Which reactant (X) is missing from the equation shown?
X+ PO4 → H3PO4

Answer: 76400cm

Explanation:

When the carbonic acid sodium bicarbonate buffer pair buffers lactic acid, the following reaction occurs:$$\text{HCO}_3^- + \text{H}^+ \leftrightarrow \text{H}_2\text{CO}_3$$The carbonic acid/bicarbonate buffer system is one of the most important in human blood. When the pH of the blood decreases (becomes more acidic), the amount of bicarbonate ions in the blood decreases, and the concentration of hydrogen ions increases.

A buffer is a solution of a weak acid and its conjugate base that prevents changes in pH when small amounts of strong acid or base are added. Buffer systems protect organisms from pH changes by regulating and neutralizing acids and bases that enter or are produced by cells.

When the carbonic acid sodium bicarbonate buffer pair buffers lactic acid, the following reaction occurs:$$\text{HCO}_3^- + \text{H}^+ \leftrightarrow \text{H}_2\text{CO}_3$$The carbonic acid/bicarbonate buffer system is one of the most important in human blood. When the pH of the blood decreases (becomes more acidic), the amount of bicarbonate ions in the blood decreases, and the concentration of hydrogen ions increases. To balance the excess hydrogen ions, carbonic acid (H2CO3) is formed from carbon dioxide (CO2) and water (H2O). Carbonic acid then decomposes to form bicarbonate ions and hydrogen ions, and the pH of the blood is returned to normal. The bicarbonate ions act as a base, neutralizing the excess hydrogen ions that cause the blood to become more acidic. This is called the bicarbonate buffer system. Lactic acid is produced during intense exercise when the body doesn't get enough oxygen to meet its energy needs. The buildup of lactic acid in muscles can cause fatigue and muscle soreness. The carbonic acid/bicarbonate buffer system can also help to buffer the excess lactic acid produced during exercise, preventing the blood from becoming too acidic.

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Answer: we know that 10 g of naphthalene is added to a test tube.  We determined and the cooling curve above that the freezing point of naphthalene is approximately 80.5  degreesC  .  We then add 1.1  g   of p-dichlorobenzene to the test tube.

Explanation:

Okay, let's solve this step-by-step without using quadratics:

1) The equilibrium constant Kc = 0.36 means the equilibrium lies to the left. So there will be more N2O4 than NO2 at equilibrium.

2) The initial concentration of N2O4 is 0.1 mol dm^-3. Let's call this [N2O4]initial.

3) At equilibrium, the concentrations of N2O4 and NO2 will be [N2O4]equil and [NO2]equil respectively.

4) We know the equilibrium constant expression for this reaction is:

Kc = ([NO2]equil)^2 / [N2O4]equil

5) Setting this equal to 0.36 and plugging in 0.1 for [N2O4]initial, we get:

0.36 = ([NO2]equil)^2 / (0.1 - [NO2]equil)

6) Simplifying, we get:

0.036 = [NO2]equil^2

7) Taking the square root of both sides, we get:

[NO2]equil = 0.06 mol dm^-3

So the equilibrium concentration of NO2 is 0.06 mol dm^-3.

Let me know if you have any other questions! I can also provide a more step-by-step explanation if needed.

Explanation:

RFM=98g

1mol=6.022x10^23molecules

1mol=RFM

98g H2SO4=6.022x10^23molecules

24.0g H2SO4=?

24×6.022×10^23/98

=1.475×10^23 molecules

Sulfur (S): -2, Bromine (Br): -1, Iodine (I): -1, Lithium (Li): +1, Strontium (Sr): +2, Magnesium (Mg): +2, Sodium (Na): +1, Cesium (Cs): +1, Barium (Ba): +2, Fluorine (F): -1, Oxygen (O): -2.

Charges are based on gaining or losing electrons to achieve stable electron configurations.

We have,

To determine the charge of the common ion formed by each of these atoms, you need to consider their position on the periodic table and their tendency to gain or lose electrons to achieve a stable electron configuration.

Sulfur (S): -2 (gains 2 electrons to form S²⁻)

Bromine (Br): -1 (gains 1 electron to form Br⁻)

Iodine (I): -1 (gains 1 electron to form I⁻)

Lithium (Li): +1 (loses 1 electron to form Li⁺)

Strontium (Sr): +2 (loses 2 electrons to form Sr²⁺)

Magnesium (Mg): +2 (loses 2 electrons to form Mg²⁺)

Sodium (Na): +1 (loses 1 electron to form Na⁺)

Cesium (Cs): +1 (loses 1 electron to form Cs⁺)

Barium (Ba): +2 (loses 2 electrons to form Ba²⁺)

Fluorine (F): -1 (gains 1 electron to form F⁻)

Oxygen (O): -2 (gains 2 electrons to form O²⁻)

Charges are determined based on the number of valence electrons and the tendency to gain or lose electrons to achieve a full valence electron shell. Metals tend to lose electrons to form positive ions (cations), while non-metals tend to gain electrons to form negative ions (anions).

Thus,

Sulfur (S): -2, Bromine (Br): -1, Iodine (I): -1, Lithium (Li): +1, Strontium (Sr): +2, Magnesium (Mg): +2, Sodium (Na): +1, Cesium (Cs): +1, Barium (Ba): +2, Fluorine (F): -1, Oxygen (O): -2.

Charges are based on gaining or losing electrons to achieve stable electron configurations.

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The complete question:

What is the charge of the common ion formed by each of these atoms? Either -2,-1,+1, or +2.

S, Br, I, Li, Sr, Mg, Na, Cs, Ba, F, and O

How are these changes found?

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Chemists use the mole unit to represent 6.022 × 10 23 things, whether the things are atoms of elements or molecules of compounds. This number, called Avogadro's number, is important because this number of atoms or molecules has the same mass in grams as one atom or molecule has in atomic mass units.

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There are several polymers that can generate a polyelectrolyte when dissolved in water at a pH of 7. Examples of such polymers include poly(acrylic acid), poly(styrene sulfonate), and poly(vinyl alcohol).

A polymer that would generate a polyelectrolyte when dissolved in water at pH=7 is poly(acrylic acid) (PAA).
Here's the step-by-step explanation:
1. Poly(acrylic acid) is a polymer consisting of repeating units of acrylic acid.
2. When PAA is dissolved in water at pH=7, the acidic carboxyl groups (-COOH) present in the acrylic acid units ionize, losing a hydrogen ion (H+).
3. This ionization results in the formation of negatively charged carboxylate groups (-COO-) on the polymer chain.
4. The presence of these charged groups along the polymer chain classifies PAA as a polyelectrolyte, as it carries an electric charge when dissolved in a solvent like water.

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The partial pressure of hydrogen is 473.25 mm of Hg.

What is Dalton s law?

Dalton’s Law, also known as Dalton’s Law of Partial Pressures, states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the individual gases. This law was proposed by English chemist John Dalton in 1801. In a mixture of gases, each gas has an individual pressure, and the total pressure is the sum of the pressures of each of the gases. This law is based on the fact that each gas in a mixture behaves independently of the other gases, and that the total pressure of the mixture is equal to the sum of the partial pressures of each gas. The partial pressure of a gas is determined by the concentration of the gas in the mixture and the total pressure of the mixture.

Pi = Xi Pt
partial pressure of gas = mole fraction of that gas × total pressure
2NH3 ⇒N2+ 3H2
mole fraction of hydrogen =3/4 = 0.75
partial pressure of H2 = 0.75×631 mm of Hg = 473.25 mm of Hg.
(1 mm of Hg = 1 torr)

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The 4-methyl pentane-2-ol (\(C_6H_{14}O\)) is an alcohol compound with a methyl group attached to the fourth carbon atom and a hydroxyl group attached to the second carbon atom in a five-carbon chain.

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The smallest particle of a compound that still has the compound's properties is called a Molecule.

A molecule is a collection of two or more atoms held together by the attractive forces known as chemical bonds. When speaking of polyatomic ions, the distinction between them and ions is frequently ignored in the fields of quantum physics, organic chemistry, and biochemistry. A molecule can be heteronuclear, which is a chemical compound made up of more than one element, such as water, or homonuclear, which is a molecule made up of atoms of one chemical element, such as the two atoms in the oxygen molecule (O2) (two hydrogen atoms and one oxygen atom; H2O). The term "molecule" is frequently used to refer to any gaseous particle, regardless of its composition, in the kinetic theory of gases.As the noble gases are single atoms, the requirement that a molecule comprise two or more atoms is relaxed. Often, single molecules do not include atoms and complexes joined by non-covalent interactions like hydrogen bonds or ionic bonds.

There are lots of molecules in matter. Most of the oceans and atmosphere are also made up of them. The majority of organic compounds are molecules. Molecules such as proteins, the amino acids that make them up, nucleic acids (DNA and RNA), sugars, carbohydrates, lipids, and vitamins are examples of the constituents of life. The nutrition minerals, such as iron sulphate, are often ionic compounds rather than molecules.

On Earth, however, the vast majority of known solids are composed entirely or mostly of molecules-free crystals or ionic compounds. All the minerals that make up the Earth's composition, as well as sand, clay, pebbles, rocks, boulders, bedrock, the molten interior, and the Earth's core, are among them. Each of these has several chemical linkages, but are not made of identifiable molecules.

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Answer:

Endangered species .............................

Answer:

Fahrenheit and Celsius

Explanation:

The main causes of the Grevy's zebra population decrease are habitat degradation, competition for resources with domestic livestock, and hunting for their skins and meat.

The main factor contributing to the decrease of Grevy's zebras in Ethiopia is hunting. Although their striking skins are the main reason they are hunted, they are also rarely slain for food and, in some areas, for medicinal purposes.

Zebras from Grevy's are in peril. Grevy's zebras have experienced one of the greatest range reductions of any African animal, and are now restricted to northern Kenya and southern and eastern Ethiopia. They are no longer residing in Somalia, Eritrea, Djibouti, and it's possible that they've left Sudan as well.

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Ether solvents are necessary for Grignard reactions because they provide a highly polar environment that enables the formation of the Grignard reagent.

A polar environment is a type of environment characterized by extreme cold, low temperatures, and very little precipitation. It is found in the regions around the Earth’s poles and includes the Arctic and Antarctic regions. Temperatures in polar environments can range from -60°C to as low as -90°C.

The Grignard reagent is a very reactive species and requires a solvent that can provide a non-nucleophilic environment. Ethers are particularly suitable for this purpose, as they have an oxygen atom that can interact with the magnesium, and their non-polar nature helps to stabilize the Grignard reagent. Additionally, ether solvents are relatively unreactive, which greatly reduces the possibility of side reactions.

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The typical 1H-NMR chemical shift for methyl protons adjacent to ether oxygen is in the range of 3.3-3.7 ppm. This chemical shift range is consistent across a variety of different types of ethers, including cyclic ethers and alkyl ethers.

Due to the nearby ether oxygen's ability to remove electrons, this chemical shift range develops. The alkyl chain's carbon atoms are more electronegative than the oxygen atom, which has a deshielding impact on the methyl protons. The protons thus encounter a stronger magnetic field, which raises the chemical shift value.

It's important to keep in mind that the methyl protons' chemical shift can be influenced by the ether oxygen's chemical surroundings. The chemical shift, for instance, might alter slightly if the ether oxygen is a component of a larger functional group, like a carboxylic acid or an ester, because of the additional electrical effects of that group. However, typically, the 3.3–3.7 ppm chemical shift range is a good starting point for predicting the chemical shift of methyl protons adjacent to ether oxygen.

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Adjusting the temperature program and modifying the carrier gas flow rate can improve the resolution in a gas chromatography analysis without changing columns or instruments.

To improve the resolution in a gas chromatography (GC) analysis when the peak separation is mediocre, there are two adjustments that can be made in the operating parameters: adjusting the temperature program and modifying the carrier gas flow rate.

Temperature Program: The temperature program refers to the temperature profile used during the GC analysis. By optimizing the temperature conditions, better resolution can be achieved. One adjustment is to increase the initial temperature to improve peak separation at the beginning of the analysis. Another approach is to change the temperature ramp rate or the final temperature to enhance separation towards the end of the analysis. Fine-tuning the temperature program can help achieve better resolution between the components.

Carrier Gas Flow Rate: The carrier gas flow rate can significantly impact the resolution in GC analysis. By adjusting the flow rate, the retention times of the components can be altered, leading to improved peak separation. Lowering the flow rate generally increases the retention time, allowing for better separation. However, it is essential to find the optimal flow rate that balances resolution and analysis time. Modifying the carrier gas flow rate can help achieve better resolution and separation of the components.

By making these adjustments in the operating parameters, specifically optimizing the temperature program and modifying the carrier gas flow rate, it is possible to improve the resolution in GC analysis without the need to change columns or instruments. These adjustments allow for enhanced separation and more accurate quantification of the target components.

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Some NaNO₃ may not fully dissociate when dissolved in a solution due to factors such as limited solubility, presence of other ions, and temperature.

The dissociation of NaNO₃ in solution depends on its solubility and the conditions of the solution. NaNO₃ is generally highly soluble in water, meaning that it readily dissociates into Na+ and NO3- ions. However, there are instances where not all of the NaNO₃ will dissociate completely.

One factor that can limit the dissociation of NaNO₃ is its solubility. If the concentration of NaNO₃ in the solution exceeds its maximum solubility, a portion of the NaNO₃ may remain undissolved and not dissociate into ions dissolution.

Additionally, the presence of other ions in the solution can affect the dissociation of NaNO₃. Common ions in the solution, such as H+, OH-, or other cations and anions, can interact with the Na+ and NO₃- ions, forming compounds that are less soluble or stable. This can reduce the overall dissociation of NaNO₃.

Temperature can also play a role in the dissociation of NaNO₃. Higher temperatures generally increase the solubility and dissociation of salts, including NaNO₃. However, at lower temperatures, the solubility and dissociation may be reduced.

In conclusion, limited solubility, presence of other ions, and temperature are factors that can affect the complete dissociation of NaNO₃ in a solution, leading to some of the NaNO₃ remaining undissociated.

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The standard heat of formation of a free element in its standard state is always zero.

The standard heat of vaporization is the change in enthalpy that occurs when one mole of a compound is formed from its constituent elements in their standard states, at a pressure of 1 atm and a temperature of 25°C. However, when a free element is in its standard state (i.e., in its most stable form at 1 atm and 25°C), it is not formed from its constituent elements, so its standard heat of formation is defined to be zero.

Here,

The standard heat of formation of oxygen gas (O2) is zero, because oxygen in its most stable form at 1 atm and 25°C is already in the form of O2 molecules. Similarly, the standard heat of formation of carbon in its standard state (as graphite) is zero, because graphite is the most stable form of carbon at 1 atm and 25°C.

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The correct formula for Copper II Phosphate is Cu3(PO4)2.

Copper II Phosphate is an ionic compound that is formed by the reaction between Copper (II) cation (Cu2+) and Phosphate anion (PO43-). The Copper (II) cation has a 2+ charge, and the Phosphate anion has a 3- charge. To balance the charges, we need three Copper (II) cations for every two Phosphate anions, which gives us the formula Cu3(PO4)2. The other options provided in the question, i.e., Cu2PO3, Cu(PO4)2, Cu(PO3)2, and Cu2PO4, do not represent the correct formula for Copper II Phosphate.

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False. Lipids are hydrophobic, which means they do not dissolve in water. This is because lipids are non-polar molecules and water is a polar solvent.

However, lipids can dissolve in other non-polar solvents such as oils and fats.
False. Lipids are actually hydrophobic, meaning they do not dissolve in water. Hydrophilic substances, on the other hand, do dissolve in water.

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Answer:

Physical therapists evaluate and record a patient's progress. Physical therapists help injured or ill people improve movement and manage pain. They are often an important part of preventive care, rehabilitation, and treatment for patients with chronic conditions, illnesses, or injuries.

Answer:

Physical therapists evaluate and record a patient's progress. Physical therapists help injured or ill people improve movement and manage pain. They are often an important part of preventive care, rehabilitation, and treatment for patients with chronic conditions, illnesses, or injuries. Physical therapists (PTs) often ask patients to use exercise equipment like bikes and treadmills. A PT also may treat the affected area with heat or cold, electrical stimulation, ultrasound, massage, and even aquatic therapy (exercise in a swimming pool). all physical therapists must hold a Doctorate of Physical Therapy degree to practice professionally. So, yes, a physical therapist is a doctor with the training and credentials to practice their medical specialty safely and effectively.

Answer: Nuclei combine to form a heavier nucleus, releasing energy. ​

Explanation:   e.g two deuterium nucleus (Hydrogen-2 isotopes) forms an He nucleus and energy is released.

Nuclear fusion is when nuclei combine to form heavier nuclei, releasing energy.

Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles (neutrons or protons). The difference in mass between the reactants and products is manifested as either the release or absorption of energy.

The release of energy with the fusion of light elements is due to the interplay of two opposing forces: the nuclear force, a manifestation of the strong interaction, which holds protons and neutrons tightly together in the atomic nucleus; and the Coulomb force, which causes positively charged protons in the nucleus to repel each other.

Nuclear fusion is also observed in stars.

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Answer: The anwser is A a photon was realeased please mark brainliest

Explanation:

There will be produced 0.250 moles of \(N_{2}\) and 1 mol of \(H_{2} O\)

\(H_{2} O_{2}\) is the limiting reactant

There will remain 0.450 moles of \(N_{2} H_{4}\)

Number of moles of \(N_{2} H_{4}\) = 0.7 moles

Number of moles \(H_{2} O_{2}\) = 0.500 moles

Molar mass of \(N_{2} H_{4}\) = 32.05 g/mol

Molar mass of \(H_{2} O_{2}\) = 34.01 g/mol

Step 2: The balanced equation

\(N_{2} H_{4}\) + 2\(H_{2} O_{2}\) → \(N_{2}\) + 4\(H_{2} O\)

Step 3: Calculate the limiting reactant

For 1 mol of \(N_{2} H_{4}\) we need 2 moles of \(H_{2} O_{2}\) to produce 1 mol of \(N_{2}\) and 4 moles of \(H_{2} O\)

\(H_{2} O_{2}\) is the limiting reactant. It will completely be consumed. (0.500 moles).

\(N_{2} H_{4}\) is in excess. There will react 0.500/2 = 0.250 moles of \(N_{2} H_{4}\)

There will remain 0.700 - 0.250 moles = 0.450 moles of \(N_{2} H_{4}\)

Step 4: Calculate moles of products

For 1 mol of \(N_{2} H_{4}\) we need 2 moles of \(H_{2} O_{2}\)  to produce 1 mol of \(N_{2}\) and 4 moles of \(H_{2} O\)

For 0.500 moles of \(H_{2} O_{2}\). we'll have 0.250 moles of \(N_{2}\) and 1 mol of \(H_{2} O\)

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Answer:

58.33 g/mol

Explanation:

Answer:

1

Explanation:

if 33 the answer would be 92 but u think then 92 32 1