For the equilibrium mixture:
NH4Cl(s) + heat <=> NH4+(aq) + Cl-(aq)

A) What change do you observe when you add concentrated hydrochloric acid, HCl, solution. Give complete explanation.

Answer

T = 213.15 K

Explanation

Given P = 2.5 atm

V= 3.5 L

T = ?

n = 0.50 mol

R = 0.0821 L.atm/mol.L

Required: Temperature

Solution

PV = nRT

T = PV/nR

T = (2.5 atm x 3.5 L)/(0.50 mol x 0.0821 L.atm/mol.L)

T = 213.15 K

Answer:

A. it is A. i am 80% sure it is A,

Explanation:

Answer: The reaction requires breaking one O=O bond and two H-H bonds, and then forming four O-H bonds.

Answer: you will change the atom from one element to a different element. Sometimes, when you add a proton to an element, the element will become radioactive. If you change the number of neutrons in an atom, you get an isotope of the same element.

Explanation:

Correct task : At 25°C, only 0.0140 mol of the generic salt AB3 is soluble in 1.00 L of water. What is the Ksp of this salt at 25°C.

Solution:

When the salt dissolves, it dissociates as follows:

AB3 --> A3+ + 3B⁻

--S--------S-------3S--

The molar solubility (S) is the number of moles that can dissolve in 1 L of solution.

Molar solubility of salt is (0.0140 mol) / (1.00 L) = 0.0140 mol/L.

According to the dissociation equation:

Solubility of A3+ is 0.0140 mol/L and solubility of B⁻ is 3×0.0140 mol= 0.0420 mol/L.

[A3+] = 0.0140 mol/L.

[B⁻] = 0.0420 mol/L.

Ksp is the solubility product constant and calculated as follows:

Ksp(AB3) = [A3+] × [B⁻]3

Ksp(AB3) = [0.0140] × [0.0420]3

Ksp(AB3) = 10.37×10-7.

Ksp of this salt is 1.04×10-6.

Answer: 1.04×10-6 is the Ksp of this salt at 25°C.

200 voltage does a line with a resistance of 10 ohms and a current of 20 amps posses.

The term voltage is defined as the pressure from an electrical circuit's power source that pushes charged electrons through a conducting loop, changing them to do work such as clearing a light.

voltage = pressure, and it is measured in volts (V).

Voltage can survive without current, as it is the reason of flowing charge. Current does not exist without voltage, as voltage is the main reason to flow current except theoretical superconductor.

voltage = current x resistance

Given:

resistance = 10 ohms

current = 20 amps

voltage = ?

volts = amps x ohms

= 20 × 10

= 200 V

Thus, the voltage is 200 V.

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91.2 nm is the shortest wavelength line in nanometers in series of the hydrogen spectrum when m=l and n>l

The electromagnetic radiation that a hydrogen electron emits when it transitions from an excited state to a normal state is known as the hydrogen spectrum. The wavelength of the hydrogen spectrum correlates to the energy emitted.

In order to boost electrons to higher energy levels, hydrogen molecules must first be broken into hydrogen atoms (thus the atomic hydrogen emission spectrum). Assume an electron is stimulated to the third energy level. It would probably lose energy once again if it dropped to a lower level.

As we know,

1/λ = R × (z)²× [(1/n₁)² - (1/n₂)²]

Given, it is hydrogen spectrum thus z = 1

and R = 1.097 × 10⁷ m⁻¹

n₁ = 1 and n₂ = ∞

Now,

or, 1/λ = (1.097 × 10⁷ m⁻¹) × (1)²× [(1/1)² - (1/∞)²]

or, 1/λ = 1.097 × 10⁷ m⁻¹

or, λ = 1/ 1.097 × 10⁷ m⁻¹

λ = 91.2 nm

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The two ways that a cell's part helps it make materials that it needs include mitochondria changing the energy stored in organic matter into usable forms of energy and DNA providing the instructions for making proteins. Options A and D.

Cells are able to synthesize some of what they need. The materials that cannot be synthesized by cells are obtained from the environments of cells.

One thing that every cell needs is energy. This energy is usually in the form of ATP. An organelle known as mitochondrion is responsible for the breaking of organic materials to unlock their energy and convert it to ATP that can be used by the cell.

Another material that every cell needs are proteins. Proteins are important for normal physiological processes of the cell. The DNA stores the information needed for making these proteins from amino acids.

Thus, energy synthesis by mitochondrion and protein synthesis by DNA represent two ways by which the parts of cells help them make the materials they need.

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Taking into account the reaction stoichiometry, a mass of 6.24 grams of Ba(OH)₂ are required to react with 12.2 grams of caesium phosphate.

In first place, the balanced reaction is:

3 Ba(OH)₂ + 2 Cs₃PO₄ → Ba₃(PO₄)₂ + 6 CsOH

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 987.4 grams of Cs₃PO₄ react with 504.9 grams of Ba(OH)₂, 12.2 grams of Cs₃PO₄ react with how much mass of Ba(OH)₂?

mass of Ba(OH)₂= (12.2 grams of Cs₃PO₄× 504.9 grams of Ba(OH)₂)÷ 987.4 grams of Cs₃PO₄

mass of Ba(OH)₂= 6.24 grams

Finally, a mass of 6.24 grams of Ba(OH)₂ are required.

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Density of the liquid is 0.418g/mL

The liquid sample has a volume of 0.000275 L. We can convert this to mL (because we are asked to find the density in g/mL):

mass of liquid= 0.115 grams

volume of the liquid, V= 0.000275L

Density is defined as the ratio of mass per unit volume

Now we must convert the unit of volume from L to ml as liter is SI unit which goes with Kilogram

volume in ml = 0.000275 ml/l x 1000 =0.275 ml

Density d = mass/volume

                = 0.115/ 0.275

                = 0.418 g/mL

Hence the density of the liquid is 0.418 g/mL

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The concentration of CaCl₂ is 75 % W/V. This means 75 g of the solute in 100 ml solution. Therefore, mass of calcium chloride required in 230 ml of this solution is 172.5 g.

Mass by volume percentage of a solute is term used to represent the concentration of the solution.  % W/V  of a solution is the mass of solute in grams per 100 ml of the solution.

It is given that the mass by volume percentage of the calcium chloride solution is 75% (w/v). Thus 75 g of calcium chloride is present in 100 ml of the solution.

Therefore, the mass of calcium chloride in 230 ml of this solution is calculated as follows:

mass of solute =  (230 ml  ×75 g) /100 ml

                         =  172.5 g

Hence, the mass of calcium chloride is 172.5 g.

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The balanced chemical reaction of gaseous tricarbon octahydride with oxygen gas produces gaseous carbon dioxide and water vapor is as follows: C3H8 + 5O2 → 3CO2 + 4H2O

BALANCED CHEMICAL EQUATION:

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One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns.

During El Niño years, Christchurch may experience cooler air temperatures due to several factors associated with the El Niño phenomenon.

El Niño is characterized by the abnormal warming of the surface waters in the eastern tropical Pacific Ocean, which has global climatic implications. While El Niño is primarily associated with changes in oceanic conditions, its effects can extend to atmospheric patterns, leading to altered weather patterns and temperature variations.

One possible reason for cooler air temperatures in Christchurch during El Niño years is the shift in atmospheric circulation patterns. El Niño can disrupt the normal global atmospheric circulation, resulting in changes in the positioning and intensity of weather systems.

This can lead to the advection of cooler air masses from the south or southeast towards Christchurch, resulting in cooler temperatures.

Another factor is the influence of El Niño on regional rainfall patterns. El Niño often leads to drier conditions in the South Island of New Zealand, including Christchurch.

Reduced cloud cover and less moisture in the air can contribute to cooler temperatures as there is less insulation from the sun's radiation and less evaporative cooling. Additionally, the absence of significant rainfall can result in less moisture in the soil, leading to cooler conditions as less energy is used for evaporation.

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Considering the definition of molar mass, the correct answer is option c): the mass of 1.85 moles H₂O₂ is 62.9 grams.

The molar mass of substance is a property defined as the amount of mass that a substance contains in one mole.

The molar mass of a compound is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

In this case, you know the molar mass of the elements is:

So, the molar mass of the compound H₂O₂ is calculated as:

H₂O₂= 2× 1 g/mole + 2× 16 g/mole

Solving:

H₂O₂= 34 g/mole

You can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 34 grams, 1.85 moles of the compound contains how much mass?

mass= (1.85 moles× 34 grams)÷ 1 mole

mass= 62.9 grams

Finally, the mass of 1.85 moles H₂O₂ is 62.9 grams.

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Yes, the chemical reaction occurs because new substance is formed and heat energy is released.

Chemical reaction is a process in which one or more substances i.e. the reactants, are converted to one or more different substances i.e. the products so we can conclude that the chemical reaction occurs because new substance is formed and heat energy is released.

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Answer:

D Flat Top Hills Can Be Plateaus or mesas

Explanation:

1) From the collision theory, the more the concentration of the acid, the more the acid molecules collide with the calcium carbonate causing the rate of reaction to increase.

2) If the student does grind up the calcium carbonate, the rate of reaction would increase.

We know that the rate of the reaction must have to do how quickly or slowly that reactants can be converted into products or how the products are appearing and then the reactants are disappearing.

Having said this, the keys that we need to answer the question that has been asked to us can be found in the graph that has been attached to the question. It is clear that the rate of the reaction which is the slope of the graph is increasing as the concentration of the acid is seen to increase according to the graph above.

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Answer:

1 and 2 are identical

Explanation:

Draw zigzag project

Answer:

34672.96 s

Explanation:

m = Mass of copper = 6.32 g

M = Molar mass of copper = 63.5 g/mol

F = Faraday constant = 96500 C/mol

The electrode equation would be

\(Cu^{2+}(aq)+2e^{-}=Cu(s)\)

Number of electrons = 2 = e

I = Current = 0.554 A

t = Time taken

Charge would be

\(Q=\dfrac{m}{M}eF\\\RightarrowQ=\dfrac{6.32}{63.5}\times 2\times 96500\\\Rightarrow Q=19208.82\ \text{C}\)

Charge is given by

\(Q=It\\\Rightarrow t=\dfrac{Q}{I}\\\Rightarrow t=\dfrac{19208.82}{0.554}\\\Rightarrow t=34672.96\ \text{s}\)

Time taken to deposit the copper is 34672.96 s.

The student needs to add approximately 83.3 mL of 12 M HCl solution to the existing 1 L of 2 M HCl solution to increase the concentration to 3 M. It is important to handle concentrated acids with caution and follow proper safety procedures.

To increase the concentration of a 1 L solution of 2 M HCl to 3 M, the student needs to calculate the volume of concentrated HCl needed and add it to the existing solution. Here's how the calculation can be done:

Given:

Initial concentration of HCl solution = 2 M

Final concentration desired = 3 M

Initial volume of HCl solution = 1 L

Step 1: Calculate the moles of HCl in the initial solution.

Moles of HCl = Initial concentration × Initial volume = 2 M × 1 L = 2 moles

Step 2: Calculate the moles of HCl needed for the desired concentration.

Moles of HCl needed = Final concentration × Final volume = 3 M × 1 L = 3 moles

Step 3: Calculate the moles of HCl to be added.

Moles of HCl to be added = Moles needed - Moles present = 3 moles - 2 moles = 1 mole

Step 4: Convert the moles of HCl to the required volume of concentrated HCl.

To calculate the volume, we need to know the concentration of the concentrated HCl solution. Assuming it is 12 M, we can use the following formula:

Volume of concentrated HCl = Moles of HCl to be added / Concentration of concentrated HCl

Volume of concentrated HCl = 1 mole / 12 M = 0.0833 L or 83.3 mL

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Answer:

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Explanation:

The emission of a transmitter is caused by the action of calcium ions, which also cause synaptic vesicle exocytosis, which releases the neurotransmitters inside the vesicles and starts synaptic transmission.

Nearly all bodily biological processes, including heart and muscle pulses, neurotransmission of information, memories and learning baby creation, cell proliferation, and Calcium ions enter the cytoplasm of organelles through calcium channels.

Calcium plays a critical role in the brain's regulation of synaptogenesis and memory formation. This process activates certain calmodulin signal transmission pathways and involves important protein effectors such CaMKs, MAPK/ERKs, or CREB.

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The mass of 65% and 20% nitric acid that must be mixed to produce 4.5 kg of 30% nitric acid are 1.306 kg and 3.189 kg respectively.

The volume of 4.5 kg of 30% nitric acid is determined using the formula below:

The density of 30% nitric acid is 1.18 g/mL

The mass of the  30% nitric acid is 4.5 kg or 4500 g

Hence, the volume will be:

The volume of 30% nitric acid = 4500 / 1.18

The volume of 30% nitric acid = 3813.56 mL

The volume of 65% and 20% nitric acid required is then determined.

Let the volume of the 65% and 20% nitric acid be x and y respectively;

x + y = 3813.56 ---(1)

amount of acid in 3813.56 ml solution = 30% * 3813.56

amount of acid in 3813.56 ml solution = 1144.07 mL

therefore;

60% * x + 20% * y = 1144.07 mL

0.6x + 0.2y = 1144.07 ----(2)

Solving for x and y in the two equations

From (1), x = 3813.56 - y

Substitute x = 3813.56 - y in (2)

0.6(3813.56 - y) + 0.2y = 1144.07

0.4y = 1144.07

y = 2860.18 mL
x = 3813.56 - 2860.18

x = 953.38 mL

The mass of the acids required is then determined as follows:

The density of 60% nitric acid is 1.37 g/mL

Mass of 60% nitric acid required = 953.38 mL * 1.37 g/mL

Mass of 60% nitric acid required = 1306 g or 1.306 kg

The density of 20% nitric acid is 1.115 g/mL

Mass of 20% nitric acid required = 2860.18 mL * 1.115 g/mL

Mass of 20% nitric acid required = 3189 g or 3.189 kg

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Answer:

clouds

Explanation:

Answer: 0-14

Explanation: Hope this helps

There is no reason to run these solutes at the 20 MWCO because they are both much smaller than the MWCO of the membrane.

The MWCO (molecular weight cut off) is the molecular weight of a solute at which it will be retained by a membrane during a process such as ultrafiltration or dialysis. If a solute has a molecular weight higher than the MWCO of a membrane, it will be retained and not pass through the membrane. If the molecular weight of a solute is lower than the MWCO, it will pass through the membrane.

In this case, glucose has a molecular weight of 180 g/mol (6 carbons x 12 g/mol per carbon + 6 oxygens x 16 g/mol per oxygen) and albumin has a molecular weight of approximately 81,942 g/mol (607 amino acids x 135 g/mol per amino acid). Both of these solutes have molecular weights that are much lower than 20,000 g/mol, which is a typical MWCO for ultrafiltration or dialysis membranes.

They would both easily pass through the membrane and be lost during the process. Instead, a membrane with a much lower MWCO would be needed if we wanted to retain these solutes during a process such as ultrafiltration or dialysis.

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Answer:

Largest: Mg

Smallest: Cl

Explanation:

If 8.2 moles of Mg are burned, the number of moles of O₂ consumed is 4.1 moles.

Stoichiometry refers to the quantitative relationship between the reactants and products of a specific reaction or equation.

According to this question, magnesium reacts with oxygen to produce magnesium oxide as follows:

2Mg + O₂ → 2MgO

Based on the above equation, 2 moles of magnesium reacts with 1 mole of oxygen gas

This means that 8.2 moles of magnesium will react with 8.2 × ½ = 4.1 moles of oxygen gas.

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