ion channels: a. only open in response to a signal of some kind. b. require input of energy in order to function

Answer:

Median is 29.

Explanation:

add all them up and divide them

Answer:

18.9 moles of MgCl2 = 17.834 kg of MgCl2

Explanation:

The molecular weight of MgCl is 80.0 g/mol . So, to convert the given mole amount to grams, multiply this by this number, which is constant for all compounds with a specific composition (mass fraction).

Considering the original question was in the context of chemistry, I wanted to make it seem formal and more educational too. Hopefully that worked!  

EDIT: Came up with some text around what happens inside cells that would have made it better if someone just had an issue converting units, but I doubt my answer will be accepted >.<

A polyatomic ion is a group of atoms that are held together by covalent bonds, and they carry a net electrical charge. Therefore, the correct options are: "the atoms of a polyatomic ion are held together by covalent bonds", "the charge on a polyatomic ion belongs to the whole unit", and "a polyatomic ion always contains two or more different elements."

Polyatomic ions are often negatively charged due to the presence of one or more extra electrons, but they can also be positively charged. They are commonly found in ionic compounds and are formed by the transfer of electrons between atoms. Polyatomic ions are not found in molecular compounds since they are charged entities and can only form ionic bonds with oppositely charged ions.

In summary, a polyatomic ion is a group of covalently bonded atoms with a net electrical charge, and they are often negatively charged, composed of different elements, and participate in ionic bonding.

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The ATP (Available-to-Promise) for weeks 1 to 8 is the amount of inventory that a firm can commit to fulfilling customer orders within that time frame.

To calculate the ATP, you need to consider the MPS (Master Production Schedule) and the ATP calculations.

1. Start by looking at the MPS for weeks 1 to 8. The MPS represents the planned production quantities for each week.
2. Determine the beginning inventory for week 1. This is the inventory available at the start of week 1.
3. Add the MPS quantity for week 1 to the beginning inventory. This gives you the available inventory for week 1.
4. Subtract customer orders for week 1 from the available inventory. This gives you the remaining inventory after fulfilling customer orders for week 1.
5. Repeat steps 3 and 4 for each subsequent week, using the previous week's remaining inventory as the beginning inventory for the next week.
6. Continue this process until you reach week 8, calculating the available inventory and subtracting customer orders for each week.
7. The resulting values represent the ATP for weeks 1 to 8.

The ATP can fluctuate as new customer orders are received or changes are made to the MPS. Regular monitoring and adjustment of the ATP is necessary to ensure accurate order fulfillment.

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When a process occurs under constant temperature, is the enthalpy change of a process equal to the amount of heat transferred into or out of the system. Option C is correct.

According to the first law of thermodynamics, the change in internal energy (ΔU) of a system is equal to the heat transferred (q) into or out of the system plus the work done (w) on or by the system;

ΔU = q - w

For a process occurring at constant temperature (isothermal process), the internal energy remains constant (ΔU = 0). Therefore, the equation simplifies to;

0 = q - w

Since ΔU = 0 and q represents the heat transferred, the enthalpy change (ΔH) of the process is equal to the amount of heat transferred:

ΔH = q

Constant external pressure and no work done are not necessarily sufficient conditions to ensure that the enthalpy change is equal to the heat transferred. constant volume does not guarantee constant temperature, so it does not fulfill the condition for ΔH to be equal to the amount of heat transferred.

Hence, C. is the correct option.

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--The given question is incomplete, the complete question is

"Under what consition is the enthalpy change of a process equal to the amount of heat transferred into or out of the system? A. When a process occurs under constant external pressure. B. When there is no work done upon the system. C. When a process occurs under constant temperature. C. When a process occurs under constant volume. "--

The given statement "molecular orbitals (MOs) are filled in order of their energy with paired electrons having opposite spins" is TRUE because the Aufbau principles states that electrons will fill the lowest energy orbitals first before occupying higher energy orbitals.

Molecular orbitals (MOs) are formed when atomic orbitals from individual atoms overlap and combine in a molecule. They are filled according to their energy levels following the Aufbau principle, which states that electrons occupy the lowest-energy MOs available.

The Pauli Exclusion Principle states that each MO can accommodate a maximum of two electrons with opposite spins.

In a molecule, electrons first fill the lower-energy MOs before occupying higher-energy MOs. This is to minimize the molecule's overall energy, promoting stability. Whe

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Answer: …

Explanation:

The net charge on a molecule of a particular amino acid will be 1- when the pH is higher than the pI (isoelectric point) of the amino acid. In this case, the pI is 7.5, so the net charge will be 1- at a pH higher than 7.5.

The net charge on a molecule of an amino acid depends on the pH of the solution it is in. Amino acids have both acidic and basic functional groups, such as the amino group (-NH2) and the carboxyl group (-COOH). These functional groups can ionize, meaning they can either donate or accept protons depending on the pH of the solution.

The isoelectric point (pI) of an amino acid is the pH at which the net charge on the molecule is zero. At this pH, the number of positive charges (from protonated amino groups) is equal to the number of negative charges (from deprotonated carboxyl groups).

In this case, the pI of the amino acid is 7.5. Since the desired net charge is 1-, the pH must be higher than the pI. At a pH higher than 7.5, the amino acid will have a net negative charge because the carboxyl group will be deprotonated (COO-) while the amino group will remain protonated (NH3+). This results in a net charge of 1- on the molecule.

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The empirical formula of the compound is C₅H₈O₂.

Empirical formula is the simplest whole number ratio of atoms of different elements present in a compound.

The balanced chemical equation for the combustion of the compound is:

CxHyOz + (2x + y/2 - z/2) O₂ → x CO₂ + (y/2) H₂O

Molar mass of CO₂ = 44 g/mol

Molar mass of H₂O = 18 g/mol

Firstly, calculate the number of moles of CO₂ produced.

Number of moles of CO₂ produced = Mass of CO₂/Molar mass of CO₂ = 2.265/44 = 0.0515 mol

Secondly, calculate the number of moles of H₂O produced.

Number of moles of H₂O produced = Mass of H₂O/Molar mass of H₂O = 1.236/18 = 0.0687 mol

We can see from the equation, the number of moles of CO₂ produced = x number of moles of compound.

The number of moles of compound = Number of moles of CO₂ produced = 0.0515 mol

Thirdly, calculate the number of moles of H₂ produced.

Number of moles of H₂ produced = 2 × Number of moles of H₂O produced = 2 × 0.0687 = 0.1374 mol

We can see from the equation, the number of moles of H₂ produced = y/2 number of moles of compound.

The number of moles of compound = Number of moles of H₂ produced / (y/2) = 0.1374/(y/2) = 0.2748/y

Fourthly, calculate the number of moles of O present in the compound.

Number of moles of O present in the compound = (Number of moles of CO₂ produced × z/2) + (Number of moles of H₂O produced × 1) = (0.0515 × z/2) + (0.0687 × 1)

The number of moles of compound = (0.0515 × z/2) + (0.0687 × 1) = 0.0515 × z/2 + 0.0687.

Now, we have all three variables, so we can solve for them. The easiest way to solve the third equation is to assign one variable a value. We choose z = 2z/2 = 2 × 0.0515 - 0.0687 = 0.0343mol

The number of moles of C present in the compound = x = 0.0515

The number of moles of H present in the compound = y/2 = 0.2748/y

By using these calculated values, we can determine the empirical formula of the compound. Therefore, the empirical formula of the compound is C₅H₈O₂.

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The molecular formula of a compound with an empirical formula of C2H2Br3 and molar mass by the empirical formula's mass (C2H2Br3 = 12.01 * 2 + 1.01 * 2 + 79.90 * 3 = 265.74 g/mol). 531.47 g/mol ÷ 265.74 g/mol = 2 = C4H4Br6.

To find the molecular formula, we need to know the actual number of atoms in the compound. The empirical formula tells us the simplest whole-number ratio of atoms in the compound, but we also know the molar mass, which can help us determine the actual number of atoms.

First, we need to calculate the empirical formula's molar mass:
2(12.01 g/mol for C) + 2(1.01 g/mol for H) + 3(79.90 g/mol for Br) = 283.74 g/mol

We can then divide the molar mass of the compound (531.47 g/mol) by the empirical formula's molar mass to get a ratio:
531.47 g/mol / 283.74 g/mol = 1.87

This means the molecular formula must have 1.87 times the number of atoms as the empirical formula. To get a whole number, we can round to the nearest whole number, which in this case is 2. Therefore, the molecular formula is:

2(C2H2Br3) = C4H4Br6

So the answer is B) C4H4Br6.

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Answer:

1.634 molL-1

Explanation:

The mol ration between NH3 and HCl is 1 : 1

Using Ca Va / Cb Vb = Na / Nb   where a = acid and b = base

Na = 1

Nb = 1

Ca = 0.208 molL-1

Cb = ?

Va = 19.64 mL

Vb = 25.00mL

Solving for Cb

Cb = Ca Va / Vb

Cb = 0.208 * 19.64 / 25.0

Cb = 0.1634 molL-1 (Concentration of diluted ammonia solution)

Using the dilution equation;

C1V1 = C2V2

Initial Concentration, C1 = ?

Initial Volume, V1 = 25.00 mL

Final Volume, V2 =  250 mL

Final Concentration, C2 = 0.1634 molL-1

Solving for C1;

C1 = C2 * V2 / V1

C1 = 0.1634 * 250 / 25.00

C1 = 1.634 molL-1

Considering the definition of isotopes and atomic mass of an element, the atomic mass of iron is 55.9012 amu.

An isotope is a form of a chemical element in which the atoms have the same number of protons, but a different number of neutrons.

The atomic mass of an element is the weighted average mass of its natural isotopes, considering the relative abundance of each of them.

In this case, you know iron has four isotopes:

Then, the atomic mass of iron can be calculated as:

atomic mass of iron= 53.9396 amu×0.0582 + 55.9349 amu×0.9166 + 56.9354 amu×0.0219 + 57.9333 amu×0.0033

atomic mass of iron= 55.9012 amu

Finally, the atomic mass in this case is 55.9012 amu.

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Ksp (Solubility Product) is a form of equilibrium constant that is used to describe the equilibrium between a solid and its ions in a solution.

Ions are atoms or molecules which have become electrically charged by gaining or losing electrons. These charged particles are formed when neutral atoms or molecules interact with each other, such as when a metal reacts with a nonmetal.

It is calculated by multiplying the molar solubility of each ion raised to the power of its respective stoichiometric coefficient.

For example, for a generic salt AB with a molar solubility of x mol/L, Ksp is calculated as:

Ksp = (x)^(stoichiometric coefficient of A) * (x)^(stoichiometric coefficient of B)

For example, for a generic salt AB with a molar solubility of x mol/L and A having a stoichiometric coefficient of 2 and B having a stoichiometric coefficient of 3, Ksp is calculated as:

Ksp = (x)^2 * (x)^3 = x^5

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The number of Al atoms is greater than the number of Sn atoms

Given

20 gram sample of Tin and Aluminum

Required

Number of atoms

Solution

1 mol = 6.02 x 10²³ particles (atoms, molecules, ions)

So the number of atoms of each element is determined by the number of moles. The greater the number of moles the greater the number of atoms

mol = mass : Ar

mol = 20 : 118,71 u

mol = 0.168

mol = 20 : 26.9815 u

mol = 0.741

So the number of Al atoms > number of Sn atoms

Volatile organic compounds are organic chemicals that form toxic fumes.

Volatile organic compounds, or VOCs, are organic chemicals that readily vaporize at room temperature. They are emitted from a wide range of products and processes. Benzene, toluene, and xylene are examples of volatile organic compounds (VOCs). VOCs have been linked to a variety of health problems, including asthma and headaches. They can also cause irritation of the eyes, nose, and throat.

VOCs are released by a variety of sources, including paint, building materials, and household cleaning products. Gasoline, diesel fuel, and other fuels are also sources of VOCs. Many VOCs are also produced by natural sources like trees and vegetation, which is why they are present in outdoor air in addition to indoor air.

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Heat energy will transfer from the 300 K side to the 75 K side due to the difference in temperature. The barrier will prevent the heat energy from transferring back to the 300 K side, so the heat energy will remain on the 75 K side.

Heat energy is a form of energy that is produced when molecules move faster and have more kinetic energy. It is the transfer of energy from a hotter object to a cooler object and is a form of thermal energy. Heat energy is used in many everyday activities such as cooking, heating buildings, and running industrial processes. Heat energy can also be used to generate electricity by using steam turbines and other methods. Heat energy can also be used to produce mechanical energy to drive machinery. Heat energy is essential for life on earth as it helps to keep organisms warm and sustain certain chemical reactions that are vital for survival.

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Answer:

By gaining two electrons to achieve a noble gas configuration.

The first step in planning effective writing is to consider the main idea.

Considering the main idea or topic that will be discussed will help the writer to stay focused and organized throughout the writing process.

Next, the writer needs to consider the audience that will be reading their writing. Knowing who the audience is will help the writer to tailor their writing style and language to better connect with the readers.

Style is another important aspect to consider when planning writing. The style of writing can greatly impact how the message is received by the audience. The writer must choose the appropriate tone, structure, and language to convey their message effectively.

Finally, the writer needs to consider the purpose of their writing. This will help them to determine the goals and objectives of their writing and how to structure the content to achieve those goals.

In conclusion, by considering the main idea, audience, style, and purpose, the writer can better plan and execute effective writing that effectively conveys the intended message to the reader. This is why these elements are crucial when it comes to planning effective writing.

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Answer:

Electrons

Explanation:

Answer:the second largest one

Explanation:

both weels are pushing at it

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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The amount of metal plated in an electrolytic cell is directly proportional to the amount of metal plated in a voltaic cell. Therefore, if 3.70 g of metal is plated in the voltaic cell, the same amount of metal will be plated in the electrolytic cell.

In an electrolytic cell, the deposition of metal on an electrode occurs through the supply of electrical energy. The amount of metal plated in an electrolytic cell is determined by Faraday's law of electrolysis, which states that the amount of substance deposited is proportional to the quantity of electricity passed through the cell.

Given that 3.70 g of metal is plated in the voltaic cell, we can infer that the same amount of metal will be plated in the electrolytic cell. This is because the electrochemical reactions in both types of cells involve the same metal species and the same quantity of electricity passing through the cell.

Therefore, if 3.70 g of metal is plated in the voltaic cell, the same amount of metal, 3.70 g, will be plated in the electrolytic cell. The electrolytic cell allows for the controlled deposition of metal through the application of electrical energy.

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Answer:

can u show the answer it give you for the question

The float property allows the positioning of an element to the right or left of other elements.

In the context of web development and CSS, the "float" property is used to control the positioning of elements within a container. It allows you to move an element to the left or right of its containing element, enabling other elements to flow around it.

When an element is floated, it is taken out of the normal flow of the document, allowing other elements to wrap around it. This can be particularly useful for creating layouts where you want elements to appear side by side or to create text flow around images.

The "float" property can take one of two values: "left" or "right". When an element is set to "float: left", it will move to the left of its containing element, and any subsequent elements will wrap around it on the right side. Conversely, when set to "float: right", the element will move to the right, and subsequent elements will wrap around it on the left side.

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This is because side reactions and unwanted byproducts are often favored at higher temperatures.

To avoid the formation of a side product in this experiment, the best approach would be to keep the reaction at a low temperature and avoid overheating the product during distillation. This is because side reactions and unwanted byproducts are often favored at higher temperatures. By maintaining a low temperature, the reaction can be controlled to favor the desired product and minimize the formation of side products.

Drying the aqueous layer, using pure sodium iodide, using pure silver nitrate, and venting the gases out of the separatory funnel are not specifically related to preventing the formation of side products in this context. They may be relevant for other aspects of the experiment, but they would not directly address the formation of side products.

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Answer:

balanced plz give correct question

The total heat energy required is expressed according to the formula:

where:

Qvap is the heat energy absorbed by the vapor

Qw is the heat energy absorbed by the water

Get the heat energy absorbed by the vapor at 100 degrees

Given the following parameters;

Mass of water = 100g

Molar mass of water (H2O) = 18.015g/mol

Hvap,w = 2259 J/g = 40.8 kJ/mol

Substitute the given parameters into the formula to have:

Get the heat absorbed by the water from 30 to 100 degrees and from 100 to 110 degrees using the formula below. Note that the water vapor is being heated without any phase changes, so we will be utilizing the specific heat capacity of water vapor.

Get the total heat energy required;