what is the oxidation number of cesium in Cs2Cr2O7

Single-solvent recrystallization is a laboratory technique used to purify solid compounds.

The necessary steps are:

Choose the appropriate solvent: It is important to choose a solvent that has a high solubility for the solute at elevated temperatures and a low solubility at room temperature.

Dissolve the solute in the warm solvent: The solute is dissolved in a minimum amount of the chosen solvent and heated until it is fully dissolved.

Performing a filtration: The mixture is then filtered to separate the solute from any impurities or undissolved solids. Gravity filtration or vacuum filtration can be used.

Dry the solute: Finally, the purified solute is dried by evaporating any remaining solvent.

In summary, the necessary steps for a single-solvent recrystallization experiment are choosing the appropriate solvent, dissolving the solute in the warm solvent, performing a filtration, and drying the solute.

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The F is 2.980 x 104 N  gravity Gm1 is  2523 kg m₂ is 5.68 x 1026 kg and radius 54,364 km and height is 108,728 km.

Gravity is the amount of force that is produced by the earth to attract the object toward the surface and it doubles if the mass is double.

The height of Saturn is the duble of the radius of the given radius of 54,364 km of the planet Saturn which is 108,728 km.

Therefore,  F is 2.980 x 104 N  gravity Gm1 is  2523 kg m₂ is 5.68 x 1026 kg and radius 54,364 km and hight is 108,728 km.

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Answer: A model would be useful because the model makes the concepts easier to understand.

Explanation:

Models are helpful tools in science education that can be used to enhance explanations, spark discussion, make predictions, provide visual representations of abstract concepts, and create mental models.

Answer:

The Lewis structure to this question can be described as follows:

Explanation:

Structure of Lewis for  \(S^{2-}\):  

The maximum number of electrons from valence in \(S^{2-}\)  is 8 (6 from S as well as 2 from negative change).  

The valence electrons in the Lewis structure are placed on four sides of the atom.  

Thus the structure of Lewis for \(S^{2-}\) is as follows:

\(\left[\begin{array}{ccc} &. .&\\: &S&:\\&. .&\end{array}\right] ^{2-}\)

Lewis Mg Structure:  

Complete valence electrons are 2 in Mg.  

The Lewis structure for Mg, therefore, is as follows:

\(\ . \\ Mg\\ \ .\)

The Lewis structure for  \(Mg^{2+}\)

The maximum valence of electrons   \(Mg^{2+}\) in is=  0.

Thus, the structure for   \(Mg^{2+}\) is as follows:

 \(Mg^{2+}\)

Lewis structure for P :

The maximum number of valence electrons in P is = 5.

Thus, the structure for P is=

\(\ \ \ . \\ : P \ : \\\)

Answer:

e. C2+

Explanation:

In the molecular orbital theory, the valence electrons in molecules are filled into molecular orbitals in accordance with Hund's rule and Pauli exclusion theory.

The orbitals are filled in order of increasing energy (Aufbau principle) as shown in the question. The bond order refers to half the difference between the number of bonding and antibonding electrons in the molecule.

The smaller the bond order the longer the bond length and vice versa. The specie having the least bond order is C2+ with a bond order of 1.5. This specie certainly has the longest bond length also. Hence the answer.

Applying molecular orbital theory the dicarbon specie that has the longest bond length is ; ( E )  C₂⁺

The valence electrons in molecules fill up molecular orbits in accordance to Pauli exclusion theory  and Hund's  rule.  while

The bond order is the difference between bonding and antibonding electrons found in a molecule divided into half. while the molecule orbitals are filled according to increasing energy in accordance to Aufbau principle

The bond order of a molecule is inversely proportional to the bond length of the molecule. Therefore the dicarbon specie that has the longest bond length is C₂⁺ because it has the shortest bond length of approximately 1.5.

Hence we can conclude that Applying molecular orbital theory the dicarbon specie that has the longest bond length is ; ( E )  C₂⁺

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The volume of the new solution, given that 2.45 L of the initial solution was diluted to 0.80 M is 3.83 L

The following data were obtained from the above question:

Dilution formula states as follow:

M₁V₁ = M₂V₂

Inputting the given parameters, we have:

1.25 × 2.45 = 0.8 × V₂

3.0625 = 0.8 × V₂

Divide both sides by 0.8

V₁ = 3.0625 / 0.8

V₂ = 3.83 L

Thus, we can conclude that the volume of the new solution is 3.83 L

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Orbital notation is a way of representing the electronic configuration of an atom, which describes the arrangement of electrons in its various energy levels or orbitals.

In this notation, each orbital is represented by a box or circle, and the electrons are represented by up or down arrows, which indicate their spin. The number and arrangement of boxes and arrows in the notation follow the rules of the Aufbau principle, the Pauli exclusion principle, and Hund's rule.

The Aufbau principle tells that electrons fill the least energy orbitals before filling higher energy orbitals. The first shell of an atom contains one s orbital, which can hold up to two electrons. The s orbital is represented by a single box or circle, and each electron is represented by an up or down arrow.

The electronic configuration for potassium (K) is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹. In orbital notation, this would be represented as 1s: up arrow, down arrow; 2s: up arrow, down arrow; 2p: up arrow, up arrow, up arrow; 3s: up arrow, down arrow; 3p: up arrow, up arrow, up arrow; 4s: up arrow.

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Answer:

A salt is a neutral ionic compound. Let's see how a neutralization reaction produces both water and a salt, using as an example the reaction between solutions of hydrochloric acid and sodium hydroxide. The overall equation for this reaction is: NaOH + HCI → H2O and NaCl.

Explanation:

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\(\\ \orange{MaggieEve}\)

Answer:

\(d=6.34g/cm^3\)

Explanation:

Hello there!

In this case, since the calculation of density is performed by dividing the mass over volume:

\(d=\frac{m}{V}\)

Which gives us a better understanding of the degree of compactness of the object; we can find the required density in grams per cubic centimeter by applying the following dimensional analysis in the aforementioned equation:

\(d=\frac{0.0124kg}{1893mm^3} *(\frac{10mm}{1cm} )^3*\frac{1000g}{1kg}\\\\d=6.34g/cm^3\)

Regards!

Answer:

edg 2020

Explanation:

Ammonia gas reacts with oxygen gas.

Nitric oxide gas and liquid water are produced.

Platinum is used as a catalyst.

The equation is unbalanced because the number of hydrogen atoms is not the same on both sides of the equation.

Answer:

Ammonia gas reacts with oxygen gas.

Nitric oxide gas and liquid water are produced.

Platinum is used as a catalyst.

The equation is unbalanced because the number of hydrogen atoms is not the same on both sides of the equation.

Explanation:

For edge:)

Answer:

B

Explanation:

Answer:

1. The compound in medicines should be nonpolar because of many reasons.  First off, it is important for any drug to be able to dissolve itself through the cell membrane which consists of a lipid bi-layer, in order perform its function. Non polar compounds are lipid soluble and can dissolve in the lipid layers. Polar compounds are water soluble and cannot cross the cell membrane. Because of this, scientists need to be sure of using compounds that are nonpolar in nature so they are able to pass through the cell membrane and enter into the blood circulation of the body and perform its function.

2. You need to think about the polarity of the dressing in order for it to turn out well because the different ingredients inside the dressing have to be able to dissolve or mix together well or else the consistency will be clumpy or separated. With polarity only, like-polarities dissolve like-polarities. So you must make sure that all your ingredients are polar or all are nonpolar. If you have some ingredients that are polar and some that are nonpolar, the dressing won’t turn out smooth like you want it to.

Explanation:

ap*x

Answer:

GOD BLESS THE GUY ABOVE THANK YOU!!!

Explanation:

Answer:

220.1 grams of CO2.

Answer:

To answer this question, we first need to calculate the number of moles of zinc present in the sample. Since zinc is the second most abundant element, the mass of zinc in a 88.7 gram sample of naval brass is equal to 39.25% of 88.7 grams, or 34.8 g.

Now, we can use the molar mass of zinc (65.38 g/mol) to convert the mass of zinc in the sample into moles:

Moles of Zinc = (34.8 g Zn)/(65.38 g/mol) = 0.532 mol Zn

Therefore, the answer is 0.532 mol Zn, with three significant figures.

Answer: B. Ecosystems

Explanation:

Answer:

............

Explanation:

Explanation:

God loves you you are a good person

Answer:

A hypothesis is a testable statement that is proposed to explain an observation/theory. In this case, one hypothesis that could be used is: Taller people have longer arms than smaller people. You could also say: As the height of an individual increases, the length of their arms also increases.

Independent variables are the variable that is manipulated. In this case, the independent variable is the height of the individual.

Dependent variables are those that change in response to the independent variable. In this case, the dependent variable is arm length.

Answer:

2.25 M

Explanation:

The reaction that takes place is:

First we calculate how many potassium iodide moles reacted, using the given volume and concentration:

Then we convert 45 mmoles of KI into mmoles of Pb(NO₂)₃, using the stoichiometric coefficients of the balanced reaction:

Finally we calculate the molarity of the Pb(NO₂)₃ solution, using the calculated number of moles and given volume:

Answer:

molecules can be much bigger. one molecule of vitamin c is made up of 20 atoms (6 carbons, 8 hydrogens, and 6 oxygens

The density (in g/cm³) of a cube of metal that is 2 inches on a side and weighs 444.5 grams is 3.4 g/cm³ (1st option)

First, we shall obtain the volume of the metal. Details below:

Volume = L³

Volume = 5.08³

Volume = 131.1 cm³

Finally, we shall obtain the density of the metal. Details below:

Density = mass / volume

Density of metal = 444.5 / 131.1

Density of metal = 3.4 g/cm³

Thus, we can conclude from the above calculation that the density of the metal is 3.4 g/cm³ (1st option)

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Complete question:

What is the density (in g/cm³) of a cube of metal that is 2 inches on a side and weighs 444.5 grams?

3.4 g/cm³

8.89 g/cm³

55.56 g/cm³

0.180 g/cm³

Answer:

Z: 495

Z+1: 1313

Z+2: 1402

Z+3: 1681

Z+4: 2081

Explanation:

The attached shows that ionization energy increases up and to the right. If we have five consecutive elements then that means as we increase the atomic number we are moving to the right and therefore increasing ionization energy.

The specific heat of aluminum is  0.92 J/g°C.

Use the principle of conservation of energy.

Q aluminum = -Qwater-calorimeter

(m aluminum)(c aluminum)(ΔT aluminum) = -(m water + m calorimeter)(c water)(ΔT water)

where Q is the heat transferred, m is the mass, c is the specific heat, and ΔT is the change in temperature.

Calculate the heat lost by the aluminum.

Q aluminum = (m aluminum)(c aluminum)(ΔT aluminum)

where ΔT aluminum is the change in temperature of the aluminum when it was heated in boiling water:

ΔT aluminum = 98.7°C - 100°C

= -1.3°C

Q aluminum = (73.5 g)(c aluminum)(-1.3°C)

Q water-calorimeter = -(m water + m calorimeter)(c water)(ΔT water)

where ΔT water is the change in temperature of the water in the calorimeter:

ΔT_water = 28.2°C - 25.4°C

= 2.8°C

Q water-calorimeter = -(1500 g + m calorimeter)(4.18 J/g°C)(2.8°C)

Q water = -(1500 g)(4.18 J/g°C)(2.8°C)

Substitute the values and solve for c aluminum:

(73.5 g)(c aluminum)(-1.3°C) = -(1500 g)(4.18 J/g°C)(2.8°C)

c aluminum = -(1500 g)(4.18 J/g°C)(2.8°C) / (73.5 g)(-1.3°C)

c aluminum = 0.92 J/g°C

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Answer:

simple machine, any of several devices with few or no moving parts that are used to modify motion and the magnitude of a force in order to perform work. They are the simplest mechanisms known that can use leverage (or mechanical advantage) to increase force

Explanation:

A lever has a high efficiency due to the fact that it has low internal resistance. The work it puts out is almost equal to the work it receives, because energy used up by friction is quite small. On the other hand, an a pulley might be relatively inefficient due to a considerably greater amount of internal friction.

Any of a number of devices with fewer or no moving components that are employed to change motion and the strength of a force so order to do work are considered simple machines.

A simple machine is a mechanical system that modifies its motion, location, or magnitude at a moment's notice using few or none parts to carry out the desired purpose.

From that point on, gradually, mankind learnt to build precise machines with few moving parts to complete their necessary work. Any of a number of devices with fewer or no moving components that are employed to change motion and the strength of a force so order to do work are considered simple machines.

Therefore, any of a number of devices with fewer or no moving components that are employed to change motion and the strength of a force so order to do work are considered simple machines.

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From the solution that we have in the question;

The equilibrium constant, denoted as K, is a value that quantitatively represents the ratio of the concentrations of products to reactants at equilibrium in a chemical reaction.

It is a fundamental concept in chemical equilibrium.

The value of the equilibrium constant provides valuable information about the position of equilibrium and the relative concentrations of species involved in a chemical reaction.

Kc = [X] [Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\)

\(0.25(0.5 - x) = (0.1 + x)^2\)

\(0.125 - 0.25x =0.01 + 0.2x + x^2\\ x^2 + 0.45x - 0.115 = 0\)

x = 0.18 M

The equilibrium amount of X and Y=  0.28 M and the equilibrium concentration of XY = 0.32 M

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Based on the answer to the question that we have;

The ratio of the product to reactant concentrations in a chemical reaction at equilibrium is represented quantitatively by the equilibrium constant, abbreviated as K.

It is a cornerstone of the theory of chemical equilibrium.

A chemical reaction's equilibrium position and the relative concentrations of the species involved can both be learned from the equilibrium constant's value.

Kc = [X][Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\\0.25(0.5 - x) = (0.1 +x)^2\\0.125 - 0.25x = 0.01 +0.2x +x^2\\= 0.18 M\)

The equilibrium concentration of;

XY =0.5 - 0.18

=0.32 M

Then the equilibrium amount of

X and Y is

0.1 + 0.18= 0.28 M.

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250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.

w/v = [ mass of solute (g) / volume of solution (mL) ] × 100

5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100

volume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100

volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100

volume of solution (mL) = [ 125 g / 0.05 ] x 100

Answer:

6060 moles

Explanation:

3.65x10^27 atoms *( 1 mol/6.02*10^23 atoms)= 6063 moles ≈ 6060 moles

The conclusion that can be drawn about lupus is that: Lupus can affect almost every system of the body. Option D. is the correct answer.

What is Lupus (SLE)?

This refers to a disease that happens when your body's immune system attacks your own tissues and organs (autoimmune disease).

Lupus (SLE) can affect the following body parts: joints, skin, kidneys, blood cells, brain, heart and lungs.

Symptoms differ from person to person but can include fatigue, joint pain, rash and fever. These can get worse from time to time (flare up) and then improve.

Lupus has no cure. Current treatments are based on improving quality of life by controlling symptoms and minimizing flare-ups. This starts with lifestyle modifications, including sun protection and diet. Also, disease management includes medication such as anti-inflammatories and steroids.

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Answer:

(A) It matches the universal pH indicator and is indicating the proper pH.

Explanation:

Correct on edge 2021

Given the data from the question, the correct statement is:

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

The pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.

The scale ranges from 0 to 14 indicating:

These are devices / equipment used to indicate if a solution is acidic, neutral or basic.

From the question given above, we were told that the universal and the cabbage pH indicator gives the same result.

Therefore, we can conclude that the cabbage indicator is indicating the proper pH (Option A)

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a. Balanced equation for the decomposition of sodium bicarbonate by heating is:

2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(g)

b. To heat the mixture, the student can use a Bunsen burner or a hot plate in a fume hood to prevent the release of any harmful gases. The mixture should be heated until there is no more mass loss. To determine the mass loss, the student can weigh the vial and its contents before and after heating. The difference between the two weights will be the mass loss.

c. The student can know that all the sodium bicarbonate has been decomposed when there is no more mass loss. The heating should be continued until the mass of the vial and its contents remains constant.

d. The mass loss of 2.28 g is due to the decomposition of 1 mol of NaHCO3, which has a molar mass of 84 g/mol. Therefore, the original mixture contained 2.28/84 = 0.027 mol of NaHCO3. The mass of Na2CO3 in the mixture can be calculated as follows:

mass of Na2CO3 = mass of mixture - mass loss = 14.00 g - 2.28 g = 11.72 g

The molar mass of Na2CO3 is 106 g/mol, so the number of moles of Na2CO3 in the mixture is:

moles of Na2CO3 = mass of Na2CO3/molar mass of Na2CO3 = 11.72 g/106 g/mol = 0.111 mol

The percentage of Na2CO3 in the original mixture is:

% Na2CO3 = (moles of Na2CO3/total moles of carbonate) x 100% = (0.111/0.138) x 100% = 80.4%

e. To determine which is the limiting reactant, we need to compare the number of moles of NaHCO3 and Na2CO3 in the mixture. We know that the mixture contained 0.027 mol of NaHCO3 and 0.111 mol of Na2CO3. Since the balanced equation shows that 2 moles of NaHCO3 produce 1 mole of Na2CO3, the number of moles of Na2CO3 that can be produced from 0.027 mol of NaHCO3 is:

moles of Na2CO3 = 0.027 mol NaHCO3 x (1 mol Na2CO3/2 mol NaHCO3) = 0.0135 mol Na2CO3

Since the actual amount of Na2CO3 in the mixture is greater than 0.0135 mol, we can conclude that NaHCO3 is the limiting reactant, and Na2CO3 is in excess.

d.

Mass of NaHCO3 = 2.28 g / 84 g/mol = 0.027 mol NaHCO3

Mass of Na2CO3 = 14.00 g - 2.28 g = 11.72 g

Moles of Na2CO3 = 11.72 g / 106 g/mol = 0.111 mol Na2CO3

Total moles of carbonate = moles of NaHCO3 + moles of Na2CO3 = 0.027 mol + 0.111 mol = 0.138 mol

% Na2CO3 = (moles of Na2CO3 / total moles of carbonate) x 100% = (0.111 mol / 0.138 mol) x 100% = 80.4%

e.

Moles of Na2CO3 that can be produced from 0.027 mol of NaHCO3 = 0.027 mol NaHCO3 x (1 mol Na2CO3 / 2 mol NaHCO3) = 0.0135 mol Na2CO3

Since the actual amount of Na2CO3 in the mixture (0.111 mol) is greater than 0.0135 mol, NaHCO3 is the limiting reactant, and Na2CO3 is in excess.

ChatGPT

Explanation

A) Trigonal planar

B) Trigonal pyramid

C) Tetrahedral

D) Linear

E) Linear

F) Tetrahedral

G) Linear