How many grams are present in 2.5 moles of silicon

Answer:

option 3, the leaves higher up need less water since there getting more light and the ones lower need to adapt to gaining more water since they won't be seeing much light

The empitical formula shows the simplest ratio of elements in a compound (not the total number of atoms in the molecule).

So to find the empirical formula we need to calculate how many moles of each atom we have in this sample. Then we will see the ratio of each element.

We are given the mass, so to convert it to moles we use the molar mass. For this we go to the periodic table and see that the values for each element are:

Na (sodium): 22,99 g/mol

H (hydrogen): 1 g/mol

P (phosphorus): 25,81 g/mol

So we calculate the moles of each element as follows:

And as we see, for every 0.833 moles of Na we have the same number of moles of P, so the ratio of these elements in the molecule is 1 to 1.

As for the hydrogen:

So the ratio Na to H is 1 to 2.

Now we can write the empirical formula as follows=

Since each silicon atom shares its four outer electrons with another silicon atom, silicon has a massive covalent structure.

Giant Covalent Structures is its name. Solids with enormous covalent structures have very high melting points. Strong covalent connections connect each of the atoms, which must be disrupted in order to melt the material. Examples include silicon dioxide, graphite (a form of carbon), and diamond.

At normal temperature, giant covalent compounds are solids and have extremely high melting and boiling temperatures. Due to the strength of covalent bonds, melting and boiling these massive structures requires a lot of energy.

It has a large number of silicon and oxygen atoms. The structure of its atoms is connected throughout.

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Answer:

Generally the internal filling volume needs to be a higher volume level than the external volume level of the sample while the probe is submerged at all times.

Explanation:

Hope this helps you!

Answer:

D.

Explanation:        

The action of clearing a wide area of trees.

Answer:

magma, melting

Answer:

Moving Across a Period

Moving from left to right across a period, the atomic radius decreases. The nucleus of the atom gains protons moving from left to right, increasing the positive charge of the nucleus and increasing the attractive force of the nucleus upon the electrons

No, gamma radiation is only slightly deflected by magnets so it would still hit you if you were close to the magnets. That is option C.

Magnetic levitation which is also called magnetic suspension is defined as the phenomenon in which two magnetic objects are repelled from each other in a vertical direction.

Gamma radiation is defined as a type of electromagnetic wave with the highest energy and shortest wave length.

The gamma rays do not possess any charge and therefore are not affected by electric or magnetic fields.

Therefore, when gamma radiation is mistakenly emitted directly at you, passing through the magnets first, it will still hit you because the ray are only slightly deflected by magnets.

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Answer:

The volume of NO is 22.4L at STP

Explanation:

Based on the reaction:

2NH3 + 5/2O2 → 2NO + 3H2O

2 moles of NH3 react with 5/2 moles of O2 to produce 2 moles of NO.

To solve this question, we need to find the moles of each reactant in order to find the limiting reactant as follows:

Moles NH3 -Molar mass: -17.01g/mol-

Using PV = nRT

PV/RT = n

Where P is pressure = 1atm at STP

V is volume = 22.4L

R is gas constant = 0.082atmL/molK

T is absolute temperature = 273.15K

1atm*22.4L/0.082atmL/molK*273.15K = n

n = 1.00 moles of NH3

For a complete reaction of 1.00 moles of NH3 are needed:

1.00 moles NH3 * (5/2moles O2 / 2moles NH3) = 1.25 moles of O2

As there are 1.406 moles of O2, the limiting reactant is NH3

The moles of NO produced are the same than moles of NH3 because 2 moles of NH3 produce 2 moles of NO. The moles of NO are 1.00 moles

And as 1.00moles of gas are 22.4L at STP:

The work done by the cell at 298K if there are 2 moles of 2+ at the cathode and 2 moles of 2+ at the anode is 1273800J

E=E∘−(0.0592/n) log [R]/[P]

Here it is given that the temperature is 298 k where two moles of 2 + cathode and two moles of 2 + at anode the potential it is given that 1.10.

So from here here applying the formula Nernst equation and here we already know the value is 1.1 0 so we can directly apply that in the equation work done or maximum work done is equal to nEF were, F is the Faraday current E is the potential. so by doing the calculation we get the energy​

Work done= nEF

W = 2x1.10x96500

W =1273800J

Therefore, the work done by the cell is 1273800J

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1273800 J  work can a cell do at 298 K if there are 2 mols of 2+ at the cathode and 2 mols of 2+ at the anode

Here,we have given the data

temperature is 298 K, and that there are two moles of 2 + at the cathode and one mole of 2 + at the anode,

we can simply use the formula work done

work Max is equal to nEF in the Nerst equation where F is the Faraday current and E is the potential from here because we already know the value is 1.1 0.

Thus, by solving the math, we are able to determine the energy

Work done=nEF

W=2x1.10x96500

W=1273800 J.

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Answer:B

Explanation:

A positively charged object attracts an uncharged object.

A positively charged object attracts an uncharged object statement is in correct in the table. Hence option B is correct.

Charge are defined as a subatomic particle's ability to experience force when exposed to an electric and magnetic field. The value that the atom reaches after removing or gaining electrons is known as charge. Only ions that comply with the octat rule are stable. Atoms or groups of atoms with an electric charge are referred to as ions. Cations are positive-charged ion particles. Anions are ion types that have a net negative charge.

A charged object will cause an opposing charge to be applied to an uncharged object when it is brought close to the charged one. These two things are drawn to one another because opposing charges attract one another. Other charged items are drawn to a charged object whereas uncharged objects are repelled by it.

Thus, a positively charged object attracts an uncharged object statement is in correct in the table. Hence option B is correct.

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The Ksp for CoS, whose molar solubility of is 5.0 x 10^-22 mol L-1 in pure water, is 2.5 x 10^-43.

To calculate the Ksp (solubility product constant) for CoS (cobalt sulfide) using its molar solubility:

1. Write the balanced chemical equation for the dissolution of CoS:
CoS (s) ⇌ Co²⁺ (aq) + S²⁻ (aq)

2. Given the molar solubility of CoS is 5.0 x 10^-22 mol L⁻¹, this means that the concentrations of Co²⁺ and S²⁻ ions in the solution are also 5.0 x 10^-22 mol L⁻¹.

3. Use the Ksp expression, which is the product of the concentrations of the ions raised to the power of their coefficients:
Ksp = [Co²⁺] x [S²⁻]

4. Substitute the concentrations of Co²⁺ and S²⁻ ions into the Ksp expression:
Ksp = (5.0 x 10^-22) x (5.0 x 10^-22)

5. Calculate the Ksp value:
Ksp = 2.5 x 10^-43

The Ksp for CoS is 2.5 x 10^-43.

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Answer:

Answer B

It makes basic knowledge easier to learn.

Explanation:

Assessing students’ prior knowledge allows an instructor to focus and adapt their teaching plan. For students, it helps them to construct connections between old and new knowledge.

The gas molecules move between the system and the surroundings follow PV=nRT.

The smallest particle of a substance has all of the physical and chemical properties of that substance.

An increase in pressure pushes the molecules closer together, reducing the volume. If the pressure is decreased, the gases are free to move about in a larger volume.

In the kinetic theory of gasses, increasing the temperature of a gas increases in average kinetic energy of the molecules, causing increased motion.

The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.

At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas. At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.

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Answer:

Number 4

Explanation:

There are more in the line

The answer is option

The reaction:

is a Synthesis reaction, because from 2 different substances it is produced

Answer:

CO2

Explanation:

You have 3 C for 6 O, then the empirical will be 1 C for 2 O

=> CO2

One molecule of glucose contains 6 atoms. Compounds are stable when the atoms involved have an entire outermost electron shell.

What causes atoms to become charged when an ionic bond is formed?

Atoms become charged when an ionic bond is formed due to the transfer of electrons from one extent to another. This constructs a positive ion known as a cation and a negative ion known as an anion that is attracted to each other and forms an ionic bond.

The columns that are vertical in the periodic table are called groups or families.

Where are non-metals located on the periodic table?

Non-metals are typically located on the right side of the periodic table.

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1. Ammonia is a colorless gas with a chemical formula of NH3, when it comes in contact with water, it will be transformed into Ammonium ion and it will produce one hydroxide ion, and this is why Ammonia will present a more basic (pH) behavior, the reaction that represents this behavior is:

NH3 + H2O -> NH4+ + OH-

Number 4 is the only one that represents it well

Number 3 has the same reaction but since there is a plus sign instead of an arrow, I consider it wrong.

Answer:

Sc3F3

I hope its help for you

(a) To get the pH of the media to 5.8, you would add NaOH solution. NaOH is used as a basic solution, and when it is added to a solution, it will increase the pH of the solution.

(b) The molecular weight of BA is 225.3. To prepare a 1M solution, you would have to weigh out 225.3 grams of BA.(c) To convert a 1M solution of BA to mg/mL, you can use the following equation: 1 mole = molecular weight in grams; 1000 millimoles = 1 mole. So, 1 M = 1000 mg/mL. Therefore, a 1M solution of BA is equivalent to 1000 mg/mL .(d) To convert a concentration of 1000 mg/mL .

Therefore, to calculate the weight required for a 5 mM solution, use the following formula :Mass of BA = molarity × volume × molecular weight= 5 × 0.001 × 225.3= 1.1265 grams(f) To convert a concentration of 5 mM to mg/mL, we use the following formula: Concentration (mg/mL) = (Concentration (mM) × Molecular weight) / 1000= (5 × 225.3) / 1000= 1.1265 mg/mL(g)

To convert a concentration of 1.1265 mg/mL to mg/L, we multiply by 1000, so 1.1265 mg/mL = 1126.5 mg/L.(h) Given that the stock solution of BA is 5 mM and the working solution is 0.2 mg/mL.

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The ion at the center of a silicon-oxygen tetrahedron is sorrounded by four oxygen ions.

Silicate minerals are built around a molecular ion called the silicon-oxygen tetrahedron. These are generally called the rock-forming minerals. The silicon-oxygen tetrahedron (SiO4) consists of a single silicon atom at the center and four oxygen atoms located at the four corners of the tetrahedron. Each oxygen ion has a -2 charge and the silicon ion has a +4 charge. In the silicon- oxygen  tetrahedron, the silicon ion shares one of its four valence electrons with each of the four oxygen ions in a covalent bond to create a symmetrical geometric four-sided pyramid figure.

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Answer: I believe you may have meant "ionization energy?" Yes, for a neutral element this is a measure of the energy required to remove a valence electron.

Explanation: See above.

By definition, The energy required for the complete removal of 1 mol of electrons from 1 mole of gaseous atoms or ions is called Ionization energy. For a neutral element this energy is a measure of how easily the element forms an ion with a charge.

The electrons are attracted to the nucleus and it is necessary to provide energy to start them.

Ionization energy is the energy required to remove an electron from a gaseous atom, isolated and in a ground state. The electrons in the last shell, which are the weakest attracted to the nucleus, are always lost. In this way the neutral atom becomes a gaseous cation (positively charged ion).

The further away the electron is from the nucleus, the easier it is to remove it, that is, the less energy is needed.

Finally:

The energy required for the complete removal of 1 mol of electrons from 1 mole of gaseous atoms or ions is called Ionization energy. For a neutral element this energy is a measure of how easily the element forms an ion with a charge.

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The value of the Ksp for the bismuth sulphide (Bi₂S₃) and which has the solubility of 1.0 × 10⁻¹⁵ mol/L at 25 °C is 1.1 × 10⁷³.

The chemical equation is :

Bi₂S₃   ⇄  2Bi³⁺   +  3S²⁻

The expression for the ksp is as follows :

ksp = [Bi³⁺]² [S²⁻]³

The solubility = 1.0 × 10⁻¹⁵ mol/L

[Bi³⁺] = 2 ( 1.0 × 10⁻¹⁵ ) = 2 × 10⁻¹⁵

[S²⁻] = 3 ( 1.0 × 10⁻¹⁵ ) = 3 × 10⁻¹⁵

ksp = (2 × 10⁻¹⁵ )² ( 3 × 10⁻¹⁵ )³

ksp = 1.1 × 10⁷³

Thus, the ksp for the Bi₂S₃   is  1.1 × 10⁷³.

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Answer:

E

Explanation:

The heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.

The amount of heat required to increase the temperature of one gram of a material by one degree Celsius (°C) is defined as specific heat.

The equation q = mcΔt can be used to compute the amount of heat acquired or lost by a specific heat (q), where m is the mass of the sample, c is the specific heat, and Δt is the temperature change.

Given:

m = 8.75

c = 4.186 J/g°C

The melting point and boiling point of water is 0° and 100° respectively.

Δt = 100° - 0° = 100°

We know that,

q = mcΔt

  = 8.75(4.186)100

  = 3.662 kJ

Thus, the heat required to raise the temperature of 8.75 g of water from its melting point to its boiling points is 3.662 kJ.

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After 20 minutes, there would be 0.75 kilograms of salt in the tank.

1. Let's derive the differential equation that y(t) satisfies. The rate at which salt is added to the tank is given by the concentration of the solution (0.5 kg/L) multiplied by the rate at which the solution is added (6 L/min). The rate at which salt is drained from the tank is given by the concentration of salt in the tank (y(t) kg/L) multiplied by the rate at which the solution is drained (4 L/min). Therefore, the differential equation is:

dy/dt = (0.5 kg/L * 6 L/min) - (y(t) kg/L * 4 L/min)

Simplifying further, we have:

dy/dt = 3 - 4y(t)

2. To find the amount of salt in the tank after 20 minutes, we can solve the differential equation. One approach is to find the particular solution by assuming y(t) takes the form of a constant, y. Substituting this into the differential equation, we have:

dy/dt = 3 - 4y

Setting dy/dt to zero (since y is constant), we can solve for y:

0 = 3 - 4y

4y = 3

y = 3/4

y = 0.75 kg

Therefore, after 20 minutes, there would be 0.75 kilograms of salt in the tank.

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The pressure calculated as the difference between the net hydrostatic pressure and the net colloid osmotic pressure is known as: filtration pressure.

Pressure can be defined as a measure of the force exerted per unit area of an object or body. Thus, it is usually measured in Newton per meter square.

In Science, there are different types of pressure and these include the following:

Filtration pressure is a pressure that is typically calculated as the difference between the net hydrostatic pressure and the net colloid osmotic pressure. Also, it promotes the filtration of fluid through a membrane.

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