SCIENCE help pls need kna​

Answer: The net charge on the cloth with be negative.

Explanation:

Because electrons are being transferred from the neutral rod to the neutral rod to the neutral cloth, the cloth will become negative due to the excess electrons. (The rod will also become positively charged, but that’s beyond the scope of the question.)

When a neutral cloth and a neutral rod are rubbed together then the final charge on the cloth is negative.

Whenever electrons are transferred between objects, neutral matter becomes charged. For example, when atoms lose or gain electrons they become charged particles called ions. Three ways electrons can be transferred in a material that are conduction, friction, and polarization.

Rubbing a neutral rod with a neutral cloth also transfer charge from both the material. We know that a metal rod is a conductor of electricity whereas the cloth is an insulator that does not conduct electricity. When both the rod and cloth is rubbed, electrons are transferred due to friction on the material. Electrons are always negatively charged. As the rod and cloth is rubbed, the electrons flow from the rod to the cloth thereby making the rod as positively charged and the cloth as negatively charged.

Thus, when a neutral cloth and a neutral rod are rubbed together then the final charge on the cloth is negative.

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Balanced equation: 2 HI --> I2 + H2

Explanation:

HI-

H = 1 x 2 = 2

I = 1 x 2 = 2

H2-

H = 2

I = 2

The molecular formula for a compound with a percent composition of 38.7% C, 9.76% H, 51.5% O, and a molar mass of 62.0 g/mol is C₂H₆O₂.

A molecular formula is a chemical formula indicating the kinds and number of atoms of each kind in a molecule of a compound.

To determine the molecular formula, we need to follow a series of steps.

C: 38.7/12.01 = 3.22

H: 9.76/1.01 = 9.66

O: 51.5/16.00 = 3.22

C: 3.22/3.22 = 1

H: 9.76/3.22 = 3

O: 3.22/3.22 = 1

The empirical formula is CH₃O and its molar mass is 31.04 g/mol.

First, we will calculate how many times the empirical formula is contained in the molecular formula by dividing their molar masses.

n = (62.0 g/mol) / (31.04 g/mol) = 2

The molecular formula is 2 times the empirical formula, that is, C₂H₆O₂.

The molecular formula for a compound with a percent composition of 38.7% C, 9.76% H, 51.5% O, and a molar mass of 62.0 g/mol is C₂H₆O₂.

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For a thermodynamic data at 298k, when 2. 34 moles of nh3(g) react at standard conditions, the free energy change is mathematically given as

dG'−213.174KJ

Generally, the equation for the Chemical Reaction   is mathematically given as

HCL+NH3----->NH4Cl

Therefore

dG=-202.9-[-16.5+(95.3)]

dG=-91.1KJ/mol

In conclusion, For 2.34 moles

dG'=-91.1KJ/mol*2.34

dG'−213.174KJ

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The free energy change when 2.34 moles of NH₃(g) react at standard conditions is -213.174 kJ.

Free energy change of any chemical reaction will be calculated by using the following chemical reaction:

ΔG = Free energy of products - Free energy of reactants

Given chemical reaction is:

NH₃ + HCl → NH₄Cl

From the stoichiometry of the reaction it is clear that same moles of ammonium chloride is produced by the same moles of ammonia & hydrochloric acid.

Free enrgy of NH₄Cl = -202.9 kJ/mol

Free enrgy of NH₃ = -16.5 kJ/mol

Free enrgy of HCl = 95.3 kJ/mol

On putting values in the above equation, we get

ΔG = -202.9-[-16.5+(95.3)]

ΔG = -91.1KJ/mol

For 2.34 moles, ΔG will be:

ΔG = (2.34)(-91.1) = -213.174 kJ

Hence required amount of free eenrgy is -213.174 kJ.

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The final pressure or the air pressure on the top of the mountain is 0.818.

Air pressure is the pressure exerted by air in the atmosphere of the earth.

By the Gas law

[tex]\dfrac{P_1V_1}{ T1} =\dfrac{ P_2V_2 }{T_2}[/tex]

Given, the pressure of the valley floor is 1 atm. = P1

The temperature is 25° C = T1

The volume of the bag is 0.985 L. = V1

The temperature at the top of the mountain is ° C = T2

Now, the volume of the bag is 1. 030 L = V2

To find P2

Put the values in the formula

[tex]\dfrac{1 atm \times0.985 L}{ 25} =\dfrac{ P_2 \times 1. 030 L }{22}\\\\0.03832 = 0.0468 \times P_2\\\\P_2= 0.818[/tex]

Thus, the final pressure is 0.818.

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Answer:

products, it's answer A.

Answer:

products

Explanation:

Answer:

Circuit 1 = ?

Circuit 2 = Parallel

Explanation:

Since circuit 1 isn't shown on the picture, it's probably a series circuit, but if circuit 1 is a box with symbols around it, then it's a series circuit. But if it has three or more horizontal lines/cables like circuit 2, then it's a parallel circuit - circuit 2 has a second horizontal line with an open switch and lamp.

Circuit 2 is a parallel circuit, as it has branches/horizontal lines (that were explained in the paragraph above).

If enough HCl is not added, the percent yield will be lower as all the magnesium metal has not reacted with HCl.

The percent yield of a reaction is the ratio of the actual yield and the expected yield expressed as a percentage.

The reaction between magnesium metal and HCl liberates hydrogen gas and forms magnesium chloride salt.

If enough HCl was not added to react with all the magnesium metal, the actual yield will be lower.

Hence, percent yield will be lower as well.

Therefore, the percent yield will be lower if all the magnesium metal has not reacted with HCl.

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B. C4H10

Butane is a straight chain alkane composed of 4 carbon atoms. It has a role as a food propellant and a refrigerant. It is a gas molecular entity and an alkane.

Mass of C2H6 = 30.07 g/mol

Mass of C4H10 = 58.1222 g/mol

Mass of C5H10 = 70.1329 g/mol

Mass of C6H6 = 78.11184 g/mol

The mass of the empirical formula C6H6 is the greatest of all other compounds.

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Answer:

I guess the answer ia point A

Answer:

This question is hard :( I dont know im so sorry

Explanation:

Answer:

An organism's role within an ecosystem depends on how it obtains its food. Plants and animals obtain their food in very different ways, so they have very different roles in an ecosystem. The way in which an organism obtains food also affects its interactions with other organisms in the ecosystem.

Explanation:

Answer:

Atomic weight.

Explanation:

Hope this helps you!

The percent yield of CuO is 96%. The percentage yield shows the extent to which reactants are converted to products.

The percent yield is the actual yield divided by the theroretical yield multiplied by 100.

Now we have the equation;

2Cu(OH)2 → 2CuO + 2H2O

Number of moles of Cu(OH)2 = 6.59 g/98 g/mol = 0.067 moles

Since 2 mole of Cu(OH)2 yeilds 2 moles of CuO

0.067 moles alos yields 0.067 moles of CuO

Mass of CuO = 80 g/mol * 0.067 moles of CuO = 5.36 g

Hence, percent yield =  5.17 g/5.36 g * 100 = 96%

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Answer:

Bitter in taste

Explanation:

Acids according to Robert Boyle taste sour not bitter.

According to Robert Boyle, the option which is not an acid’s property include the following: d) bitter in taste.

In Chemistry, an acidic solution can be defined as a type of aqueous solution that has a high concentration of hydrogen ions (H⁺), which is typically greater than that of pure water.

According to Robert Boyle, the properties of acids include the following:

They turn a blue Litmus paper red.

They are corrosive

They can act as neutralize bases.

They are sour in taste

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Answer:

D. a program on a computer

Explanation:

Answer:

[H+] = 10^-2

Explanation:

pH = -log[H+]

2 = -log[H+]

[H+] = 10^-2

The balanced equations for the  formation of potassium suberate from cyclooctene are;

3KMnO4 + 3C8H18 + 4H2O --> 3C8H17(OH)2 + 2MnO2 + 2KOH and

3C8H14(OH)2 +  6KMnO4 ----> 3KCOO(CH2)6 COOK + 6MnO2 + 6H20

The compound potassium suberate  is obtained from cyclooctene. The first step in the process is the oxidation of cyclooctene using potassium permanganate as follows;

3KMnO4 + 3C8H18 + 4H2O --> 3C8H17(OH)2 + 2MnO2 + 2KOH

This is followed by the production of potassium suberate from the reaction equation;

3C8H14(OH)2 +  6KMnO4 ----> 3KCOO(CH2)6 COOK + 6MnO2 + 6H20

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Balanced chemical equation for the formation of potassium suberate from the cyclooctene is 3KMnO₄+3C₈H₁₈+4H₂O→3C₈H₁₇(OH)₂+2MnO₂+2KOH &

3C₈H₁₄(OH)₂+6KMnO₄→3KCOO(CH₂)₆COOK+6MnO₂+6H₂O

Those equation in which number of each entities present on both sids of the given chemical equation is same is known as balanced equation.

Formation of potassium suberate from the cyclooctene will be complete in following two steps:

(1). In first step oxidation of cyclooctene is done by using potassium permanganate.

3KMnO₄ + 3C₈H₁₈ + 4H₂O → 3C₈H₁₇(OH)₂ + 2MnO₂ + 2KOH

(2). In the second step final product is obtained as a result of the oxidation as.

3C₈H₁₄(OH)₂ +  6KMnO₄ → 3KCOO(CH₂)₆COOK + 6MnO₂ + 6H₂O

Hence the balanced chemical reaction for the formation of potassium suberate is discussed above.

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As temperature increases, the average kinetic energy of a sample of gas molecules decreases.

Answer:

the answer is 11.2 seconds. I listened to the other person and picked 33.6 but that was wrong.

Explanation:

took test

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:

Their electrons have different allowed energy levels

Explanation:

Elements are the pure form that only consists of the atoms of the same proton number. Distinct colors are produced in the flame test as their electrons have different energy levels.

A flame test is a procedure that detects the presence of chemical substances based on a spectrum and colors emitted by the elements in the flame.

The energy levels of the different elements vary and are defined by the movement of the electrons in the spectra. The energy released and the flame produced by different electrons are different.

Therefore, electrons with various energy levels release flames of different colors.

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Agar is used as a solidifying agent in culture media instead of gelatin because it readily melts and it contains no nutrition for bacteria cultures.

Agar is a gelatinous material obtained from red algae and used in the preparation of culture medium.

Agar is used to solidify the culture medium for bacteria growth, although, gelatin can also be used.

However, agar is preferred as a solidifying agent in culture media instead of gelatin because it readily melts and it contains no nutrition for bacteria cultures.

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Answer:

The cell's volume will remain stable.

Explanation:

If a cell is placed in an isotonic solution, there will be no net flow of water into or out of the cell, and the cell's volume will remain stable. If the solute concentration outside the cell is the same as inside the cell, and the solutes cannot cross the membrane, then that solution is isotonic to the cell.

Sodium hydroxide wasn't used in the synthesis of divanillyl oxalate because it's a strong base.

It should be noted that sodium hydroxide simply means a corrosive cystaline solid which readily absorbs moisture until it dissolves.

In this case, sodium hydroxide wasn't used in the synthesis of divanillyl oxalate because it's a strong base and will decrease the yield of the product.

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Divanillyl oxalate is a chemical that is produced by triethylamine. Sodium hydroxide is not used in its synthesis as it is a strong base.

Sodium hydroxide or caustic soda is an ionic compound with ions of sodium and hydroxide. The formula is shown as, [tex]\rm NaOH[/tex]. It is crystalline and absorbs moisture from the surrounding.

It is not used in the synthesis of divanillyl oxalate as it is a strong base with pH 14 that affects the yield of the product in the reaction.

Therefore, sodium hydroxide is not used in the synthesis reaction.

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A double displacement reaction is a type of reaction in which two reactants exchange ions to form two new compounds. Many double displacement reactions occur between ionic compounds that are dissolved in water. A double replacement reaction is represented by the general equation.

In acidic solition, the coefficient of permanganate ion in the balanced redox equation is 2.

A redox equation showing a reduction and an oxidation reaction occurring simultaneously.

To balance redox equations, the atoms reacting as well as the electrons transferred are balanced.

In the reaction of permanganate ion and bromide ion in acidic solution, the balanced redox equation is given as follows:

Therefore, the coefficient of permanganate ion in the balanced redox equation is 2.

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The coefficient of the permanganate ion of the MNO₄ - Br- → MN₂ + Br₂ is 2.

A redox equation depicting a simultaneous reduction and oxidation reaction.

The atoms reacting as well as the electrons transferred must be balanced to balance redox equations.

The balanced redox equation for the reaction of permanganate ion and bromide ion in acidic solution is:

[tex]\rm 2 MnO_4- + 10Br^- + 16 H^+ \rightarrow2 Mn_2+ 5 Br_2 + 8 H_2O[/tex]

Thus, the coefficient of the permanganate ion of the MNO₄ - Br- → MN₂ + Br₂ is 2.

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