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The nuclear disintegration series of 238-U is the source of radon-222 in soil.

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Answer:

First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges .  it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.

Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.

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Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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The Bohr radius is a fundamental constant in atomic physics that represents the average distance between the nucleus and the electron in a hydrogen atom. The value of the Bohr radius is approximately 0.529 Å (angstroms) or 52.9 pm (picometers).

The Bohr radius (a₀) is a physical constant derived from the Bohr model of the hydrogen atom. It represents the average distance between the nucleus (a single proton) and the orbiting electron in a hydrogen atom. The Bohr model assumes that the electron moves in circular orbits around the nucleus, and the radius of the orbit depends on the energy level of the electron.

The value of the Bohr radius is approximately 0.529 Å (angstroms) or 52.9 pm (picometers). This value is commonly used as a unit to measure atomic sizes and distances. The picometer (pm) is a convenient unit for expressing atomic scales, as it is equivalent to 10^(-12) meters.

The Bohr radius provides a scale for understanding the size of atoms and their electronic structure. It is particularly relevant in hydrogen-like systems, where the electronic structure is similar to that of a hydrogen atom with a single electron orbiting a central nucleus.

The Bohr radius allows scientists to estimate the average size of atomic orbitals and the distances between atoms in molecules.

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Answer:

128.98 g/Mol

Explanation:

ΔTb = Kb * m * i

Where;

ΔTb = boiling point elevation

Kb = boiling point constant

m = molality of the solution

i = Van't Hoff factor

Hence;

Where molality = number of moles of solute/mass of solvent in Kg

Number of moles of solute = mass/Molar mass

So;

80.61 - 80.10 = 2.53 * 13g/M/0.5 * 1

Where M is the molar mass of the solute

0.51 = 2.53 * 13g/M/0.5

0.51 = 2.53 * 13/M * 1/0.5

0.51 = 32.89/M * 1/0.5

0.51 * 0.5 = 32.89/M

0.255 M = 32.89

M = 32.89/0.255

M= 128.98 g/Mol

The process by which the atoms of one or more substances are rearranged to form different substances is called a chemical reaction.

The manner of reorganizing atoms via way of means of breaking one set of chemical bonds and forming a brand new set is called a chemical reaction. A chemical change is a change in count wherein the materials that make up that count change into materials with specific chemical and bodily properties. In a chemical change, additionally known as a chemical reaction, atoms rearrange to shape new materials, which ends up in specific bodily properties, as well.

Thus, the process is known as chemical reaction.

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Carlotta can respond by explaining the difference between a physical mixture and a chemical compound. The main difference between a physical mixture and a chemical compound lies in their composition and properties.

A physical mixture, also known as a mixture, is a combination of two or more substances that are physically combined but retain their individual chemical properties. In a physical mixture, the substances can be present in varying proportions, and they can be separated by physical means, such as filtration or evaporation.

Each component of the mixture retains its original properties, and no new substances are formed. Examples of physical mixtures include saltwater, air, and a bag of mixed nuts.

On the other hand, a chemical compound is a substance composed of two or more different elements that are chemically combined in a fixed ratio. Chemical compounds are formed through chemical reactions, during which the atoms rearrange and form new chemical bonds.

The resulting compound has unique properties distinct from its individual elements. Chemical compounds have a definite composition and cannot be separated into their constituent elements by physical means alone. Examples of chemical compounds include water (H₂O), sodium chloride (NaCl), and carbon dioxide (CO₂).

In summary, A physical mixture is a combination of substances that can be separated by physical means and retains the individual properties of its components. A chemical compound is formed through a chemical reaction, has a fixed composition, and exhibits unique properties different from its constituent elements.

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Answer:

Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule. A mixture is composed of different types of atoms or molecules that are not chemically bonded.

Answer:

It would depend on the mixture to determine what the mixture is.

Explanation:

If you don't know what the mixture is then you wont be able to find what substances, since their could be many components.

That 1500 kJ of energy were transferred to water at 20.0°C. Heat capacity (c) for liquid water is 4.18 J/g C​. mass of water could be brought to the boiling point is 4485 g.

given that :

heat energy = 1500 kJ

heat capacity , c = 4.18 J/g °C

initial temperature = 20.0°C

boiling of water ,final temperature = 100 °C

Q = mcΔT

m = Q / (cΔT)

m = 1500 / ( 4.18 × ( 100 °C - 20 °C )

m = 1500 / 334.4

m = 4.485 kg = 4485 g

Thus, That 1500 kJ of energy were transferred to water at 20.0°C. Heat capacity (c) for liquid water is 4.18 J/g C. ​mass of water could be brought to the boiling point is 4485 g.

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Answer: B) It presents the correct sequence of events in Earth’s history.

Explanation: edge 2021

The correct calculation for pH is pH = 4.76 + log(0.0950/0.0750) = 4.86.

To calculate the pH of the solution, we need to determine the concentration of the acid and its conjugate base after the reaction between CH3COOH and NaOH. The reaction between the acid and base results in the formation of the conjugate base CH3COO-.

In this case, we have 500 mL of 0.150 M CH3COOH and 0.0200 mol of NaOH. Since NaOH is a strong base, it completely reacts with the weak acid to form the conjugate base. The moles of CH3COOH reacted with NaOH can be calculated by multiplying the volume of CH3COOH by its concentration.

Next, we need to determine the concentration of CH3COOH and CH3COO- in the final solution. The initial concentration of CH3COOH can be subtracted by the moles reacted with NaOH, while the concentration of CH3COO- will be equal to the moles reacted with NaOH divided by the total volume of the solution.

Using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the weak acid, we can plug in the values and solve for pH.

Out of the given options, the correct calculation for pH is pH = 4.76 + log(0.0950/0.0750) = 4.86.

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Answer:

Explanation:

The mass of the sailboat can be found by using the formula

\(m = \frac{f}{a} \\ \)

f is the force

a is the acceleration

From the question we have

\(m = \frac{4000}{2} \\ \)

We have the final answer as

Hope this helps you

Answer:

The molecular weight of sodium sulfate is 142.1 g/mol. To calculate the mass of sodium sulfate, substitute the values in the formula. Therefore, the mass of sodium sulfate formed when we start with 200.0 grams of sodium hydroxide and you have excess sulphuric acid is 355.25g.

Answer:

Q = 5949.35 J

Explanation:

Given that,

The mass of water, m = 189.5 grams

Initial temperature, T = 16.4 °C

Final temperature, T' = 8.9°C

We need to find the thermal energy the water use to melt the ice cube. The thermal energy is given by :

\(Q=mc\Delta T\)

Where

c is the specific heat of the water, c = 4.186 joule/gram °C

So,

\(Q=189.5\times 4.186 \times (8.9-16.4)\\Q=-5949.35\ J\)

So, the required amount heat is equal to 5949.35 J.

Answer:

2H3PO4+ 3Ca(OH)2=Ca3(PO4)2+6H20

Answer:

a) 2KOH -> K2O + H20

Explanation:

The second one I dont know. but for the 1st part I'm sure 100%

\( \huge\mathrm{ \boxed{A} \boxed{n}\boxed{s}\boxed{w}\boxed{e}\boxed{r}}\)

The Correct option is C.)

Above diagram shows how Sodium and Chlorine forms an Ionic bond.

\( \mathrm{2Na + Cl_2 \rightarrow2NaCl }\)

_____________________________

\(\mathrm{ \#TeeNForeveR}\)

The sample containing the least number of atoms is 1 mol of H2O.

In this sample, there are three atoms: two hydrogen atoms and one oxygen atom.

Atoms are the fundamental units that make up everything we see, feel, and experience around us.

Everything, including the air we breathe, the food we eat, and the clothes we wear, is made up of atoms.

They are so tiny that they cannot be seen even with the most powerful microscope.SampleA sample is a subset of a population that is chosen for investigation.

A sample is a representation of the whole population and is chosen to ensure that the results of the study can be generalized to the entire population.

The number of atoms in a sample varies depending on the substance.

The Avogadro's number of atoms is contained in 1 mole of any substance.

The mole is a unit of measurement used in chemistry to measure the quantity of a substance.

In conclusion, the sample containing the least number of atoms is 1 mol of H2O.

In this sample, there are three atoms: two hydrogen atoms and one oxygen atom.

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Answer:

A

Explanation:

For example salt would stay as a crystal

One of the isomers of C4H10O that is an alcohol is the 1-butanol or butyl alcohol:

Another of the alcohols that has the given formula is tert-butanol or tert-butyl alcohol:

The third isomer of C4H10O is 2-butanol:

And the last isomer is isobutanol or isobutyl alcohol:

The camel consumed approximately 2.24 kg of protein from the Bermudagrass hay.

To calculate the amount of protein the camel consumed, we need to consider the dry matter basis of the hay. Here's how you can calculate it:

Calculate the dry matter weight of the hay:

Dry Matter Weight = Total Weight of Hay × Dry Matter Percentage

Dry Matter Weight = 18.3 kg × (83.4/100)

Dry Matter Weight = 18.3 kg × 0.834

Dry Matter Weight = 15.2442 kg

Calculate the protein content in the dry matter;

Protein Content = Dry Matter Weight × Protein Percentage

Protein Content = 15.2442 kg × (14.7/100)

Protein Content = 15.2442 kg × 0.147

Protein Content = 2.2414194 kg

Therefore, the camel consumed approximately 2.24 kg of protein from the Bermudagrass hay.

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Answer:

It should be 115.5 amu but you didnt type that as an answer choice so...

Explanation:

Bruh all you had to do was add oxygen and sulfur and subtract from the total to get your answer :D.

To determine the most likely untrue statement, more information about the nature and properties of the samples is required.

Based on the information provided, it is difficult to determine which statement is probably not true without additional context or details about the samples. However, I can explain what each statement means:
a) NOT Sample #2 was darker: This statement suggests that Sample #2 was not darker than Sample #1.
b) NOT Sample #2 had more intense flavors: This statement implies that Sample #2 did not have more intense flavors compared to Sample #1.
c) NOT Sample #1 was less expensive: This statement indicates that Sample #1 was not less expensive than Sample #2.
To determine the most likely untrue statement, more information about the nature and properties of the samples is required.

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To solve this we must be knowing each and every concept related to molecule. Therefore, eight molecules of Sulphur is written as S\(_8\).

A molecule is an electrically neutral collection of two or more atoms linked together by chemical bonds. Here are several instances of molecules, as well as an explanation of the differences between particles, compounds, and ions.

An atom is indeed the element's smallest unit. A single element's atoms all have the same amount of protons. Atoms cannot be separated further using any chemical process. A molecule, on the other hand, is the basic unit of such a pure material.  Eight molecules of Sulphur is written as S\(_8\). 8s is wrong representation.

Therefore, eight molecules of Sulphur is written as S\(_8\).

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Answer: The heat required to raise the temperature of 179 g of acetic acid, is 21000 Joules

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

\(Q=m\times c\times \Delta T\)

Q = Heat absorbed  = ?

m = mass of acetic acid = 179 g

c = heat capacity of acetic acid = \(2.043J/g^0C\)

Initial temperature  = \(T_i\) = \(25^0C\)

Final temperature = \(T_f\)  = \(82.7^0C\)

Change in temperature ,\(\Delta T=T_f-T_i=(82.7-25)^0C=57.7^0C\)

Putting in the values, we get:

\(Q=179g\times 2.043J/g^0C\times 57.7^0C=21100J\)

Thus heat required to raise the temperature of 179 g of acetic acid, is 21000 Joules

A 102g sample of a mixture of CaCO\(_3\) and NaCl is found to contain 23.5g of Calcium. 0.235 is the moles of calcium carbonate.

The term "mole concept" refers to the way that drug amounts are expressed. A mole is the volume of substance that has the same number of various elements (such as atoms, ions, and molecules) with the number of atoms for a sample of pure 12C that weighs exactly 12 g. There are many atoms in even a gramme of any pure element.

moles of calcium carbonate = 23.5/ 100= 0.235moles

mass of  sodium chloride =  102- 23.5=78.5

moles of sodium chloride =78.5/58.44= 1.35moles

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