Iodine-131 is a radioactive isotope, and is often used in certain medical treatments. It has a short half-life of about 8 days. If a hospital has a 750mg sample of it available, how much would be available after 48 days?

Answer:?

?Explanation:

The gas law applicable in the given scenario is Gay-Lussac's Law. Therefore, the correct option is option 4. The final temperature of the gas is 239.72 K.

The gas law that applies to the given scenario is Gay-Lussac's Law. This law states that at a constant volume, the pressure of a gas is directly proportional to its temperature. Therefore, if the pressure of the gas decreases from 18.0 atm to 14.0 atm, we can infer that the temperature of the gas will also decrease.

To calculate the final temperature of the gas, we can use the Gay-Lussac's Law formula:

(P1/T1) = (P2/T2)

where P1 and T1 are the initial pressure and temperature of the gas, and P2 and T2 are the final pressure and temperature of the gas.

Substituting the given values, we get:

(18.0 atm/308.15 K) = (14.0 atm/T2)

Solving for T2, we get:

T2 = (14.0 atm x 308.15 K) / 18.0 atm

T2 = 239.72 K

Therefore, the final temperature of the gas would be 239.72 K or -33.43*C (using the Celsius to Kelvin conversion formula). Hence, the correct answer is option 4.

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The amount of excess acetic anhydride is:Amount of excess acetic anhydride = initial amount - amount used = 0.0196 mol - 0.0145 mol = 0.0051 molTherefore, 0.0051 mol of acetic anhydride is used in the reaction.

The balanced chemical equation for the reaction of salicylic acid with acetic anhydride is given as follows: 2C7H6O3 + C4H6O3 ⟶ 2C9H8O4 + H2OIn this equation, salicylic acid (C7H6O3) is the limiting reagent and acetic anhydride (C4H6O3) is the excess reagent. The stoichiometric ratio between salicylic acid and acetic anhydride is 2:1. This means that for every two moles of salicylic acid, one mole of acetic anhydride is required. To find out how much of the excess reactant is used when the reaction is complete, we need to determine the limiting reagent and the excess reagent. We can do this by calculating the amount of product that each reactant can produce and comparing the values.Let's first calculate the number of moles of each reactant:No. of moles of salicylic acid = mass/molar mass = 2/138 = 0.0145 molNo. of moles of acetic anhydride = mass/molar mass = 2/102 = 0.0196 molTo determine the limiting reagent, we need to calculate the amount of product that each reactant can produce.

According to the balanced equation, 2 moles of salicylic acid produces 2 moles of aspirin, while 1 mole of acetic anhydride produces 2 moles of aspirin. Therefore, the amount of aspirin that can be produced from each reactant is as follows : Amount of aspirin produced from salicylic acid = 2 x 0.0145 mol = 0.0290 molAmount of aspirin produced from acetic anhydride = 2 x 0.0196 mol = 0.0392 molSince salicylic acid can produce only 0.0290 mol of aspirin, it is the limiting reagent. This means that acetic anhydride is in excess. To determine how much of the excess reactant is used, we need to subtract the amount of acetic anhydride used from the amount that was initially present. The amount of acetic anhydride used is equal to the amount of salicylic acid used, which is 0.0145 mol.

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Answer: Group 18, non-reactive noble gas

Explanation:

This electron configuration denotes the elements Argon. It is at the end of the 3p subshell and we can tell this because it says 6 for the value in 3p. This element is in group 18 and something important about that group is that they are typically non-reactive gases, because they have a full electron shell.

Group 18

non-reactive noble gas

The structure of the acetyl-CoA is -[SEE aatachemt]

The structure of the malonyl-CoA is -[SEE aatachemt]

The structure of the palmitic acid is -[SEE aatachemt]

So from comparing all the three structures, it is evident that the terminal carbon with attached O= will be the suitable carbon to radiolabel the malonyl-CoA as this carbon will remain in the resultant palmitate molecule to trace down.

A crucial intermediary metabolite in the synthesis of fatty acids is malonyl-CoA. Malonyl-coenzyme A (CoA) is the substrate that serves as the main carbon source for the synthesis of palmitate (C16), which is catalyzed by fatty acid synthase, in de novo fatty acid synthesis.

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Answer:

Subconscious - psychic activity just below the level of awareness

Election - the act of electing someone

Explanation:

I hope this helped enough, good luck in chemistry!

7. The pH of water is pH7.

The pH scale measures the acidity or alkalinity of a substance. It ranges from 0 to 14, with pH7 considered neutral. Water has a pH of 7, indicating that it is neither acidic nor basic. It is important to note that the pH of pure water can vary slightly due to the presence of dissolved gases and minerals, but it generally remains close to pH7.

8. When fish die from pollution, the pH is typically around pH4.

Pollution can introduce harmful substances into water bodies, leading to a decrease in pH. Acidic pollutants, such as sulfur dioxide and nitrogen oxides, can cause the pH of water to drop significantly. When fish are exposed to highly acidic water, their physiological processes are disrupted, and they may die as a result. A pH of around pH4 is considered highly acidic and can be detrimental to aquatic life.

9. A solution with a pH less than 7 is acidic.

This statement is false. A solution with a pH less than 7 is actually considered acidic, not basic. The pH scale ranges from 0 to 14, with pH7 being neutral. Solutions with a pH below 7 are acidic, indicating a higher concentration of hydrogen ions (H+) in the solution. On the other hand, solutions with a pH above 7 are basic or alkaline, indicating a higher concentration of hydroxide ions (OH-) in the solution.

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To convert milliliters (mL) to liters (L), you need to divide the milliliter value by 1000, as there are 1000 milliliters in one liter.

Here's the formula for converting milliliters to liters:

Liters = Milliliters / 1000

For example, if you have 5000 milliliters, the conversion to liters would be:

Liters = 5000 mL / 1000 = 5 L

So, 5000 milliliters is equivalent to 5 liters.

The species that acts as a catalyst is BrO

In the given two-step mechanism for the decomposition of ozone in the stratosphere:

Step 1: BrO3 → BrO + O2
Step 2: BrO + O → Br + O2

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. In this mechanism, BrO is formed in step 1 but is then regenerated in step 2, allowing it to participate in the reaction again and again. Thus, BrO acts as a catalyst in this mechanism.

A substance known as a catalyst is one that, without being consumed during the reaction, accelerates or reduces the temperature or pressure required to initiate a chemical reaction.

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The point B is the diagram in which it has the Highest maximum energy level shown Here For the reaction of 2-methylpropene with hydrogen chloride.

The least strong conformation is the eclipsed conformation in which the methyl and the hydrogen atom are gift near every different and enjoy pressure repulsion on every different.

This ends in steric difficulty and makes the molecule unstable.Isobutylene (or 2-methylpropene) is a hydrocarbon with the chemical formula (CH3)2C=CH2. It is a 4-carbon branched alkene (olefin), one of the 4 isomers of butylene.2−methyl propene is greater reactive with HCl than propene as the +I impact of methyl businesses makes double bond greater electron wealthy and for the duration of electrophilic addition, a tertiary carbocation intermediate is received that's greater strong than secondary carbocation intermediate.

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Answer:

a 0.22L

Explanation:

Answer:

A

Explanation:

1 moles of oxygen is 0.044L

Answer:

true

Explanation:

cause thereare both in liquid form

Answer:

a.N

b.Al

Explanation:

nitogen is N in upper case and aluminium is Al.always the second letter is lower case

Diluting a solution does affect the pH, but not the way one might expect

Diluting a solution does affect the pH, but not the way one might expect. The pH of a solution is defined as the negative logarithm of the hydrogen ion concentration [H+], so as the concentration of hydrogen ions changes, the pH changes as well. However, when a solution is diluted, the concentration of hydrogen ions remains the same, while the concentration of all other ions and molecules in the solution decreases proportionally. This means that the pH of the diluted solution remains the same as the original solution. For example, if a solution has a pH of 3 and is diluted by a factor of 10, the [H+] concentration will remain the same, but the concentration of all other species in the solution (e.g., buffer molecules) will decrease by a factor of 10. Therefore, the pH will remain at 3.

In summary, diluting a solution does not affect the pH, but rather, it changes the concentration of all species in the solution proportionally, while the hydrogen ion concentration and thus the pH remain constant

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Answer:

1 to 5 days

Explanation:

A redox reaction is when there is simultaneous oxidation and reduction. CuO+H2→Cu+H2O. Example: In this reaction, hydrogen is oxidised to water while copper oxide is reduced to copper.

By assuming that all bindings to the atoms in molecules are ionic, we can use the oxidation numbers assigned to atoms in molecules to detect redox reactions. In a reaction, oxidation is shown by an increase in the number of oxidations, and reduction is indicated by a copper. Consider the sodium-water reaction. In this reaction, sodium removes hydrogen from water while both becoming oxidised by obtaining oxygen and reducing the water to hydrogen by removing oxygen at the same time.

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The reaction Al + NaCl → AlCl₃ + Na among the given reactions will not occur according to the reactivity series. Therefore, option B is correct.

The reactivity series of metals can be described as the arrangement of metals in the decreasing order of their reactivities.

The metals at the top of the activity series are strong reducing agents as they can easily oxidize. These metals easily corrode. The reducing ability gets weaker moving down the series.

The electropositive elements reduce as move down the activity series of metals. All metals above hydrogen in the reactivity series emit hydrogen gas upon reacting with dilute HCl.

Aluminum metal lies down to the sodium metal so it can not displace sodium metal therefore, this reaction is not possible.

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There are approximately 5.418 x 10^23 atoms in 0.30 moles of sulfur dioxide (SO2) gas.

To find out how many atoms are in 0.30 moles of sulfur dioxide (SO2), we need to first determine the number of molecules and then find out the total number of atoms.

A mole is a unit that represents 6.022 x 10^23 entities (atoms, molecules, ions, etc.) of a substance. This number is called Avogadro's number.

Determine the number of SO2 molecules in 0.30 moles:

Calculate the total number of atoms in the SO2 molecules:

Each molecule of sulfur dioxide (SO2) consists of one sulfur atom and two oxygen atoms. Thus, there are three atoms per SO2 molecule.

So, there are approximately 5.418 x 10^23 atoms in 0.30 moles of sulfur dioxide (SO2) gas.

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Answer:

There are many ways to figuring this out: you could use a ruler, a calculator or scrap paper.

Explanation:

This is not an actual flat out answer, but it’s helpful methods to getting the answer the next time you are stuck. Hope you are having a nice day. Bless your heart and soul.

moles of oxygen: 1/2 x moles of water

= 1/2 x 7.8 = 3.9

Answer:

option B on e2020

Explanation:

I did the test

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. The air particles keeps on moving constantly at high speeds. The correct option is option B.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

The distance between atoms of air is very large, they do Brownian motion. These atoms are not at fixed position. They keep on moving at high speed with high kinetic energy.

Therefore, the air particles keeps on moving constantly at high speeds. The correct option is option B.

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Answer:

give other guy brainliest

Answer:El mercantilismo en Gran Bretaña consistió en la posición económica de que, para aumentar la riqueza, sus colonias serían proveedoras de materias primas y exportadoras de productos terminados. El mercantilismo provocó muchos actos de lesa humanidad, incluida la esclavitud y un sistema de comercio desequilibrado.

Explanation:

Concentration refers to the amount of substance present.

The term concentration refers to the amount of substance present. There are many units that could be used for concentration of a solution. This makes reference easy.

To express the concentration in milligram per liter;

45/1000/1 L = 0.045 mg/L

To express the concentration in molarity;

Number of moles = mass/molar mass = 45.00 g /106 g/mol = 0.42 moles

Molarity = 0.42 moles/1 L = 0.42 M

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The Unsaturated alkene describes the molecule shown below.so, option (a) is correct.

What is Unsaturated alkene ?

Unsaturated hydrocarbons are organic substances that are only composed of carbon and hydrogen atoms and have two or three bonds between two neighbouring carbon atoms.

Since alkene molecules contain a carbon-carbon double bond, which causes them to exhibit distinctive addition reactions, alkenes are also known as unsaturated hydrocarbons.

What is molecule ?

A molecule is a collection of at least two chemically bound atoms from the same or distinct elements. One molecule of water, for instance, is created when two hydrogen atoms and one oxygen atom combine.

Therefore, Unsaturated alkene describes the molecule shown below.so, option (a) is correct.

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Learn the concentration and beginning rate in order to determine the correct number of significant digits. The starting rate of reaction is 98.0 m/s at a specific concentration of h2 and i2.

What, using an example, is concentration?

1) Percent Concentration:

The amount of solute that completely dissolves in 100 g of solvent. We know that there are 20 g of solute in 100 g of solution if the solution's concentration is 20 percent. Example: The solution is made by combining 10 g of salt with 70 g of water. Find the solution's concentration using mass percent.

What would you say about concentration?

The amount of solute contained in a specific amount of solution is the substance's concentration. Typically, concentrations are described in terms of molarity, which is the number of

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The lipoproteins LDL and HDL are thought to influence heart disease risk because LDL is contributing to the formation of plaques and atherosclerosis, while HDL helps remove cholesterol from the arteries.

LDL (low-density lipoprotein) and HDL (high-density lipoprotein) are two types of lipoproteins involved in the transport of cholesterol in the bloodstream. They play a significant role in influencing heart disease risk due to their distinct functions and effects on cholesterol metabolism.

1. LDL: it is often referred to as "bad cholesterol" because it carries cholesterol from the liver to peripheral tissues, including arterial walls. High levels of LDL in the bloodstream can lead to the deposition of cholesterol in arterial walls, contributing to the formation of plaques. These plaques can narrow the arteries and restrict blood flow, a condition known as atherosclerosis. If a plaque ruptures, it can trigger the formation of blood clots, potentially leading to a heart attack or stroke.

2. HDL: HDL, on the other hand, is often referred to as "good cholesterol" due to its beneficial effects on heart health. HDL transports cholesterol from peripheral tissues, including arterial walls, back to the liver for metabolism and elimination. It acts as a scavenger, removing excess cholesterol from the arteries and transporting it away, which can help prevent the buildup of plaques. HDL also possesses anti-inflammatory and antioxidant properties, which further contribute to its protective effect against heart disease.

The balance between LDL and HDL levels in the bloodstream is an essential factor in assessing heart disease risk. High levels of LDL and low levels of HDL are associated with an increased risk of developing atherosclerosis and heart disease. Conversely, higher levels of HDL and lower levels of LDL are generally considered favorable for heart health.

LDL and HDL lipoproteins influence heart disease risk because LDL is associated with the deposition of cholesterol in arterial walls, contributing to atherosclerosis, while HDL helps remove cholesterol from the arteries and has a protective effect. Maintaining a healthy balance between LDL and HDL levels is crucial for reducing the risk of heart disease.

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Answer:

17.78 gm

Explanation:

2 H20 mole weight = 36 gm

   which leads to 32 gm   O2

36 / 32   =  20 / x      x = 17.78 gm

Answer:

C

Explanation:

Water freezes from the TOP DOWN. An example can be when you take the ice thingy container and when you pour water into it to form an ice cube for your drink leave it for a couple of minutes, it’ll freeze from the top and it can be easily break when u compress on it by your finger.

A is possible. But, it’s wrong.

In addition, the density of water is more than ice. Which allows the ice float ontop of the water.

Option B is incorrect.

When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands. (When water reaches 0 °C it turns into an ice cube so, the ice cube has a higher volume than water)

C is possible, too.

D is wrong.