What is the temperature of Spica?

The mass of an element released during electrolysis is inversely proportional to the amount of electricity flowing through the electrolyte, according to the first law.

Mathematically, this can be expressed as: deposited mass, current, I, and time, t, or deposited mass, It. Where Q=Charge, M=Molarmass, n=nfac. A) M=Qm/Fn, the mass (m) of a substance deposited on the cathode or anode during electrolysis is given. Silver atoms are added to the cathode and subtracted from the anode for each element that circles the external circuit. This indicates that the mass obtained by the cathode is equal to the mass lost by the anode (assuming the silver anode is pure; see below).

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Answer: Why exacly am i a rat

Explanation:

,....

but thanks

Answer:

what!!!??????

The percent composition of nitrogen in sodium nitride is approximately 16.87%.

The percent composition of nitrogen in sodium nitride (Na₃N) can be calculated by determining the molar mass of nitrogen and the molar mass of the compound as a whole.

molar mass

molar mass of nitrogen = 14.01 grams

molar mass of sodium nitride = (3 * molar mass of Na) + (1 * molar mass of N)

molar mass of sodium nitride = (3 * 22.99 g/mol) + (1 * 14.01 g/mol)

molar mass of sodium nitride =  82.98 g/mol

percent composition of nitrogen

Percent composition of nitrogen = (molar mass of N / molar mass of  Na₃N) * 100

Percent composition of nitrogen = (14.01 g/mol / 82.98 g/mol) * 100

Percent composition of nitrogen = 16.87%

Therefore, the percent composition of nitrogen in sodium nitride is approximately 16.86%.

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To calculate the pH of a solution made by mixing equal volume of aqueous solutions of 1.0 M and 1.2 M NaOH, we need to consider the dissociation of NaOH in water and the resulting concentration of hydroxide ions (OH-) in the solution.

NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, when we mix equal volumes of 1.0 M and 1.2 M NaOH solutions, the resulting concentration of OH- ions in the mixed solution will be:

OH- concentration = (1.0 M + 1.2 M) / 2

OH- concentration = 2.2 M / 2

OH- concentration = 1.1 M

Now, to calculate the pOH of the solution, we use the equation:

pOH = -log[OH-]

pOH = -log(1.1)

pOH ≈ 0.0414

Finally, to calculate the pH of the solution, we use the equation:

pH = 14 - pOH

pH = 14 - 0.0414

pH ≈ 13.9586

Therefore, at 40°C, the pH of the solution made by mixing equal volumes of 1.0 M and 1.2 M NaOH solutions is approximately 13.96.

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Answer:

the reaction between vinegar and baking soda, the reactants are vinegar (acetic acid) and baking soda (sodium bicarbonate). The products are sodium acetate, water, and carbon dioxide gas.

Answer: A.) unsaturated

Explanation:

Answer:

Density is 2.7 g/ml³

Explanation:

\(density = \frac{mass}{volume} \\ \)

mass » 13.5 g

volume » 5 ml³

\(density = \frac{13.5}{5} \\ \\ = 2.7 \: {g \: ml}^{ - 3} \)

Answer:

\(\boxed {\boxed {\sf 2.7 \ g/mL}}\)

Explanation:

Density is a substance's mass per unit volume. The formula for calculating density is as follows.

\(\rho= \frac{m}{v}\)

The mass of the rock is 13.5 grams and the volume of the rock is 5 milliliters.

Substitute these values into the formula.

\(\rho= \frac{13.5 \ g}{5 \ mL}\)

Divide.

\(\rho= 2.7 \ g/mL\)

The density of the rock is 2.7 grams per milliliter.

Valence bond theory predicts that xenon will use sp3d2 hybrid orbitals in IF4- (minus one charge).

In valence bond theory, atoms form chemical bonds by overlapping their atomic orbitals. Hybridization occurs when atomic orbitals mix together to form a new set of hybrid orbitals with different shapes and energies. These hybrid orbitals allow for the formation of stronger and more stable bonds.

Xenon is an element in the noble gas group, which typically does not form bonds. However, in IF4- (minus one charge), xenon does participate in bonding.

To determine the hybridization of xenon in IF4-, we need to consider the number of electron pairs and lone pairs around the xenon atom. In IF4-, there are four fluorine atoms bonded to the central xenon atom, resulting in four electron pairs. Additionally, there is one lone pair on the xenon atom.

The total number of electron pairs (bonded pairs + lone pairs) is therefore five.

To accommodate these electron pairs, xenon undergoes sp3d2 hybridization. This means that one 2s, three 2p, and two 5d orbitals of xenon mix to form five new hybrid orbitals. These hybrid orbitals are arranged in an octahedral shape around the xenon atom, with the four fluorine atoms and one lone pair occupying the five hybrid orbitals.

This hybridization allows xenon to effectively bond with the fluorine atoms in IF4- and maintain a stable structure.

In summary, valence bond theory predicts that xenon will use sp3d2 hybrid orbitals in IF4- (minus one charge). These hybrid orbitals accommodate the five electron pairs around the xenon atom, allowing for the formation of stable bonds with the fluorine atoms.

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it is A it got to be A)-4k

Explanation:

The percentage decrease in the amount of dissolved oxygen is 10%

Percent yield is the percent ratio of actual yield to the theoretical yield. It is calculated to be the experimental yield divided by theoretical yield multiplied by 100%. If the actual and theoretical yield ​are the same, the percent yield is 100%

In chemistry, yield is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage.

From the graph,

The amount of dissolved oxygen at  15°C is 10 mg/L

The amount of dissolved oxygen at  20°C is 9 mg/L

The decrease in the amount of dissolved oxygen is 1mg/L

The percentage decrease = (1/10) × 100 = 10%

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When atoms or molecules absorb energy, it is often released as light energy

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Answer:

first is c and second is a

Answer:

Because.in theory, it's impossible for philosophers (Greeks) don't have the proper equipment and also they don't have enough facts to back it up

Explanation:

Hope this helps

There are four types of speeches, they are to inform, to instruct, to entertain, and to persuade. Entertaining speeches aim to amuse a crowd of people.

The speeches which are designed to capture the audience attention and to amuse or regale them while delivering a message is defined as the Entertaining speech. Like informative or persuasive speeches, the Entertaining speech should able to communicate a clear message.

These speeches are delivered on some special occasions like wedding, award show, motivational speech, etc. This speech is not just to humor but also to drama. The aim of this speech is to stir an audience emotion.

Thus the Entertaining speech is often used to bring people together.

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Explanation:

bro this question looks like Astrophysics

By using the universal gravitational law, the gravitational force between the lander and the planet is 688.4 × 10³ N. The acceleration due to gravity of the lander is 6.25 m/s² . The slight changes in gravity may be due to the change with different latitudes of the planet.

Gravitational force is the force by which an object attracts other objects into its center of mass. According to universal gravitational law, the gravitational force can be calculated for two masses m1 and m2 at a distance of r with gravitational constant G as follows:

g = G m1m2/r²

Apply the given values of mass and orbital radius to the equation as follows:

g = (6.647 × 10⁻¹¹ N m² Kg⁻²) (1.1 × 10⁵ Kg × 7.6×10²⁴ Kg ) / (9 × 10⁶ m)²

  =  688.4 × 10³ N.

The acceleration due to gravity of the lander = force /mass

                                                                           =   688.4 × 10³ N /1.1 × 10⁵Kg

                                                                           = 6.25 m/s²

The actual force of gravity may change from the may slightly change from the calculated value because different latitudes will experience different gravity.

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Answer:

The third choice

Explanation:

The law of conservation of mass tells us that the mass of the reactants and products in a chemical reaction will be equal to one another. Equations follow the law of conservation of mass when they are balanced, which means that they have the same number and type of atoms on each side.

When individual atoms are counted, the third choice has the same number and type of atoms on each side: 1 gallium, three cesium and three fluorine.

The number of protons is equal to the number of electrons.

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the crystal field stabilization energy of a low spin d7 complex in an octahedral crystal field is −1.8Δo

The ligand is a strong field ligand, and the supplied complex is an octahedral complex. Since it has a low spin, the pairing energy will be lower than the energy required to split the crystal field.

CFSE for octahedral complex =[−0.4(n)t2g+0.6(n′)eg ]Δo+n∗P

Where,

n is number of e− occupying t2g orbital

n' is the number of e− occupying eg orbital

Δois ligand field splitting energy

n∗ is the number of extra electron pairs

P is spin-pairing energy

The CFSE of a d7 octahedral complex = −0.4×6+0.6×1

= −2.4+0.6

= −1.8Δo

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Answer:

No, the student is not correct. The earth may have a lot of water... but not every part of water is drinkable. Most water is filled with bacteria and or viruses making it not suitable to drink! :)

Explanation:

HOPE THIS HELPS! BRAINLIEST? :)

Answer:

Because after increasing of temperature kinetic energy of molecules increases and reaction speed increases in forward or reverse direction.

Explanation:

Answer:

0.3 J

Explanation:

The equation for heat capacity is Q = mcΔT where Q is the heat, m is the mass of the substance, c is the specific heat capacity of the substance and delta T is the change in temperature. Plugging those values into the equation, we have Q = (.500)(0.24)(27.5-25) = 0.3

The amount of oxygen gas produced is directly related to the volume of hydrogen peroxide used in the trial. The reaction between hydrogen peroxide (H2O2) and an enzyme called catalase produces oxygen gas (O2) as one of the products.

The balanced chemical equation for the reaction is:

2 H₂O₂ → 2 H₂O + O₂

From the equation, it can be observed that for every 2 molecules of hydrogen peroxide consumed, 1 molecule of oxygen gas is produced.

Therefore, if you increase the volume of hydrogen peroxide used in the trial, the amount of oxygen gas produced will also increase in direct proportion. Similarly, if you decrease the volume of hydrogen peroxide, the amount of oxygen gas produced will decrease accordingly.

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A structural isomer is a compound that has the same number of atoms but is arranged differently. Therefore, to know which will be the structural isomer of the compound they give us, we must count the atoms of each compound.

When comparing the compounds we see that pent-2-yne has C5H8 just like 3-methylcyclobutene, therefore these two compounds are structural isomers.

The answer will be: 3-methylcyclobutene

Answer:

nitrogen

Explanation:

as the group number increases, the atomic radius decreases

The percent composition of an element in a compound can be found by the following formula:

Therefore, we must first find the weight of the lead(II) nitride molecule. The molecular formula of lead (Il) nitride is Pb3N2, so the molar mass of the element will be:

Molar Mass Pb3N2= Atomic Mass Pb x 3 + Atomic Mass N x 2

the values of the atomic mass of the elements are found in the periodic table.

Atomic Mass Pb=207.2u

Atomic Mass N=14.0067u

So, the molar mass of Pb3N2 will be:

The percent composition of nitrogen in Pb3N2 will be:

Answer: The percent composition of nitrogen in a compound of lead (Il) nitride is 4.31%

The pKa of Ph2PCH2PPh2, which is a commonly used bidentate ligand in organometallic chemistry, is around 7.

This means that at neutral pH (around 7), roughly half of the molecules will be in their protonated form (Ph2PCH2PPh2H+) and half in their deprotonated form (Ph2PCH2PPh2).

This equilibrium is important in controlling the reactivity of the ligand with metal centers, as well as in the stability of metal-ligand complexes formed. The pKa of Ph2PCH2PPh2 can be influenced by substituents on the phosphorus atoms, as well as by the nature of the metal center with which it coordinates.

Overall, understanding the pKa of ligands such as Ph2PCH2PPh2 is crucial for designing and optimizing organometallic reactions and catalysis.

The pKa value is an important parameter used to express the acidity of a compound.

It represents the negative logarithm of the acid dissociation constant (Ka) and indicates the tendency of a substance to donate a proton (H+) in an aqueous solution.

Regarding Ph2PCH2PPh2, which is also known as 1,2-Bis(diphenylphosphino)ethane (commonly abbreviated as DPPE), it is a diphosphine ligand that is often utilized in coordination chemistry and homogeneous catalysis.

DPPE is a strong σ-donor and a versatile ligand for transition metal complexes.

However, pKa values are typically associated with compounds that can act as acids, such as carboxylic acids, phenols, or even water. Since DPPE is not an acidic compound and does not have any acidic protons, its pKa value is not relevant. Instead, its properties and reactivity as a ligand in coordination chemistry are of greater interest.

In summary, the pKa of Ph2PCH2PPh2 (DPPE) is not applicable, as it is not an acidic compound with protons available for donation. Instead, its significance lies in its role as a ligand in coordination chemistry and homogeneous catalysis.

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The rate at which the volume of the snowball is decreasing when the radius is 14 cm is approximately -247.11 cm³/min.

We can use the formula for the volume of a sphere, V = (4/3)πr³, to relate the volume V to the radius r.

Taking the derivative of both sides with respect to time t, we get:

dV/dt = 4πr² (dr/dt)

where dV/dt represents the rate of change of volume with respect to time, and dr/dt represents the rate of change of radius with respect to time.

We are given that dr/dt = -0.4 cm/min (negative because the radius is decreasing). We need to find dV/dt when r = 14 cm.

Plugging in the given values, we get:

dV/dt = 4π(14 cm)² (-0.4 cm/min) ≈ -247.11 cm³/min

Therefore, the volume of the snowball is decreasing at a rate of approximately 247.11 cm³/min.

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Metallic elements exist in a solid-state and they are opaque, have a shiny surface, good conductors of electricity and heat, malleable and ductile, and are dense. The structure of metals is formed by atoms that are held together by metallic bonds. These atoms have loosely bound valence electrons that can be shared between the neighboring atoms.

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Answer:

The mole ratio of the cation and the anion in a precipitate is a simple fraction. ( im sorry if this dosent help a lot.)

Explanation: