It is economical to use scrap iron to get copper.
Give one reason why.

Answer:

A magnesium ion mg-2 has A 24 protons and 22 electrons

A sample currently contains 20 parent atoms and 60 daughter atoms. so the sample is approximately 4,706 years old.

To determine the age of the sample, we need to use the formula for radioactive decay:
N = N0(1/2)^(t/T)
where N is the current number of parent atoms, N0 is the initial number of parent atoms, t is the time elapsed, T is the half-life of the sample.
We are given that N0 = 20 and N/N0 = 60/20 = 3. Thus, we can solve for t:
3 = (1/2)^(t/2000)
Taking the natural log of both sides:
ln(3) = (t/2000) ln(1/2)
Solving for t:
t = 2000 ln(3)/ln(1/2)
t ≈ 4,706 years
Therefore, the sample is approximately 4,706 years old.

we can determine the age of the sample using the half-life of 2,000 years and the ratio of parent to daughter atoms.
The sample contains 20 parent atoms and 60 daughter atoms, making a total of 80 atoms. The ratio of parent to daughter atoms is 1:3. Since the half-life is 2,000 years, we can calculate the number of half-lives that have passed to reach this ratio.
Initially, there would have been 80 parent atoms and 0 daughter atoms. After the first half-life (2,000 years), there would be 40 parent atoms and 40 daughter atoms. After the second half-life (another 2,000 years), there would be 20 parent atoms and 60 daughter atoms, which matches the given information.
So, two half-lives have passed to reach the current state of the sample. Each half-life is 2,000 years long, so the age of the sample can be calculated as follows
Age of the sample = (Number of half-lives) * (Half-life)
Age of the sample = 2 * 2,000 years
Age of the sample = 4,000 years
Therefore, the sample is approximately 4,000 years old.

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There are various type of chemical reactions in chemistry like combination reaction , displacement reaction. One of these is the decomposition reaction. The correct option is option D.

Decomposition reaction is the one in which molecules breaks down in its constituent in presence of energy. Energy can be in any form, it can be light energy , heat energy.

Decomposition of water is done by providing electricity and the reaction is called electrolysis. Lysis means to break. To give decomposition reaction molecule must have more than one element.

The fourth reaction describe a decomposition reaction (NaNO3 decomposed to become NaNO2 and O2). First and third reaction are considered combustion reaction (reacting with oxygen). Second reaction is acid-base reaction.

Therefore, the correct option is option D.

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Breaking a chair into pieces  is an example of a substance changing its state of matter ,therefore option (c) is correct.

There are three state of matter which includes solid, liquid and gases.

A solid is, in most cases, rigid and holds a definite shape. Solids do not change shape at room temperature. They retain the same shape.

A liquid typically flows and, when inside a contained, takes its shape, although the upper surface remains flat or slightly curved.

Gases do not have any definite shape nor have any specific volume. Gases fill the entire space available to them. They can be compressed under pressure.

Breaking a chair into pieces  is an example of a substance changing its state of matter ,hence option (c) is correct.

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Answer:

Its (D) Water collecting on a cold glass

Explanation:

Got it right on my quiz.

Condensation, in this case the water vapor turns into a liquid causing a change of its state of mater.

Answer:

No, it's not possible to change the atoms into a different element.

Explanation:

No, because rule four of his theory says that change cannot occur

The chemist should add 2588 mL of water to prepare the 0.200 M aqueous solution with 30.2 g of NaCl.

To determine the volume of water needed to prepare the solution, we can use the formula:

mass of solute (g) / molar mass of solute (g/mol) = number of moles of solute

Then, we can use the formula for molarity to find the volume of water needed:

Molarity (M) = number of moles of solute / volume of solution (L)

Given that;

The mass of NaCl = 30.2 g.

Since its molar mass is 58.44 g/mol.

Hence;

30.2 g / 58.44 g/mol = 0.5176 mol of NaCl

Now, to prepare an aqueous solution with a concentration of 0.200 M, we need to determine the volume of solution needed. The formula for molarity can be rearranged to solve for volume:

Volume of solution (L) = number of moles of solute / Molarity (M)

Volume of solution = 0.5176 mol / 0.200 mol/L = 2.588 L

Therefore, we need 2.588 L of solution. Since the density of the solution is assumed to be the same as water, we know that 1 mL of water has a mass of 1 g, and the volume of water needed is:

2.588 L × 1000 mL/L = 2588 mL

Therefore, the total volume required by the chemist is 2588 mL.

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Answer:

20 Km/hr

Explanation:

You have to divide the Km and Hr

I hope it help you

Answer/Explanation:

Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change. Any characteristic that can be determined only by changing a substance's molecular structure.

Once both temperatures are identical, there is no overall transfer of heat since the quantity of heat transmitted form one component to the next is equal to the amount.

There are numerous people or things if you state there is any quantity of people or things. Any quantity of money is readily available to me at any time.You can count the volume of air in the bottle or the volume of fluid in a beaker. In a similar manner, you can determine how much cat hair is visible on an area rug or how much salt a patient has just consumed.

A base's positive ion cation and an anion make up a salt.

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The reaction given below can be represented as follows:`

H2PO4– + H2O ⇋ H3O+ + HPO42–

`Base–conjugate acid pair:` H2PO4–` and `HPO42–`

A Brønsted-Lowry acid-base reaction involves the transfer of a proton from one substance to another.

In this reaction, H2PO4– acts as an acid, donating a proton to water.

This produces the conjugate base of H2PO4–, HPO42–, and the conjugate acid of water, H3O+.

A base-conjugate acid pair is defined as two substances that differ only in the presence or absence of a single proton.

In this reaction, the base H2PO4– loses a proton to form its conjugate acid, HPO42–.

Therefore, `H2PO4–` and `HPO42–` is the base–conjugate acid pair.

The term "base-conjugate acid pair" refers to two species with the following characteristics:

They are both conjugates.

They differ by one hydrogen ion.

The dissociation of an acid (HA) results in the formation of a conjugate base (A−) and a hydrogen ion (H+). HA is called an acid, while A− is called a conjugate base.

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Answer:

19.9 moles

Explanation:

Each mole has 6.02 x 10^23 many atoms. This number is commonly known as "Avogadro's Number."

In this problem, we have 1.2 x 10^25 atoms of phosphorus.

Thus, (1.2 x 10^25)/(6.02 x 10^23) is the number of moles in 1.20 x 10^25 many atoms of phosphorus.

(1.2(10^25))/(6.02(10^23))

19.9 moles.

The moles are 19.9 moles

Each mole has \(6.02 \times 10^{23}\) many atoms.

This number is commonly known as "Avogadro's Number."

In this given question, we have \(1.2 \times 10^{25}\) atoms of phosphorus.

So \((1.2 \times 10^{25})\div (6.02 \times 10^{23})\)is the number of moles in\(1.20 \times 10^{25}\) many atoms of phosphorus.

Now  

\((1.2(10^{25}))\div (6.02(10^{23}))\)

19.9 moles.

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92.0 g of NO2 and 36.0 g of H2O can be combined to create 84.0 g of nitric acid (HNO3). With the chemical formula HNO3, nitric acid, sometimes referred to as aqua fortis or spirit of niter, is a potent mineral acid.

The suggested chemical equation reads as follows: 3 NO2 + H2O 2 HNO3 + NO

The amount of nitric acid (HNO3) that can be produced from the reaction of 92.0 g of NO2 with 36.0 g of water must be calculated.

NO2 has a molar mass of 46.01 g/mol, while H2O has a molar mass of 18.02 g/mol. NO2 moles are equal to 92.0 g / 46.01 g/mol, or 2.00 mol.

H2O molecular weight is equal to 36.0 g / 18.02 g/mol, or 2.00 mol.

To get 1.33 mol HNO3, divide 2.00 mol NO2 by (2 mol HNO3 / 3 mol NO2).

2.00 mol of H2O is converted into 84.0 g of HNO3 using the following equation: 2.00 mol H2O (2 mol HNO3 / 3 mol NO2) (63.01 g/mol HNO3). Hence, 84.0 g of nitric acid (HNO3) made by reacting 92.0 g of NO2 with 36.0 g of water.

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Answer:

The kind of bond formed depends on the identity of the bonding atoms and the shape of the molecule formed for covalent bonds.

Explanation:

There are various kinds of chemical bonds that could be present in a compound;

I) ionic bond

ii) covalent bond

iii) metallic bond

The kind of bond present in the compound depends on the elements involved in the bond. Metals and nonmetals mostly form ionic bonds win which electrons are transferred from metal to nonmetal.

Nonmetals commonly form covalent bonds with each other by sharing electrons in single, double and triple bonds. One may decide if the bond between two elements is ionic, covalent or polar covalent by looking at the electro negativity difference between the bonding atoms as well as the observed molecular geometry.

Finally, two metals are bonded by metallic bonds. This is the kind of bonds found in metallic crystals.

Answer:

I believe its c

Explanation:

i'm doing it on edge, let me know if i'm wrong

Answer:

The answer is C.)Protons have an electrical charge, but neutrons have no charge.

Explanation:

I got it right on edge

Answer:

B

Explanation:

found it from a person wjwjdjjanqnqq

The ketone that can be shown by the description have been shown in the image attached.

A strong analytical method known as mass spectrometry can reveal important details about the make-up, structure, and characteristics of molecules. It enables researchers to pinpoint and examine a sample's chemical and isotopic features.

The mass of a molecule or an ion can be precisely determined using mass spectrometry. The mass-to-charge ratio (m/z) measurement enables the recognition and verification of a compound's molecular formula. Particularly relevant to the study of pharmaceutical analysis, biochemistry, and organic chemistry.

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An object is said to be acted upon by an unbalanced force only when there is an individual force that is not being balanced by a force of equal magnitude and in the opposite direction.

An unbalanced force refers to a situation where the net force acting on an object is not equal to zero, which causes the object to accelerate in a particular direction. In other words, when the forces acting on an object are unbalanced, the object will either speed up, slow down, or change direction.

According to Newton's Second Law of Motion, the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass. Therefore, when an unbalanced force acts on an object, it will experience an acceleration proportional to the force applied. an unbalanced force is a force that causes an object to accelerate in a particular direction due to an imbalance in the forces acting on it.

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The energy can be identified by their features, characteristics and impacts on the surrounding environment.

If the energy release heat then we can say that it is a thermal energy because it warms the environment whereas if the energy produce light then it is called radiant energy.

If the energy is released from splitting atoms or fusion of atoms so we can say that it is a nuclear energy. If the energy is released from breaking of bonds of atoms and molecules, so it is Chemical energy.

So we can conclude that the energy can be identified by their features, characteristics and impacts on the surrounding environment.

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The percent yield of a reaction is 53.8% that can be calculated as shown below.

The chemical reaction is depicted as follows:

PCl₃ + 3H₂O → 3HCl + H₃PO₃.

The number of moles of a substance equals the ratio of its given mass in a chemical response to the mass of 1 mole of that substance. One mole of any substance equals Avogadro's number, that is, 6.023 × 1023. It is likewise used to specific attention gadgets inclusive of mole consistent with litre or molecular weight.

m(PCl₃) = 200 g.

m(HCl) = 86.0 g.

n(PCl₃) = m(PCl₃) ÷ M(PCl₃).

n(PCl₃) = 200 g ÷ 137.33 g/mol.

n(PCl₃) = 1,46 mol.

n(HCl) = m(HCl) ÷ M(HCl).

n(HCl) = 86.0 g ÷ 36.45 g/mol.

n(HCl) = 2.35 mol.

From reaction: n(PCl₃) : n(HCl) = 1 : 3.

n(HCl) = 1.46 mol · 3 = 4.38 mol.

Yield of reaction: 2.35 mol ÷ 4.38 mol · 100% = 53.8%.

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The theoretical yield of iron metal : 16.418 g

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

Reaction

2 Fe₂O₃ + 3 C ⇒ 4 Fe + 3 CO₂

mol Fe₂O₃ (MW=159,69 g/mol) :

\(\tt \dfrac{23.5}{159.69}=0.147\)

mol  Fe₂O₃ : mol Fe = 2 : 4

mol Fe :

\(\tt \dfrac{4}{2}\times 0.147=0.294\)

mass Fe(the theoretical yield) :

\(\tt 0.294\times 55.845~g/mol=16.418~g\)

Answer:

The correct answer with signfigs is 16.4 for the first part

The second box is 88.4

Explanation:

Answer:

A simple microscope is one that uses a single lens for magnification, such as a magnifying glass while a compound microscope uses several lenses to enhance the magnification of an object. It uses a lens to enlarge an object through angular magnification alone, giving the viewer an erect enlarged virtual image.

If its wrong correct me.

Answer:has one lens only

Explanation:

Answer:

it is c

Explanation:

Answer:

Lysosome

Explanation:

The lysosome of a cell removes waste and deports it to the Golgi Apparatus to remove completely

The chemical equation of the production of ammonia is shown in figure 1 and it shows that the mole ratio for ammonia and nitrogen gas is 2:1.

What is mole ratio?

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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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Answer:

C: Ability to react. Sorry if its wrong!

Explanation: