anwser this ASAP please

Answer:

Noble Gases are very stable because...

1) Noble Gases have a full octet

2) Low chemical reactivity

Explanation:

This means that is has 8 valence electrons so it won't need any more, so it is less likely to react with other substances.

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Avogadro's number is approximately 6.022 × 10^23 formula units per mole.

Given that there are 3.0 × 10^23 formula units of KI, we can calculate the number of moles of KI by dividing the number of formula units by Avogadro's number:

Number of moles = (3.0 × 10^23 formula units) / (6.022 × 10^23 formula units/mol)

Number of moles ≈ 0.498 mol

To find the mass of KI, we can use the molar mass of KI:

Mass of KI = Number of moles × Molar mass

Mass of KI = 0.498 mol × 166 g/mol

Mass of KI ≈ 82.668 g

Therefore, there are approximately 82.668 grams of KI in the sample.

1.60 grams of Argon gas at STP is equal to 11.2 L.

What is standard temperature and pressure?

Standard temperature and pressure (STP) is a set of conditions that are commonly used as a reference point for measuring the properties of gases and other substances. At STP, the temperature is defined as 0 degrees Celsius (273.15K) and the pressure is defined as 1 atmosphere (101.325 kPa).

The volume of a gas at standard temperature and pressure (STP) can be calculated using the ideal gas law:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant and T is the temperature.

At STP, the pressure is 1 atm and the temperature is 0°C (273.15 K)

We can use the equation n = m/M , where n is the number of moles, m is the mass and M is the molar mass.

Given that the mass of Argon is 1.60 grams, we can calculate the number of moles:

n = m/M = 1.60/40 = 0.04 mol

We can substitute the value of n, P, T and R into the ideal gas law to calculate the volume.

V = nRT/P = 0.04 mol * 8.314 J/mol*K * 273.15 K / 1atm = 11.2 L

Therefore, 1.60 grams of Argon gas at STP is equal to 11.2 L.

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The concentration of the solute within the solution, in mole percent, is approximately 0.555 mole percent.

To determine the concentration of the solute in mole percent, we need to convert the given mass concentration of water (18.8 mg/L) to molar concentration and then calculate the mole percent.

First, we convert the mass of water to moles. The molar mass of water (H₂O) is approximately 18.015 g/mol. We can use this molar mass to convert the mass of water to moles:

Mass of water (in grams) = 18.8 mg = 18.8 x 10⁻³ g

Number of moles of water = Mass of water (in grams) / Molar mass of water

Next, we need to convert the number of moles of water to molar concentration (moles per liter). The given concentration is 18.8 mg/L, so we divide the number of moles by the volume (1 liter) to obtain the molar concentration:

Molar concentration of water = Number of moles of water / Volume of solution

Now, we have the molar concentration of the solute (water). To calculate the mole percent, we divide the molar concentration of water by the total molar concentration of the solution and multiply by 100:

Mole percent = (Molar concentration of water / Total molar concentration) x 100

Since the vapor above the aqueous solution only contains water as the solute, the total molar concentration of the solution is equal to the molar concentration of water. Therefore, the mole percent can be calculated as:

Mole percent = (Molar concentration of water / Molar concentration of water) x 100 = 100

Therefore, the concentration of the solute within the solution, in mole percent, is approximately 0.555 mole percent.

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Complete Question:

The vapor above an aqueous solution contains 18.8 mg water per liter at 25 ∘C. Assuming ideal behavior, what is the concentration of the solute within the solution in mole percent?

Answer:

A biology investigation usually starts with an observation—that is, something that catches the biologist’s attention. For instance, a cancer biologist might notice that a certain kind of cancer can't be treated with chemotherapy and wonder why this is the case. A marine ecologist, seeing that the coral reefs of her field sites are bleaching—turning white—might set out to understand why.

How do biologists follow up on these observations? How can you follow up on your own observations of the natural world? In this article, we’ll walk through the scientific method, a logical problem-solving approach used by biologists and many other scientists.

Explanation:

Answer:

The molecular shape of hydrogen sulfide is bent.

Explanation:

The central atom sulfur is bonded to two hydrogen atoms. Sulfur can form two bonds following the octet rule.

The molecular geometry of H2S is bent shape or V-shape.

Hydrogen sulphide has a structure that is comparable to water's. A mixture of two hydrogen atoms and one sulphur atom makes up the Lewis structure of hydrogen sulphide. The main particle, sulphur, is composed of two lone hydrogen atoms that are joined together by a single bond.

Six valence electrons make up sulphur, and two of those are used to create the two S–H bonds. Two lone pairs are now left, which crowd and repel the bonding electrons to prevent them from forming a linear structure. Since there are 92 degrees between the two SH bonds, the form is a "V."

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The change in color and the noticeable decrease in temperature strongly suggest that a chemical reaction has occurred. These observations are consistent with the formation of a new substance.

The student observes several indications that a chemical reaction has taken place in the mixture.

Firstly, the mixture bubbles turn blue, indicating the formation of a new substance. This change in color suggests a chemical transformation has occurred, as the original purple powder and clear liquid have combined to produce a different compound.

Additionally, the container feels much colder after the mixing process. This is likely due to an exothermic reaction taking place, where energy is released in the form of heat. The reaction between the purple powder and clear liquid may have released energy, causing the container to feel colder to the touch.

Overall, the change in color and the noticeable decrease in temperature strongly suggest that a chemical reaction has occurred. These observations are consistent with the formation of a new substance and the release of energy, indicating a chemical transformation has taken place between the reactants.

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Note - The complete questions is "A student conducts an experiment by mixing 100 grams of a purple powder with 100 grams of a clear liquid in a closed container. During the process, the student notices several changes. Firstly, the mixture begins to bubble, and these bubbles gradually turn blue. Secondly, the student observes that the container feels significantly colder than before the mixing occurred. Based on these observations, the student concludes that a chemical reaction has taken place. What could be the possible chemical reaction occurring in the mixture?"

Answer:

The number ''n''of a period on the periodic table is the same as the number of the highest principal energy level for the atoms on that row that is, the principal energy level occupied by its valence electrons. Thus, elements on period 1 have a highest principal energy level of 1, and so on.

Answer:

Nitrogen, the next nonmetal, has 5 electrons in the valence shell, so it needs to combine with 3 hydrogen atoms to fulfill the octet rule and form a stable compound called ammonia (NH3).

The covalent compound formed from nitrogen and hydrogen is called ammonia with the formula NH₃.  Each hydrogen shares its valence electron with three valence electrons of nitrogen.

Ammonia,  NH₃ is a covalent compound formed by the combination of nitrogen and three hydrogen atoms. Nitrogen is a highly electronegative element with 5 valence electrons.

Nitrogen needs 3 more electrons to achieve octet. Hence valency of nitrogen is 3. During chemical bonding it gains three electrons though sharing or donation from metals.

Hydrogen needs one more electron to be stable. Hence, nitrogen shares its three valence electrons each with three hydrogens and each hydrogen in turn shares its one valence electron with nitrogen forming NH₃.

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The final temperature of the gas is 300 Kelvin (or 26.85 degrees Celsius).

To solve this problem, we can use the Ideal Gas Law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the gas constant, and T is temperature in Kelvin. We can assume that the number of moles and the gas constant remain constant.
First, we need to convert the temperature from Celsius to Kelvin by adding 273.15. So the initial temperature is 318.15 K.
Next, we can use the initial conditions to solve for nR/P.
nR/P = (12.0 mL * 8.0 bar) / 1000 mL/L = 0.096 L*bar/mol
Now we can use this value and the new volume and pressure to solve for the final temperature.
T = (nR/P) / (Vf) = (0.096 L*bar/mol) / (40.0 mL / 1000 mL/L * 2.0 bar) = 1.2 L*bar/mol / L*bar/K = 300 K
Therefore, the final temperature of the gas is 300 Kelvin (or 26.85 degrees Celsius).

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a)  The impulse response is

u(t) - 2u(t-1) + u(t-2)

This is a causal system as it depends only on the present and past input values.

b) The impulse response is absolutely summable and hence the system is stable.

c) The system responses are

y1(t) = 2δ(t) - δ(t-2) - 2δ(t+2)

y2(t) = δ(t-1) - 2δ(t) + δ(t-2) - 2δ(t+1) + 4δ(t+2) - 2δ(t+3)

Given, the impulse responses of two LTI systems are as follows:

h1(t) = u(t+1) - u(t-3)

and

h2(t) = u(t) - 2u(t-1) + u(t-2)

(a) Causal systems are those which have their output dependent only on the present and past input values.

To check whether the given systems are causal or not, we have to check the impulse responses for h1(t) and h2(t).

For h1(t), the impulse response isu(t+1) - u(t-3)

It is not causal as the output for t < -1 will depend on the future input values.

For h2(t), the impulse response is

u(t) - 2u(t-1) + u(t-2)

This is a causal system as it depends only on the present and past input values.

(b) The systems will be stable if the impulse responses are absolutely summable.

For

h1(t),|h1(t)| = |u(t+1) - u(t-3)|
= 1 for t = 2, 3, ..., 4
= 0 elsewhere

∴ The impulse response is absolutely summable and hence the system is stable.

For h2(t)

|h2(t)| = |u(t) - 2u(t-1) + u(t-2)| = 1

for t = 2, 3
= 0 elsewhere

∴ The impulse response is absolutely summable and hence the system is stable.

(c) The response of the system to the input

x(t) = δ(t-1) - 2δ(t+1)

will be given by

y(t) = x(t) * h(t)

where, h(t) is the impulse response of the system

For h1(t), the impulse response is

h1(t) = u(t+1) - u(t-3)

Therefore,

y1(t) = x(t) * h1(t)

= (δ(t-1) - 2δ(t+1)) * (u(t+1) - u(t-3))
= δ(t) - δ(t-2) - 2δ(t+2) + 2δ(t)
= 2δ(t) - δ(t-2) - 2δ(t+2)

For h2(t), the impulse response is

h2(t) = u(t) - 2u(t-1) + u(t-2)

Therefore,

y2(t) = x(t) * h2(t)

= (δ(t-1) - 2δ(t+1)) * (u(t) - 2u(t-1) + u(t-2))
= δ(t-1) - 2δ(t) + δ(t-2) - 2δ(t+1) + 4δ(t+2) - 2δ(t+3)

The plots of the system responses are as follows:

Therefore, the system responses are

y1(t) = 2δ(t) - δ(t-2) - 2δ(t+2)

y2(t) = δ(t-1) - 2δ(t) + δ(t-2) - 2δ(t+1) + 4δ(t+2) - 2δ(t+3)

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The draping at the beginning of a perm service should include a plastic cape and a towel or neck strip.

During a perm service, draping is an essential step to protect the client's clothing from any chemical spills or solutions. It also helps to ensure the client's comfort during the process. The draping process typically involves placing a plastic cape over the client's clothes and securing it with a clip or collar.

Additionally, a towel or neck strip should be placed around the client's neck to prevent any solution from running down their back. This helps to prevent any discomfort or irritation caused by the solution on the client's skin.

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Based on the given chemical equation, the value of coefficient that is used in the reaction before each molecule is 1.

Balanced chemical equations are those equation in which each element is present in equal amount on both side of the chemical reaction.

Given chemical reaction is:

BaO₂ + H₂SO₄ → H₂O₂ + BaSO₄

Above reaction is balanced as all elements are present in equal amounts on both sides. So, the value of coefficients is 1.

Hence the required coefficients is 1.

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Answer:

Every single box is 1.

Explanation:

The group of organs that work together to perform a specific function is called an organ system.

As temperatures boom, decay charges of plant life increase. when flora decay they release methane, a greenhouse gasoline. wonderful. negative

A greenhouse gas is a gas that absorbs and emits radiant strength inside the thermal infrared variety, inflicting the greenhouse effect. The number one greenhouse gases in Earth's ecosystem are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. the principal gases accountable for the greenhouse effect include carbon dioxide, methane, nitrous oxide, water vapor (which all arise certainly), and fluorinated gases (which might be artificial). Greenhouse gases have distinct chemical houses and are eliminated from the surroundings, over the years, by means of distinctive procedures.

A greenhouse fuel is referred to as that as it absorbs infrared radiation from the sun in the form of heat, that is circulated inside the atmosphere and eventually misplaced in space.

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Answer:

Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. ... Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.

Answer/Explanation:

A higher temperature causes the molecules in a substance to move faster in a chemical change. This increased speed allows the particles to have enough force for a chemical change and it also increases the amount of times a particle hits another this makes it faster for it to combine.

Answer: m mm

/lk ac

Explanation:

The percentage yield of the iron is obtained as 71.4 %.

We know that the stoichiometry of a reaction can help us to be able to find the amount of the substances that have been used in a process. In this case, we have been shown the balanced reaction equation of the reaction in the image that have been attached to the question.

We can see that;

Mass of the iron III oxide = 80 tonnes or 8 * 10^7 g

Mass of iron produced =  40 tonnes of 4 * 10^7 g

Number of moles of iron III oxide reacted = 8 * 10^7 g/160 g/mol

= 5 * 10^5 moles

If 1 mole of iron III oxide produces 2 moles of iron

5 * 10^5 moles of iron III oxide produces;

5 * 10^5 moles * 2 moles/ 1 mole

= 1 * 10^6 moles

Theoretical yield of the iron =   1 * 10^6 moles * 56 g/mol

= 5.6 * 10^7 g

Percent yield = actual yield/Theoretical yield * 100/1

= 4 * 10^7 g/5.6 * 10^7 g * 100/1

= 71.4 %

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when 500 grams of ice at -2 °C is placed in 1000 grams of liquid water at 4 °C.  the final temperature is 10 °C.

The specific heat capacity expression is given as :

Q = mc ΔT

the heat lost = the heat gained

mc ΔT = mc ΔT

500 × ( T + 2 ) = 1000 × ( T- 4)

500 T + 1000 = 1000 T - 4000

500 T = 5000

T = 10 °C

Thus, when 500 grams of ice at -2 °C is placed in 1000 grams of liquid water at 4 °C.  the final temperature is 10 °C.

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Answer:

The molecules experienced a physical change from a solid state to a gaseous state, which increased the molecular movement and the energy of the carbon dioxide molecules

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The statement which best describes the change in the energy and physical characteristics of the molecules of carbon dioxide during this process is (B) The molecules experienced a chemical change as the carbon dioxide reacted with oxygen, which released oxygen gas into the environment and increased the molecular movement.Hence, The correct option is (B)

Physical changes are those that affect a chemical substance's form but not its chemical content.

Physical changes may normally be used to separate compounds into chemical elements or simpler compounds, but they cannot be used to separate mixtures into their component compounds.

A change in physical attributes accompanies a physical change. Melting, turning into a gas, and changing strength are a few examples of physical qualities.

Therefore, molecules of carbon dioxide during this process is (B) The molecules experienced a chemical change as the carbon dioxide reacted with oxygen, which released oxygen gas into the environment and increased the molecular movement.Hence, The correct option is (B)

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Answer:

v = 1130 cm³

Explanation:

Given data:

Volume of sample = ?

Mass of Al sample = 3.057 Kg (3.057 Kg× 1000g/1 Kg = 3057g)

Density of Al sample = 2.70 g/cm³

Solution:

Formula:

d = m/v

d = density

m = mass

v= volume

by putting values

2.70 g/cm³ = 3057g /v

v = 3057g /2.70 g/cm³

v = 1130 cm³

Answer:

Explanation:

The sketch of the curve for two Br atoms can be seen in the image attached below. From the image below, we can deduce the following:

On the periodic table, the Bromine (Br) atom is the fourth member in the halogen family group. The atomic size increases from top to bottom down the group, thus Br atom posses a larger atomic size than Cl atom. As a result of that, the bond length formation between the two Br atoms will be larger compared to that of the two Cl atoms.

Answer:

hbjvcbhjkcvbfhg  

Explanation:

C3H8 is the limiting reactant because we have only 10.0 mol of it, which is less than the 15.0 mol we started with.

To determine the limiting reactant in a chemical reaction, you need to compare the number of moles of each reactant to the stoichiometric coefficients in the balanced chemical equation. The reactant that produces the least amount of product is the limiting reactant.

In this case, we have 15.0 mol of C3H8 and 50.0 mol of O2. To compare the two, we need to convert them to the same unit, either moles of C3H8 or moles of O2. Since the stoichiometric coefficient of O2 is 5, we can convert the 15.0 mol of C3H8 to moles of O2:

15.0 mol C3H8 x (5 mol O2 / 1 mol C3H8) = 75.0 mol O2

Now we can see that we have 75.0 mol of O2 and 50.0 mol of O2. Since the reaction requires 5 moles of O2 for every 1 mole of C3H8, the 50.0 mol of O2 will only react with:

50.0 mol O2 / 5 mol O2 per C3H8 = 10.0 mol C3H8

Therefore, C3H8 is the limiting reactant because we have only 10.0 mol of it, which is less than the 15.0 mol we started with.

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There are 1.31 x 1022 bromide ions in 2.00 g of \(MgBr_2\).

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Answer:

Ca ( s ) calcium + 2 HCl ( aq ) hydrochloric acid → CaCl 2 ( s ) calcium chloride + H 2 ( g ) hydrogen .

Explanation:

Answer:

Consequently, what happens when gas obtained by heating slaked lime and ammonium chloride is passed through copper sulphate solution? The HCl in the gas mixture will form hydrochloric and the H+ will react with some of the NH3(aq), forming NH4^+, and with some of the SO4^2-, forming HSO4^-.

The gas obtained by heating Ammonium Chloride and slaked lime is passed through copper sulphate, deep blue solution will be formed.

The gas obtained by heating Ammonium Chloride and slaked lime is ammonia gas.

2NH₄Cl + Ca(OH)₂  ---> CaCl₂ + 2NH₃ + 2H₂O

Ammonia reacts with copper (II) ions to precipitate light blue copper hydroxide.

Ammonia causes the copper ion to go back into the solution as a deep blue ammonia complex.

However, in excess ammonia, the precipitate dissolves.

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Answer:

MARK AS THE BRAINLIEST ANSWER

Explanation:

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