when two atoms share one or more pairs of electrons, a covalent bond is formed. group of answer choices true false

Answer:

C9H13O3N

Explanation:

Take the atomic mass of C=12.0, H=1.0, O=16.0 and N=14.0.

We can draw a chart (please view this on desktop so to avoid spacing errors):

Let the mass of Epinephrine be 100g.

                             C                       H                          O                              N

mass(g) :              59                      7.15                    26.2                         7.65

no. of moles : 59/12 =4.9167     7.15/1 = 7.15     26.2/16=1.6375 7.65/14=0.5464

(n.o.m. = mass/molar mass)

Ratio:   4.9167/0.5464 =9    7.15/0.5464=13      1.6375= 3      0.5464/0.5464 =1

(divide the n.o.m. by the smallest n.o.m., which is 0.5464 in this case, take the whole numbers)

So, the empirical formula will be: C9H13O3N

But this is still not yet the molecular formula. We have to ensure the molar mass is 183g/mol. Multiply the empirical formula by n.

So, let the molecular formula of Epinephrine be (C9H13O3N)n.

12x9n + 1x13n + 16x3n + 14n = 183

108n + 13n + 48n + 14n = 183

183 n = 183.

n = 1

Hence, the molecular formula is C9H13O3N.

Ques: how to identify physical or chemical properties

Ans:  you can identify them by their properties. make sure that it matches its property. but you must know the physical and chemical properties . i will give an example .so how to identify boiling of eggs and changing of water into ice. Physical properties

-it can be reversed back

-it is temporary change

-no new substance is formed

chemical properties

-it cannot be reversed back

-it is permanent change

-new substance  is formed

now boiling of eggs matches all property of chemical change so it is chemical change. changing of water to ice matches all property of physical change so it is physical change.

hope it helps

Explanation:

asexual reproduction involves 1 parent and produces offspring that are genetically identical to each other and parent.

Sexual reproduction involves 2 parents and produces offspring that are genetically unique.

Avogadro's number

1 mole = 6.02.10²³ particles (atoms, molecules, ions)

\(\tt 1.87\times 10^{24}\div 6.02\times 10^{23}=\boxed{\bold{3.11~moles}}\)

One mole of copper contains 6.02 × 10²³ copper atoms. Therefore, the number of moles that contains 1.87 ×10²⁴ copper atoms is 3.1 moles.

The number of atoms that constitutes one mole of a substance is called Avogadro number. It is equal to  6.02 × 10²³. Thus, one mole of every elements contains Avogadro number of atoms.

Similarly, one mole of a compound contains  6.02 × 10²³ number of molecules. Thus, one mole of carbon dioxide contains these much molecules.

Given the number of atoms of copper = 1.87 ×10²⁴

Then, no.of moles = number of atoms/ Avogadro number.

no.of moles =1.87 ×10²⁴ /6.022 × 10²³  = 3.1 moles.

Therefore, the number of moles of copper that contains 1.87 ×10²⁴ atoms is 3.1

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The signal words for each compound are a. Ammonium carbonate: Warning, b. Calcium chloride: Warning, c. Calcium nitrate: Danger, d. Potassium carbonate: Warning and e. Sodium carbonate: Warning.

To answer the question, we will look up the Safety Data Sheets (SDS) for each compound and find the appropriate signal word. The signal word indicates the hazard level of a chemical substance:

a. Ammonium carbonate - The SDS for ammonium carbonate indicates that the signal word is "Warning."

b. Calcium chloride - According to the SDS for calcium chloride, the signal word is "Warning."

c. Calcium nitrate - The SDS for calcium nitrate states that the signal word is "Danger."

d. Potassium carbonate - Upon checking the SDS for potassium carbonate, the signal word is "Warning."

e. Sodium carbonate - The SDS for sodium carbonate reveals that the signal word is "Warning."

To summarize, here are the signal words for each compound:

a. Ammonium carbonate: Warning
b. Calcium chloride: Warning
c. Calcium nitrate: Danger
d. Potassium carbonate: Warning
e. Sodium carbonate: Warning

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Answer:

According to Charles law

Explanation:

volume is directly proportional to absolute temperature

The balanced chemical equation for oxidation of glucose is

C6H12O6  + [6 ]O2  ----> [6]H20 (l) +  [6]CO2 +Energy and

combustion of butane is,

[2]C4H10 (g) + [13]02 (g) --->  [8]H2O (l)  +[ 10] CO2 (g)

C6H12O6(s) + O2 (g) ----> H2O + CO2 (g).

Balancing the chemical reaction it becomes,

C6H12O6  + 6O2  ----> 6H20 (l) +  6CO2 +Energy

This is a combustion reaction. This is an aerobic respiration equation. The glucose is converted into pyruvic acid in the cytoplasm which is further sent to mitochondria. This further oxidation into carbon dioxide and water along with the production of energy.

C4H10 (g) + 02 (g) --->  H2O (l)+ CO2 (g)

Balancing the chemical reaction becomes,

2C4H10 (g) + 1302 (g) --->  8H2O (l)  + 10 CO2 (g)

This is a combustion reaction. In this reaction, butane burns completely in oxygen. In this Alkane yield carbon dioxide  and water.in the reaction all the charges are balanced. This involves balancing the carbon as carbon dioxide and hydrogen as water.

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(a.) Radius of the buckminsterfullerene molecule treated as a hard sphere is 25.1022 pm.

(b.) There are tetrahedral and octahedral holes in which K1 ions lie.

a. The radius of the buckminsterfullerene molecule can be calculated using the information provided. In a face-centered cubic (FCC) lattice, the length of the side of the unit cell (a) is related to the radius (r) of the atoms/molecules by the formula: a = 4√2r. Rearranging the formula, we can solve for the radius (r):

r = a / (4√2).

= 142 / (4√2)

= 25.1022 pm.

b. In the compound K3C60, the K1 ions are positioned in the holes of the C6032 face-centered cubic lattice. To determine the type of holes in which the K1 ions lie, we need to consider the packing arrangement of the C6032 units. In an FCC lattice, there are two types of holes: tetrahedral and octahedral.

Since the K1 ions are larger than the C6032 units, they will occupy the larger octahedral holes. This is because the K1 ions cannot fit into the smaller tetrahedral holes due to their size. Therefore, the K1 ions lie only in the octahedral holes.

To calculate the percentage of those octahedral holes that are filled, we can use the formula:

(number of K1 ions / total number of octahedral holes) × 100%.

The total number of octahedral holes in an FCC lattice is equal to the number of atoms/molecules in the lattice. For K3C60, since there are three K1 ions for each C6032 unit, the number of K1 ions is three times the number of C6032 units.

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Answer:

chemical, is the answer your looking for

A pressure of 0.200 atm is same as 20265 Pa when converted in pascals, similarly it is equivalent to 202.65 mbar, 20.265 kPa, 152 mmHg, 2.907 psi and 152 Torr.

Given the pressure = 0.200atm

Atmospheric pressure, also known as barometric pressure, is the pressure exerted by the weight of air in the atmosphere of Earth. It is measured by a barometer in units of millibars (mb) or hectopascals (hPa).

The different units of atmosphere are Pascals (Pa), Bars (bar), Millibars (mbar), Atmospheres (atm), Millimeters of Mercury (mmHg), Kilopascals (kPa), Torr (Torr) and Pounds per Square Inch (psi)

The pressure of 0.200 atm can be converted to different units by multiplying it with the conversion factors of the respective units.

Pascal (Pa): 0.200 atm x (\(1.01325 * 10^5 Pa/atm\)) = 20265 Pa

Millibar (mbar): 0.200 atm x (1013.25 mbar/atm) = 202.65 mbar

Kilopascal (kPa): 0.200 atm x (101.325 kPa/atm) = 20.265 kPa

Millimeter of Mercury (mmHg): 0.200 atm x (760 mmHg/atm) = 152 mmHg

Pounds per Square Inch (psi): 0.20 atm x 14.535 psi/atm = 2.907 psi

Bars (bar): 0.200 atm × 1.01325 bar/atm = 0.206650 bar

Torr (Torr): 0.20 atm x 760 Torr/atm = 152 Torr

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Answer:polyatomic molecules

Explanation:molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance.Characteristics of molecules

The division of a sample of a substance into progressively smaller parts produces no change in either its composition or its chemical properties until parts consisting of single molecules are reached. Further subdivision of the substance leads to still smaller parts that usually differ from the original substance in composition and always differ from it in chemical properties. In this latter stage of fragmentation the chemical bonds that hold the atoms together in the molecule are broken.

Answers are;

Starting material

Source of halogen

Oxidizing reagent

Acid catalyst,

Solvent.

A more detailed explanation of the answer.

Acetanilide is the starting material used in the experiment to prepare 4-bromoacetanilide.

Sodium bromide is a halogen source that helps in the formation of the 4-bromoacetanilide by providing the bromine atoms.

Sodium hypochlorite is used as an oxidizing agent in the experiment.

Acetic acid is used as a catalyst in the experiment, which increases the reaction rate of the conversion of acetanilide to 4-bromoacetanilide.

Ethanol is used as a solvent in the experiment, which helps in dissolving the reactants in the experiment, and also helps in the formation of the 4-bromoacetanilide.

Sodium hypochlorite, also known as bleach, is used as an oxidizing reagent in the experiment to convert the acetanilide to 4-bromoacetanilide through an electrophilic aromatic substitution reaction.

Hence, the answer is: Starting material, source of halogen, oxidizing reagent, acid catalyst, solvent.

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Answer:

As

Explanation:

because of ionic bond

The components of a chemical equation that are left after the spectator ions are removed are the net ionic equation.

This equation only includes the ions that actually participate in the chemical reaction, while the spectator ions do not undergo any change and can be eliminated from the equation.

A chemical equation is a representation of a chemical reaction using chemical formulas and symbols to show the reactants and products involved in the reaction. It is written using a combination of chemical symbols, numbers, and other symbols to indicate the reactants and products involved in the reaction, as well as the stoichiometry of the reaction. For example, the chemical equation for the combustion of methane in the presence of oxygen to form carbon dioxide and water is:

CH4 + 2O2 → CO2 + 2H2O.

The reactants are written on the left-hand side of the equation, while the products are written on the right-hand side. The numbers in front of the chemical formulas, known as coefficients, indicate the relative amounts of each substance involved in the reaction

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The equilibrium constant, Kp, for the reaction cannot be determined without knowing the equilibrium pressures of gases B and C in addition to the initial and equilibrium pressure of gas A.



To calculate the value of Kp, which is the equilibrium constant in terms of partial pressures, we need to use the given equilibrium pressures and the stoichiometric coefficients of the balanced equation.The equilibrium constant expression for the reaction is Kp = (P(B) * P(C)^2) / (P(A)^2), where P(A), P(B), and P(C) are the partial pressures of gases A, B, and C, respectively.

Given that the initial pressure of A is PA = 240 mmHg and the equilibrium pressure of A is PA = 55 mmHg, we can substitute these values into the Kp expression.Kp = (P(B) * P(C)^2) / (P(A)^2) = (55 * P(B) * P(C)^2) / (240^2)

To solve for Kp, we need additional information about the equilibrium pressures of B and C. Without that information, we cannot determine the exact value of Kp.

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This is not the best way to organize a periodic table because two elements might have similar atomic mass.

Periodic table is a chart in which arrangement of chemical elements are done.

In the early periodic table elements are arranged on the basis of their atomic masses, while after sometime Moseley arranged the periodic table on the basis of atomic number as he proposed that properties of an element is justified on the basis of number if electrons.

And mass of two substances may be same so it is difficult to differentiate between them.

Hence, two elements might have similar atomic mass.

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Answer:

Liquid water  

A radioactive substance decreases by 65% each hour. Find the hourly decay factor. The hourly decay factor is 0.35.

Chemicals in the class of radionuclides (also known as radioactive materials) have unstable atomic nuclei. They become stable by undergoing modifications in the nucleus (spontaneous fission, alpha particle emission, neutron conversion to protons, or the opposite).

A radioactive atom will naturally emit radiation in the form of energy or particles in order to transition into a more stable state. The difference between radioactive material and the radiation it emits must be made.

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The combination of functional groups that can produce a carbon-carbon bond includes alkynes, alkenes, and free radicals.

Alkynes are hydrocarbons with a triple bond between two carbon atoms, and they can undergo addition reactions to form carbon-carbon bonds. Alkenes, on the other hand, are hydrocarbons with a double bond between two carbon atoms, and they can also undergo addition reactions to form carbon-carbon bonds. Free radicals, which are highly reactive species with unpaired electrons, can also participate in reactions that lead to the formation of carbon-carbon bonds.

The formation of a carbon-carbon bond typically involves the interaction of specific functional groups. One such group is alkynes, which are characterized by a triple bond between two carbon atoms. Alkynes can undergo addition reactions, where the triple bond is broken, allowing new bonds to form with other carbon atoms or functional groups. These reactions enable the formation of new carbon-carbon bonds and are often used in organic synthesis.

Another functional group capable of forming carbon-carbon bonds is alkenes. Alkenes possess a double bond between two carbon atoms. Like alkynes, alkenes can undergo addition reactions, where the double bond is broken, leading to the formation of new carbon-carbon bonds. This process allows for the incorporation of additional carbon atoms or functional groups into the molecule.

In addition to alkynes and alkenes, free radicals can also participate in reactions that result in carbon-carbon bond formation. Free radicals are highly reactive species with unpaired electrons. They can initiate chain reactions, where a free radical attacks a carbon-carbon bond, forming a new bond with one of the carbon atoms involved. This mechanism allows for the creation of carbon-carbon bonds in various organic reactions.

In summary, the combination of functional groups that can produce a carbon-carbon bond includes alkynes, alkenes, and free radicals. Alkynes and alkenes undergo addition reactions, while free radicals initiate reactions by attacking existing carbon-carbon bonds. These processes enable the formation of new carbon-carbon bonds and are fundamental in organic chemistry and synthesis.

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Answer:

For anyone that still needs the answer it's:

2.) Inspect the Bunsen burner and gas tubing for damage.

3.) Move her lab notebook and papers so they are away from the burner.

Explanation:

2 and 3 is right on edge

Bunsen burners are the laboratory equipment used in experiments. Maria should inspect the burner and move her papers and book away before burning. Thus, options b and c are correct.

Bunsen burners are the equipment used in laboratories for heating and sterilizing processes. It is a device used to produce flames using atmospheric oxygen gas and fuel in the burner.

While using the bunsen burner, laboratory safety procedures should be practiced to ensure the safety of the person as well as the working place. Before igniting the burner should be inspected and checked for any leakages.

The notebooks and papers must be placed away from eh burner to avoid any fire accidents as they are easily flammable and can catch fire.

Therefore, options b and c. gas tubing must be inspected before lighting the burner.

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Answer:

b

Explanation:

i am smart

All elements are mostly pure substances. A few of them include gold, copper, oxygen, chlorine, diamond, etc. Compounds such as water, salt or crystals, baking soda amongst others are also grouped as pure substances.

Explanation:

\(\Large\textbf{C) Mixtures}\)

Epiphyseal plate is the layer of cartilage responsible for bone growth that ossifies into epiphyseal line.

Photographic superimposition compares photos, while craniofacial reconstruction creates 3D model of a person's face based on skeletal remains.

The teeth in skeletal remains of a 4-year-old child are primary, while those of an 8-year-old are a mix of primary and permanent.

Growth plate (epiphyseal plate) and cartilaginous line (epiphyseal line):

The growth plate, also known as the epiphyseal plate, is a layer of hyaline cartilage found in children's bones. It is responsible for bone growth and is located at the end of long bones. As the bone grows, the growth plate gradually ossifies and transforms into a bony structure called the epiphyseal line or cartilaginous line. The epiphyseal line is a marker of the cessation of bone growth, and it is commonly used to estimate a person's age at death during forensic investigations.

Photographic superimposition and craniofacial reconstruction:

Photographic superimposition is a technique used to compare two photographs of a person's face. One of the photographs is of the person when they were alive, and the other is a photograph of their skeletal remains. The photographs are superimposed, and the forensic analyst compares the two images to identify similarities and differences. This technique is used to identify a person based on their skeletal remains.

Craniofacial reconstruction is a technique used to create a three-dimensional model of a person's face based on their skeletal remains. This technique is used when the person's identity is unknown, and it involves creating a replica of the person's skull and using it as a basis for creating a facial reconstruction. The reconstruction is based on the person's sex, age, and ethnic background, and it is used to aid in the identification of the individual.

The teeth found in the skeletal remains of a 4-year-old child and the teeth found in the skeletal remains of an 8-year-old child:

The teeth found in the skeletal remains of a 4-year-old child and an 8-year-old child are different. At 4 years old, a child will typically have 20 primary teeth, also known as baby teeth. These teeth are smaller and have thinner enamel than permanent teeth, which begin to erupt around the age of 6. By the age of 8, a child will have a mixture of primary and permanent teeth, with 32 permanent teeth ultimately replacing the baby teeth. The permanent teeth are larger and have thicker enamel than the primary teeth. By examining the teeth found in the skeletal remains of a child, forensic analysts can estimate the child's age at death and identify any developmental abnormalities or trauma.

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Answer:

Neptune and Saturn although Neptune isn't on there so just Saturn.

hope it'll help ya out!

11,835.76 = 11.83576kg

683,763.88mg = 6.8376388hg

53.7m = 0.0537km

:) hoped this helped

brainlyest maybe?

The initial investment is $300 million, and the project is planned to operate for A0 years with an estimated salvage value of $20 million.

To calculate whether the city can recover the capital cost and other operating costs for the water-desalination plant, you can follow these step-by-step calculations:

Step 1: Calculate the annual revenue from selling water:

First, convert the water production from gallons to acre-feet:

Water production per day = 50 million gallons

Water production per year = 50 million gallons * 365 days = 18.25 billion gallons

Water production in acre-feet = 18.25 billion gallons / 325,851 gallons per acre-foot

Calculate the annual revenue from selling water:

Annual revenue = Water production in acre-feet * Price per acre-foot

Step 2: Calculate the annual operating and maintenance costs (excluding energy cost):

Operating and maintenance costs in the first year = $15 million

Calculate the annual operating and maintenance costs for subsequent years:

Operating and maintenance costs in year n = Operating and maintenance costs in year n-1 * (1 + Growth rate)

Step 3: Calculate the annual energy cost:

Energy cost per 10,000 gallons = $0.90

Calculate the annual energy cost:

Annual energy cost = Water production in gallons / 10,000 gallons * Energy cost per 10,000 gallons

Step 4: Calculate the annual cash flow:

Annual cash flow = Annual revenue - Annual operating and maintenance costs - Annual energy cost

Step 5: Calculate the present value of cash flows:

Use the present value formula to calculate the present value of cash flows over the A0 years:

PV = Annual cash flow / (1 + Interest rate)^Year

Step 6: Calculate the net present value (NPV):

NPV = PV - Initial investment

Step 7: Determine if the project is financially feasible:

If the NPV is greater than or equal to zero, the project is financially feasible and can recover the capital cost and other operating costs. If the NPV is negative, the project may not be able to recover the costs.

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Answer: Reactant

Explanation:

In simple wording, Water act as a reactant and it broke or we can say split the larger molecule in the smaller ones, The H and OH bonds are attached to the two products that are formed after the reaction. Another process in which water is used as an important reactant is photosynthesis.

When an electron moves from the nth to the mth energy level of a hydrogen atom, the wavelength of radiation emitted is calculated using the Rydberg formula.

The Rydberg formula is a formula used to calculate the wavelengths of the spectral lines of hydrogen. It is given as follows:

\(\[\frac{1}{\lambda }=R_{H}\left(\frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}}\right)\]\)\(\[\frac{1}{\lambda }=R_{H}\left(\frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}}\right)\]\)

where λ is the wavelength of radiation,

RH is the Rydberg constant for hydrogen (1.097 × 107 m−1),

n1 is the initial energy level, and

n2 is the final energy level.

Using the Rydberg formula, the wavelength of radiation emitted when an electron moves from the nth to the mth energy level of a hydrogen atom can be calculated as follows:

\(\[\frac{1}{\lambda }=R_{H}\left(\frac{1}{n^{2}}-\frac{1}{m^{2}}\right)\]\)

Where n is the initial energy level and m is the final energy level.

The wavelength of the radiation emitted can be found by inverting the above equation, as shown below:

\(\[\lambda =\frac{1}{R_{H}}\left(\frac{1}{n^{2}}-\frac{1}{m^{2}}\right)^{-1}\]\)

Therefore, the wavelength of radiation emitted from a hydrogen atom when an electron moves from the nth to the mth energy level is given by

\(λ = $\frac{1}{R_{H}}$ $\left(\frac{1}{n^{2}}$ - $\frac{1}{m^{2}}\right)^{-1}$\)

where n and m are the initial and final energy levels respectively.

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Answer:

The Resource Conservation and Recovery Act (RCRA; PL 94-580), the major federal law on waste disposal, was passed in 1976. Its primary goal was to "protect human health and the environment from the potential hazards of waste disposal." RCRA is also concerned with reducing the amount of waste generated, ensuring that wastes are managed properly, and conserving natural resources and energy. The RCRA regulates solid waste, hazardous waste, and underground storage tanks

Explanation: