“all elements are produced by all stars” why is this statement not completely true

The number of moles for the quanity 8.06 x\(10_{21\) atoms of Pt​ is approximately 2.61 grams.

To calculate the number of moles for a given quantity of atoms, we can use Avogadro's number and the molar mass of the element. Avogadro's number is 6.022 x 10²³ atoms/mol.

In this case, you have 8.06 x 10²¹ atoms of Pt. To find the number of moles, divide this quantity by Avogadro's number:

8.06 x 10²¹  atoms Pt / 6.022 x 10²³  atoms/mol = 0.0134 mol Pt

So, there are approximately 0.0134 moles of Pt in 8.06 x 10²¹  atoms of Pt.

The molar mass of Pt (platinum) is 195.08 g/mol. To convert the number of moles to grams, multiply the number of moles by the molar mass:

0.0134 mol Pt x 195.08 g/mol = 2.61 g Pt

Therefore, there are approximately 2.61 grams of Pt in 8.06 x10²¹  atoms of Pt.

In summary, the number of moles for the quantity 8.06 x 10²¹ atoms of Pt is approximately 0.0134 moles. This is equivalent to approximately 2.61 grams of Pt. Remember to use Avogadro's number and the molar mass to perform these calculations accurately.

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Answer:

Erosion is the transportation of sediment at the Earth's surface. 4 agents move sediment: Water, Wind, Glaciers, and Mass Wasting (gravity).

Explanation:

Answer:

Erosion is a process where materials are worn away and transported by natural forces such as wind or water

Explanation:

Answer:

the powerhouse of the cell

Answer:

100cg

Explanation:

1mg is equal to 0.1 cg

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Answer:

The reaction between carbon (C) and water (H2O) forms carbon monoxide (CO) and hydrogen gas (H2). The balanced chemical equation for this reaction is:

C(s) + H2O(g) -> CO(g) + H2(g)

According to this balanced equation, one mole of carbon reacts with one mole of water to produce one mole of carbon monoxide and one mole of hydrogen gas.

First, calculate the number of moles of carbon in 34 grams. The molar mass of carbon is approximately 12.01 grams/mole.

Moles of carbon = 34 grams / 12.01 grams/mole = 2.831 moles

As the stoichiometry of the reaction shows a 1:1 ratio between carbon and hydrogen, the moles of hydrogen produced would also be 2.831 moles.

The molar mass of hydrogen (H2) is approximately 2 grams/mole.

So, the mass of hydrogen produced = 2.831 moles * 2 grams/mole = 5.662 grams

Therefore, if 34 grams of carbon reacts with an unlimited amount of water, approximately 5.66 grams of hydrogen gas would be formed.

Explanation:

Approximations followed for answer.

There are approximately 3.47 x 10²² molecules in 5.657g H₂SO₄.

To calculate the number of molecules in 5.657g H₂SO₄, we need to use the Avogadro's number and the molar mass of H₂SO₄.

The molar mass of H₂SO₄ is 98.079 g/mol.

We need to calculate the number of moles of H₂SO₄:

Number of moles = mass/molar mass

                             = 5.657g / 98.079 g/mol

                            = 0.05767 mol.

Then, we can use Avogadro's number, which is 6.022 x 10²³ molecules/mol, to find the number of molecules:

Number of molecules = number of moles x Avogadro's number

                                   = 0.05767 mol x 6.022 x 10²³ molecules/mol

                                    = 3.47 x 10²² molecules

To calculate the number of molecules in a given sample of a substance, you need to use the Avogadro's number, which is 6.022 x 10²³ molecules/mol. This means that one mole of a substance contains 6.022 x 10²³ molecules.

We are given the mass of H₂SO₄, which is 5.657 g. To calculate the number of molecules, we first need to determine the number of moles of H₂SO₄ in the given sample. The molar mass of H₂SO₄ is 98.08 g/mol. So, the number of moles of H₂SO₄ can be calculated as follows:

moles = mass / molar mass

moles = 5.657 g / 98.08 g/mol

moles = 0.0576 mol

Now, we can use the Avogadro's number to determine the number of molecules of H₂SO₄ in 0.0576 moles:

number of molecules = moles x Avogadro's number

number of molecules = 0.0576 mol x 6.022 x 10²³ molecules/mol

number of molecules = 3.47 x 10²² molecules

As a result, in 5.657 g of the material, there are roughly 3.47 x 1022 molecules of H₂SO₄.

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Answer:

0.4058L of 1.0M H3PO4

0.2192L of 1.5M NaOH

Explanation:

The pKa of the H3PO4 / H2PO4- buffer is 2.12

To solve this question we must use H-H equation for this system:

pH = pKa + log [H2PO4-] / [H3PO4]

2.75 = 2.12 +  log [H2PO4-] / [H3PO4]

0.63 = log [H2PO4-] / [H3PO4]

4.2658 = [H2PO4-] / [H3PO4] (1)

Where [] could be taken as the moles of each reactant

As you have H3PO4 solution, the reaction with NaOH is:

H3PO4 + NaOH → H2PO4- + Na+ + H2O

As you can see, both H3PO4 and H2PO4- comes from the same 1.0M H3PO4 solution

The moles of H3PO4 are:

[H3PO4] = Moles H3PO4 - Moles NaOH

And for H2PO4-:

[H2PO4-] = Moles NaOH added

Replacing in (1):

4.2658 = [Moles NaOH] / [Moles H3PO4 - Moles NaOH]

4.2658 Moles H3PO4 - 4.2658 moles NaOH = Moles NaOH

4.2658 Moles H3PO4 = 5.2658 moles NaOH (1)

In volume:

0.625L = Moles H3PO4 / 1.0M + Moles NaOH / 1.5M

0.625 = Mol H3PO4 + 0.6667 Moles NaOH (2)

Replacing (2) in (1):

4.2658 Moles H3PO4 = 5.2658 (0.625 - Mol H3PO4 / 0.6667)

4.2658 Moles H3PO4 = 5.2658 (0.625 - Mol H3PO4) / 0.6667

4.2658 Moles H3PO4 = 5.2658*(0.9375 - 1.5 mol H3PO4)

4.2658 Moles H3PO4 = 4.9367 -7.8983 mol H3PO4

12.1641 mol H3PO4 = 4.9367

Mol H3PO4 = 0.4058moles * (1L / 1.0moles) =

0.4058L of 1.0M H3PO4

And:

0.625L - 0.4058L =

0.2192L of 1.5M NaOH

Answer: B. all the resources used to produce any goods and services

Explanation:

      The factors of production are all the resources used to produce any goods and services. This means our answer is option B.

      This includes, but is not limited to, land, labor, capital, and entrepreneurship.

Atoms are the smallest indivisible part of an element while molecules are combinations of two or more atoms. See details below.

Atoms are the smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.

Molecules, on the other hand, are the smallest particle of a specific element or compound that retains the chemical properties of that element or compound. They are two or more atoms held together by chemical bonds.

An element is the simplest chemical substance that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.

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The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Answer:

1 2 2

Explanation:

Considering the definition of compound, chemical formula and Avogadro's Number, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.

In a compound there are atoms of different elements joined by forces that we call chemical bonds.

The chemical formula indicates the number and type of different atoms present in the molecule.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

In this case, in 1 mole of the compound H₃PO₄ you have:

Then, in 2 moles of H₃PO₄ you have 8 moles of O.

Now, you can apply the following rule of three: if by definition of Avogadro's number 1 mole of oxygen contains 6.023×10²³ atoms, 8 moles of oxygen contains how many oxygen atoms?

\(number of atoms=\frac{8 molesx6.023x10^{23}atoms }{1 mole}\)

number of atoms= 4.8184×10²⁴ atoms

Finally, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.

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Answer: physical

Explanation: water doesn't undergo chemical change when it melts and freezes, because either way frozen or not the molecules are the same. hope i helped ;] BRAINLYEST?????

Answer:

Elements in the same period have the same number of electron shells moving across a period elements gain electrons and protons and become less metallic. This arrangement reflects the periodic recurrence of similar properties as the atomic number increases.

Explanation:

From the stoichiometry of the reaction, 0.094 g  of \(Cu^{2+}\) is contained in the reaction.

The reaction equation is given by; \(2Na_{3}PO_{4} (aq) + 3CuCl_{2} (aq) ----- > 6NaCl (aq) + Cu_{3}(PO_{4}) _{2} (s)\). We must note that the balanced reaction equation is the entry way into obtaining the correct stoichiometry of the reaction in order to solve the problem.

Number of moles of \(Na_{3}PO_{4}\) =  5.00 × 10−2 L *  0.173 mol L−1 = 0.00865 moles

If 2 moles of \(Na_{3}PO_{4}\) produces 1 mole of\(Cu_{3}(PO_{4}) _{2}\)

0.00865 moles of \(Na_{3}PO_{4}\) produces  0.00865 moles * 1 mole/2 moles

= 0.0043 moles of \(Cu3(PO4)2\)

Number of moles of \(Cu^{2+}\) = 0.0043 moles/3 = 0.00144 moles

Mass of \(Cu^{2+}\) = 0.00144 moles * 63.5 g/mol = 0.094 g

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Moles of Sr²⁺ = 0.3375

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

\(\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}\)

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

\(\boxed{\bold{n=V\times M}}\)

Strontium phosphide (Sr₃P₂)

Sr₃P₂ ⇒ 3Sr ²⁺ + 2P³⁻

\(\tt 0.45~M \times 0.25~L=0.1125\)

mol ratio Sr₃P₂ : Sr ²⁺ = 1 : 3

\(\tt \dfrac{3}{1}\times 0.1125=0.3375\)

Answer:

Q = 440 J

Explanation:

Given data:

Heat required = ?

Initial temperature = 25°C

Final temperature = 40°C

Mass in gram  = 20 g

Specific heat capacity = 1.1 J/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 40°C - 20°C

ΔT = 20°C

Q = 20 g×1.1 J/g.°C × 20°C

Q = 440 J

J.J. Thomson discovered electrons and their negative charge through the cathode ray experiment, leading to the development of the plum pudding model of the atom.

J.J. Thomson, a British physicist, was the first to discover electrons in 1897.

He conducted the cathode ray experiment to identify the negatively charged particles.

The cathode ray tube is a vacuum-sealed glass tube with two electrodes at each end: a cathode and an anode.

When a high voltage electrical current is applied to the electrodes, the tube glows, indicating that the cathode rays are being emitted from the cathode and traveling through the tube towards the anode.

The cathode rays were found to have a negative charge, according to Thomson.

These rays were identified as particles by the presence of a magnet, which caused the particles to bend in the direction opposite to the magnet's polarity.

This discovery indicated that the particles had a charge on them because they were deflected by the magnetic field, which is only possible if the particles have an electric charge.

Thomson further concluded that these particles were about 1,000 times smaller than hydrogen atoms because of the degree of deflection they experienced in the magnetic field.

Furthermore, Thomson created the plum pudding model of an atom, in which electrons are dispersed throughout a positively charged matrix, based on his findings.

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The volume of the platinum solid is determined as 8.16 cm³.

The volume of the  platinum solid is calculated from its density and mass as shown below.

V = m/ρ

where;

Volume of the platinum solid is calculated as follows;

V = 175 g / 21.45 g/cm³

V = 8.16 cm³

Thus, the volume of the platinum solid is determined as 8.16 cm³.

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There are 2.64 × 1022 molecules of sucrose present in this serving of fruit dessert containing 15.0 g of sugar.

To determine the number of molecules of sugar present in the serving, we need to calculate the number of moles of sugar and then convert it to the number of molecules.

Given:

Mass of sugar (sucrose) = 15.0 g

Molar mass of sucrose (C12H22O11) = 342 g/mol

First, calculate the number of moles of sugar using the formula:

Number of moles = Mass of substance / Molar mass

Number of moles of sugar = 15.0 g / 342 g/mol ≈ 0.0439 mol

Next, we use Avogadro's number, which states that there are approximately 6.022 × 10^23 molecules in one mole of a substance. Therefore, to find the number of molecules of sugar:

Number of molecules = Number of moles × Avogadro's number

Number of molecules of sugar = 0.0439 mol × 6.022 × 10^23 molecules/mol ≈ 2.64 × 10^22 molecules

Therefore, there are approximately 2.64 × 10^22 molecules of sugar present in this serving.

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Answer:

FREE RADICAL SUBSTITUTION REACTIONS

Explanation:

Alkanes undergo substitution reactions with halogens in the presence of ultra-violent light. In substitution reaction, an atom is exchanged with another atom. For exmaple, methane, an alkane reacts with bromine or chlorine( halogens) to form methylbromine or methylchlorine and hydrogen bromide or hydrogen chloride.

This type of substitution reaction is a free radical substitution reaction. In free radical substitution reaction, free radicals are the reactive intermediates and involves two or more steps as the case may be.

The initiation step where the free radicals are produced by homolysis  either by heat or ultra-violent ray of light. The free radicals produced are exchanged at the termination step as the produced free radicals recombines with another radical species of the reacting substances.

Methane + Bromine --------> Methylbromine + Hydrogen Bromide

CH4 + Br2 → CH3Br + HBr

You can see there is an exchange of a bromine atom with one hydrogen of methane that is one hydrogen atom in methane  is replaced by a bromine atom.

The complete reaction, according to the law of conservation of mass is:

XX + YY → 2XY

The Law of Conservation is a fundamental principle in chemistry and physics. It states that in a closed system, mass cannot be created or destroyed during a chemical reaction or a physical change. The total mass of the substances involved before the reaction or change must equal the total mass of the substances after the reaction or change.

This principle is based on the understanding that atoms are not created or destroyed, but they can combine or separate to form different substances.

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The answer responses to  the structures shown in the diagram are:

A. chromosomes

C. They would be the same.

B. They are in pairs because each one comes from a different parent.

The chromosomes are in pairs because humans have a diploid number of chromosomes, meaning they have two sets of chromosomes, one inherited from each parent.

The nucleus is important in eukaryotic cells and has many important parts that help the cell work properly. There are some parts inside cells called the nuclear membrane, nucleoplasm, nucleolus, and chromatin. Chromatin is made up of DNA and other proteins.

Every part of a person's body has the same genes, but the way they are organized can be different in different types of cells. The chromosomes in our skin cells might not be the same as the chromosomes in our muscle cells, even if they come from the same person.

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Identify the structures shown.

A. chromosomes

B. mitochondria

C. nuclei

D. vacuoles

C

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.

A. There would be longer.

B. They would be shorter.

C. They would be the same.

D. They would be different.

Explain why the structures are in pairs.

A. They aren't in pairs.

B. They are in pairs because each one comes from a different parent.

C. This cell is making a copy of itself.

D. The cell always has 2 copies in case 1 is damaged.

As per the given balanced reaction, 2 moles of silver gives 1 mole of the product silver sulfide. Hence, 0.04 moles will given 0.02 moles of silver sulfide.

The theoretical yield of a reaction is the amount of product obtained based on the balanced chemical equation of the reaction. However, the actual yield might vary from the the theoretical value.

The given reaction of Ag and H₂S shows that, two  moles of Ag produce one mole of the product silver sulfide.

Number of moles of silver sulfide produce by 0.04 moles of Ag is  then half of this number that is 0.02 moles of Ag₂S.

Therefore, 0.0 moles of Ag will give 0.02 moles of silver sulfide.  Using the same way, we can determine the yield of products in any reaction.

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Answer:

7.41 × 10⁻⁵

Explanation:

Let's consider the basic dissociation reaction of trimethylamine (CH₃)N).

(CH₃)N + H₂O = (CH₃)NH⁺ + OH⁻

According to Brönsted-Lowry, in this reaction (CH₃)N is a base and (CH₃)NH⁺ is its conjugate acid. The pKb for (CH₃)N is 9.87. We can calculate the pKa of (CH₃)NH⁺ using the following expression.

pKa + pKb = 14

pKa = 14 - pKb = 14 - 9.87 = 4.13

Then, we can calculate the acid dissociation constant for (CH₃)NH⁺ using the following expression.

pKa = -log Ka

Ka = antilog - pKa = antilog -4.13 = 7.41 × 10⁻⁵