Please solve the question.

Answer:

See below

Explanation:

The equation shows    Al / Cl  = 2/3      or    3/2 Al = Cl

                                                                        3/2(20) = 30 Cl atoms needed

The equation shows a one-to-one relationship between Al and AlCl3

   produced     so if you use 20 Al atoms you get 20 AlCl3 molecules

The number of Cl₂ molecules needed to react with 20 aluminum atoms is approximately 11.97, and the number of units of aluminum chloride (AlCl₃) produced from 20 aluminum atoms is approximately 9.98.

Let's first calculate the number of molecules of chlorine gas (Cl₂) needed to react with 20 aluminum (Al) atoms:

From the balanced chemical equation: 2Al + 3Cl₂ ⟶ 2AlCl₃

The stoichiometric ratio between aluminum and chlorine gas is 2:3. This means for every 2 moles of aluminum, we need 3 moles of chlorine gas.

1 mole of any substance contains Avogadro's number (6.022 × 10²³) of particles (atoms, molecules, or ions).

Number of moles of aluminum (Al) atoms = 20 atoms / Avogadro's number

Number of moles of aluminum (Al) atoms = 20 / 6.022 × 10²³

Now, to find the number of molecules of chlorine gas (Cl₂) needed, we use the stoichiometric ratio:

Number of moles of chlorine gas (Cl₂) needed = (3/2) × Number of moles of aluminum (Al) atoms

Number of moles of chlorine gas (Cl₂) needed = (3/2) × (20 / 6.022 × 10²³)

Number of moles of chlorine gas (Cl₂) needed ≈ 1.988 × 10⁻²³ moles

Since 1 mole of any substance contains Avogadro's number of molecules, the number of molecules of chlorine gas (Cl₂) needed will be approximately:

Number of Cl₂ molecules ≈ 1.988 × 10⁻²³ × 6.022 × 10²³ ≈ 11.97

Now, let's calculate the number of units of aluminum chloride (AlCl₃) that can be produced from 20 aluminum (Al) atoms:

From the balanced chemical equation: 2Al + 3Cl₂ ⟶ 2AlCl₃

The stoichiometric ratio between aluminum and aluminum chloride (AlCl₃) is 2:2. This means for every 2 moles of aluminum, we get 2 moles of aluminum chloride.

Number of moles of aluminum chloride (AlCl₃) produced = Number of moles of aluminum (Al) atoms / 2

Number of moles of aluminum chloride (AlCl₃) produced = 20 / 2 / Avogadro's number

Number of moles of aluminum chloride (AlCl₃) produced ≈ 20 / (2 × 6.022 × 10²³)

Number of moles of aluminum chloride (AlCl₃) produced ≈ 1.658 × 10⁻²³ moles

Since 1 mole of any substance contains Avogadro's number of units (molecules or formula units), the number of units of aluminum chloride (AlCl₃) produced will be approximately:

Number of AlCl₃ units ≈ 1.658 × 10⁻²³ × 6.022 × 10²³ ≈ 9.98

Therefore, the number of Cl₂ molecules needed to react with 20 aluminum atoms is approximately 11.97, and the number of units of aluminum chloride (AlCl₃) produced from 20 aluminum atoms is approximately 9.98.

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Answer:  D) If the reaction occurs in the gas phase

Explanation:

An electrochemical cell can generate or use electrical energy. The mass of solid chromium that will be deposited on the electrochemical plate is 7.17 gm.

Current in an electrochemical cell is the ratio of the quantity of electricity in columns and time in seconds.

Given,

Current (I) = 0.350 A

Time = 21.7 hours

Molar mass of chromium = 52.0 g/mol

First time is converted into seconds:

1 hour = 3600 seconds

21.7 hours = 76020 seconds

The quantity of electricity flowing in the electrochemical solution is calculated as:

[tex]\begin{aligned} \rm Q & = \rm It\\\\& = 0.350 \times 76020 \\\\& = 26607\;\rm C \end{aligned}[/tex]

Electricity required for depositing 1 mole or 52.0 g chromium is calculated as:

In electrochemical solution, chromium chloride is dissociated as:

[tex]\rm CrCl_{2} \rightarrow Cr^{2+} + 2 Cl^{-} \\\\\rm Cr^{2+} +2 e^{-} \rightarrow Cr[/tex]

Two moles of electrons are needed to deposit 52.0 g of chromium.

If, 1 electron = 96500 C

Then, 2 electron = 193000 C

The mass of chromium deposited is calculated as:

193000 C = 52 g chromium

So, 26607 C = [tex]\dfrac{26607 \times 52}{193000} = 7.17 \;\rm gm[/tex]

Therefore, 7.17 gm of chromium is produced.

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Answer:The more air we pump into them the more squished the air has to become to fit inside the ball. As the air becomes more squished, it pushes more on the inside of the ball. When you have a ball which is more inflated, there is more force pushing on the inside of that ball. (We call that air pressure).

Explanation:

The amount of gas causes the change in pressure when a basketball is pumped up. The force delivered perpendicularly to an object's surface per unit area across where that force is dispersed is known as pressure.

The force delivered perpendicularly to an object's surface per unit area across where that force is dispersed is known as pressure (symbol: p / P). The pressure proportional to the surrounding air is known as gauge pressure, also spelt gauge pressure[a].

Pressure is expressed using a variety of units. Some of them come from dividing a unit of force by a measure of area; the pound-force / square inch and the newton every square metre (N/m2) are two examples. The standard international measurement of pressure, a pascal (Pa), is another. The amount of gas causes the change in pressure when a basketball is pumped up.

Therefore, the amount of gas causes the change in pressure when a basketball is pumped up.

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Answer:

throughout the metallic structure allowing the atoms to slide past each other. This sliding is why metals are ductile and malleable. Ionic compound must break bonds to slide past one another, which causes the ionic material to split and crack.

Explanation:

Hope this helps loves mark me brianlest x

Answer:

The chemical equation when Hexane is subjected to strong heat in the absence of air

Answer:

The sand is much warmer than the water because water has a higher specific heat, or it takes more energy to change the temperature of water. Since they are absorbing energy from the same place, the sun, the sand will get warmer faster because it takes less energy to change the temperature.

Another reason could be because the water is constantly mixing with the water below it which is not exposed to the sun and because of this the water remains at a lower temperatre. The sand however has the same part exposed to the sun unless an external force, a foot, umbrella, wind, etc comes to move it. So it is able to absorb the sun for longer than the water.

A good example of equilibrium would be the mixing of oil and water in a closed container.

Chemical equilibrium is a condition in which the concentrations of components of a chemical reaction remain unchanged and have no tendency to change.

Of all the options, the only one where the concentrations of the component reactants cannot change is a mixture containing oil and water in a closed container.

Oil and water are immiscible and thus, their concentrations remain constant.

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Answer:

Hello the answer for the volcanos is here below:

7. Pipe

8. Crater

9. Vent

10. lava flow

11. magma chamber

Hope this helps :)

Answer:

12.125 moles of Z

Explanation:

Hi! Here, since you only know the number of moles for one of the reactants, you will use the coefficients in the reaction to use the mole ratio to find your answer. Since the question states that there are 4.85 mol A and excess B, A is your limiting reactant. This means that once all of the A is used up in the reaction, you will have your maximum amount of Z left behind because there will only be B left and no A to make more Z.

The mole ratio of A:Z is 2:5, found from the coefficients in the chemical equation(2 moles of A for every 5 moles of Z).

So, start with the information that is given to you (4.85 mol A) and then use the mole ratio, like this:

4.85 mol A([tex]\frac{5 mol Z}{2 mol A}[/tex])

This way, the mol A will cancel out, leaving behind mol Z (always put the unit you are looking for on top).

Doing this leads to mol Z = 12.125 mol.

I hope this helps! Good luck with your finals!

As per the given 4.85 moles of A will produce 12.125 moles of Z, assuming excess B.

A chemical reaction is the transformation of one or more substances, known as reactants, into one or more different substances, known as products.

Chemical reactions involve the breaking and forming of chemical bonds between atoms and molecules, causing atoms to rearrange and the chemical and physical properties of the substances involved to change.

From the balanced chemical equation, we can see that 2 moles of A react with 3 moles of B to produce 5 moles of Z.

So the mole ratio of A to Z is 2:5.

Therefore, if 2 moles of A react to produce 5 moles of Z, then 4.85 moles of A will produce:

(4.85 mol A) x (5 mol Z / 2 mol A) = 12.125 mol Z

Thus, 4.85 moles of A will produce 12.125 moles of Z, assuming excess B.

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Answer:

B.) an elephant having the same trunk sizes and shapes as its parents

Explanation:

an inherited trait is genetically determined. inherited traits are coded in our DNA and hence can be passed on to the next generation.

The products obtained from the reaction between HCl and NaOH are NaCl and H₂O

Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.

The reactants are located on the left side while the products are located on the right side.

Reactants —> Products

The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

The reaction between HCl and NaOH is a neutralization reaction which produces salt and water as shown below

HCl + NaOH → NaCl + H₂O

Products => NaCl and H₂O

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hydrogen chloride(hydrogen, and chlorine

Explanation:

.

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Answer:

the ice cream falls down..therefore, it's kinetic energy while the melting part is heat energy

If the pH of the acid at a given time is found to be 1.25, then the molarity  of the gastric acid juice is 0.056M.

pH is define as the negative logarithm of the concentration of H⁺ ions present in any solution and it will be represented as:

pH = -log[H⁺]

Concentration will be present in the form of molarity and pH value for gastric acid is given 1.25 means it is strong acid as it completely dissociates into their ions.

Required equation for calculation will be:

[H⁺] = [tex]10^{-pH}[/tex]

[H⁺] = [tex]10^{-1.25}[/tex]

[H⁺] = 0.056 M

Hence molarity of the gastric acid juice is 0.056M.

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Answer:

Answer is d, strength of London forces increases with molecular size.

Explanation:

Dispersion forces are the forces preesnt between all intermingling atoms, molecules and particles. Dispersion forces are the weakest intermolecular force, but they build up with the addition of more atoms, molecules or particles. Heat of vapourisation or boiling point is dependant on the energy required to break the bonds within the molecule/hydrocarbon in question. The build up of dispersion forces create greater intermolecular forces, which make the boiling of a substance more difficult. Hence increased hydrocarbon chain length, and the related increased eat of vapourisation is due to how the strength of the London/Dispersion forces increases with molecular size

Answer:

what is this i dont know what kind of math this is

Answer: movement of Tectonic plates

Explanation: The tectonic plates are moving apart, on to the west and one to the east. As the plates move apart, volcanoes erupt and rift valleys are filled. During these events, earthquakes are common and magma rises up, creating a new oceanic crust.  

The statement that our energy supply is running out is false in accordance with the law of conservation of energy.

The law of conservation of energy states that the energy possessed by an object or physical body can neither be created nor destroyed, but it can only be transformed from one form of energy to another.

This ultimately implies that, we cannot run out of energy supply because the energy we generate from any source can't be destroyed in accordance with the law of conservation of energy.

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Answer:

C.They are only magnetic if an electric current is running through them

Explanation:

Electromagnets are conductors which develop a magnetic field due to the electrons flowing through them. If the flow of electric current stops, the motion of the electrons stop and they do not generate their magnetic fields.

A light can be treated like a particle because light comes in chunks of energy called photons.

Photons are the small packets of energy and its energy will be represented by the following equation as:

E = hυ, where

h = plank's constant

υ = frequency

Light will be treated like a wave as well as of particle due to presence of this type of energy.

Hence correct statement is light comes in chunks of energy called photons.

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Answer:

B. Light comes in chunks of energy called photons.

Answer:

the awnser is d the other fuel produce more pollutants

Explanation:

because right out the bat we know that other  fuels produce more than a 15 percent fuel so the right awnser is d

The minimum number of calories needed to change 40 g of water at 100°C to steam is 21600 calories

The heat needed to vaporise the water at 100 °C can be obtained as follow:

Q = m × ΔHv

Q = 40 × 540

Q = 21600 calories

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Answer:

In the total entropy of an isolated system, the thermal energy per unit temperature that is unavailable for doing useful work can never decrease.

Answer:

you work out the moles by finding the grand formula mass them you divide the actual mass by the grand formula mass: 25/160 (my grand formula mass is probably slightly different from yours) which I got 0.15625 then I times it by 32(O2) and I got 5. but my periodic table is different. it's whole numbers. ;-)

Explanation:

4.44