The sphere was dropped into water in a graduated cylinder as shown below

Answer: The economic demands of Plan B were too high.

Explanation: During the selection of any action plan to maintain biodiversity, several factors must be considered. These factors include the cost of the plan, the estimated effectiveness of the plan at protecting the targeted populations, and how the plan will affect both humans and other populations in the area.

The chart shows that the approximate cost of implementing Plan A was $5 billion. The approximate cost of implementing Plan B was $30 billion. While Plan B might have been more effective at reducing habitat destruction, and thus maintaining biodiversity, state officials likely chose Plan A over Plan B because the economic demands of Plan B were too high.

Answer: The economic demands of Plan B were too high.

Explanation:

just did it

Answer:

nonpolar

Explanation:

A nonpolar solvent has the highest solubility with a nonpolar solute.

According to the forces of attraction, the most likely state of matter of the substance mentioned is liquid.

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.According to law of conservation of matter , matter can neither be created nor destroyed only its state changes .

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Answer:

liquid

Explanation: liquid conforms to the shape of the container which it is held in.

Benzene, known by its chemical formula, is a colorless, liquid, flammable organic compound. 

The reagents necessary to convert benzene into each of the following compounds.

A. To convert benzene to chlorobenzene, the reagents needed are Cl2 and AlCl3.

B. To convert benzene to nitrobenzene, the reagents needed are HNO3 and H2SO4.

C. To convert benzene to bromobenzene, the reagents needed are Br2 and AlBr3.

D. To convert benzene to ethylbenzene, the reagents needed are CH3CH2Cl and AlCl3.

E. To convert benzene to propylbenzene, the reagents needed are CH3CH2Cl and AlCl3.

F. To convert benzene to isopropylbenzene, the reagents needed are (CH3)2CHCl and AlCl3.

G. To convert benzene to aniline (aminobenzene), first convert it to nitrobenzene using HNO3 and H2SO4, then reduce it to aniline using Zn and HCl.

H. To convert benzene to benzoic acid, first convert it to toluene using CH3Cl and AlCl3, then oxidize it to benzoic acid using KMnO4, NaOH, and heat.

I. To convert benzene to toluene, the reagents needed are CH3Cl and AlCl3.

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When a powder is dissolved in water, it changes the temperature because the chemical reaction that occurs between the particles of the solute and the solvent when they mix. The heat energy that is released or absorbed when two particles come together is known as enthalpy of solution.

In order to understand the temperature change in detail, we need to look at the two types of enthalpies that are involved when a powder is dissolved in water.

The first type is called the lattice enthalpy which is the energy that is needed to break the bonds between the particles in the solid. The second type is the hydration enthalpy which is the energy that is released when the particles of the solute are surrounded by the solvent particles.

When a powder is dissolved in water, the lattice enthalpy is broken and the particles of the solute are dispersed throughout the solvent. This requires energy, so the temperature of the solution decreases. Then the solvent particles surround the particles of the solute and release energy, so the temperature of the solution increases. The overall temperature change depends on the difference between the lattice enthalpy and the hydration enthalpy.

When a powder is dissolved in water, it changes the temperature because of the chemical reaction that occurs between the particles of the solute and the solvent when they mix. When two particles come together, the heat energy that is released or absorbed is known as enthalpy of solution. There are two types of enthalpies involved when a powder is dissolved in water.

The first type is lattice enthalpy, which is the energy that is needed to break the bonds between the particles in the solid. The second type is hydration enthalpy, which is the energy that is released when the particles of the solute are surrounded by the solvent particles.

When a powder is dissolved in water, the lattice enthalpy is broken, and the particles of the solute are dispersed throughout the solvent. This requires energy, so the temperature of the solution decreases. Then, the solvent particles surround the particles of the solute and release energy, so the temperature of the solution increases. The overall temperature change depends on the difference between the lattice enthalpy and the hydration enthalpy.

If the lattice enthalpy is higher than the hydration enthalpy, the solution will be cold because more energy is required to break the bonds in the solid than is released when the particles are surrounded by solvent particles. Conversely, if the hydration enthalpy is higher than the lattice enthalpy, the solution will be hot because more energy is released when the particles are surrounded by solvent particles than is required to break the bonds in the solid.

When a powder is dissolved in water, the temperature of the solution changes because of the chemical reaction between the particles of the solute and the solvent when they mix. The overall temperature change depends on the difference between the lattice enthalpy and the hydration enthalpy. If the lattice enthalpy is higher than the hydration enthalpy, the solution will be cold, and if the hydration enthalpy is higher than the lattice enthalpy, the solution will be hot.

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The moles of C can be obtained by finding the moles of B and resorting to the stoichiometry of the reaction.

The question is incomplete but by the use of the stoichiometry of the reaction we can be able to obtain the number of moles of B and then use it to find the number of moles of C as required.

Stoichiometry is the calculation of the quantities of reactants and products in a chemical reaction. It involves using the balanced chemical equation to determine the relative amounts of each substance involved in the reaction.

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Answer

6.9 x 10¹²Hz

Explanation:

Given parameters:

Wavelength of the wave  = 4.35 x 10⁻⁵m

Unknown:

Frequency of the wave = ?

Solution:

The speed of a wave is related to the wavelength and frequency using the expression below;

          C  = Fλ

C is the speed of light = 3 x 10⁸m/s

F is the frequency

λ  is the wavelength

Insert the given parameters and solve;

      3 x 10⁸  = F x 4.35 x 10⁻⁵

         F  = \(\frac{3 x 10^{8} }{4.35 x 10^{-5} }\)   = 6.9 x 10¹²Hz

Answer:

Explanation:

Moles of Pb(NO3)2 =  mass/molecular mass

= 50.0 grams/(207.20*1 + 14.01*2 + 16*6)

= 50.0 grams/331.22

= 0.15 moles

Moles of NaI

= 30/(22.99+126.9)

= 30/149.89

= 0.2 Moles

A. NaI is less 2x Pb(NO3)2 so NaI is the limiting reagent.

B. The ratio is 1 to 2 so there is 0.15 - 0.2/2 = 0.05 mole

or 16.78 grams of Pb(NO3)2 left.

C. As NaI is limiting, only 0.2 Moles of NaNO3 is formed.

Mass =  Moles * Molecular Mass

Molecular Mass of NaNO3 can be calculated as:  

Na - 22.99

N - 14.01

O - 3(16) = 48

23+14+48 = 85gram / mole

Thus, Mass =  0.2*85  = 17 gram of NaNO3

Mass is conserved in a chemical reaction.

Mass of PbI2 can be calculated as:

50+30-16.78-17

= 46.3 gram of PbI2

Mass =  

12.75

Thus, 12.75g of Sodium Nitrate can be formed

Answer:

Explanation:

Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)

MM for each compound -

Pb(NO3): 207 + 14x2 + 16x3x2 = 331

PI2: 207 + 127x2 = 461

NaI: 23 + 127 = 150

NaNO3: 23 + 14 + 16x3 = 85

Moles of Pb(NO3)2 = 50/331 = 0.15

Moles of NaI = 30/150 = 0.2

Ratio of moles is 1:2

So NaI is limiting

Limited to 0.2/2 = 0.1 mole of Pb(NO3)2

Excess = 0.15 - 0.1 = 0.05 mole

Mass remains = 0.05x331 = 16.55 grams

Moles of NaNO3 formed = Moles of NaI reacted = 0.2

Mass = 0.2x85 = 17 grams

Moles of PbI2 formed = Moles of Pb(NO3)2 reacted = 0.1

Mass = 0.1x461 = 46.1 grams

If 12 grams of NaNO3 actually formed in the reaction,

percent yield = 12/17x100% = 70.6%

The view on ethics of war that maintains that limits in warfare are merely pragmatic or prudential and that the goal is strength and victory is known as Realism in the ethics of war.

Realism in the ethics of war argues that the primary objective of warfare is to achieve a position of strength and secure victory, regardless of the means employed. This perspective emphasizes the importance of national interest, power dynamics, and strategic calculations in determining the conduct of war. According to realists, ethical considerations such as moral principles or constraints are secondary to achieving military objectives. Realists contend that the pursuit of victory should take precedence over other ethical concerns, as success in war is crucial for maintaining one's own security and deterring potential adversaries. While acknowledging the existence of international laws and treaties, realists view them as tools for advancing national interests rather than as absolute moral imperatives.

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To solve this problem, we can use the Nernst equation:
Ecell = E°cell - (RT/nF)ln(Q)
Where E°cell is the standard cell potential, R is the gas constant, T is the temperature in Kelvin, n is the number of electrons transferred in the cell reaction, F is Faraday's constant, and Q is the reaction quotient.

For the given cell, the overall reaction is:
Mn(s) + 2 Pb2+(aq) -> Mn2+(aq) + 2 Pb(s)
The standard reduction potentials for the Mn/Mn2+ and Pb/Pb2+ half-cells are:
Mn2+(aq) + 2 e- -> Mn(s)      E° = -1.18 V
Pb2+(aq) + 2 e- -> Pb(s)      E° = -0.13 V
Using the reduction potentials, we can calculate the standard cell potential:
E°cell = E°(cathode) - E°(anode) = (-0.13 V) - (-1.18 V) = 1.05 V
Now we can plug in the given values into the Nernst equation:
0.44 V = 1.05 V - (0.0257 V/K)(ln(Q)/2)
Solving for ln(Q):
ln(Q) = -25.16
Taking the exponential of both sides:
Q = e^-25.16 = 3.49 x 10^-11
We can use the reaction quotient to find the concentrations of the ions at equilibrium:
Q = [Mn2+] [Pb2+]^2
Substituting [Mn2+] = 1.5 M and solving for [Pb2+]:
[Pb2+] = sqrt(Q/[Mn2+]) = sqrt((3.49 x 10^-11)/(1.5)) = 5.33 x 10^-6 M
Therefore, [Pb2+] = 5.33 x 10^-6 M (in scientific notation).

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4.605 g is the minimum mass of glycerol that must be dissolved to make a 0.020 molar solution.

The minimum mass of glycerol that must be dissolved to make a 0.020 molar solution, use the formula for molarity  

: molarity = moles of solute/liters of solution.

For  moles of solute, we have : n = m/M , where n is moles of solute, m is mass of solute in grams, and M is the molar mass of the solute.

Here, Molar concentration = 0.020 M; Volume = 2.5 L; Molar mass of glycerol = 92.1 g/mol

The minimum mass of glycerol required is

molarity = moles of solute/liters of solution.

We know that molarity = 0.020 M and liters of solution = 2.5 L. Therefore, moles of solute is -

molarity = moles of solute/liters of solution

0.020 M = moles of solute/2.5 L

moles of solute = 0.050 mol

Now ,

n = m/M -> m = n x M

here Moles of solute, n, 0.050 mol and the molar mass of glycerol, M, is 92.1 g/mol.

we get the minimum mass of glycerol required: m = n x M= 0.050 mol x 92.1 g/mol= 4.605 g

Therefore, 4.605 g is the minimum mass of glycerol that must be dissolved to make a 0.020 molar solution.

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Physical characteristics are characteristics that may be seen or measured without modifying the makeup of the substance.

Some examples are the freezing, melting, and boiling points as well as color, hardness, and fragrance. Without altering the makeup of the material, physical qualities can be seen or quantified. In order to observe and characterize matter, physical attributes are used. Density (the mass-to-volume ratio), color (interaction with visible light), odor (the appeal to the olfactory senses), hardness, and volume are a few examples of the physical characteristics of matter. Physical characteristics are those that can be seen or quantified without altering the makeup of the substance. They are employed to scrutinize and categorize stuff.

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Sodium hydroxide to a cylinder of aluminum nitrate to precipitate the aluminum hydroxide. Add more base to dissolve the precipitate.

The reaction can then be reversed by adding hydrochloric acid. Sodium hydroxide replaces copper forming copper hydroxide. Instead of dissolving the compound precipitates and appears as a light blue solid in the liquid. At this point, the solution becomes colorless and solid copper hydroxide settles to the bottom.

All ions dissolve in each other and do not react with each other. So the short answer to this question is nothing. When NaOH and KCl react KOH and NaCl are formed. Such reactions are called double displacement reactions. Silver ions come out of the solution as a brown precipitate of silver oxide in the presence of hydroxide ions.

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Answer:

Answer:

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

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

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 

 

 

 

3 3 4

2 4

2 5

4

3 3 4

2 4

2 5

4

(( ) )) 143 /

( ) 98 /

( ) 108 /

( ) 474.8 /

484.25 (( ) ) 3.39

143

75.46 ( ) 0,77

98

270 ( ) 2,5

108

546 ( ) 1,15

474,8

m

M

M NH PO g mol

M H SO g mol

M N O g mol

M SnF g mol

NH PO mol

H SO mol

N O mol

SnF mol

According to the mole concept, there are 0.77 moles in 75.46 g of sulfuric acid.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Number of moles is calculated as, mass/molar mass=75.46/98=0.77 moles.

Thus, there are 0.77 moles in 75.46 g of sulfuric acid.

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The number 0.005802 expressed in proper scientific notation is 5.802 x 10^-3

The charge of P in H₂P₂O₇⁻² is +5.

To find the charge of P in this compound, we can use the formula:

charge = (# of valence electrons) - (# of electrons assigned to atom in Lewis structure)

First, we need to determine the number of valence electrons for P. P is in group 5A on the periodic table, so it has 5 valence electrons.

Next, we need to determine the number of electrons assigned to P in the Lewis structure of H₂P₂O₇⁻².  Each P atom is bonded to 4 other atoms (2 O atoms and 2 H atoms), so it is assigned 4 electrons in the Lewis structure.

Using the formula, we can calculate the charge of P:

charge = (5) - (4) = +1

However, there are 2 P atoms in the compound, so the total charge of P is:

(+1) + (+1) = +2

Finally, we need to take into account the overall charge of the compound, which is -2. To find the charge of P, we can use the formula:

charge of P = (overall charge) - (charge of other atoms)

The charge of the other atoms (H and O) is:

(2)(+1) + (7)(-2) = -12

So the charge of P is:

(-2) - (-12) = +10

Since there are 2 P atoms, the charge of each P atom is:

(+10)/2 = +5

Therefore, the charge of P is 5, and the appropriate sign is "+".

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Our current understanding of the atom is based on Dalton's early 19th-century idea of atomism, which was developed from meteorological investigations. John Dalton was just a meteorologist, an expert on color blindness, and a teacher, but he will be most widely recognized for creating the idea of atomism.

A scientist is someone who meticulously gathers data and uses it to develop theories, test those hypotheses, and further knowledge and understanding. Despite the fact that the name "scientist" predates Aristotle by more than two millennia, he is frequently referred to as the first scientist. He invented the methods of reasoning, observation, inquiry, and demonstration in Greece in the fourth century BC.

Because they provide specialized explanations for how the world functions, scientists play a crucial role in society. Science is a powerful tool for survival, despite the fact that it doesn't always provide us with joy, and humans have spent considerable time starting to figure out how to do both.

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Answer:

States of matter

Explanation:

Three states of matter

The number of the NMR signals compound CH3OCH2CH(CH3)2 shows are:

A spectroscopic method for observing the local magnetic fields around atomic nuclei is nuclear magnetic resonance spectroscopy, sometimes referred to as magnetic resonance spectroscopy (MRS) or NMR spectroscopy.

This spectroscopy's foundation is the measurement of electromagnetic radiations' absorption in the radio frequency range between 4 and 900 MHz. Nuclear Magnetic Resonance Spectroscopy is the name given to the form of spectroscopy that is used to measure the absorption of radio waves in the presence of a magnetic field.

The sample is put in a magnetic field, and the nuclear magnetic resonance (NMR) signal is generated by radio waves excitation of the sample's nuclei, which is detected by sensitive radio receivers.

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The number of the NMR signals compound CH3OCH2CH(CH3)2 shows are:

3 H with singlet.
6 H with doublet.
1 H with muliplet.
2 H with doublet.

A spectroscopic method for observing the local magnetic fields around atomic nuclei is nuclear magnetic resonance spectroscopy, sometimes referred to as magnetic resonance spectroscopy (MRS) or NMR spectroscopy.

This spectroscopy's foundation is the measurement of electromagnetic radiations' absorption in the radio frequency range between 4 and 900 MHz. Nuclear Magnetic Resonance Spectroscopy is the name given to the form of spectroscopy that is used to measure the absorption of radio waves in the presence of a magnetic field.

The sample is put in a magnetic field, and the nuclear magnetic resonance (NMR) signal is generated by radio waves excitation of the sample's nuclei, which is detected by sensitive radio receivers.

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Answer: Radhika loves to eat sweets and chocolates. She asks her mother for the same before and after every meal. This is an example of bad eating habit.

Explanation:

Both sweets and chocolates contain high amount of fat and sugar. When Radhika is eating the same before and after every meal then it means she is consuming it in excess.

When we eat too much of sweets and chocolates then its remains get deposited in between our tooth and when they remain over there for hours then more amount of bacteria is formed.

Due to this bacteria our tooth starts to decay.

Hence, it is advised even by the doctors to eat sweets and chocolates occasionally and not regularly.  

Thus, we can conclude that Radhika loves to eat sweets and chocolates. She asks her mother for the same before and after every meal. This is an example of bad eating habit.

The heat capacity of the calorimeter when 5.0 g of C₈H₁₈ is burned in a bomb calorimeter with 750 g water, and there is a 10.0°C increase in temperature when 32.0 kJ of heat is absorbed is 62 J/°C.

The mass of C8H18 is 5g and is burnt in 750g of water the temperature rise is 10°C and the heat absorbed is 32kJ. To find the heat gained by water the following formula is used,      

q = mCp∆T          

On substituting the values from the question we get,

q = 750x4.184x10

q= 31380J

The calorimeter will however absorb the remaining energy. This is given by,

Heat capacity of Calorimeter = 32000J - 31380J

Heat capacity of the Calorimeter = 62J/°C.

Therefore, the heat capacity of the Calorimeter is 62J/°C.

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The combine mass of the sled and the rider, given that each dog pulled with a force of 30 N is 200 Kg

We know that force is related to mass and acceleration according to the following formula:

Force (F) = mass (m) × acceleration (a)

F = ma

With the above formula, we can determine the combined mass of the sled and rider. Details below.

From the question given above, the following data were obtained:

The combined mass can be obtained as follow:

Force = mass × acceleration

240 = mass × 1.2

Divide both sides by 1.2

Mass = 240 / 1.2

Mass = 200 Kg

Thus, the combine mass is 200 Kg

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The general formula for alkenes and alkynes are cnH2n and cnH2n-2, respectively.

Alkenes are hydrocarbons with a double bond made of carbon and carbon (C=C). Alkenes have the generic formula cnH2n, where "n" stands for the molecule's number of carbon atoms.

In an alkene, each carbon atom is joined to two hydrogen atoms, two other carbon atoms, and one oxygen atom.

For instance, ethene (commonly known as ethylene), which contains two carbon atoms, has the general formula C2H4.

Alkynes are hydrocarbons with a triple bond made of carbon and carbon. Alkynes have the generic formula cnH2n-2. Similar to alkenes, the letter "n" designates how many carbon atoms are present in the molecule. In an alkyne, each carbon atom is joined to one hydrogen atom and one additional carbon atom.

For instance, the usual formula for ethyne, which also goes by the name acetylene and includes two carbon atoms, is C2H2.

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Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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The latest estimate for the annual number of photos taken is 1.72 trillion.

People are taking more images all around the world, and Rise Above Research, a consulting organization that conducts market research for the digital imaging sector, predicts that the total number of photos taken worldwide will reach 1.5 trillion in 2022.

Around the world, 1.72 trillion images are taken annually, or 54,400 each second or 4.7 billion per day. Every year, around 2.3 trillion pictures will be taken by 2030. Photutorial research indicates that 1.2 trillion photos were shot globally in 2021. In 2022, the amount will rise to 1.72 trillion.

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The correct balanced chemical equation is FeCl₃(aq) + Na₂S(aq) → 3Fe₂S₃(s) + 3NaCl(aq)

To achieve a chemical equation's balance:

Fe₂S₃ (s) + NaCl (aq) FeCl₃ (aq) + Na₂2S (aq)

Let's start by balancing the atoms of iron (Fe). The iron atoms are already balanced, since there are two on the reactant side and two on the product side.

Let's now balance the atoms of sodium (Na). Two sodium atoms are present on the reactant side, hence two sodium atoms are required on the product side. By adding a coefficient of 2 in front of NaCl, we may do this:

Let's balance the sulfur (S) atoms lastly.

FeCl3(aq) + Na2S(aq) → 3Fe2S3(s) + 3NaCl(aq)

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The false statement is applied pressure only refers to atmospheric pressure and the correct option is option 1.

It is the ratio of the force applied to the surface area over which the force is applied. Pressure can be defined as the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Atmospheric pressure is the pressure exerted by the atmosphere on the earth.

Thus applied pressure not only represents atmospheric pressure.

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Answer:

B - Covalent bonds

Explanation:

Covalent bonds are a class of chemical bonds where valence electrons are shared between two atoms, typically two nonmetals. The formation of a covalent bond allows the nonmetals to obey the octet rule and thus become more stable.