Balance the chemical equation

Answer:

formula of concentration ion.

Answer: Evaporation Condensation is used to seperate the parts of a mixture

Explanation: This is because it is the first order of the distilation process

The use of evaporation and condensation to separate the parts of a mixture is called distillation.

What is distillation?

Separating salt water to produce pure water and salt is an example of a simple distillation mixture.

The water begins to evaporate during the distillation process, and the vapor cools down to form pure water.

A second container is used to collect the pure water.

Thus, the use of evaporation and condensation to separate the parts of a mixture is called distillation.

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The concentration of the final solution after mixing water into the H₂SO₄ is 0.375 M.

Concentration in terms of molarity will be calculated by using the below formula as:

M₁V₁ = M₂V₂, where

M₁ = molarity of H₂SO₄ = 1.50 M

V₁ = volume of H₂SO₄ = 50 mL

M₂ = molarity of water = ?

V₂ = volume of water = 200 mL

On putting all values on the above equation, we get

M₂ = (1.50)(50) / (200) = 0.375 M

Hence option (2) is correct.

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The molar mass of Oz is 48 g/mol is true.

Molar mass of a substance is the mass of 1 mole of that substance or it is the number of grams per mole of a substance. The units for molar mass is grams/mole.

Therefore,The molar mass of Oz is 48 g/mol is correct because ozone have three oxygen and the molar mass of one oxygen is 16g/mol.

Ozone= 16×3

Ozone=48g/mol.

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Answer:

25% is left   15 gm

Explanation:

(1/2)^2 = 25%

Answer:

b. 25% unchanged and 75% stable

Explanation:

got it right on edge

Answer:

( c ) sunlight.

Explanation:

the leaves are closer to the sunlight they require.

The phosphate group attached to the 5' carbon of the sugar on one nucleotide forms an ester bond with the free hydroxyl on the 3' carbon of the next nucleotide.

The mass of NiCl₂•6HO₂ needed to prepare a 0.035 M 500 mL solution of NiCl₂•6HO₂ is 4.165 g

This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

Mole = Molarity × Volume

Mole of NiCl₂•6HO₂ = 0.035 × 0.5

Mole of NiCl₂•6HO₂ = 0.0175 mole

Mass = mole × molar mass

Mass of NiCl₂•6HO₂ = 0.0175 × 238

Mass of NiCl₂•6HO₂ = 4.165 g

Thus, 4.165 g of NiCl₂•6HO₂ is needed to prepare the solution

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The grams of NiCl₂.6H₂O will be used to prepare a 0.0350M, 500ml of NiCl₂ solution is 2.268 grams.

Mass in grams of any substance will be calculated by using moles as:

n = W/M, where

W = given mass

M = molar mass

Moles from molarity will be calculated by using the below formula:

M = n/V, where

M = molarity of NiCl₂ solution = 0.0350M

V = volume of solution = 500mL = 0.5L

On putting values, we get

n = (0.035)(0.5) = 0.0175 mol

Now we convert these moles into grams by using the first formula as:
W = (0.0175mol)(129.6g/mol) = 2.268g

Hence required mass of NiCl₂.6H₂O is 2.268g.

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Answer:

A weak base is a base that, upon dissolution in water, does not dissociate completely, so that the resulting aqueous solution contains only a small proportion of hydroxide ions. PH 7-10

A strong base is a base that is completely dissociated in an aqueous solution. a PH of about 12-14

The 2,4 and 5 positions are accessible for nitration of 1,3‑dimethylbenzene. The final product is shown in the image attached.

Nitration is a type of reaction in which the nitro group (-NO2) is introduced to an aromatic ring. We have to note that in the compound 1,3‑dimethylbenzene, the 2,4 and 5 positions are accessible for nitration as shown.

Hence, the nitration of 1,3‑dimethylbenzene occurs  as shown in the image attached with the compound shown being the major product.

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The structure of the major nitration product from the reaction of nitric acid with 1,3‑dimethylbenzene is shown in attached image.

Nitration is a process in which addition of nitro group (-NO₂) is taking place on the substrate molecule.

In the given question 1,3‑dimethylbenzene is the susbtarte in which nitration will be done in the presence of sulphuric acid (H₂SO₄) and nitric acid (HNO₃). Methyl groups which are present in the substrate molecule will behave as an ortho para directing groups as they are electron donating groups. So the major product obtained in the reaction is shown below in image.

Hence the structure of major nitration product is shown below in image.

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The equation that shows conservation of both mass and charge is:

(4) Ni + Pb²⁺ → Ni²⁺ + Pb

Which equation shows conservation of both mass and charge?

(1) Cl₂ + Br → Cl⁻ + Br

No, the equation does not show conservation of mass nor charge.

(2) Cu + 2 Ag⁺ → Cu²⁺ + Ag

No, the equation does not show conservation of mass.

(3) Zn + Cr³⁺ → Zn²⁺ + Cr

No, the equation does not show conservation of charge.

(4) Ni + Pb²⁺ → Ni²⁺ + Pb

Yes, the equation show conservation of mass and charge.

The equation that shows conservation of both mass and charge is:

(4) Ni + Pb²⁺ → Ni²⁺ + Pb

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Decomposition reaction results in the formation of the products by splitting the reactants. Moles of mercury(ii) oxide needed are 15.63 moles.

Moles are the ratio of mass and the molar mass of the compound or the molecule.

Moles of oxygen are calculated as:

[tex]\begin{aligned}\rm n &= \rm \dfrac {mass}{molar\; mass}\\\\&= \dfrac{250}{32}\\\\&= 7.8125 \;\rm moles\end{aligned}[/tex]

The balanced chemical reaction can be shown as,

[tex]\rm 2HgO \rightarrow 2Hg + O_{2}[/tex]

From the reaction, it can be said that 1 mole of oxygen requires 2 moles of mercury oxide.

Moles of mercury oxide are calculated as:

[tex]\begin{aligned} \rm n HgO& = (7.8125 \;\rm moles \; O_{2}) \times (\dfrac{2 \;\rm moles\; HgO}{1 \;\rm mole \; O_{2}})\\\\\rm n HgO &= 15.625 \;\rm moles \end{aligned}[/tex]

Therefore, option C. 15.63 moles of mercury (II) oxide is needed.

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In Ferromagnetism, materials are changed into permanent magnets.

Ferromagnetism is a process in which specific materials are turned into permanent magnets. The spins of electrons are shifted and electrons become more aligned and sequence with the direction of the field.

So we can conclude that in Ferromagnetism, materials are changed into permanent magnets.

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a leguminous plant, Phaseolus aureus, whose seeds are used as food in India.

Answer:

Green Gram is a small round edible green bean which is also known as moong ki daal in the subcontinent.

Explanation:

The green gram bean which is also known as the mung, maash or moong, is a plant species in the legume family. The green gram bean is mainly cultivated in East, Southeast and South Asia. It is used as an ingredient in both savoury and sweet dishes.

Option C) 19.3L is the correct answer.

Hence, the final volume of the gas at the standard atmospheres and temperature is 19.3L.

Given the data in the question;

At Standard temperature and pressure( STP)

Then

Final Volume; [tex]V_2 = \ ?[/tex]

Combined gas law combines both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]

To determine the new volume of the gas, we substitute our values into the expression above.

[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}\\\\P_1V_1T_2 = P_2V_2T_1\\\\1.00atm * 29.3L * 250.15K = 1.39atm * V_2 * 273.15K\\\\7329.395atm.L.K = 379.6785atm.K * V_2\\\\V_2 = \frac{7329.395atm.L.K}{379.6785atm.K} \\\\V_2 = 19.3L[/tex]

Option C) 19.3L is the correct answer.

Hence, the final volume of the gas at the standard atmospheres and temperature is

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From the available options with respect to Taylor's experiment, none of the data is qualitative.

These are data that cannot be measured using any instrument or assigned a numerical value.

Qualitative data are observable data based on perception.

This is unlike quantitative data that can be measured using relevant instruments and assigned numeric figures.

Mass can be measured in grams using a weighing balance, angle of inclination can be measured using relevant instruments, and time can be measured using a stopwatch.

Thus, none of the options is qualitative.

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Answer:

None are Qualitative

Explanation: I took the test and got a 100%

The use of ethanol instead of acetic acid is not the wise choice.

When you are out of acetic acid and decide to use ethanol as the solvent in the transformation, it would not be a wise choice because acetic acid and ethanol are two totally different chemicals. Due to different in features, it can't act the same and the desirable results can't be observed.

So we can conclude that use of ethanol instead of acetic acid is not the wise choice.

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To use ethanol in place of acetic acid as a solvent in the transformation of 3 into 4, is not a wise choice.

Functional groups are the specific groups which after attaching to any molecule changes the property of the molecule.

Acetic acid has carboxylic (-COOH) group as functional group and ethanol has hydroxyl (-OH) functional group and both has different properties from each other. So use to ethanol in place of acetic acid is not correct as it will not fulfill the requirements of acid.

Hence use of ethanol in place of acetic acid is not a wise choice.

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Answer:

Explanation:

The elements in Group I of the periodic table are called alkali metals. They are called alkali metals because they react with water to form alkali solutions. These metals are very reactive; hence they have to be stored under oil to protect them from corrosion by air and waterwaterwater

The group 1A elements, called alkali metals because they form alkalies on reacting with water. Alkalies are strong bases.

They are the metals that are soft, lustrous, and have a low melting point. Air and moisture react readily with alkali metals.

Special precautions must be taken when using and storing these metals due to their reactivity.

The seven alkali metals are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

Thus, the group 1A elements, called alkali metals because they form alkalies on reacting with water. Alkalies are strong bases.

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Flood plains are desirable farm land in spite of the fact that they are prone to flooding because of its high fertility.

Floodplains are very fertile agricultural areas because the floods carry nutrient-rich silt and sediment and deposited it that plains. Floodplains are flat which make easier farming.

So we can conclude that flood plains are desirable farm land because of its high fertility.

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Answer:

please give a photo I can't now to help u

Answer:

they have a crystalline structure is the correct answer <3

Explanation:

Explanation:

When a carboxylic acid is treated with an alcohol and an acid catalyst, an ester is formed (along with water). This reaction is called the Fischer esterification.

The reaction between alcohols and carboxylic acids is called Fischer esterification.

Fischer Esterification is an organic reaction that produces an ester by converting carboxylic acids in the presence of excess alcohol and a strong acid catalyst.

This ester is created in the presence of water.

Thus, the reaction between alcohols and carboxylic acids is called Fischer esterification.

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The equilibrium for the dissolution of the weak base is ;(CH3)2NH(aq) + H2O(l) ⇄ (CH3)2NH3^+(aq) + OH^-(aq)

A weak base is one that does not ionize completely in solution. As such, a weak base will have a very low base dissociation constant Kb reflecting its minimal dissociation in solution.

The question is incomplete hence we are are unable to work out the equilibrium but in solution it will look like this;

(CH3)2NH(aq) + H2O(l) ⇄ (CH3)2NH3^+(aq) + OH^-(aq)

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The equilibrium for the reaction between (Ch₃)2NH of the weak base is (CH₃)2NH(aq) + H₂O(l) ⇄ (CH₃)2NH₃⁺(aq) + OH⁻(aq).

A weak base is one that does not completely dissociate in water.

It leaves only a small proportion of hydroxide ions and the concerned basic radical in the resulting aqueous solution.

A large proportion of dissociated base molecules.

Thus, the equilibrium for the reaction is (CH₃)2NH(aq) + H₂O(l) ⇄ (CH₃)2NH₃⁺(aq) + OH⁻(aq).

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The Change in Gibb's free energy, ΔG for the reaction at 298K is; -56.92KJ.

It follows from the Gibb's free energy formula as expressed in terms of Enthalpy and Entropy that;

On this note, it follows that;

Hence, the Gibb's free energy for the reaction is;

Remarks: The question requires that we determine the Gibb's free energy for the reaction at 298K.

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The Gibbs free energy for the reaction Br²(g) Cl²(g)⇌2BrCl(g) is -56.92 KJ.

It's the total work done in a closed thermodynamic system.

By the formula of Gibbs free energy

[tex]\rm \Delta G = \Delta H - T \Delta S[/tex]

The H is 14.6 KJ/mol

The change in temperature is 0.24

Putting the values in the equation

[tex]\Delta G = 14.6 - (298 \times 0.24)\\\\ \Delta G = 14.6 - 71.52\\\\ \Delta G = -56.92KJ[/tex]

Thus, the Gibbs free energy for the reaction is -56.92 KJ

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Answer:

0.14 liters nitric acid

Explanation:

Molarity = moles / liter

7.0 M = x / 0.03 L

= 0.21 moles NaOH

0.21 moles NaOH x ( 1 mole HNO3 / 1 mole NaOH) = 0.21 moles HNO3

Molarity = moles / liter

1.5 M  = 0.21 moles / x

x = 0.21 moles / 1.5 M

x = 0.14 Liters HNO3

Answer:

[tex]140mL[/tex]

Explanation:

[tex]M_1V_1=M_2V_2[/tex]

[tex]M_1=1.5M[/tex] molarity of nitric acid

[tex]V_1=?[/tex]  volume of nitric acid

[tex]M_2=7.0M[/tex] molarity of sodium hydroxide

[tex]V_2=30.0mL[/tex] volume of sodium hydroxide

[tex](1.5M)(V_1)=(7.0M)(30.0mL)[/tex]

[tex]V_1 =\frac{(7.0M)(30.0mL)}{1.5M}=140mL[/tex]

Hope this helps whoever needs it :)

Have a good day!!!

Answer:

Ginger ale is a strong acid

Explanation:

This is because of the high amounts of carbonic acid that it contains, putting it below the 4.6 Ph threshold.

The valur of energy of formation ΔGf of H₂O is -228.6 kJ/mol.

ΔG of any reaction will be calculated as:

ΔG = Sum of ΔG of products - Sum of ΔG of reactants

Given chemical reaction is:

4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

For this reaction, ΔG will be calculated as:

ΔG = [ΔGf 4(NO) + ΔGf 6(H₂O)] - [ΔGf 4(NH₃) + ΔGf 5(O₂)]

Given that:

ΔG = -957.9 kJ

ΔGf of NH₃ = -16.66 kJ/mol

ΔGf of NO = 86.71 kJ/mol

ΔGf of O₂ = 0 (because it is present in elemental form)

ΔGf of H₂O = let x (to find)

On putting all these values on the above equation, we get

-957.9 = [4(86.71) + 6(x)] - [4(-16.66) + 5(0)]

-957.9 = 346.84 + 6x + 66.64

6x = -957.9 - 346.84 - 66.64

6x = -1,371.38

x = -228.56 = -228.6 kJ/mol

Hence, correct option is (1) i.e. -228.6 kJ/mol.

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Answer:

A) -228.6 kJ/mol

Explanation:

EDGE 2022

Answer:

an energy level represents the three dimensional space surrounding nucleus where electrons are most likely to be.

Explanation: