What is the molarity of the solution made by dissolving 15.1 g of solid naf in water and diluting it to a final
volume of 550.0 ml?

By dividing the amount of half-lives by the time it took for two half-lives to pass (3.04 hours), we can determine the half-life of silver-112. (2). This gives us a silver-112 half-life of 1.52 hours.

The half-life of a radioactive isotope is defined as the amount of time it takes for half of the initial amount of the isotope to decay. To determine the half-life of silver-112, we can use the information given in the problem.

We know that 28.0% of a sample of silver-112 decays in 1.52 hours. Let's assume that we started with a sample of 100 silver-112 atoms. This means that 28.0 of these atoms would decay in 1.52 hours, leaving us with 72.0 atoms remaining.

After another half-life, we would expect half of the remaining atoms to decay. In other words, we would expect 36.0 atoms to decay, leaving us with 36.0 atoms remaining. Since we started with 100 atoms and now have 36.0 remaining, this means that two half-lives have passed.

Therefore, we can calculate the half-life of silver-112 by dividing the time it took for two half-lives to pass (3.04 hours) by the number of half-lives (2). This gives us a half-life of 1.52 hours for silver-112.

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Answer:

Lithium Fluoride.

Explanation:I know science.

Answer:

I think the density of the object determines if it floats or sinks

There are 7.52 x 10^22 molecules of carbon dioxide gas, CO2, in 0.125 moles.

        The number of molecules in a given number of moles can be calculated using Avogadro’s number, which is approximately 6.022 x 10^23. This number represents the number of particles (atoms or molecules) in one mole of a substance.

         To calculate the number of molecules in 0.125 moles of CO2, we can multiply the number of moles by Avogadro’s number: 0.125 moles x (6.022 x 10^23 molecules/mole) = 7.52 x 10^22 molecules.

         Avogadro’s number is a fundamental constant in chemistry and is used in many calculations involving moles and molar mass.  

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Answer:

Metabolism

Explanation:

This is called Metabolism.

Metabolism is a combination of spontaneous chemical reactions which release non-spontaneous energy and chemical reactions requiring energy to proceed. In order to perform cellular processes, living organisms can take energy from food, nutrients or sunlight.

Answer:

Combination or Synthesis

Explanation:

It is a combination because 2 reactants are combining together to form the product.

Answer:-3m/s east

Explanation:that’s right

The dosage of 26mg can be prepared using approximately 1.625 mL of the 40mg in 2.5 mL solution.

The dosage of 22mg can be prepared using approximately 1.222 mL of the 36mg per 2 mL strength solution.

To calculate the dosage using ratio and proportion, we can set up a proportion based on the strength of the solution.

40mg in 2.5 mL solution will be used to prepare a 26mg dosage.

Let X represent the mL of the solution needed to prepare the 26mg dosage.

We can set up the proportion as follows:

40mg/2.5mL = 26mg/X mL

Cross-multiplying and solving for X, we have:

40mg * X mL = 2.5mL * 26mg

40X = 65

X = 65/40

X ≈ 1.625 mL

For the second question:

36mg per 2 mL strength solution is used to prepare 22mg.

Let Y represent the mL of the solution needed to prepare the 22mg dosage.

We can set up the proportion as follows:

36mg/2mL = 22mg/Y mL

Cross-multiplying and solving for Y, we have:

36mg * Y mL = 2mL * 22mg

36Y = 44

Y = 44/36

Y ≈ 1.222 mL

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Answer:

WHY DO YOU NEED HELP HUH

DON'T CHEAT READ AND STUDY

Explanation:

Answer:

It's C

Explanation:

Answer:

chemical energy

Explanation:

i am groot i am groot

Answer:

100

Explanation:

Will autoionzation of water be spontaneous at high temperature

An investigation into an unknown object in space resulted in the following observations: It was discovered to be an asteroid, It revolves around the sun, which is in the third position.

It is a small, rocky substance that rotates around the sun and is found in the asteroid belt, which is located between the orbits of Mars and Jupiter, and its size varies, with some still in fragments and others having a large structure.

Hence, an investigation into an unknown object in space resulted in the following observations: It was discovered to be an asteroid, It revolves around the sun, which is in the third position.

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Answer:

LiHCO3 its PH >7

Explanation:

the real ph for it is 11.3 so it makes it more than 7

and if you know it is a conjugate base coming from the weak acid H2CO3 so LiHCO3 is a base

The movement of the continental plates is due to convection currents located at the Earth's mantle below the crust.

In conclusion, the movement of the continental plates is due to convection currents located at the Earth's mantle below the crust.

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Answer:

B. X represents phosphorus

Explanation:

In an isotope symbol, you write the mass number above the atomic number. So the 31 represents the mass of the protons and neutrons of the element added together, and the 15 represents the atomic number or the total number of protons in the nucleus.

Since potassium bromide is replaced by element X to generate KX and Br2, we can infer from the reaction that element X is more reactive than bromine.

As a result, potassium bromide is represented by the formula KBr, but when the potassium and bromide ions are written separately, they are K+ and Br.

As a result, when chlorofluorocarbon gas is passed through a potassium bromide aqueous solution, bromine gas is released, which causes the solution to turn brown.

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Answer:

Discharge

Explanation:

this is the answer

The partial pressure of xenon is 3.29 atm.

The number of moles of xenon is 5.45 mol.

The partial pressure of neon is 1.41 atm.

The number of moles of neon is 9.24 mol.

Using Dalton's law of partial pressures, the total pressure is the sum of the partial pressures of each gas. Let P_Xe and P_Ne be the partial pressures of xenon and neon, respectively. Then we have:

The mole fraction of xenon is given as 0.701, which means that the mole fraction of neon is 0.299. Therefore, we can write:

We can solve for the number of moles of each gas:

We can substitute these expressions into the equation for partial pressures:

Plugging in the given values, we get:

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Answer:

18.01528 g/mol

Explanation:

Using the equation to figure this out

Answer:

18.01528 g/mol

One example of a chemical change that we encounter every day is the process of combustion.

Combustion is a chemical reaction in which a substance reacts with oxygen to produce heat, light, and new chemical compounds. A common example is the burning of wood or paper.

When we light a match or ignite a piece of paper, the chemical bonds in the material break, and the carbon and hydrogen atoms in the substance combine with oxygen from the air to form carbon dioxide and water vapor.

This release of energy in the form of heat and light is a result of the chemical change that occurs during combustion, and it is something we encounter regularly in activities such as lighting a candle or cooking food on a gas stove.

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Answer: \(836.8\ J\)

Explanation:

Given

Mass of water in the sample is \(m=100\ g\)

Temperature changes from \(25^{\circ}C\) to \(27^{\circ}C\)

Change in temperature is \(\Delta T=27-25=2^{\circ}C\ \text{or}\ 2\ K\)

We know, specific heat of water is \(c=4.184\ J/g-K\)

Heat absorbed is given by

\(\Rightarrow Q=mc\Delta T\\\Rightarrow Q=100\times 4.184\times 2\\\Rightarrow Q=836.8\ J\)

Thus, water absorbs \(836.8\ J\) of heat from hot plate.

If you were to observe light generated by heating pure elements through a prism or spectroscope, you would notice a unique spectral pattern. The spectral pattern would appear as a series of colored lines separated by dark spaces, and this is known as the atomic spectrum of the element.

Each pure element has its own distinct atomic spectrum, which arises due to the arrangement of electrons in the element's atoms. The electrons in the atoms occupy energy levels, and when they transition between these levels, they emit or absorb light at specific wavelengths. These wavelengths correspond to the different colors observed in the atomic spectrum. Therefore, the use of a prism or spectroscope can reveal valuable information about the composition of the element, as well as its electronic structure. Overall, studying the spectral patterns of different pure elements can provide insight into the fundamental building blocks of matter and the interactions of atoms with light.

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Three ways in which colorless compounds can be located on a TLC (Thin Layer Chromatography) slide are:

1) Iodine Staining: The TLC slide is placed in a container with iodine crystals. The iodine vapor reacts with the colorless compounds and produces a yellowish-brown stain, which helps to locate the compounds.

2) UV Light: The TLC slide is exposed to UV light. Some colorless compounds absorb the UV light and appear as dark spots on the slide.

3) Chemical Staining: The TLC slide is treated with a chemical reagent that reacts with the colorless compounds and produces a colored stain. For example, ninhydrin is used to locate amino acids and proteins on a TLC slide.

In conclusion, colorless compounds can be located on a TLC slide by using iodine staining, UV light, and chemical staining. These methods help to visualize and identify the compounds on the slide.

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In double displacement type of reaction the positive ions switch between two compounds and form two brand new compounds.

A double displacement is defined as a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds.

The double-displacement reaction generally represented in the form of AB + CD → AD + CB where A and C are positively-charged cations, while B and D are negatively-charged anions.

Some of the examples of double displacement reaction are given as,

NaOH + NH₄Cl ⇄ NaCl + NH₄OH

AgNO₃ + NaCl ⇄ AgCl + NaNO₃

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Answer:

the advantages of modern periodic tables are given below and explained.

hope this helped you☺️

any confusion then comment it and let me know.

actually as I say these points say that the modern periodic table is better than mendeleev periodic table so, don't get confused.

The use of phenol (carbolic acid) as a surgical wound disinfectant was first practiced by Joseph Lister.

Joseph Lister was a surgeon, scientist, pathologist, etc. He was famous for the discovery of the prevention of infection in wounds. He first used phenol as a disinfectant agent for wounds.

Phenol is an inorganic compound, it is white crystalline and solid. It was used by Joseph Lister as an agent for a disinfectant agent. He discovered the safer medical procedure.

Thus, Joseph Lister was the first to utilize phenol (carbolic acid) to sterilize surgical wounds.

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Answer:

When carbon dioxide dissolves in seawater, the water becomes more acidic and the ocean's pH (a measure of how acidic or basic the ocean is) drops.

Explanation:

hope this helps