draw a possible structure for the ir spectrum given below. the molecular formula of the compound is c4h6o2.

A chemist is attempting to identify an unknown compound by determining the mass percent of calcium in an unknown sample. So calcium bromide is the unknown calcium compound.

Compound is defined as a chemical compound made up of many similar molecules bound together by chemical bonds and contains atoms from multiple chemical elements Therefore, a molecule made up of only one type of atom is not a compound.

After dividing the mass of the element in 1 mole of the compound by the compound's molar mass, the result is the mass percent of the element in the compound, which is then multiplied by 100.  Subtract the empirical formula for molar mass from the molar mass of the chemical.

Thus, a chemist is attempting to identify an unknown compound by determining the mass percent of calcium in an unknown sample. So calcium bromide is the unknown calcium compound.

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Peanuts, or milk please leave like if right

Answer:

air

Explanation:

A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.

The total mass of the solution is   0.100025 Kg. Hence, the concentration in parts per million is 246.93 ppm.

Parts per million or ppm is  a term used to express the concentration of a solution. The concentration of the a solution can be expressed in terms of the mass , volume or number of moles of the solute in the solution.

ppm of a solution = weight of solute in kg/weight of solution in kg ×10⁶.

Given , mass of solute lead nitrate = 0.025 g

mass of solvent = 100 g.

total mass of the solution = 100 + 0.025 = 100.025.g

mass in kg =   0.100025 Kg.

mass in kg of solute = 0.000025 Kg

ppm of solution  = 0.000025 kg/   0.100025 Kg ×10⁶. = 249.9 ppm.

Therefore, the concentration of the solution in ppm is 249.9 ppm.

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Answer:

1

atom of

Cu

has a mass of

1.055

×

10

−

22

g

.

Explanation:

1 atom Cu

⋅

1 mol Cu

6.022

×

10

23

atoms Cu

⋅

63.546 g Cu

1 mol Cu

=

1.055

×

10

−

22

g Cu

1 atom of copper must be converted in moles to express it as a quantity that can be converted into grams (our second step).

Avogadro's Number

(

1 mole

=

6.022

×

10

23

particles

)

and the relative atomic mass of copper

(

1 mole of copper = 63.546 g

)

are the equalities required to make this conversion.

Explanation:

The temperature (in °C) that the ideal gas shifted to is -270.38 °C.

Given data:Initial Temperature, T1 = -15.50 °C = 257.65 K

Initial Pressure, P1 = 4.620 atm

Final Pressure, P2 = 8.710 atm

Initial Volume, V1 = 35.00 L

Final Volume, V2 = 15.00 L

We need to calculate the final temperature, T2.

As the gas is assumed to be an ideal gas, we can use the combined gas equation to solve the problem, that is,

P1V1 / T1 = P2V2 / T2

Let's substitute the values,P1V1 / T1 = P2V2 / T2

(i)At initial conditions, P1V1 / T1 = 4.620 × 35.00 / 257.65 = 0.6294

At final conditions, P2V2 / T2 = 8.710 × 15.00 / T2 = 1.742

Now, let's substitute this value in equation (i)0.6294 = 1.742 / T2T2 = 1.742 / 0.6294= 2.77 K or -270.38 °C

Answer:The temperature (in °C) that the ideal gas shifted to is -270.38 °C.

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Explanation:

The force of friction is proportional  to the normal force =  mg cos (angle)

   as the angle increases ( shorter incline) the normal force becomes less ( so friction is less)

       the steep ramp is shorter and the force of friction is less  so the longer, less inclined plane will waste more work because friction is higher and ramp is longer.

Another way to look at it....as the ramp becomes steeper and steeper it becomes closer to being vertical....when there would be no friction...thus less wasted work on friction

Yes, we can see parallels to the modification of basic ideas in other kinds of human pursuits or experiences.

For example, when we look at the development of technology, we can see how early versions of an invention are gradually modified and improved upon over time.

Another example is the evolution of language—the way that words and phrases are adopted, adapted, and changed to fit the needs of a particular culture or time period. We also see this kind of evolution in the development of art and music, as different styles and influences are blended and combined to create something new and unique.

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Answer:

D because electron is negatively charge around the nucleus

electrons are found outside the nucleus

An atoms is composed of electrons, protons and neutrons. Protons and neutrons are attached within the nucleus whereas electrons are in the cloud around the nucleus. Thus, option D is correct.

Atoms are the basic units of every substance. Atoms are composed of subatomic particles electrons, neutrons and protons.  Protons and neutrons are located inside the nucleus where as electrons are revolving around the nucleus.

The core of an atom is called nucleus. The protons are positively charged and the neutrons are neutral. Electrons are negatively charged particles and they are revolving around the nucleus through circular paths of fixed energy called orbits.

The region where we can find an electron inside an atom is called an orbital. Electrons experience an attractive pull  from the positively charged nucleus and thus electrons are existing in a cloud of electrostatic force around nucleus.  

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The LD50 (Lethal Dose 50) is a measure used in toxicology to determine the lethal dose of a substance that would cause death in 50% of the test population.

However, it is important to note that conducting experiments to determine the LD50 of a substance on humans is unethical and illegal. The LD50 values are typically determined through animal testing, usually on rodents such as rats or mice.To calculate the amount of a substance that would harm a person of a certain weight, various factors need to be considered, including the toxicity of the substance and the individual's weight. In toxicology, a commonly used measure is the oral median lethal dose (LD50) expressed as milligrams per kilogram of body weight (mg/kg).To estimate the harmful dose for an individual of a certain weight, you would need to know the LD50 value of the substance and apply it to the weight of the person. The calculation involves multiplying the LD50 value by the person's weight in kilograms. However, it is crucial to emphasize that estimating harmful doses for humans based on animal LD50 values alone can be inaccurate and potentially dangerous.

It is essential to consult professionals in toxicology or poison control centers to obtain accurate information regarding the toxicity of a substance and its potential effects on human health.

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Answer:

Biosphere

The Biosphere --contains all the planet's living things. This sphere includes all of the microorganisms, plants, and animals of Earth. Within the biosphere, living things form ecological communities based on the physical surroundings of an area.

Explanation:

Answer:

Biosphere

Explanation:The Biosphere --contains all the planet's living things. This sphere includes all of the microorganisms, plants, and animals of Earth. Within the biosphere, living things form ecological communities based on the physical surroundings of an area. hope this helps (:

Answer:the branch of science which examines the material of the universe and changes that these materials undergo

Chemistry deals with composition,structure,properties of matter and changes that these materials undergo

Answer:

It is nb 2 as i think . Good luck

Answer:

10.3

Explanation:

Answer:

i think its D

Explanation:

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.

Taking into account the law of conservation of mass,

The Law of Conservation of Matter is also called the law of conservation of mass or the Law of Lomonósov-Lavoisier. This law postulates that "The mass is not created or destroyed, only transformed."

This means that the reagents interact with each other and form new products with different physical and chemical properties than those of the reagents. And this is because the atoms of the substances are ordered differently.

But the quantities of the masses involved in a given reaction must be constant throughout it, that is, they will not have changed in their proportions when the reaction ends. Then the mass before the chemical reaction is equal to the mass after the reaction.

The exception to the rule is nuclear reactions, in which it is possible to convert mass into energy and vice versa.

Finally, the correct answer is option A. because the atoms of the substances are ordered differently, this is the reagents interact with each other and form new products.

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As a gaseous element condenses, the atoms become closer together and they have more attraction for one another.

The transformation of water vapour into liquid is known as condensation. The process is the opposite of evaporation, in which liquid water turns into a vapour. Either the air is chilled to its dew point or it gets too saturated with water vapour to retain any more water, causing condensation to occur.

Attraction - Gas Particles move continuously in a straight path in a gas. They are significantly further apart and move independently of one another because the kinetic energy of the molecule is larger than the attraction force between them. There are often almost no attractive forces between particles.

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The percentage by mass of oxygen in the 25.3 g sample of the unknown compound is 3.16%

From the question given above, the following data were obtained:

Mass of compound = 25.3 g

Mass of oxygen = 0.8 g

The percentage of oxygen in the compound can be obtained as follow:

\(Percentage = \frac{mass of element}{mass of compound } *100\)

Percentage of oxygen = \(\frac{0.8}{25.3} * 100\)

Thus, the percentage of oxygen in the compound is 3.16%

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The mass of sodium chloride  that is present in a liter of  solution that has 4.50 x 10⁻⁶ kg of sodium per liter is 45 mg.

The mass  of sodium chloride in milligrams that is presents in a liter of  solution that has 4.50 x 10⁻⁶ kg of sodium per liter is calculated as follows:

Mass concentration of sodium chloride solution =  4.50 x 10⁻⁶ kg of sodium chloride per liter.

Volume of solution = 1 liter

Mass of sodium chloride =  4.50 x 10⁻⁶ kg/L * 1 L

mass of sodium chloride =  4.50 x 10⁻⁶ kg

mass of sodium chloride =  4.50 x 10⁻⁶ kg * 1000000 mg/kg

mass of sodium chloride =  45 mg

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Answer:

yes, coal for example produces energy by burning but there are several alternatives such as water or solar which are 2 growing energy sources.

Explanation:

hope this helps!

Answer:

Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products.

A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Chemical reactions are an integral part of technology, of culture, and indeed of life itself. Burning fuels, smelting iron, making glass and pottery, brewing beer, and making wine and cheese are among many examples of activities incorporating chemical reactions that have been known and used for thousands of years. Chemical reactions abound in the geology of Earth, in the atmosphere and oceans, and in a vast array of complicated processes that occur in all living systems.

Explanation:

hope it help

plss brainlys me

Answer:

Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products

Explanation:

Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

The composition of the sigma bonds in methane i.e. the atomic orbits comprise the molecular orbit is σsp³-sp³

Methane is a one-carbon compound in which carbon is attached to four hydrogen atoms by single bonds. It is colorless, odorless, non-toxic, but a flammable gas (bp -161°C). It serves as a fossil fuel, a member of greenhouse gases, and a bacterial metabolite. In the methane molecule, a carbon atom forms covalent bonds with four different hydrogen atoms. There are no lone pairs of electrons in carbon atoms. So the 4 hydrogen atoms are at the 4 corners of the tetrahedron and the carbon is at the center of the tetrahedron. Hybridization in the methane molecule occurs by mixing one orbital with three p-orbitals. Each orbital consists of an unpaired electron. Carbon's s orbital and three p orbitals overlap with her 1s orbital of hydrogen to form a bond. Therefore, methane hybridizes to sp3 resulting in tetrahedral geometry. The methane molecule is non-polar. In particular, the dipole moment of methane is zero. A dipole moment of zero means that the "center of negative charge" in the molecule corresponds to the "center of positive charge".

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To determine the number of valence electrons in acetone (CH₃C(O)CH₃) and draw the corresponding Lewis structure, follow these steps:

1. Count the total number of valence electrons from all the atoms:
- Carbon (C) has 4 valence electrons, and there are 3 carbon atoms, so 4 x 3 = 12.
- Hydrogen (H) has 1 valence electron, and there are 6 hydrogen atoms, so 1 x 6 = 6.
- Oxygen (O) has 6 valence electrons, and there is 1 oxygen atom, so 6 x 1 = 6.

Add all the valence electrons together: 12 + 6 + 6 = 24 valence electrons.

2. Draw the Lewis structure:
- Place the central atom, which is the carbon atom connected to the oxygen atom, in the middle.
- Connect the two other carbon atoms to the central carbon with single bonds.
- Connect the oxygen atom to the central carbon with a double bond.
- Attach three hydrogen atoms to each of the two outer carbon atoms with single bonds.

Your final Lewis structure for acetone (CH₃C(O)CH₃) should look like this:

     O
     ||
H - C - C - H
 |       |
H - C - H

In this structure, you have used all 24 valence electrons, and all atoms have complete octets.

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The glacial acetic acid is used to shift the equilibrium towards the products and obtaining high yields of Isopentyl acetate.

Traditionally, an esterification is carried out using more alcohol.

In order to alter the balance in favour of the products and produce isopentyl acetate in large quantities, extra acetic acid is utilised in the production process. Additionally, acetic acid is less expensive than isopentyl alcohol.

Along with the water, the water is purified in glacial acetic acid. The synthesis will have a significant impact on the equilibrium and result in little ester as long as there is water in an acetic acid solution. Therefore, glacial acetic acid is superior to regular acid.

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So, to summarize, the rate of disappearance of b is faster than the rate of production of c in the given reaction. In other words, for every unit of time, three times more b is consumed than c is produced.

To answer this question, we need to understand the concept of reaction rates. The rate of a chemical reaction is defined as the amount of reactant consumed or product formed per unit time. In the given reaction, we have one reactant, b, and one product, c.
According to the balanced chemical equation, for every three moles of b consumed, two moles of c are produced. Therefore, we can say that the rate of disappearance of b is three times the rate of production of c. This can be explained by the fact that the reaction consumes three moles of b to produce two moles of c.
In conclusion, the rate of a chemical reaction depends on the stoichiometry of the reaction, i.e., the balanced chemical equation. In this case, the ratio of coefficients tells us that the rate of disappearance of b is three times the rate of production of c.

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Answer:

0.172 M

Explanation:

The reaction scheme is as follows:

Styrene (monomer) + Azobisisobutyronitrile (initiator) →  Radical polymers + Nitrile groups

Radical polymers then undergo combination or disproportionation as the possible modes of termination:

Combination:

Radical polymers + Radical polymers → Polystyrene (end product)

Disproportionation:

Radical polymers → Polystyrene + Styrene (monomer)

Polymerization of styrene is a chain-growth process initiated by thermolysis of azobisisobutyronitrile, which is a free radical initiator.

During the reaction, styrene molecules act as the monomers, while azobisisobutyronitrile molecules provide the initiating radicals, which combine to form a growing polymer chain.

These polymer chains can either terminate through combination, where two growing chains react with each other and form a new polymer chain, or through disproportionation,

where a growing polymer chain reacts with a styrene molecule to form a new polymer chain and a styrene molecule.

Thermolysis, which is the decomposition of molecules due to high temperature, is the mechanism of initiation of the polymerization of styrene.

This process breaks down the azobisisobutyronitrile molecules into the two radicals, which act as the initiators for the polymerization.

The two possible modes of termination, combination and disproportionation, then occur, resulting in the formation of polystyrene as the end product.

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just need points lol

The fact that there are more possible combinations for amino acids than the number of amino acids themselves implies that each amino acid can be encoded by multiple codons.

A codon is a sequence of three nucleotides in DNA or RNA that corresponds to a specific amino acid.

There are 20 standard amino acids used to build proteins in living organisms. However, there are 64 possible three-letter combinations of nucleotides (4³) that can be used to form codons. This means that on average, there are more than three codons that can encode each amino acid.

To calculate the number of codons per amino acid on average, we divide the total number of codons (64) by the number of amino acids (20). Therefore, the average number of codons per amino acid is 64/20 = 3.2.

This indicates that there is a degeneracy or redundancy in the genetic code, where multiple codons can specify the same amino acid.

For example, the amino acid leucine is encoded by six different codons (UUA, UUG, CUU, CUC, CUA, CUG), while methionine and tryptophan are each encoded by a single codon.

In conclusion, the existence of more possible combinations for amino acids than amino acids themselves means that the genetic code is degenerate, allowing for redundancy and flexibility in protein synthesis.

This redundancy helps to protect against errors in DNA replication and transcription and allows for evolution to occur through the accumulation of genetic variations.

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Answer:

animal cell

Explanation:

Cytokinesis -

It refers to the process of cell division, which takes place during mitosis, is known as cytokinesis.

The process of cytokinesis is different for animal cell and plant cell.

Hence, from the given information of the question,

The correct answer is animal cell.

Answer:

200 kPa

(it is actually 199.999, but rounding up it is 200)

hope this helps!

Answer:

1500 Torr is  about 200 kPa