Name the following covalent bond Ch4

When they talk about items found, they refer to molecules. According to Avogadro, one mole of any substance, regardless of its type, contains the same amount of molecules equal to 6.022x10^23.

Now they tell us about a molecule of silver and a mole of calcium. In one mole of calcium, there will be 6.023x10^23 molecules, which is different from one molecule of silver, so the answer will be false

Answer:

a. 25.5 moles of Pb will be formed.

b. 54.8 moles of PbO are needed.

c. PbS is the limiting reactant.

Explanation:

1st) It is necessary to write the balanced chemical reaction:

From the balanced chemical reaction we know that 1 mole of PbS reacts with 2 moles of PbO to produce three moles of Pb and 1 mole of SO2.

2nd) Using the stoichiometry of the reaction and a mathematical rule of three, we can calculate the moles of Pb that will be produced from 17 moles of PbO and excess of PbS:

So, 25.5 moles of Pb will be formed.

3rd) Using the stoichiometry of the reaction and a mathematical rule of three, we can calculate the moles of PbO that are needed to make 27.4 moles of SO2 in excess of PbS:

So, 54.8 moles of PbO are needed.

4th) Using the stoichiometry of the reaction we can calculate the limiting reactant:

- Calculation from 17.6 moles of PbS:

From the stoichiometry of the reaction 1 mol of PbS reacts with 2 moles of PbO, so the 17.6 moles of PbS will need 35.2 moles of PbO to react properly, but we have 36g of PbO, so PbO will be the excess reactant and PbS the limiting reactant.

- Calculation from 36 moles of PbO:

We can do this calculation to confirm the previous one:

In this case, we can see that 36 moles of PbO will need 18 moles of PbS to react properly, but we only have 17.6 moles of PbS. Here we confirm that PbS is the limiting reactant.

        The difference between a kelvin (K), which is a division of the kelvin scale, and a degree on the Celsius scale is where zero is. The zero point on the Kelvin scale is at absolute zero, whereas the zero point on the Celsius scale is the freezing point of water. As a result, 0oK equals -273.15oC and 0oC equals 273.15 kelvins.

Answer : C.933.45K

         At 0 degrees Celsius, or 273 Kelvin, water freezes. Also, -273 degrees Celsius are the same as 0 Kelvin. Therefore, multiply the Celsius degree by 273 to convert it to Kelvin. And to convert from Kelvin to Celsius, just take 273 out.

Celsius to Kelvin conversion: Kelvin = Celsius + 273 1.5. The figure of 273 is also used instead of 273.15

Solution :

K = ° C + 273.15

K = 660.3 + 273.15

K = 933.45

Answer :660.3°C = 933.45k

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To solve this question, we need to look at the stoichiometric ratio between oxygen and SO₃, which in this case is 1:2

So 1 mole of O2 produces 2 moles of SO3.

Now we can use the rule of 3:

1 mole O2 --- 2 mole SO3

x mole O2 --- 8.46 moles SO3

2x = 1 x 8.46

x = 8.46/2

x = 4.23

Answer: 4.23 moles of O2

First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges .  it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.

Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

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Answer:

91.12 gram

Explanation:

Number of moles of Ammonia = 5.36

Molecular Mass of Ammonia = 14 + 3 × 1 = 17 gram/mol

Mass = Number of moles × Molecular mass

Mass = 5.36 mol × 17 gram/mol = 91.12 gram

Cocaine, amphetamines, caffeine, nicotine, and MDMA (ecstasy) have in common that they all increase the activity of the nervous system (Option a).

The expression stimulant drugs is used in biology and medicine to describe chemical substances that speed up the velocity in which messages are transmitted between nerve cells, which is common to caffeine, nicotine cocaine and ecstasy.

Therefore, with this data, we can see that stimulant drugs are able to increase the velocity in which messages are transmitted in the nervous system.

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By using the balanced reaction equation of ethane combustion, we can calculate that 12.8 L of carbon dioxide will be produced.

To calculate the answer to this, we need to write the balanced reaction equation:

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

Based on this, we can see that 2 moles of ethane produce 4 moles of carbon dioxide. Now, we need to calculate the number of moles (n) of ethane using its mass (m = 8.00 g) and its molar mass (M = 30.07 g/mol):

n = m/M

n = 8.00 g / 30.07 g/mol

n = 0.266 mol

Based on this, we can conclude that 2 * 0.266 mol = 0.532 mol of carbon dioxide was produced. Assuming that carbon dioxide acts as an ideal gas, we can use the ideal gas equation to calculate its volume:

PV = nRT ⇒ V = nRT/P

V - the volume of the gas

n - number of moles of gas (0.523 mol)

R - universal gas constant (0.08206 L*atm/K*mol)

T - temperature in Kelvins (25 °C = 298.15 K)

P - pressure (1.00 atm)

Now we plug all the known values into the equation:

V = 0.523 mol * 0.08206 L*atm/K*mol * 298.15 K / 1.00 atm

V = 12.8 L

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To determine the total number of elements in a chemical formula is being able to recognise the elements of the chemical formula.

An element is defined as the chemical substance that cannot further be divided by any chemical process into smaller particles.

A chemical formula is a representation for a chemical compound or molecules which contains one or more elements with the number of atoms attached as a subscript.

An example of a chemical formula is NaCl. This chemical formula contains one element of sodium (Na) and one element of chlorine (Cl).

In order to determine the total number of elements in a chemical formula, the elements should be recognised and the subscript attached to the element shows the number of atoms of the element found in that particular formula.

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Answer:

need the free questions srry yall

Explanation:

i don't know if you mean C° to F° but in F° the change would be 123.8°

According to the mole concept, there are 0.02 moles in 6.2 g of calcium phosphate.

According to mole concept,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.

In the given problem, number of moles is found out by, mass/molar mass

that is,6.2/310= 0.02 moles.

Hence, there are 0.02 moles in 6.2 g of calcium phosphate.

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Answer:

Useful

Explanation:

Index fossils are believed to be useful in correlating rock strata from widespread locations.▸ The collection of such fossils from different rock formations and layers enables the geologists to identify the layer of rock they were found in.

▸ They are also useful in dating and the study of geological formations which help scientists to get a clear understanding of the environment and the life forms that dwelt on the planet even hundreds of millions of years ago.

Have good day♡

A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.

Volcano is defined as a rupture in the part of the crust of the planetary mass of the object generally Earth, which allows the hot lava as well as ash, including the gases that has been escaped from the chamber of the magma.

Therefore, A volcano has recently irrupt it and wiped out most of the wildlife will leave it on the volcano and it will create huge impact on birds in the area going to be impacted as the volcano irrupt heat will generate and it will cause increase in the temperature that will change the life style of the various birds living in that area.

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The mass percent of the salt is 33.33%

The percentage of a solution's mass that is made up of solutes is known as the mass percent. This percentage is measured in relation to the total mass of the solution.

The term "mass percent composition" also refers to weight percentage. It is referred to as w/w%. The formula for mass percent in a solution is the mass of an element in one mole of the compound divided by the compound's molar mass, then multiplied by 100%.

Total mass of solution = 75g

The mass percent of the salt= 25/75×100%

The mass percent of the salt= 33.33%.

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Answer:

Zinc is more reactive than lead, iron and silver so, zinc reacts with hydrochloric acid to form Zn2+ ions.

Answer:

zn2+

Explanation:

the reason for this answer is that when hydrochloric acid and zinc come together they react to form a stronger ion

All are correct about two solutions of KCl and [tex] MgCl_{2}[/tex].

Both the compounds KCl and [tex] MgCl_{2}[/tex] are ionic compounds. So, they easily dissociate on contact water with constituent ions. KCl dissociates into one cation [tex] {K}^{+} [/tex] and one anion [tex] {Cl}^{-} [/tex]. [tex] MgCl_{2}[/tex] dissociates into one cation [tex] {Mg}^{2+} [/tex] and two anions [tex] {Cl}^{-} [/tex].

So, the KCl solution produces two ions while the [tex] MgCl_{2}[/tex] solution produces three ions. More number of ions means higher amount of charge can be carried at a time and hence higher conductivity will be seen. Likewise, less number of ions in the solution indicates less capacity to conduct electricity. Thus, [tex] MgCl_{2}[/tex] has higher amount of ions thus higher conductivity. Similarly, KCl has lesser amount of ions in the solution thus it has lower conductivity.

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The molar mass of the acid is  65 g/mol.

We know that the term neutralization is applied to the reaction between an ad and a base that produces salt and water only. In this case, we have been told that  a monoprotic weak acid required 22. 50 ml of 0. 510 m sodium hydroxide to titrate it.

Let us recall that by the principle of the stoichiometry of the chemical reactions, the reaction between sodium hydroxide and a monoprotic acid has to be one is to one and we have to bear this in mind.

Thus;

Number of moles of sodium hydroxide = 22. 50/1000 L *  0. 510  M

= 0.0115 moles

This implies that 0.0115 moles of the acid was required also.

Since;

Number of moles = mass/molar mass

Molar mass =  mass/Number of moles

Molar mass =  0. 75 g /0.0115 moles

= 65 g/mol

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20th century was expected to have the largest simulated temperature from the gas chromatography mass spectrometry.

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When aqueous lead (II) nitrate and aqueous potassium iodide are added to a dish containing water, diffusion occurs before the formation of yellow precipitate.

Diffusion is a process involving the movement of molecules to the region of lower concentration from the region of higher concentration.

When aqueous lead (II) nitrate and aqueous potassium iodide are added to a dish containing water, the compounds would dissociate into ions. Immediately after the dissociation, the ions would start to diffuse through the molecules of water to lower concentration.

After diffusion, the yellow compound lead iodide would form from the reaction between iodide ions in potassium iodide and lead ions from lead nitrate. The yellow compound would later precipitate out of the solution.

The reaction involved between the compound result in potassium nitrate and lead iodide

Lead nitrate (aq) + Potassium iodide (aq) → Lead iodide (yellow precipitate) + Potassium nitrate

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A synthesis reaction is a reaction in which two compounds come together to form one. In this case, if the product is lithium sulfide, the reactants will be lithium and sulfur. Lithium in its natural form is solid, and sulfur also has a solid-state. Lithium sulfide is also a solid compound. The synthesis reaction will be:

Now, we have to balance the equation. We have two atoms of Li on the products side and 1 atom of Li on the reactants side. So, we put the coefficient 2 in Li molecules.

Now, we have the balanced equation of the synthesis reaction of Lithium Sulfide

During cellular respiration, oxygen and glucose are converted into water and carbon dioxide. The procedure produces ATP, which is converted into energy, carbon dioxide, water, and other byproducts.

Oxygen might be either present or absent while organisms are respiring. However, the activity is essentially known as "cellular respiration" so because cell seems to "respire" by consuming molecular oxygen (as an electron acceptor) and exhaling carbon dioxide (as an end product).

The process by which glucose is broken down in the presence of oxygen in the mitochondria of animals (animals and plants) to release energy in the form of ATP is referred to as cellular respiration.

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Energy transfers between particles when they collide.

When the particles collide they vibrate and energy get transferred between the particles. The particles that made matter are in constant motion and have high kinetic energy. kinetic energy is equal to heat. Energy is the ability to do work. When energy moves from one place to another place we can say that energy is transferred . so in case of particle s, particles are in continuous motion and colloid with each other and when the particles collide with each other the energy transfer between particles takes place.

Thus, Energy transfers between particles when they collide.

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In this question, we have a situation where a gas is in constant pressure but changing its volume and temperature, and the best way to solve a situation like this, is through the Charles's gas law formula, which shows the relationship between volume and temperature when the pressure is constant. The formula is:

V1/T1 = V2/T2

We have:

V1 = 0.510 L

T1 = 19°C, but we need it in Kelvin, 292 K

V2 = ?

T2 = 6°C, or 279 K

Now we add these values into the formula:

0.510/292 = V2/279

0.00175 = V2/279

V2 = 0.488 Liters is the new volume

When monosaccharides are bonded together c) all of these are correct.

Monosaccharides can be described as sugars from which all other complex forms of sugars are formed. Monosaccharides are the simplest form of sugars the combination of which leads to the formation of disaccharides, polysaccharides and oligosaccharides.

When the monosaccharides join in order to form complex sugar molecules, a single molecule of water is lost by each new link or joining of molecules that occur.

As monosaccharides are simplest of sugars, they are more easily absorbed as compared to other types of sugars.

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The mass of water required to change the temperature of water from 25.0°C to 35.0°C when 4,000 joules of energy are released is 95.6g.

The mass of a substance in a calorimetry procedure can be calculated by using the following formula:

Q = mc∆T

Where;

According to this question, a sample of water is changed from 25.0°C to 35.0°C when 4,000 joules of energy are released. The mass of the water sample is as follows:

4000 = m × 4.184 × 10

4000 = 41.84m

m = 95.6g

Therefore, 95.6 grams is the mass of the water sample.

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Pendulum shows the path it takes as it swings back and forth and it is because of kinetic energy is converted into potential energy only once

Pendulum is the point mass suspended by the weightless and inextensible string fixed rigidly to support pendulum is also used in scientific instrument and it form because of gravity and in that pendulum potential energy is transformed to the kinetic energy and come back again and weight of pendulum is released and then it get active and gravity pull it back and that's why kinetic energy is converted into potential energy only once

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Prior to the industrial revolution, the previous highest level of CO2 concentration in the atmosphere over the prior 400,000 years was 300 ppm.

Before the Industrial revolution, the carbon dioxide concentration in the atmosphere was lesser as there was not much carbon dioxide waste that was produced. The highest level of carbon dioxide recorded in the air was 300 ppm at that time.

After the industrial revolution, the concentration of carbon dioxide increased. We can see the carbon dioxide concentrations to reach as high as 1.5 trillion tons today. This is because the formation of industries has been increasing since then which produces a lot of waste carbon dioxide.

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Answer:

Combination or Synthesis

Explanation:

It is a combination because 2 reactants are combining together to form the product.