How Scandium affects the government

Taking into account the definition of dilution, if chemist must dilute 93.1 mL of 7.79 of uM aqueous mercury (I) chloride solution until the concentration falls to 3.00 uM, the final volume is 0.24175 L.

Dilution is a procedure by which the concentration of a solution is lowered, usually with the addition of a diluent.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

7.79 uM× 93.1 mL= 3 uM× Vf

Solving:

(7.79 uM× 93.1 mL)÷ 3 uM= Vf

241.75 mL= 0.24175 L = Vf (being 1000 mL= 1 L)

In summary, the final volume is 0.24175 L.

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a. -813.4 kJ.  enthalpy of the reaction is -813.4 kJ

One of the characteristics of a thermodynamic system is enthalpy, which is calculated by multiplying the internal energy of the system by the sum of its pressure and volume. The total enthalpy of a system cannot be directly calculated because the internal energy's components are either unknown, hard to access, or unimportant to thermodynamics.The overall reaction can be represented as: [tex]Ca(s) +\frac{ 1}{2}O_2(g) + CO2(g) \rightarrow CaCO_3(s).[/tex]

The reaction enthalpy [tex](\Delta H_{rxn})[/tex]is the result of adding the reaction's separate enthalpies.The enthalpy of each of the individual reactions is given as:

[tex]Ca(s) + \frac{1}{2}0_2(g) \rightarrow Cao(s) \Delta H_{rxn} = -635.1 kJ CaCO_3(s) \rightarrow Cao(s) + CO2(g) \Delta H_{rxn} = 178.3 kJ[/tex]

Therefore, the overall enthalpy change for the reaction is given as:

[tex]\Delta H_{rxn} = \Delta H_{rxn}(Ca(s) +\frac{ 1}{2}0_2(g) \rightarrow Cao(s)) +\Delta H_{rxn} (CaCO_3(s) \rightarrow Cao(s) + CO2(g))[/tex]

[tex]\Delta H_{rxn} = -635.1 kJ + 178.3 kJ \Delta H_{rxn} = -813.4 kJ[/tex]

Therefore,The reaction's enthalpy is -813.4 kJ.

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complete question:Calculate delta Hrxn for Ca(s) + 1/202(g) + CO2(g) => CaCO3(s) given the following set of reactions:  Ca(s) + 1/202(g) => Cao(s) delta Hrxn = -635.1 kJ CaCO3(s) => Cao(s) + CO2(g) delta Hrxn = 178.3 kJ  a. -813.4 kJ  

b. -456.8 kJ

c. 813.4 kJ

d 456.8 kJ

e. None of these is within 5% of the correct answer.

Answer:

6. The light being reflected off changes the color shown

7. The bottom, the sugar looses its positive charge

Explanation:

The formal charge on the Z atom in the [ZO2]-1 ion is +1.

The Lewis dot structure for the [ZO2]-1 molecular ion is:

          O

          |

    Z === O

          |

          O-

1.   Determine the total number of valence electrons in the ion by adding the valence electrons of each atom and the charge of the ion.

2.  Connect the Z atom to each O atom with a single bond, which uses up 2 electrons.

3.  Add the remaining electrons in pairs as lone pairs to each atom until all valence electrons are used up.

4.  Draw the Lewis dot structure.

O

|

Z === O

|

O-

5.  Calculate the formal charge on the Z atom using the formula:

Formal charge = valence electrons - (number of lone pair electrons + 1/2 x number of bonding electrons)

Formal charge = 4 - (2 + 1/2 x 2) = 4 - 3 = +1

Therefore, the formal charge on the Z atom in the [ZO2]-1 ion is +1.

What is valence electron?

A valence electron is an electron in the outer shell associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed.

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Answer:

0.2237 grams of NaOH

Explanation:

To calculate the grams of NaOH dissolved in 23.46 mL of a 0.238 M solution of NaOH, we can use the formula:

mass = molarity x volume x molar mass

where mass is the mass of NaOH dissolved in grams, molarity is the concentration of NaOH in moles per liter, volume is the volume of the solution in liters, and molar mass is the molar mass of NaOH in grams per mole.

First, we need to convert the volume of the solution from milliliters to liters:

volume = 23.46 mL / 1000 mL/L

volume = 0.02346 L

The molar mass of NaOH is 40.00 g/mol.

Now we can plug in the values and solve for mass:

mass = 0.238 M x 0.02346 L x 40.00 g/mol

mass = 0.2237 g

Therefore, there are 0.2237 grams of NaOH dissolved in 23.46 mL of a 0.238 M solution of NaOH.

The correct Lewis structures of the compounds that we have in the question have been shown in the images attached.

A Lewis structure is a diagram that shows the bonding between atoms in a molecule and the arrangement of electrons around the atoms. It is also known as a Lewis dot structure, Lewis dot diagram, or electron dot structure.

Lewis structures are useful in predicting the geometry of molecules and determining the polarity of molecules. They are also helpful in understanding the reactivity of molecules and how they interact with other molecules.

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Answer:

2.16 M

Explanation:

The molarity of the solution is 2.16 M. To calculate the molarity, you need to first determine the number of moles: 29.4 grams of NaCl is equal to 0.737 moles. Then, divide the number of moles, 0.737, by the volume of the solution, which is 250 mL. Multiplying the result by 1000 gives the molarity, which is 2.16 M.

yw

Strong bases like sodium ethoxide (NaOEt) or sodium hydroxide (NaOH) are used to treat 2-bromooctane, which then goes through an elimination process (also known as dehydrohalogenation) to produce various alkenes.

Ethene, propene, butene, and pentene are the first four alkenes.

Alkenes are a group of unsaturated hydrocarbons (i.e., molecules with solely carbon and hydrogen) that include at least one double bond from carbon to carbon. Olefins is a different name for alkenes. Due to the double bond, alkenes are more reactive than alkanes.

Both the hydrocarbons alkene and alkyne are unsaturated.

Whereas two Carbon atoms in Alkyne are joined by a triple bond, two Carbon atoms in Alkene only have a double bond.

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The correct reaction equation is; Sr(OH)2 ----> Sr + 2OH

A correct chemical reaction equation must follow the law of conservation of mass, which states that matter cannot be created or destroyed, only transformed from one form to another. This means that the total number of atoms of each element on the reactant side of the equation must be equal to the total number of atoms of each element on the product side.

To ensure that an equation is correct, you should first check that the chemical formulas of the reactants and products are correct. You can then balance the equation by adjusting the coefficients in front of each chemical formula so that the number of atoms of each element is the same on both sides of the equation.

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The volume of the 0.10 molL⁻¹ NaCl solution which contains 0.1 mole of sodium chloride, NaCl is 1 L

Molarity of a solution is defined by the following formula:

Molarity = mole / volume

Cross multiply

Molarity × volume = Mole

Divide both sides by molarity

Volume = mole / molarity

With the above formula, we can obtain the volume of the solution. Details below:

Volume = mole / molarity

Volume of solution = 0.1 / 0.1

Volume of solution = 1 L

Thus, we can conclude that the volume of the solution is 1 L

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Complete question:

0.10 molL⁻¹ NaCl solution contains 1.0 mole of NaCl​. What is the volume of the solution?

Answer: Cleavage

Explanation:

When a mineral breaks along a weekly bonded plane it is called cleavage

The hydronium ion concentration, [H+] of a solution with a pH of 6.82 is 1.51 × 10-⁷ M.

The hydrogen or hydronium ion concentration of a solution can be calculated from the pH using the following formula;

pH = - log {H+}

[H+] = 10−pH

by exponentiating both sides with base 10, we can "undo" the common logarithm.

{H+} = 10-⁶.⁸²

{H+} = 0.000000151356

[H+] = 1.51 × 10-⁷ M

Therefore, the hydronium ion concentration with a pH of 6.82 is 1.51 × 10-⁷ M.

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Base: Water, b. [tex]HCN[/tex] Acid Base [tex]OH-[/tex] , c. Base: I- Acid:[tex]HgI2[/tex] . Chemical substances known as acids have the ability to donate a proton [tex](H+)[/tex] to a base or another molecule.

Chemical substances known as acids have the ability to donate a proton [tex](H+)[/tex]  to a base or another molecule. They have a sour flavour, have the power to dissolve metals, and can make litmus paper turn red. On the pH scale, where 7 is neutral and lower numbers indicate higher acidity, acids have a pH below 7. Hydrochloric acid, sulfuric acid, and acetic acid are a few typical examples of acids. Acids are essential for many chemical processes, such as digestion, the creation of energy, and the synthesis of numerous significant chemicals. Also, they are employed in a number of sectors, such as industry, food production, and agriculture.

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The enthalpy change can not be measured directly because you have to take into account how much energy was put into the reaction in the first place.

Hope this helps!!! :)

The standard enthalpy of formation of all elements in their standard states are assumed to be zero. It is not possible to determine the enthalpy of formation of calcium carbonate as it is formed from other compounds.

The standard enthalpy of formation of a compound can be defined as the enthalpy change accompanying the formation of one mole of the compound from its constituent elements, all the substances being in their standard states.

The standard enthalpy of formation is usually denoted as ΔfH⁰. For example the enthalpy of formation of CO₂ and CH₄ are -393.5 kJ mol⁻¹ and -74.8 kJ mol⁻¹ respectively.

Here CaCO₃ is formed by the reaction:

CaO + CO₂ → CaCO₃

The enthalpy change for the given reaction is not an enthalpy of formation of CaCO₃. Since CaCO₃ is not formed from its constituent elements.

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Answer:

The correct electron dot diagram for Al is option A:

•Al:

:AI:

Explanation:

The mass (in kilograms) of Cryolite, Na₃AlF₆ produced, given that 10.3 Kg of Al₂O₃, 55.4 Kg of NaOH, and 55.4 Kg of HF react completely is 42.4 Kg

The mass of Na₃AlF₆ produced from the reaction can be obtained as follow:

Al₂O₃(s) + 6NaOH(l) + 12HF(g) ⟶ 2Na₃AlF₆ + 9H₂O(g

From the balanced equation above,

0.102 Kg of Al₂O₃ reacted to produce 0.420 Kg of Na₃AlF₆

Therefore,

10.3 Kg of Al₂O₃ will react to produce = (10.3 × 0.420) / 0.102 = 42.4 Kg of Na₃AlF₆

Thus, from the above calculation, it is evident that the mass of Na₃AlF₆ produced is 42.4 Kg

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To form each of the monochlorination products shown, you will need to draw curved arrows that demonstrate the propagation steps. The first step is when a chlorine radical combines with the double bond to form a chlorine radical cation, which then donates an electron to the double bond.

This results in the formation of two radical chlorides, one on each carbon atom. These radicals then combine with two hydrogen atoms to form the monochlorination product, completing the reaction.The curved arrows for this process should be drawn as follows:

An arrow pointing from the chlorine radical to the double bond, representing the attack of the radical all arrows have been drawn, the monochlorination product has been formed. The mechanism of propagation steps to form each monochlorination product is shown in the following reaction:To represent this reaction, you can draw a curved arrow to show the movement of electrons from the bond to the chlorine. The arrow should start from the carbon-carbon double bond and point towards the chlorine.

Then, another curved arrow can be drawn to represent the formation of the C-Cl bond. The arrow should start from the chlorine and point towards the carbon with the unpaired electron.This process can be repeated to form the second monochlorination product. The following diagram shows the mechanism of the propagation steps:Here, you can see that the curved arrows are used to represent the movement of electrons during the reaction. The arrows point towards the atom that is gaining the electrons.

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Answer:

Using C2H4 + 3 O2 -> 2 CO2 + 2 H2O. If 20 moles of fuel are combusted in the above equation, how many moles of O2 are consumed?

Explanation:

According to the balanced chemical equation:

1 mole of C2H4 reacts with 3 moles of O2

Therefore, for 20 moles of C2H4 combusted, we would need:

20 moles C2H4 × (3 moles O2 / 1 mole C2H4) = 60 moles O2

So, 60 moles of O2 are consumed in the combustion of 20 moles of C2H4.

Answer: The Oxidation State Of Sulphur is +6

Explanation:

The correct electron configuration for Tc (technetium) is [Kr] 5s² 4d⁵. Therefore, the correct answer is: [kr]5s²4d⁵.

Technetium (Tc) is a radioactive chemical substance with the atomic number 43 and symbol Tc. It is a silvery-gray metal that belongs to the transition metals group on the periodic table. Technetium is the first element to be artificially produced, and all of its isotopes are radioactive, with no stable isotopes. It is a highly toxic and dangerous element, and therefore has no significant commercial applications. Technetium has many nuclear and medical applications due to its radioactivity, and is used in medical imaging, cancer treatment, and scientific research.

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Answer:

C

Explanation:

edg 2023

The correct answer is option D, It can affect the AH value.

A phase change is a physical change in a substance in which the substance's state of matter is changed, such as from a gas to a liquid or from a liquid to a solid. It is also known as a phase transition.

Phase changes also involve changes in energy, temperature, and pressure. For example, when a solid melts to become a liquid, it absorbs energy and the temperature rises. When a liquid boils to become a gas, energy is released and the temperature decreases. Similarly, when a gas condenses to become a liquid, energy is released and the pressure increases.

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Answer:

The solution in the test tube would turn pink earlier with the more concentrated NaOH solution.

This is because the concentration of the NaOH solution is directly proportional to the number of moles of NaOH per unit volume of the solution.

So, with a more concentrated NaOH solution (1.0 M compared to 0.5 M), each mL of NaOH solution contains twice as many moles of NaOH.

Therefore, it would take half as much volume (i.e., 12.4 mL instead of 24.8 mL) of the 1.0 M NaOH solution to react with the same number of moles of the unknown acid as the 0.5 M NaOH solution.

All of the groups of substances involve the use of chemicals from the question that we have here.

Chemicals are essential to life and to many industries, including agriculture, medicine, manufacturing, and technology. They can be found in everyday objects such as food, clothing, electronics, and cleaning products.

Chemicals can be classified into various categories based on their properties, chemical structure, and uses. Some common categories of chemicals include:

Elements: Pure substances that cannot be broken down into simpler substances. Examples include carbon, oxygen, and gold.

Compounds: Substances composed of two or more elements chemically bonded together. Examples include water (H2O) and table salt (NaCl).

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Which of the following groups of substances involve the use of chemicals? Indicate all that apply.

Check all that apply.

Which of the following groups of substances involve the use of chemicals? Indicate all that apply.Check all that apply.

A light-weight bicycle frame, food packaging, a car exhaust catalytic converter

Soap, shampoo, washing powder

Antiseptic cream, pain killers, energy drinks

Paints, printer toner, food coloring

Computer displays, LED lights, barcode readers

The molecule that is drawn in a conformation that has a proton and a leaving group anti-periplanar is H₂C, Br.

The A, B, C, and D bond angles of a molecule are referred to as anti-periplanar, or antiperiplanar, in organic chemistry. The dihedral angles of the A–B and C–D bonds in this conformer are larger than +150° or less than 150°. In textbooks, the term "anti-periplanar" is frequently used to refer to a strictly anti-coplanar structure with a 180° AB CD dihedral angle. The anti-periplanar functional groups will be 180° apart from one another and in a staggered configuration in a Newman projection of the molecule.  

Conformation is an essential factor in predicting reactivity in organic molecules. The anti-periplanar conformation of a molecule is one that occurs when two atoms in a molecule are in the same plane and are separated by 180 degrees. In this case, the proton and leaving group are placed in a perpendicular plane to the atoms directly in between them. This is the most stable conformer of the molecule. A significant factor in predicting reactivity in organic molecules is conformation. In this case, the molecule H₂C, Br is drawn in a conformation that has a proton and a leaving group anti-periplanar.

Therefore, the correct option is H₂C, Br.

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Answer:

1.82 atm

Explanation:

Ideal gas law

P=nRT/V

1) solve for n which is moles

7.16 / 4 = 1.79 mole He

2)

n=1.79

R=0.0821

T=692 K

V=55.9

P=1.79 X 0.0821 X 692 / 55.9 =1.82 atm

The formula for Co3+ is Co3+ because it represents the ion of cobalt that has lost three electrons, leaving it with a 3+ charge.

What is chemical formula and how they are formed ?

A chemical formula is a symbolic representation of a chemical compound that shows the types of elements present in the compound and the relative number of atoms of each element. For example, the chemical formula for water is H2O, which indicates that it is made up of two hydrogen atoms and one oxygen atom.

Chemical formulas are formed by identifying the elements that make up a compound and determining the relative number of each element in the compound. The number of each element is represented by a subscript following the chemical symbol of the element. For example, the chemical formula for methane is CH4, which indicates that there is one carbon atom and four hydrogen atoms in each molecule of methane.

The formula for Se2- is Se2- because it represents the ion of selenium that has gained two electrons, giving it a 2- charge.

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The volume ratios from the equation 2H2 + O2 → 2H2O are:

The coefficients in a balanced chemical equation give the ratio of moles of reactants and products. From the equation 2H2 + O2 → 2H2O, we can see that:

Therefore, the following volume ratios are valid:

What are the reactants?

The reactants are the substances that participate in a chemical reaction and are consumed to form new products. In the equation 2H2 + O2 → 2H2O, the reactants are hydrogen gas (H2) and oxygen gas (O2). These reactants undergo a chemical reaction to form water (H2O) as the product.

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Answer:

The compound has 187.5 g. of Carbon

Explanation:

If the 100% of the compound is 250 gr, then you can calculate the 75% of it by multiplying:

Amount of Carbon = (75%) 250 g.

75%= 0.75

250  (0.75)

= 187.5 g.

Answer: Polar

Explanation: This is because if you look up the Lewis Dot structure of this specific molecule, it will have some net dipole moment, which makes it polar.

It can be considered that when a molecule does have some net dipole moment, it is polar.

So, yes CF3Cl is polar.

CF₃Cl, also known as chlorotrifluoromethane, is a polar molecule.

To determine the polarity of a molecule, consider the individual bond polarities and the molecular geometry.

In CF₃Cl, there is a difference in electronegativity between carbon (C) and chlorine (Cl), as well as between carbon and fluorine (F). Chlorine and fluorine are more electronegative than carbon, meaning they have a greater ability to attract electrons toward themselves.

The C-Cl bond and the C-F bonds in CF₃Cl are polar bonds due to the electronegativity difference. The Cl and F atoms pull the shared electrons towards themselves, creating partial negative charges on those atoms and partial positive charges on the carbon atom.

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The formation of the phosphorylated intermediate (an anhydride) involves the formation of a penta-coordinate intermediate. This intermediate is formed by a nucleophilic attack of the sulfur on the phosphorus atom of the phosphate group.

In this mechanism, the sulfur atom of the sulfate group nucleophilically attacks the phosphorus atom of the phosphate group to form a penta-coordinate intermediate. This intermediate then rearranges to form a phosphorylated intermediate, which is an anhydride.

Mechanism showing the penta-coordinate intermediate and the formation of the phosphorylated intermediate are given as follows:

Step 1: Alkyl Phosphate Formation : The first step of the mechanism includes the formation of an alkyl phosphate. A proton is abstracted by OH− from the phosphate group to create the alkyl phosphate. The base catalyzes this step.

Step 2: Binding to Mg2+After the alkyl phosphate is created, the magnesium ion binds to it.

Step 3: Nucleophilic attack: Following that, the nucleophilic attack happens, with the nucleophile being the water molecule. It is coordinated with the magnesium ion. It occurs at phosphorus, causing it to be phosphorylated. It results in the creation of a pentacoordinate intermediate.

Step 4: Release of Orthophosphate: Orthophosphate is released as a result of the reaction between pentacoordinate intermediate and water. It results in the creation of a diester intermediate.

Step 5: Subsequent Hydrolysis: In the final step, the intermediate diester is hydrolyzed to form orthophosphate and the final product. This is accomplished via nucleophilic substitution.

The end result is a free phosphate group that is bound to the alcohol's oxygen. A phosphate anhydride is formed in the process.

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