given sample of a xenon fluoride compound contains molecules of the type XeFn, where n is some whole number. Given that molecules of XeFn weigh 2.36 g, determine the value for n in the formula.

Answer:

\(from \: avogadros \: hypothesis \\ 1 \: mole \: of \: nitrogen \: reacts \: with \: 3 \: moles \: of \: hydrogen \\ 3 \: litres \: of \: nitrogen \: react \: with \: ( \frac{3 \times 3}{1} ) \\ 9 \: litres \: of \: hydrogen\)

C. Electrons fill orbitals in order of increasing orbital energy.

There are 9.03 x 10^23 chloride ions in 1.50 mol of aluminum chloride.

To determine the number of chloride ions in 1.50 mol of aluminum chloride, we need to consider the stoichiometry of the compound. Aluminum chloride has the formula AlCl3, which means it contains three chloride ions for every one molecule of aluminum chloride.

Since 1 mol of aluminum chloride contains 3 moles of chloride ions (according to the stoichiometry), we can calculate the number of chloride ions in 1.50 mol of aluminum chloride by multiplying the number of moles by Avogadro's number (6.022 x 10^23 ions/mol).

(1.50 mol AlCl3) x (3 mol Cl^-/1 mol AlCl3) x (6.022 x 10^23 ions/mol) = 9.03 x 10^23 chloride ions.

Therefore, there are 9.03 x 10^23 chloride ions in 1.50 mol of aluminum chloride.

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ANSWER

The addition of HCl will shift to reactants

EXPLANATION

When some strong acid is added to a buffer, the equilibrium is shifted to the left, and the hydrogen ion concentration increases by less than expected for the amount of strong acid added. Buffer solution helps in adjusting the pH of a substance.

Since the HCl is a strong acid, it will shift to the left (reactant sides)

Answer:

Rate = K[NH4+][NO2–]

Explanation:

Hello there!

In this case, since rate laws include the concentration of the species contributing to the rate of a chemical reaction; this question asserts this reaction is proportional to the concentration of ammonium (NH4+) and the concentration of nitrogen dioxide (NO2–); therefore, the rate law must contain the concentration of both reactants, for that reason, the answer would be Rate = K[NH4+][NO2–] as it contains the concentration of the aforementioned species.

Regards!

Molecular formular for C3H8O ( Isopropyl alcohol)

comprises of 3 Carbon, 8 Hydrogen and 1 oxygen ,

So, first box =3

second box = 8

third box = 1

emperical mass c3h80 =( 3*12) + (1*1) + (1*15.99) = 53.03 g/mole

Molecular formular = molecular weight / emperical mass

= 60.10g/mole /53.03g/mole = 1.133

if we multiply subscripts numbers ; we still get

Molecular formula = C3H8O

However, the second option doesnt have the option of 8 hydrogen .

While the circular portion of this solar eclipse is not visible in Quito, a partial solar eclipse can be seen there.

A partial eclipse happens when the Sun and Moon are only partly blocked from Earth's view by the Moon. Typically, a sizable portion of the planet's surface outside of an annular or complete eclipse can observe this occurrence.

However, because the umbra travels above the polar areas of the Earth and never touches the Earth's surface, some eclipses can only be seen as partial eclipses. Since it requires well over 90% coverage to observe any dimming of the Sun's brightness, partial eclipses are essentially undetectable. It wouldn't be any dimmer than civil dusk even at 99%.

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Answer:it B,

Explanation: you make two liquids react together. Energy is being given off because light is emitted. The electrons of the liquids must be losing energy in order to produce light.

the final volume of air in the balloon  when the balloon is taken to a depth of 10ft in a swimming pool, where the pressure is 981 torr is 10.8 L. Answer: d) 10.8 L.

We are given the initial volume of air in the balloon, Vi = 14.0 L. The initial pressure, Pi = 760 torr. The final pressure, Pf = 981 torr. The depth of the swimming pool, h = 10 ft. The temperature of the air, T is constant, which means that the gas in the balloon is an ideal gas.

We can use Boyle's law and the pressure difference to find the final volume of air.Boyle's law states that at a constant temperature, the volume of a gas is inversely proportional to its pressure. That is,V_1/P_1 = V_2/P_2where V1 and P1 are the initial volume and pressure, and V2 and P2 are the final volume and pressure.

Rearranging this equation, we getV_2 = V_1 × P_1/P_2= 14.0 L × (760 torr)/(981 torr)= 10.8 L

Therefore, the final volume of air in the balloon is 10.8 L. Answer: d) 10.8 L.

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Answer:

The law of constant proportion states that the percentage of each compound will stay constant regardless of the source size.

In other words, since 11.19% + 88.81% = 100%, in a 100 gram sample, these percentages will stay the same. In this case, 100% is "equal" to 100 grams.

So, 11.19 grams hydrogen and 88.81 grams oxygen will be present in a 100 gram sample of pure water.

Answer:

The vinegar is not enough to neutralize the pool.

Explanation:

The [OH⁻] in the pool is 1.0x10⁻¹mol / L. To know how many moles of OH⁻ are in the solution, you must calculate volume of the pool thus:

V(pool) = πr²h

Where radius is d/2 = 12m/2 = 6m

and h is deep of the pool = 10m

V(pool) = π(6m)²*10

V(pool) = 1131m³

As 1m³ = 1000L:

1131000L in the pool. And moles of OH⁻ are:

1.0x10⁻¹mol / L ₓ 1131000L = 131100 moles of OH⁻ are in the pool

The neutralization of OH⁻ with H⁺ is:

OH⁻ + H⁺ → H₂O

To neutralize the pool you must add 131100 moles of H⁺.

The H⁺ concentration in a vinegar pH = 2 is:

pH = -log [H⁺]

2 = -log [H⁺]

1x10⁻²M = [H⁺]

4L are just 4x10⁻² moles of [H⁺]. That means:

Answer:

Rate cup 1: 36.00 tsp/h.

Rate cup 2: 59.50 tsp/h.

Rate cup 3: 70.13 tsp/h.

Explanation:

Based on the given example, the units must be in tsp/hour. To do this we just have to divide tsp by seconds and then convert it to hours remembering that 1 hour equals 3600 seconds.

Let's calculate each case:

- Cup 1: 1 tsp, 1 minute 40 seconds. Remember that 1 minute equals 60 seconds, so 1 minute and 40 seconds equals 100 seconds. The calculation of the rate will look like this:

The rate of cup 1 is 36.00 tsp/h.

- Cup 2: 2 tsp, 2 minutes 1 second. As we saw before 1 minute equals 60 seconds, so 2 minutes equals 120 seconds. 2 minutes and 1 second equals 121 seconds. The rate of cup 2 will be calculated as:

The rate of cup 2 is 59.50 tsp/h.

- Cup 3: 3 tsp, 2 minutes 34 seconds. 2 minutes are the same that 120 seconds, so 2 minutes 34 seconds equals 154 seconds. The rate of cup 3 is calculated as follows:

The rate of cup 3 is 70.13 tsp/h.

Standard temperature and pressure (STP) is defined as a temperature of 0 degrees Celsius (273.15 Kelvin) and a pressure of 1 atmosphere (atm). The correct answer is C. Outdoors on a summer day.

While conditions may vary, outdoors on a typical summer day, the temperature and pressure are more likely to be close to the standard conditions. Inside a car tire (Option A), the air pressure can be higher than atmospheric pressure due to inflation. Above a bowl of ice water (Option B), the temperature may be lower than standard temperature. Above a pot of boiling water (Option D), the temperature is higher than standard temperature. At the top of a tall mountain (Option E), the atmospheric pressure is lower than at sea level, resulting in non-standard pressure. Therefore, the most likely location where the air would be at standard temperature and pressure is option C, outdoors on a summer day.

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The functional group in the molecule 3-iodo-2,2,4,4-tetramethylpentane is an alkyl halide, specifically an iodide (-I) group.

Regardless of the other atoms in the molecule, a functional group is a collection of atoms that have specific chemical characteristics. Covalent bonds bind the atoms in a functional group to the other molecules in the molecule as well as to one another. Functional groups connect to the nonpolar carbon atoms at the center of the repeating units of polymers, giving carbon chains a chemical identity. This functional group is formed by the replacement of a hydrogen atom in an alkane by a halogen atom. In this case, the halogen is iodine and the alkane is tetramethylpentane.

It is important to note that this compound doesn't have any other functional groups, it is only an alkyl halide.

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The result of composing the weight of a substance with the weight of an equal amount of water is known as specific gravity.

The specific gravity is the quantity which is defined as the ratio of the density of the substance and the density of water at a specified temperature and the pressure. the specific weight is defined as the ratio of the weight of substance to the volume of the water. the specific gravity is also called as the relative density.

Thus, The result of composing the weight of a substance with the weight of an equal amount of water is known as specific weight.

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Chemical reactions that take place in the body are mediated by enzymes. Enzymes are proteins that act as catalysts in chemical reactions, speeding up the process without being consumed or changed in the reaction.
Enzymes are proteins that act as catalysts in chemical reactions. They work by forming an active site on their surface that binds to reactants in the reaction, then lowering the activation energy required to form the products. This means that they speed up the process without being consumed or changed in the reaction.

Enzymes are basically the proteins that help speed up metabolism, or the chemical reactions in human bodies. They usually build some substances and break the others down.

All living things have enzymes in them. Our bodies naturally produce these enzymes. But enzymes are also present in manufactured products and food.

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The ionic compound between each pair of elements has the following formula:

(a) Al₂S₃

(b) AlN

(c) K₂O

(d) SrI₂

(e) MgO

(f) BaF₂

(g) SrS

(h) Be₃N₂

The formula for the ionic compound for each pair is:

(a) Aluminium and Sulfur

Aluminum sulfide, also known as Al₂S₃, is created when aluminum and sulfur combine. Its molar mass is 150.158 g/mol. Al has a +3 oxidation state while the sulfur in Al₂S₃ is in a -2 oxidation state.

Al⁺³ + S⁻² → Al₂S₃

(b) Aluminium and Nitrogen

Solid aluminum nitride is known as aluminum nitride (AlN). It is an electrical insulator with high thermal conductivity of up to 321 W/(mK).

Al⁺³ + N⁺³ → AlN

(c) Potassium and Oxygen

When potassium and oxygen are combined, potassium oxide results as an ionic molecule. It has the chemical composition K₂O. Because it is highly reactive, potassium cannot be found in its free form. It easily forms K₂O when combined with oxygen atoms due to its +1 valency.

( K₂ )⁺¹ + O²⁻ → K₂O

(d) Strontium and iodine

Ions of strontium and iodide combine to form the ionic compound known as strontium iodide.

Strontium has the chemical symbol Sr and a valency of +2. Iodine also bears the symbol I and the valency of -1.

(Sr)⁺² + I⁻¹ → SrI₂

(e) Magnesium and Oxygen

Magnesium oxide MgO) is created through the ionic interaction of magnesium (Mg) with oxygen (O₂). While oxygen has six valence electrons, magnesium only has two.

Mg⁺² + O²⁻ → MgO

(f) Barium and Fluorine

Because it is made up of a barium cation with a +2 charge and a fluoride anion with a charge of 1, barium fluoride is an ionic compound. This substance has the chemical formula BaF₂.

Ba²⁺ + F⁻¹ → BaF₂

(g) Strontium and Sulfur

Strontium serves as the anion and sulfur is the cation. Due to its presence in Group II, strontium has a valency of 2. The sulfur atom will gain 2 electrons and currently has 6 electrons in its outermost shell. Sulfur's valency is therefore 2.

Sr⁺² + S²⁻ → SrS

(h) Beryllium and Nitrogen

Because nitrogen is a non-metal and beryllium is a metal, an ionic link is created between the two. Be₃N₂ is formed when Beryllium and nitrogen is reacted.

Be²⁺ + N³⁻ → Be₃N₂

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The complete question is mentioned below:

Write a formula for the ionic compound that forms between each pair of elements.

a. Aluminum and Sulfur

b. Aluminum and Nitrogen

c. Potassium and Oxygen

d. strontium and iodine

e. magnesium and oxygen

f. barium and fluorine

g. strontium and sulfur

h. beryllium and nitrogen

Considering the ideal gas law, the correct answer is the third option: the volume of the gas at 323 K and 0.80 atm, if there are 0.75 moles of the gas is 25 L.

An ideal gas is called a hypothetical or theoretical gas, which would be composed of particles that move randomly and without interacting with each other.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

Where:

Replacing in the ideal gas law:

0.80 atm×V = 0.75 moles×0.0821 (atmL)÷(molK)×323 K

Solving:

V = (0.75 moles×0.0821 (atmL)÷(molK)×323 K)÷ 0.80 atm

V= 25 L

Finally, the volume of the gas is 25 L.

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Ernest Rutherford and James Chadwick are credited with discovering protons and neutrons. Rutherford conducted studies in the early 1900s that proved the existence of a dense, positively charged core inside atoms, which he dubbed the "nucleus." He also discovered that the nucleus of an atom contains the majority of its mass.

James Chadwick investigated the structure of the nucleus using a technique known as "scattering experiments" in the early 1910s. He discovered that the nucleus is made up of two types of particles: protons and neutrons. Protons are positively charged particles, whereas neutrons are neutral particles (i.e. they have no charge).

The discovery of the nucleus by Rutherford was a significant step in understanding the structure of atoms. Chadwick's discovery of protons and neutrons, on the other hand, provided a more precise understanding of the nucleus' composition. The discovery of protons and neutrons spawned the area of nuclear physics, which investigates the properties and behaviour of atomic nuclei.

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a. 1,4332 g

b. 7.54~g

Given

Reaction

MgCl2 (s) + 2 AgNO3 (aq) → Mg(NO3)2 (aq) + 2 AgCl (s)

20 cm of 2.5 mol/dm^3 of MgCl2

20 cm of 2.5 g/dm^3 of MgCl2

Required

the mass of silver chloride - AgCl

Solution

a. mol MgCl2 :

\(\tt 20~cm^3=20\times 10^{-3}~dm^3\\\\mol=M\times V\\\\mol=2.5~mol/dm^3\times 20\times 10^{-3}DM^3=0.05\)

From equation, mol AgCl = 2 x mol MgCl2=2 x 0.05=0.1

mass AgCl(MW=143,32 g/mol)= 0.1 x 143,32=1,4332 g

b. mol MgCl2 (MW=95.211 /mol):

\(\tt mol=M\times V\\\\mol=\dfrac{2.5~g/dm^3}{95,211 g/mol}=0.0263~mol/dm^3\)

From equation, mol AgCl = 2 x mol MgCl2=2 x 0.0263=0.0526

mass AgCl(MW=143,32 g/mol)= 0.0526 x 143,32=7.54~g

There are approximately 2.94 x 10^22 copper atoms in a copper penny with a mass of 3.10g. To calculate the number of copper atoms in a copper penny with a mass of 3.10g, follow these steps:

1. Determine the molar mass of copper: Copper (Cu) has a molar mass of approximately 63.55 g/mol.
2. Convert the mass of the penny into moles: Divide the mass of the penny (3.10g) by the molar mass of copper (63.55 g/mol).
 
Moles of copper = 3.10g / 63.55 g/mol = 0.0488 moles

3. Use Avogadro's number to convert moles to atoms: Avogadro's number is approximately 6.022 x 10^23 atoms/mol. Multiply the moles of copper by Avogadro's number to find the number of copper atoms.

Number of copper atoms = 0.0488 moles * 6.022 x 10^23 atoms/mol = 2.94 x 10^22 atoms

So, there are approximately 2.94 x 10^22 copper atoms in a copper penny with a mass of 3.10g, assuming it is composed of pure copper.

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The use of cold ethanol instead of hot ethanol in recrystallization would hinder the dissolution process, result in slower crystal formation, and compromise the purity of the final product. Therefore, it is essential to follow the appropriate recrystallization procedure using hot ethanol to obtain the desired results.

The process of recrystallization involves dissolving a solid in a suitable solvent and then allowing it to crystallize out under controlled conditions. The choice of solvent and temperature is crucial in achieving successful recrystallization. In the given scenario, if cold ethanol is used instead of hot ethanol, the process of recrystallization may not work effectively for several reasons.

Firstly, ethanol has a lower solubility for many compounds at lower temperatures. Cold ethanol may not be able to dissolve the compound completely, leading to incomplete or inefficient recrystallization. The purpose of recrystallization is to obtain pure crystals, free from impurities. If the compound is not dissolved adequately, impurities may remain trapped, resulting in impure crystals.

Secondly, the rate of crystal formation is significantly slower at lower temperatures. By using hot ethanol, the solvent's increased kinetic energy allows for faster dissolution and subsequent recrystallization. Cold ethanol would not provide the same level of energy, leading to slower crystallization kinetics. This slower process increases the chances of impurities being trapped within the crystal lattice, diminishing the purity of the final product.

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Extensive property is dependent on mass. Intensive property is property that depends only on the type of matter rather than the amount. Hense, Volume is an example of Extensive property and Density is an example of Intensive property.

Hope this helps :)

First jou adjust the Al, then the Br and last the K and you will see that the SO4 is adjusted.

The equilibrium concentration (in M to three decimal places) of HBr for the given reaction is 0.025 M at 25 °C.

Let x be the equilibrium concentration of HBr. Then, the equilibrium concentrations of \(H_2\) and \(Br_2\) will also be x, since the stoichiometry of the reaction is 1:1:2.

Using the equilibrium constant expression for this reaction:

\(K = [HBr]^2/ ([H_2] [Br_2])\)

Substituting the initial concentrations and the equilibrium concentrations in terms of x:

0.000351 = (2x)² / (0.5 - x)²

Solving for x:

0.000351 (0.5 - x)² = 4x²

0.0001755 - 0.000702 x + 0.000351 x² = 4x²

3.99965 x² + 0.000351 x - 0.0001755 = 0

Using the quadratic formula:

x = (-0.000351 ± √(0.000351² + 4(3.99965)(0.0001755) / (2(3.99965))

x ≈ 0.025 M (rounded to three decimal places)

Therefore, the equilibrium concentration of HBr is 0.025 M.

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Answer:

high rates of evaporation