 435.5 grams

The volume of the block can be obtained by using the formula:

Volume = Length X breadth X height

Volume = 3.5 X 8 X 5.5 = 154 \(in^3\)

There fore the density will be 435.5 / 154 = 2.827 grams/ cubic inch

The mass of water needed to absorb 456 J is 1.44 g

We'll begin by calculating the change in the temperature of the water.

Initial temperature of water (T₁) = 22.7 °C

Final temperature (T₂) = 98.3 °C

ΔT = T₂ – T₁

ΔT = 98.3 – 22.7

Heat absorbed (Q) = 456 J

Change in temperature (ΔT) = 75.6 °C

Specific heat capacity of water (C) = 4.184 J/gºC

Q = MCΔT

456 = M × 4.184 × 75.6

456 = M × 316.3104

Divide both side by 316.3104

M = 456 / 316.3104

Therefore, the mass of the water is 1.44 g

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Answer:

1. Crush the sugar into powder.

2. Heat the water.

3. Dissolve it by stirring continuously

Explanation:

1. Crushing the sugar into powder increases surface area. So it increases the changes of dissolving

2. Heating the water increases the capacity of water to dissolve sugar.

3. Stirring continuously increases randomness of particles so eases mixing up thus increasing dissolving tendency.

Answer:

D

Explanation:

Hope this helped!

Spectrophotometer measures the amount of light absorbed or reflected by a sample solution.

A spectrophotometer is a device used to measure the amount of light a sample solution absorbs or reflects.

It works by shining a beam of light onto a sample solution and then measuring the intensity of the light that is reflected or absorbed.

The light used is typically in the visible spectrum, such as white light, but may also include ultraviolet or infrared light, depending on the application.

The intensity of the light is usually measured in terms of percent transmission or percent reflectance.

To measure the amount of light absorbed or reflected, the sample is placed into a cuvette, a special container designed to hold samples for spectrophotometry.

The light is then shined through the cuvette and onto a detector, which measures the intensity of the light that passes through the sample.

The detector then produces a numerical reading that is directly proportional to the amount of light absorbed by the sample.

spectrophotometer measures the amount of light absorbed or reflected by a sample solution.

It does this by shining a beam of light through the sample solution and then measuring the intensity of the light that passes through it.

The intensity of the light is measured in terms of percent transmission or percent reflectance, which is then used to calculate the amount of light absorbed or reflected by the sample.

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