when electrolyzing deionized water, a chemist adds na2so4 to water to facilitate its electrolysis
what is the purpose of Na2SO4

Answer

To answer this question we need to use the following equation

P1/T1 = P2/T2

We can rearrange to make T1 subject of the formula as shown

T1 = (P1 x T2)/ P2

= (3.40 x 340)/ 5.90

= 195.9 K

Small molecules make up water. There are three of them: two hydrogen atoms and one oxygen atom. Hydrogen bonding is a force that holds water molecules together. It is the cause of water's extraordinary abilities.

Our bodies require water for the following reasons:

1. It soothes joints:  In the spine's disks and in joints, cartilage contains about 80% water. Over time, dehydration can reduce the joints' ability to absorb damage, which can result in joint pain.

2.It produces mucous and saliva: Saliva helps in digestion and keeps the eyes, nose, and lips moist. Wear and tear are prevented in this way. Furthermore, drinking water maintains the mouth healthy. When substituted for sweetened beverages, it can also stop tooth decay.

3. It delivers oxygen throughout the body: Blood transports oxygen to various parts of the body and contains more than 90% water.

4. It protects delicate areas of the spinal cord and brain with padding: Brain anatomy and function can be impacted by dehydration. Additionally, it contributes to the synthesis of neurotransmitters and hormones. Long-term dehydration can cause issues with reasoning and thinking.

5. It controls the body's temperature: Perspiration is the result of the middle-layers of the skin's stored water being released when the body becomes hot. Evaporation causes the body to cool. in a sport. Some scientists claim that: Source of reality When the body doesn't have enough water, it can't handle heat stress as well, and it stores more heat. Lots of water consumption may help to reduce physical stress if heat stress occurs when exercising. Yet additional research is needed to fully understand these effects.

6. Water is necessary for the digestive system: The bowel need water to operate properly. Dehydration can lead to constipation, excessive stomach acid, and digestive problems. The likelihood of stomach ulcers and heartburn has increased as a result.

7. It keeps blood pressure stable: Lack of water can cause blood to become thicker. Enough water may reduce the likelihood of vasopressin release, which reduces the risk of high blood pressure, by keeping our cells and organs hydrated.

8. Water prevents kidney damage: The kidneys are in charge of body fluid. Water deficiency may result in kidney stones and other problems. Water is required by the bowel for proper operation. Dehydration can cause digestive problems such as constipation, excessive stomach acid, and more. As a result, it is now more probable to have heartburn and stomach ulcers.

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Answer:

A

Explanation:

Answer:

I don’t think that A is the correct answer, I believe that C may be the correct answer

Explanation:

The number of H atoms in 3(NH₄)₂CrO₄ = 24

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

(empirical formula) n = molecular formula  

Subscripts in the chemical formula indicate the number of atoms

The compound of 3(NH₄)₂CrO₄ ( 3 molecules of (NH₄)₂CrO₄ ) :

Number of H :

\(\tt 4\times 2(subscript)\times 3(coefficient,number~of~molecules)=24~atoms\)

The number of Hydrogen (H) atoms in the compound, 3(NH₄)₂CrO₄ is 1.44×10²⁵ atoms

From Avogadro's hypothesis,

1 mole of H = 6.02×10²³ atoms

Therefore,

24 moles of H = 24 × 6.02×10²³

24 moles of H = 1.44×10²⁵ atoms

Thus, the number of atoms of H in 3(NH₄)₂CrO₄ is 1.44×10²⁵ atoms

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Answer:

Hydrogen

Explanation:

This may be wrong but I can't really tell because of how you have written the question

Answer: The answer is D. Hydrogen

Explanation:

I took the test

Explanation:

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'」*とまっぉのもヴぉこぉぞぽ、こ、

Answer:

Ca(OH)2 + 2NH4Cl .................. CaCl2 + 2NH3 + 2H2O

A gas that initially had a temperature of 422 K and was reduced to only 269 mL would now have an initial temperature of 563.19 K.

Volume at start: 359 mL

Volume completed: 269 mL

422 K is the final temperature.

Temperature at the start =?

Charle's Law can be used to resolve the issue. Charles Law states that with constant pressure and molecular number, the volume of a given amount of a gas is directly proportional to its temperature.

V₁/T₁ = V₂/T₂

Initial volume: V1

Initial temperature is T1.

Final volume is V2.

T2 = Actual temperature.

We will now enter the values into the formula.

V₁/T₁ = V₂/T₂

T₁ = V₁T₂ / V₂

T1 = 359 ml 269 ml / 422 K

T1=151498 ml.K/ 269 ml

T₁ = 563.19 K

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Answer:

It's Insulators

For proof you can search on the internet

The mass in grams of 0.700 moles of water (H₂O) = 12.6g/mol (option C)

The mass of a chemical in a mole is known as its molar mass.

It is the total atomic mass of every element that is present in that molecule. The molar mass unit is g/mol.

Determine the molar mass of the water(H₂O):

Molar masses of 1 g/mol of hydrogen and 16 g/mol of oxygen make up a mole.

The chemical formula for water is H₂O.

The water's molar mass is thus:

H₂O = (2 x 1) + 16

= 18 g/mol

Moles of water = 0.700

The molar water (H₂O) mass = 18 g/mol

Object's mass is determined by:

m = (moles of the sample) x (molar mass of the compound)

So, mass of the water (H₂O):

= (0.700) x (18)

= 12.6 g/mol

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Answer:

sorry we don't know the answer.

Answer:

A.) Linear

Explanation:

The geometry of the molecular oxygen (O₂) is linear. Thus, option (A) is correct.

Valence shell electron-pair repulsion theory (VSEPR theory) is used to predict the molecular structure, and bond angles around a central atom of a molecule by using the number of bonds and lone electron pairs in Lewis structure.

The VSEPR model considers that electron pairs present in the valence shell of a central atom have an arrangement so that repulsions between these electron pairs will be minimized by maximizing the distance between them.

The valence electrons of a central atom form either bonding pairs or lone pairs. The electrostatic repulsion of these electrons is minimized when several regions of high electron density maximum possible distance.

The oxygen molecule has linear geometry with a bond angle of 180°. Each oxygen in oxygen molecule has two lone pairs of electrons on it.

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The law of conservation of the mass is useful for the chemical changes as  if the substance undergoes the chemical change, the product will  have the same mass though it.

The law of conservation of the mass states that the mass is neither created nor be destroyed, it can be only  transformed. The mass of the product  formed  is exactly equal to the mass of the reactants. If the original substance will undergoes the chemical change, the product formed will  have the equal mass of the reactant though it can  be present  in the another form.

Thus, the law of the conservation of mass is related to the chemical change as the mass neither be created nor be destroyed.

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GIVEN :

• Volume ,(V1)= 100ml

• Concentration ,(C1) = 2.50 M

• Concentration ,(C2) = 0.75 M

• Volume ,(V2) = ?

The relationship between Volume and Concentration can be represented by formula :

Replacing the given parameters into the formula above , Final Volume (V2) will be :

4.64 is the equilibrium pOH of a 1.0 M solution of formic acid (HCO2H) if Ka=1.8×10⁻⁴ .

A standard for determining the concentration of hydroxide ions in a solution is called pOH, or potential of hydroxide. It is employed to ascertain if a solution is acidic or alkaline. The hydroxide ion (OH -) concentration's negative logarithm, or pOH, is equivalent.

The ion of hydroxide (OH -) content is measured by pOH. It is a way to describe how alkaline a solution is. At 25 degrees Celsius, aqueous solutions with pOH values of 7 or less are neutral, whereas those with pOH values of 7 or more are acidic.

                                       HCOO⁻ + H₂O   ⇄   HCOOH + OH⁻

At t=0                              1.0                          -              -

At t =equilibrium           (1.0-x)                          x           x    

Ka=[ HCOOH][ OH-]/HCOO-

1.8×10⁻⁴ = X²/  (1.0-x)          

x=0.44×10⁻⁵  

pOH = -log[OH⁻] = -log(0.44×10⁻⁵) = 4.64

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Part 1. Effect of Structure1-bromobutane will react first and 2-bromobutane will react last, and will not react at all.

Part 2. Steric Effects and the Relative Rates1-bromobutane will react first while neopentyl bromide will not react at all.

Part 3. Effect of the Leaving Group1-chlorobutane will react first while 1-bromobutane will react last

Part 1. Effect of Structure1-bromobutane will react first, and 2-bromobutane will react last, and will not react at all. This is because 1-bromobutane has a primary carbon while 2-bromobutane has a secondary carbon.

Therefore, 1-bromobutane will undergo SN2 reaction while 2-bromobutane will undergo SN1 reaction. In the SN2 reaction, the reaction rate depends on the strength of the nucleophile while in the SN1 reaction, the rate-determining step is the carbocation formation.

Part 2. Steric Effects and the Relative Rates1-bromobutane will react first while neopentyl bromide will not react at all. This is because neopentyl bromide has a bulky tertiary carbon that has a high steric hindrance that prevents nucleophile from attacking it. Therefore, the reaction rate decreases.

Part 3. Effect of the Leaving Group1-chlorobutane will react first while 1-bromobutane will react last and will not react at all. This is because Cl- ion is a better leaving group than Br- ion. In a SN2 reaction, the better the leaving group, the faster the reaction rate. Therefore, 1-chlorobutane will undergo SN2 reaction while 1-bromobutane will undergo SN1 reaction.

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Using the ideal gas law, we can find that the temperature \(T_2\) at which the gas occupies a volume of 3.85 L under a pressure of 0.700 atm is approximately 424 K.

To solve this problem, we can use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.

We are given the initial conditions: \(P_1\) = 0.500 atm, \(V_1\) = 3.80 L, and \(T_1\) = 80 °C. We need to find \(T_2\), the temperature at which the gas occupies a volume of \(V_2\) = 3.85 L under a pressure of \(P_2\) = 0.700 atm.

First, let's convert the initial temperature to Kelvin by adding 273.15 to 80 °C, giving us \(T_1\) = 353.15 K.

Now, we can set up the equation using the initial conditions:

\((P_1 \times V_1) / T_1 = (P_2 \times V_2) / T_2\)

Substituting the given values, we have:

\((0.500 atm \times 3.80 L) / 353.15 K = (0.700 atm \times 3.85 L) / T_2\)

Simplifying the equation, we get:

\(T_2 = (0.700 atm \times 3.85 L \times 353.15 K) / (0.500 atm \times 3.80 L)\)

Calculating this expression, we find:

\(T_2\) ≈ 423.79 K

Therefore, at a temperature of approximately 424 K, the same amount of gas will occupy a volume of 3.85 L under a pressure of 0.700 atm.

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The variables are acid ionization constant, weak acid concentration, acidity of solution, and conjugate base concentration.

In the equation pH = pKa + log ([A^-]/[HA]), the variables are:

Therefore, the variables are: acid ionization constant, weak acid concentration, acidity of solution, and conjugate base concentration.

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According to the graph, only the reactant A was present at the beginning of the reaction.

The graph shows the concentration for the reactant A and the product that is A2. In this graph, the concentration is displayed on the vertical axis, while the horizontal axis shows the time.

In general terms, it can be observed that at the beginning only the reactant A is present, but as the reaction occurs the concentration of this reactant decreases, while the concentration of the product A2 increases.

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Answer:

459.11 g.

Explanation:

hope this helps

The third line from the red end in the Bohr series of lines of the hydrogen spectrum corresponds to the electron transitioning from the fifth energy level (n=5) to the second energy level (n=2) in a hydrogen atom.

In the Bohr model of the hydrogen atom, electrons occupy specific energy levels or orbits around the nucleus. When an electron transitions from a higher energy level to a lower energy level, it emits a photon of specific energy, which corresponds to a particular wavelength or color of light.

The energy levels in the hydrogen atom are represented by quantum numbers, with the first energy level (closest to the nucleus) corresponding to n=1, the second level to n=2, and so on. The formula to calculate the energy of an electron in the nth energy level is given by the equation: E = -13.6/n^2 electron volts (eV).

To determine the specific transition corresponding to the third line from the red end in the hydrogen spectrum, we need to find the energy difference between the involved energy levels. The energy difference (ΔE) can be calculated using the equation: ΔE = E(final) - E(initial).

For the given transition, the initial energy level is the fifth level (n=5), and the final energy level is the second level (n=2). Plugging these values into the energy equation, we can calculate the energy difference:

ΔE = [-13.6/(2^2)] - [-13.6/(5^2)] = -13.6/4 + 13.6/25 = -3.4 + 0.544 = -2.856 eV.

The energy difference corresponds to the energy of the emitted photon, which can be used to determine the wavelength or color of light. However, the question specifically asks for the inner-orbit jump, and based on the energy levels involved, we can conclude that the electron transition is from the fifth energy level (n=5) to the second energy level (n=2).

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The synthesis of carboxylic acid can be done by hydrolysing the nitrile which is substituted in place of halide by using cyanide ion. The structure that contains a nitrile is OCH2C≡N.

A nitrile is an organic compound that contains a carbon triple bonded to a nitrogen atom.

The general formula for a nitrile is R–C≡N, where R is an alkyl or aryl group. In the structure OCH2C≡N, the OCH2 group is the alkyl group and the C≡N is the nitrile functional group. Therefore, this structure contains a nitrile.

To synthesize a carboxylic acid from an alkyl halide, you can first convert the alkyl halide to a nitrile through a substitution reaction with a cyanide ion. The nitrile can then be hydrolyzed to form a carboxylic acid. The overall reaction is:

R–X + CN– → R–C≡N → R–COOH

Where R is an alkyl or aryl group, X is a halogen, and CN– is a cyanide ion.

In conclusion, the structure that contains a nitrile is OCH2C≡N and it can be used to synthesize a carboxylic acid from an alkyl halide through a substitution reaction followed by hydrolysis.

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Considering the definition of molar mass, the number of moles of Zn reactant used is 2 moles.

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The balanced reaction is:

Zn(s) + 2 HCl(aq) → ZnCl₂ + H₂(g)

Assume that 130.8 grams of Zn was used in this reaction.

To determine the number of moles of hydrogen gas formed, you need to know the number of moles of Zn reactant was used.

So to determine the number of moles used you know that the molar mass of Zn is 65.37\(\frac{g}{moles}\). Then:

\(molar mass=\frac{mass}{number of moles}\)

\(65.37\frac{g}{moles} =\frac{130.8 g}{number of moles}\)

Solving:

number of moles× 65.37\(\frac{g}{moles}\)= 130.8 g

\(number of moles=\frac{130.8 g}{65.37\frac{g}{moles}}\)

number of moles≅ 2 moles

Finally, the number of moles of Zn reactant used is 2 moles.

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The compound CS₂ is called carbon disulfide in chemistry.

With the chemical formula CS₂ and the structural formula S=C=S, carbon disulfide (commonly known as carbon disulfide) is a significant inorganic molecule in chemistry. It is a white liquid that serves as a component in the synthesis of organic compounds.

Several industries utilise carbon disulfide. Many compound like Rubber, viscose rayon, cellophane are made up of it.

The group of inorganic substances known as other non-metal sulfides includes CS₂. These are inorganic compounds with a sulfur atom in an oxidation state of 2, where the most massive atom linked to the oxygen is a member of the other non-metals group.

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Tpr (temperature, pressure, and relief) valves must be set to discharge at a temperature no higher than 210°F.

Temperature can simply be defined as the degree of hotness or coldness of a body.

The instrument used for measuring temperature is thermometer

So therefore, Tpr (temperature, pressure, and relief) valves must be set to discharge at a temperature no higher than 210°F

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Answer:

J. J. Thomson

Explanation:

This is called the plum pudding model which was proposed by J. J. Thomson.

There were 0.01 moles of HCl present in the 10.0 mL sample.

The balanced chemical equation for the reaction between HCl and Ba(OH)2 is:

2HCl + Ba(OH)2 -> 2H2O + BaCl2

From the equation, we can see that two moles of HCl are required to react with one mole of Ba(OH)2.

To find the number of moles of HCl in the sample, we need to first calculate the number of moles of Ba(OH)2 that reacted with the HCl.

The number of moles of Ba(OH)2 is given by:

moles of Ba(OH)2 = concentration x volume (in liters)

moles of Ba(OH)2 = 0.4 mol/L x (12.5/1000) L

moles of Ba(OH)2 = 0.005 mol

Since two moles of HCl react with one mole of Ba(OH)2, the number of moles of HCl is:

moles of HCl = 2 x 0.005 mol

moles of HCl = 0.01 mol

Therefore, there were 0.01 moles of HCl present in the 10.0 mL sample.

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4.01 grams of Licl are needed to release this amount of heat

The gram is a unit of mass in the International System of Units (SI) that is equal to one thousandth of a kilogram. It was originally known as the gramme. Gram. This pen cap weighs around one gram. A weight scale like this one may provide a precise mass readout for many different things.

Mass of Licl required to release 5850J of heat to the surroundings.

Let x g Licl required.

Then x g ×∆H = 5850J

x g × 1.46 × 10³ = 5850

x = 5850/ 1.46 × 10³

x = 4.0068

so 4.01g Licl required.

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