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The mass of, [tex]Cu_2S[/tex], compound formed is 77.9g

62 grams of copper reacted with 32grams of sulfur to form copper sulfide.

[tex]Cu + S_2 \rightarrow CuS_2[/tex]

stoichiometry of Cu to S is 2:1

We need to find the limiting reactant

Molar mass of copper = 63.5 g/mol

Molar mass of Sulfur = 32 g/mol

Number of moles of Copper =  [tex]\dfrac{mass} {molar mass } = 0.99mole[/tex]

Number of moles of Sulfur = [tex]\dfrac{mass} {molar mass} = \dfrac{32g} {32g/mol} = 1 mole[/tex]

Since copper have lesser number of moles, therefore the limiting reagent is copper so the amount of product formed depends on amount of Cu present

stoichiometry of Copper to [tex]Cu_2S[/tex] is 2:1

0.99 mol of Copper forms = [tex]\dfrac{0.99} {2}[/tex]  = 0.49 mol of [tex]Cu_2S[/tex]

Mass of [tex]Cu_2S[/tex] produced = Number of moles  [tex]\times[/tex] Molar mass                

Mass of [tex]Cu_2S[/tex] produced = 0.49 mol [tex]\times[/tex] 159 g/mol = 77.9g

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The ionized uranium (238 [tex]U^{5+}[/tex]) has 92 protons, 146 neutrons and 87 electrons.

The U²³⁸ is a stable isotope of Uranium. It cannot sustain a chain reaction.

The atomic number for uranium is 92 and its atomic mass is 238.

The atomic number for U²³⁸ is 92.

So, the number of protons or electrons = 92

Then, the number of neutrons = atomic mass - number of protons

⇒ 238 - 92 = 146

The Uranium is ionized and becomes ²³⁸U⁵⁺.

So,

The number of protons = 92

The number of electrons = 92 - 5 = 87 (Since uranium is ionized by 5+ electrons i.e., removing 5 electrons)

The number of neutrons = atomic mass - number of protons

= 238 - 92 = 146

Thus, when uranium ionizes and becomes ²³⁸U⁵⁺, there are 92 protons, 146 neutrons, and 87 electrons.

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The difference in the electronegativity of the Y-P bond is 0.97.

The term electronegativity has to do with the difference between the ability of two atoms in a bond to attract the shared electrons of the bond towards themselves.

The electronegativity value of Y is 1.22 while the electronegativity value of P is 2.19.

Hence;

ΔEN = 2.19 - 1.22

ΔEN = 0.97

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Answer:

yes

Explanation:

boiling point, freezing point, ph , density  are just a few that would change

The selection of the beaker for heating the solution:

The best reason for choosing the beaker for heating the solution is "The beaker will not tip over when placed on the hot plate".

What is a Beaker?:

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The ratio of the mass of compounds:

a. 2Na + Cl[tex]_{2}[/tex] → 2NaCl = 46 + 70 → 46 : 70

b. H[tex]_{2}[/tex]O + NaO → 2NaOH = 1 : 8 + 23 : 16 → 23 : 16 : 1

c. HCl + NaOH → NaCl + H[tex]_{2}[/tex]O = 1 : 35 + 23 : 35 → 23 : 35 + 1: 8

What is a  molecular mass?

Molecular mass refers to the total sum of the masses of the atoms or components that make up the molecule.

Calculation:

a. 2Na + Cl[tex]_{2}[/tex] → 2NaCl

(Na x 2) + (Cl x 2) → (Na x 2) : (Cl x 2)

(23 x 2) + (35 x 2) → (23 x 2) : (35 x 2)

46 + 70 → 46 : 70

b. H[tex]_{2}[/tex]O + NaO → 2NaOH

(H x 2) : (O x 1) + (Na x 1) : (O x 1) → (Na x 2) : (O x 2) : (H x 2)

(1 x 2) : (16 x 1) + (23 x 1) : (16 x 1) → (23 x 2) : (16 x 2) : (1 x 2)

2 : 16 + 23 : 16 → 46 : 32 : 2

1 : 8 + 23 : 16 → 23 : 16 : 1

c. HCl + NaOH → NaCl + H[tex]_{2}[/tex]O

(H x 1) : (Cl x 1) + (Na x 1) : (Cl x 1) → (Na x 1) : (Cl x 1): (H x 2) : (O x 1)

(1 x 1) : (35 x 1) + (23 x 1) : (35 x 1) → (23 x 1) : (35 x 1) : (1 x 2) : (16 x 1)

1 : 35 + 23 : 35 → 23: 35 + 2: 16

1 : 35 + 23 : 35 → 23 : 35 + 1: 8

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Answer:

The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.

Explanation:

As molecules heat they begin to move faster. The heat from the metal plate will make the molecules at room temperature move faster. And the room temperature makes the hot place cool, making the hot plate molecules slow down.

To visualize this, you can use this link

https://phet.colorado.edu/en/simulations/gas-properties

click the play button to activate the activity

Answer:

1.A solvent is a liquid in which another substance is dissolved to form a solution. Examples of solvents include water, alcohol, and vinegar.

2.A solute is a substance that is dissolved in a solvent to form a solution. Examples of solutes include salt, sugar, and caffeine.

3.Several factors can influence the solubility of a solute in a solvent, including the nature of the solute and solvent, the temperature, and the pressure.

Explanation:

Answer:

D. The amount of nitrogen dioxide and sulfur dioxide would increase.

Explanation:

Because the reaction is exothermic, heat is a product. According to Le Chaetelier's Principle, a system in equilibrium will adjust itself so as to relieve any stress placed upon it. If the temperature of the system increases, there are more products, and therefore the system is no longer at equilibrium. Thus, it will shift to favor the reactant side of the equation, where sulfur dioxide and nitrogen dioxide are located. This makes the answer D.

Edit: Brainly thinks that the correct spelling of 'Le Chaetelier' is a bad word so that's why it is spelled wrong lol.

All are correct statements:-

Recrystallization is a technique for purifying solid compounds. Solids tend to dissolve more in hot liquids than in cold liquids. During recrystallization, the impure solid compound is dissolved in a hot liquid until the solution is saturated, after which the liquid is cooled.

Toluene is a clear, colorless liquid that evaporates in the air at room temperature. Toluene smoke has a pungent or sweet odor, which is a sign of exposure. Toluene is typically used as a mixture with other solvents and chemicals such as paint pigments. Inhalation of small doses of toluene vapor can cause mild headaches, dizziness, drowsiness, or nausea.

Filtration is the process of separating an insoluble solid from a liquid. When filtering a mixture of sand and water: the sand remains on the filter paper (it becomes a residue). Water flows through the filter paper (it becomes a filtrate). Gravity filtration and vacuum or suction filtration are the types of filtration.

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Answer:

Not so sure. Hope it helps...

Answer:

1.02 N/mm2

Explanation:

We can see that the pressure is applied on the small weight that covers the opening.

The area of the circular opening is π(0.512 mm)

= 0.824 mm2

Pressure = Pressure = Force / Area

=  (0.847 N) / (0.824 mm2)

= 1.02 N/mm2

Answer:

m/s

Explanation:

One 'm' and one 's' in the numerator and the denominator 'cancel out' and you are left with  m / s

An ionic compound is composed of a cation (generally, a metal ion) and an anion (a nonmetal ion). The cation and the anion combine due to the Coulombic force of attraction to form an ionic lattice. The metal atom releases one or more electrons and the nonmetal receives these electrons until they fulfill their octet.

Ionic compounds are held together by opposite charges but do not have a charge. You have to balance the +’s and -‘s. Ba has a charge of +2 F has a charge of -1 You need 2 F- to balance the +2 of Ba BaF2.

a) BaF2 or barium fluoride

b) CsCl or cesium chloride

c) Li3N or lithium nitride

d) Al2O3 or aluminum oxide

Barium And Fluorine

Please check the attached file for a detailed answer.

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Concentration of Hydronium ions in the Acetic acid is [tex]1.58\times10^{-5}[/tex]

Calculation of concentration of acid:

pH of a solution is defined by the concentration of Hydronium ions in the solution.

Also, pH is defined as the negative of logarithm of [tex]log[H^+][/tex]

[tex]pH= -log[H^+][/tex]

pH of Acetic acid= 4.8

Therefore,

[tex]4.8= -log[H^+][/tex]

Taking antilog, we get

[tex][H^+] = 0.0000158M= 1.58\times10^{-5}M[/tex]

The Hydronium concentration of the acetic acid is [tex]1.58\times 10^{-5}[/tex]M.

As Acetic acid is a weak acid which means that ionization of acid is not complete, ie. 100%

That is why the concentration of Hydronium ions are less in the solution.

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[tex]\\ \tt\leadsto pH=-log[H^+][/texM

[tex]\\ \tt\leadsto pH=-log[3.4\times 10^{-11}][/tex]

[tex]\\ \tt\leadsto pH=-log3.4-log10^{-11}[/tex]

[tex]\\ \tt\leadsto pH=-0.53+11[/tex]

[tex]\\ \tt\leadsto pH=10.47[/tex]

Basic

Considering the definition of pH, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.

pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]= - log [H₃O⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

In this case, you know [H₃O⁺]= 3.4×10⁻¹¹ M.

Replacing in the definition of pH:

pH= -log (3.4×10⁻¹¹ M)

Solving:

pH=  10.47

Finally, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.

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Answer:

Explanation:

Answer: D. Solid

Answer: 15.999 grams.

Explanation: The molar mass of an element is the mass of one mole of that element. You can also solve this with a little bit of math.

[tex]15.999gO*\frac{1molO}{15.999gO} =1molO[/tex]

I hope this helps! Pls mark brainliest!! :)

The measurement of the countries' carbon stock through field surveys by has been unhelpful, because the officials don't make their countries' land holdings readily available for study.​

An inference can be defined as an act through which a reader can deduce the meaning and message (information) that is associated with certain text in a passage, especially through induction.

In this scenario, we can infer and logically deduce that the author implied that the measurement of the countries' carbon stock through field surveys by has been unhelpful, because the officials don't make their countries' land holdings readily available for study.​

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Complete Question:

The authors imply that the response of various officials to attempts to

measure their countries' carbon stock through field surveys has been:

A. unhelpful, because they fear that jobs for their countries' scientists will be lost.

B. helpful, because their countries have invested significantly in technology to allow studies to expand.

C. helpful, because their countries stand to benefit from universal carbon data that the studies will uncover.

D. unhelpful, because they do not make their countries' land holdings readily available for study.​

The new volume of the gas, given the data is 1.3 L

The new volume of the gas can be obtained by using the combined gas equation as illustrated below:

P₁V₁ / T₁ = P₂V₂ / T₂

(1 × 10) / 273 = (7 × V₂) / 250

Cross multiply

273 × 7 × V₂ = 10 × 250

Divide both sides by 273 × 7

V₂ = (10 × 250) / (273 × 7)

V₂ = 1.3 L

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Answer:

NH3

Explanation:

In solution, they are in equilibrium. NH4+ acts as a bronsted Lowry acid and donates an H to become NH3, and NH3 acts as a bronsted lowry base and accepts an H. In this pair, NH3 is a weak base, which gets its basic character due to the presence of lone pair of nitrogen and its ability to donate it.

Answer:

these two would help you

Explanation:

have a good day ᕕ( ᐛ )ᕗ

Answer:

Chemical bonds are how atoms, and even molecules join together.

Explanation:

There are two main types of primary chemical bonds. While secondary links relate to molecules, primary ties are atom to atom. This answer explains basic primary bonds only.

One must comprehend what a valence shell is before I proceed. The outer electron orbital of an atom is known as the valence shell. Most of the time (except from hydrogen), atoms desire to have 8 electrons in their valence shell, thus they form bonds with other atoms to accomplish this.

All bonds result in a new chemically different molecule. Now, the two types are:

Answer:

a between c and o

Explanation:

♡´･ᴗ･`♡

The percentage of words in the book which have more than two syllabus: Can't decide. The number of pages in the first chapter is extensive property. The shipping cost of the book (which depend on weight) is extensive property.

The property which do not depend on the quantity or amount of matter is called Intensive Property. The intensive properties are pressure, temperature, density, concentration, taste, color etc.

The property which depend upon the amount of matter in a sample is  called Extensive property. The extensive properties are mass, volume, heat capacity, weight, length, shape etc.

The percentage of words in the book which have more than two syllabus in this case we cannot decide whether it is extensive property or intensive property.

The number of pages in the first chapter is extensive property because the pages have some mass and mass is extensive property.

The shipping cost of the book (which depend on weight) is extensive property as weight is an extensive property which depend upon the amount of matter.

Thus from the above conclusion we can say that The percentage of words in the book which have more than two syllabus: Can't decide. The number of pages in the first chapter is extensive property. The shipping cost of the book (which depend on weight) is extensive property.

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The volume of chlorine required is 7.71 L.

The reaction between phosphorus and chlorine is:

2P + 5Cl₂→ 5PCl₅

Therefore, 2  moles of P requires 5 moles of chlorine to react with it.

Given mass of P =3.39 g

Molar mass of P=30.97 g/mol

No. of moles of P = given mass/ molar mass = 3.39 / 30.97 = 0.109 moles

2  moles of P requires 5 moles of chlorine

0.109  moles of P will require 0.109 x 5/2 = 0.2725 moles of chlorine

According to ideal gas equation

PV=nRT

2.04 x V = 0.2725 x 0.0821 x 703

V = 0.2725 x 0.0821 x 703 / 2.04

V = 7.71L

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Answer:

In the dephosphorylated structure, the enzyme is stabilized via coordination of a phosphate ion by the active-site histidine residue and the two ...

The new volume V₂ is 5.4L

The new volume is calculated using Boyle's law formula

That  is  P₁V₁=P₂V₂

where,

p₁ =  852 torr

V₁ = 27.0

P₂ = 4260 torr

V₂=?

Make  V₂ the subject of the formula by diving into both sides of the equation by P₂

V₂ = P₁V₁/P₂

⇒ 852 *

V₂  is, therefore, = 5.4 L

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Answer:

X = 350 kJ/mol

Explanation:

According to the question:

Energy needed when breaking bonds  +  1640 kJ/mol   =   Energy released when forming bonds

∴ 2 (C - C) + 8 (C - H) + 5 (O = O) + 1640 = 6(C = O) + 8(O - H)

⇒ 2 (X) + 8 (410) + 5 (500) + 1640 = 6 (740) + 8 (460)

⇒ 2X  +  7420  =  8120

⇒ 2X = 700

⇒ X = 350 kJ/mol