g if a certain radioactive substance has a half-life of 7 days, how long, in days, does it take for the sample to decay to 1 3 of its original amount

Answer:

A trait is a quality of someone got like art and organisms get their traits from DNA.

The pH of a solution is determined by the acidity of the solution. The acidity of the solution is determined by the Ka of the acid in the solution, which in this case is HOOCH3.

In order to calculate the pH of a solution, we must first calculate the concentration of HOOCH3. To do this, we must first calculate the number of moles of CsOOCH3 in the solution. We can do this by taking the molar mass of CsOOCH3 (179.940 g/mol) and dividing it by the mass of CsOOCH3 in the solution (6.860 g). This gives us a number of 0.038 moles of CsOOCH3 in the solution.

Next, we must calculate the concentration of HOOCH3. Since the Ka of HOOCH3 is 1.75e-05, we can use the Ka formula to calculate the concentration. The Ka formula is Ka = [H+][A-]/[HA]. We know the Ka and the volume of the solution (152mL), so we can solve for [H+]. We solve for [H+] by plugging in the Ka and the volume of the solution and solving for [H+]. This gives us a [H+] of 3.81e-06.

Finally, we can calculate the pH of the solution by taking the negative log of [H+]. This gives us a pH of 5.42. With a roundoff tolerance of 0.03 and an absolute tolerance of 1e-08, we can round the pH to 5.43. Therefore, the pH of this solution is 5.43.

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Answer:

The formula is: p=mv

(P)momentum is equal to (m) mass times (v) velocity.

Explanation:

Answer:

There are 2 carbon atoms present.

The final pressure of the ideal gas is 23.47 atm.

We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation

P . V = n . R . T

where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.

From the question above, we know that

V1 = 120 L

P1 = 18 atm

T1 = 310 K

V2 = 95 L

T2 = 320 K

When the initial and final gas is the same, we can use the ratio of the ideal gas as

(P2 . V2) / (P1 . V1) = T2 / T1

(P2 . 95) / (18 . 120) = 320 / 310

P2 = 23.47 atm

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The condensed ground-state electron configuration of the transition metal ion \(Mn^{2+}\) is [Ar] \(3d^{5}\)

The electronic configuration of an element is the symbolic notation of the manner in which the electrons of its atoms are distributed in the periodic table over different atomic orbitals. While writing electron configurations, standardized rules are followed in which the energy level and the type of orbital are generally written first, followed by the number of electrons present in the orbital which is written in superscript.

In case of Manganese atomic number of the atom is 25. When we follow Aufbau principle the electronic configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{5}\) if we have to write it in a compact form we can write as [Ar]\(3d^{5}4s^{2}\). In case of \(Mn^{2+}\) we have to remove electron from the higher most orbital that is 4s so now the electronic configuration will be become [Ar]\(3d^{5}\).

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3 g/mL is the density in grams per millititer to three significant figures.

To express the density of a cube of butter in grams per milliliter, we need to convert the weight from pounds to grams and the volume from cubic inches to milliliters.

1 pound is approximately equal to 453.592 grams, so the weight of the cube of butter in grams would be:
0.260 lb * 453.592 g/lb = 117.81992 g (rounded to three significant figures as 118 g)

1 cubic inch is equal to approximately 16.387 milliliters, so the volume of the cube of butter in milliliters would be:
\(1303 cubic inches * 16.387 mL/in^3 = 21,365.861 mL\) (rounded to three significant figures as 21,400 mL)

Therefore, the density of the cube of butter would be:
Density = Mass / Volume

= 118 g / 21,400 mL

= 0.00551 g/mL (rounded to three significant figures as 0.005 g/mL)

For the gem, we already have the mass as 600 g and the volume as 200 mL.

Therefore, the density of the gem would be:
Density = Mass / Volume

= 600 g / 200 mL

= 3 g/mL (rounded to three significant figures)

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Answer: Option (b) is the correct answer.

Explanation:

It is known that,

                   pH + pOH = 14

So, pOH = 14 - pH

As the given pH is 9.3. Hence, pOH for the given solution will be calculated as follows.

          pOH = 14 - 9.3

                   = 4.7

Therefore, pOH of the given solution is 4.7.

The pH of the solution containing 4.25 × 10⁻³ mol of the weak base pyridine is approximately 9.23.

What is pH?

pH is a measure of the acidity or alkalinity of a solution. It quantifies the concentration of hydrogen ions (H+) present in a solution.

First, we need to calculate the concentration of pyridine in the solution:

Concentration of pyridine (C₅H₅N) = (Amount of pyridine) / (Volume of solution)

= (4.25 × 10⁻³ mol) / (0.025 L)

=0.17 M

Next, we'll set up an equilibrium expression using the Kb:

Kb = [C₅H₅NH⁺][OH⁻] / [C₅H₅N]

Let x be the change in concentration of the species:

1.7×10⁻⁹ = (x)(x) / (0.17 - x)

Since Kb is very small, we can assume x is much smaller than 0.17, so:

1.7×10⁻⁹ ≈ x² / 0.17

x² ≈ 2.89×10⁻¹⁰

x ≈ 1.7×10⁻⁵

x represents the concentration of OH⁻ ions:

[OH⁻] = 1.7×10⁻⁵ M

Once we have the concentration of hydroxide ions, we can calculate the pOH using the formula:

pOH = -log[OH-]

= -log(1.7×10⁻⁵) ≈ 4.77

Finally, we can find the pH using the equation:

pH = 14 - pOH

≈ 14 - 4.77 ≈ 9.23

Therefore, the pH of the solution containing pyridine is approximately 9.23.

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Answer:

λ = 6.25 × 10⁻¹⁰ m

x-ray

General Formulas and Concepts:

Speed of Light = Wavelength times Frequency

Explanation:

Step 1: Define

C = 3.0 × 10⁸ m/s

ν  = 4.80 × 10¹⁷ Hz (s⁻¹)

λ = unknown

Step 2: Solve for wavelength

3.0 × 10⁸ m/s = λ(4.80 × 10¹⁷ Hz)

λ = 6.25 × 10⁻¹⁰ m

Step 3: Check

We are given 3 sig figs. Follow sig fig rules.

6.25 has 3 sig figs. No changes necessary.

Step 4: Identify

6.25 × 10⁻¹⁰ m is in the x-ray spectrum according the the Electromagnetic Spectrum

The command that allows moving a file from one location to another is the "mv command".

The mv command renames or transfers files and folders from one directory to another. A file or directory keeps its base file name when moved to a new directory. All links to other files are preserved when you transfer a file, with the exception of when you move it to a different file system. A directory and its contents are added beneath the existing directory when you transfer a directory into it.

The TargetDirectory option of the mv command allows you to provide a new file name or a new directory path name when renaming a file or directory.

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Answer: b

Explanation:

Cu(NO3)2 has a mass of 4.69 g in 25.0 g of a 1.00 M solution of Cu(NO3)2(aq). A physical term used to describe the amount of matter in a thing is "mass."

The formula: moles of solute = concentration x volume of solution can be used to determine the mass of Cu(NO3)2 contained in 25.0 g of a 1.00 M solution of Cu(NO3)2(aq). Finding the volume of the solution containing one mole of Cu(NO3)2 is the first step.

Per litre of solution, 1.00 M equals 1 mole of Cu(NO3)2.

Cu(NO3)2 weights 187.6 g per mole.

Cu(NO3)2 mole 1 = 187.6 g

Cu(NO3)2:0.1 mole = 18.76 g

to prepare a Cu 1.00 M solution (NO3)

2. 18.76 g of Cu(NO3)2 must be dissolved in 1.00 L of solution.

the mass of Cu(NO3)2 present based on the molar mass of Cu(NO3)2:

Cu(NO3)2 mass equals 4.69 g or 0.0250 mol x 187.6 g/mol.

Hence, the quantity of Cu(NO3)2 in Cu(NO3)2(aq) in a 1.00 M solution has a mass of 4.69 g per 25.0 g.

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Answer:

Hello There!!

Explanation:

The answer is C.Wind.

hope this helps,have a great day!!

~Pinky~

Answer:

Hello! Your answer is D) All above

Explanation:

Hope I helped! Ask me anything if you have any questions. Brainiest plz!♥ Hope you make a 100%. Have a nice morning! -Amelia♥

Answer:

1 molecule of glucose contains 6 atoms of C, 12 atoms of H, and 6 atoms of O • 1 mole of glucose contains 6 moles of C atoms, 12 moles of H atoms, and 6 moles of O atoms.

Can I get Brainliest?

Explanation:

Answer:

The seasons are a result of the tilt of the earth

Answer:

The Surface Of The Earth

Explanation:

The Troposphere contains about half of all the air in the entire atmosphere. Because it is at the bottom, air pressure, or the weight of the air, is greatest in this layer. (The surface of the earth is in this layer, making it the answer.)

Answer:

here's the procedure to find it friend

Explanation:

How do you find the mass in grams of an atom?

In order to determine the mass of one atom of an element, you must determine its molar mass, which is its atomic weight on the periodic table in g/mol, and you need to know the relationship between moles and the number of atoms: 1 mol of atoms = 6.022×1023 atoms . Then divide the molar mass by 6.022×1023 atoms/mol .

Lithium=li

Iron=Fe

Helium=He

I don't say u must have to mark my ans as brainliest but if u think it has really helped u plz don't forget to thank me....

Answer:

lithium symbol=li helium= he and iron =i

Pest control companies in Australia commonly use a variety of chemicals to address pest infestations.

Pest control companies in Australia utilize a range of chemical substances to combat pest issues. The specific chemical used can depend on the type of pest being targeted and the nature of the infestation. Some commonly used chemicals include insecticides, rodenticides, and termiticides.

Insecticides are chemicals designed to eliminate or control insect populations. They can be formulated to target specific types of pests, such as ants, cockroaches, mosquitoes, or termites. These insecticides may work through contact, ingestion, or residual effects, effectively managing the targeted pest populations.

Rodenticides, as the name suggests, are chemicals used to control rodents like rats and mice. These substances are formulated to attract rodents and are often combined with toxic compounds that can lead to their eradication.

Termiticides, on the other hand, are chemicals developed to combat termite infestations. These substances are designed to either repel or kill termites and protect buildings from structural damage caused by these destructive pests.

It is important to note that the use of these chemicals by pest control companies is regulated by strict guidelines and regulations in Australia to ensure the safety of both humans and the environment. Qualified and licensed pest control professionals are responsible for the appropriate application of these chemicals.

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Yes, that's correct. The chemical formula "\(BaCl_2\)" represents the ratio of the elements in the compound barium chloride. In this case, it means there is one barium (Ba) atom and two chlorine (Cl) atoms in each representative unit of the compound.

What is the chemical formula?

The term chemical formula has to do with the way that the atoms that compose the substance are arranged. The arrangement of the atoms in the chemical substance would help us to have an idea of how the compound appears.

Now we are looking at the compound barium chloride of which we know that it is an ionic subsnace and since the substance is ionic in nature, we would talk about a formula unit of the compound as beings its representative unit in the crystal lattice of the substance.

The question above is incomplete, the complete question is:

The formula for barium chloride is BaCl2. The chemical formula for barium chloride shows the number of ___________ of each element in the ___________ representative unit of the substance.

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A star evolves off the main sequence when helium is exhausted in the stellar core.Our solar system’s gas giant planets (and those of other solar systems) did not become stars because they are not massive enough to generate the high temperatures and pressures necessary to start hydrogen fusion in the core.

Stars evolve off the main sequence when the nuclear fusion in their cores is no longer capable of supplying sufficient energy to maintain the gravitational energy, causing it to contract and the outer layers to expand and cool. When hydrogen runs out in the core of a star, the core shrinks and heats up and the outer layers expand, resulting in a red giant. However, when helium is consumed in the core, the core collapses and heats up, causing the outer envelope to get expelled, and the core evolves into a white dwarf.

A gas giant planet's temperature and pressure aren't high enough to generate fusion. They aren't dense enough to generate the heat required for nuclear fusion. Therefore, gas giant planets do not generate their own light and heat in the same way as stars. They can emit more energy than they obtain from the sun if they have a significant atmosphere. The planets in the solar system, such as Jupiter and Saturn, are examples of gas giants.

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If you feel that your placement in English, Math, Reading, ESL and/or Chemistry is incorrect, then you should follow the steps below to resolve the issue:

Step 1: Review the Placement Criteria: The first step is to review the placement criteria for the subject. It will help you to understand the reasons behind your placement.

Step 2: Contact the Admissions Office: After reviewing the placement criteria, if you still believe that your placement is not correct, then you should contact the Admissions Office of your college or university. The Admissions Office will provide you with guidance on how to proceed.

Step 3: Submit Additional Documentation: In case you feel that your placement is incorrect, you can submit additional documentation, including test scores or academic records, to the Admissions Office.

Step 4: Appeal the Placement: If you disagree with the placement decision, you can file an appeal. You must provide reasons for the appeal, and it must be filed within a specified timeframe.

Step 5: Take a Placement Test: Finally, if you feel that your placement is not accurate, then you can take a placement test. The test will assess your skills and knowledge and provide you with a placement that is more accurate.

In conclusion, if you believe that your English, Math, Reading, ESL and/or Chemistry placement is incorrect, then you should follow the steps mentioned above. It is essential to take the necessary steps to ensure that you are placed in the correct level. The correct placement will help you to succeed in your academic journey.

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the density of the oxygen gas sample is 1.123 g/L. The density of a gas can be calculated using the ideal gas law equation: Density = (Molar mass * Pressure) / (Gas constant * Temperature) In this case, we are given that the density of oxygen gas is g/L. We also know the pressure is 0.893 atm and the temperature is 41 °C.

To convert Celsius to Kelvin, we add 273.15 to the Celsius temperature. So, the temperature in Kelvin is 41 + 273.15 = 314.15 K. Now, let's solve the equation for density using the given values Density = (Molar mass * Pressure) / (Gas constant * Temperature) To use the ideal gas law equation, we need to convert the temperature to Kelvin.


Since the molar mass of oxygen is 32 g/mol and the gas constant is 0.0821 L·atm/(mol·K), we can substitute these values into the equation g/L = (32 g/mol * 0.893 atm) / (0.0821 L·atm/(mol·K) * 314.15 K) Now, we can calculate the density by simplifying the equation.

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Answer:

electrically charged particles

Explanation:

photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it.

Answer:

Its is a phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.

Explanation:

When light shines on a metal, electrons can be ejected from the surface of the metal in a phenomenon known as the photoelectric effect. This process is also often referred to as photoemission, and the electrons that are ejected from the metal are called photoelectrons.