Please answer fast, I will give brainliest if correct!

Answer: (B) CFCs were replaced with other products

Answer:

B

Explanation:

I don't have 1 sorry

The o-h peak overlaps with the sp3 c-h peaks between the ranges of 3000–3700 cm1.

What is infrared spectroscopy and what is its significance in the field of analytical chemistry?

Infrared spectroscopy is a technique used to determine the functional groups in an organic compound or sample. It measures the frequency range of radiation absorbed by the compound.

An infrared (IR) spectrum is a plot of the absorption of radiation by a compound in the infrared region of the electromagnetic spectrum. The absorption bands correspond to different vibrational modes of the compound.

Significance of IR spectroscopy in analytical chemistry

In analytical chemistry, IR spectroscopy is used to identify and quantify unknown substances by comparing their spectra with known spectra of similar compounds. It's also used to assess the purity of a compound and monitor chemical reactions. IR spectroscopy is particularly useful in the identification of organic compounds such as hydrocarbons, alcohols, and carbonyl compounds.

The range of the IR spectrometer is from 4000 to 5000 words.

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The O-H peak overlaps with the sp3 C-H peaks in proton nuclear magnetic resonance spectroscopy (NMR) when the chemical shift of the O-H peak is close to the chemical shift of the sp3 C-H peaks. The O-H peak is usually found in the range of 3200-3600 cm-1.

Whereas the sp3 C-H peaks are typically found in the range of 2800-3100 cm-1. These two regions are adjacent to each other, and there may be some overlap between them. The O-H peak usually overlaps with the sp3 C-H peaks in the proton NMR spectrum when the chemical shift of the O-H peak is similar to the chemical shift of the sp3 C-H peaks.

Infrared spectroscopy (IR) can also be used to detect O-H and sp3 C-H groups, but the O-H peak is usually much more intense than the sp3 C-H peaks in the IR spectrum. As a result, the O-H peak is rarely overlapped by the sp3 C-H peaks in the IR spectrum.

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Answer:

False

Explanation:

Mass number is the quantity of protons and neutrons within one atom while the atomic mass is the average mass of all isotopes of the element.

Answer:

false :)

Explanation:

Answer:

( NH4NO3 -> N2+O2+H2O)

Explanation:

40g= 14g+8g+X

x=18g

hope that helps :)

Answer:

xiyducjfuxudjfjfjjffjfhhfudjdjdjdudud

Answer:

I dont knew this question what level this question. are asking for a friend

Answer:B is the right answer

Explanation:

A man have to get their friend bond with someone they like a lot closer. Then, if the man is ready to confess his feeling, try buying his love of his life their favorite flower or favorite candy/food.

hope this help-(even though im a girl ;v;)

The empirical formula is obtained by compositons: Cl2Zn for the empircal formula of a compound, given that the compound is found to be 47.9% zinc and 52.1% chlorine by mass

Calculate the molar mass of each element: Cl=35.453, Zn=65.409

Cl=1.469551236848, Zn=0.73231512482992 when expressed in moles.

Identify the least mole value: 0.73231512482992

Multiplying all elements by their lowest value Cl=2.0067197672451, Zn=1

rounding to the nearest whole number Cl=2, Zn=1

Cl\(_{2}\)Zn for the empircal formula

The empirical formula, which is defined as the ratio of compositons of the least whole number of the components included in the formula, is the simplest formula for a compound compositons. The simplest formula is another name for it.

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Answer:

The hydroxide ion concentration in an aqueous solution, [OH-], in mol L-1, can be calculated if the pOH of the solution is known.

pOH is defined as the negative logarithm (to base 10) of the hydroxide ion concentration in mol L-1 pOH = -log10[OH-]

Explanation:

Answer:

- \(m_{Cl_2}=45.5gCl_2\)

- \(m_{Na}^{unreacted}=20.5g\)

Explanation:

Hello,

In this case, we consider the undergoing chemical reaction as:

\(2Na+Cl_2\rightarrow 2NaCl\)

Thus, for 75.0 grams of sodium chloride, the following grams of chlorine are required (consider their 2:1 molar ratio):

\(m_{Cl_2}=75.0gNaCl*\frac{1molNaCl}{58.44gNaCl}*\frac{1molCl_2}{2molNaCl}*\frac{70.9gCl_2}{1molCl_2} \\ \\m_{Cl_2}=45.5gCl_2\)

Then, for the unreacted grams of sodium, we first compute the actually reacted grams by considering the 2:2 molar ratio between sodium chloride and sodium:

\(m_{Na}=75.0gNaCl*\frac{1molNaCl}{58.44gNaCl}*\frac{2molNa}{2molNaCl}*\frac{23.0gNa}{1molNa} \\ \\m_{Na}=29.5gNa\)

Finally, we subtract:

\(m_{Na}^{unreacted}=50.0g-29.5g\\\\m_{Na}^{unreacted}=20.5g\)

Regards.

The number of moles of NaF produced in the reaction between sodium bromide and calcium fluoride is 5.35 moles (approx 5 moles).

To determine the number of moles of NaF produced in the reaction between sodium bromide and calcium fluoride when 550 grams of sodium bromide are used, we first need to write the balanced chemical equation for the reaction:

2 NaBr + \(CaF_2\) → 2 NaF + \(CaBr_2\)

We can then use the molar mass of sodium bromide and the given mass of sodium bromide to determine the number of moles of sodium bromide:

Number of moles of NaBr = mass of NaBr / molar mass of NaBr

= 550 grams / 102.89 grams/mol

= 5.35 moles

Since the balanced chemical equation tells us that 2 moles of NaBr are needed to produce 2 moles of NaF, the number of moles of NaF produced when 550 grams of NaBr are used is 5.35 moles of NaF.

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Answer:

sal5 water = kaka

Explanation:

because i need points ty man

If you encounter a liquid chlorine leak in a one-ton container, the first action you should take to reduce the severity of the leak is (b) Spray the container with water.

The correct action to take first to reduce the severity of a liquid chlorine leak in a one-ton container is to spray the container with water. This helps to disperse the chlorine and reduce its concentration in the air. Option a, applying a caustic solution, may react with the chlorine and create a more hazardous situation. Option c, spraying with an ammonia solution, can create toxic fumes. Option d, rotating the container, may cause the leak to spread to other areas. In the event of a spill or leak, immediately put on escape-type respirator and exit the area. Immediately report leaks, spills or failures of the safety equipment (e.g., ventilation system). Secure the cylinder in an upright position.

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Answer:

c

Explanation:

To find the mass percent composition of an element, divide the mass contribution of the element by the total mass then multiply by 100.

The total mass = 200.0 g

Phosphorus mass = 87.28 g

Oxygen mass = 112.72 g

%composition of P:

=> (87.28 g/200.0g)*100

=> 43.64 %

%composition of O:

=> (112.72g/200.0 g)*100

=> 56.36 %

Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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Answer:

They both combine with The help of valency, which is the combining capacity of elements

Explanation:

I find it easier to understand valency as part of the Bhor’s model of an atom.

In his model, it was stated that electrons are spread around the nucleus in such a way that there are rings around the model. Each ring has a n value. So, k has 1, l has 2, m has 3 and n has 4...

what you need to know to find the number of electrons in each ring is to solve the formula 2n squared

Then, the valency is the 8 minus the number of electrons in the outermost shell. Remember that 8 is max number I;outer most shell. If you try it out for oxygen, you will get the value of 2 remaining, which can be gained if combined with calcium.

Hope it helps

The receptor type used to detect decreases in temperature from 35°C to 20°C is the cold receptors.

Cold receptors are specialized nerve endings located throughout the body that detect changes in temperature. These receptors send signals to the brain, which then determines whether the environment is too hot or too cold.

Cold receptors are sensitive to temperatures below the body's normal temperature and act as an alert system for the body in order for it to respond and adjust to colder temperatures. The receptors are activated when temperatures are lower than the body's normal temperature and send signals to the brain to activate the body's cooling mechanisms.

The receptors can also detect sudden drops in temperature, such as when a person is exposed to chilly air. In order to protect against the cold, the body will start to shiver, as well as produce sweat and heat up the muscles. Cold receptors are important for the body to detect temperature changes and protect it from the cold.

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Answer:

Water,

Explanation:

Aquaporins are channels in the membrane that allow water to pass through via osmosis. Aquaporins are unique among the transporters because they are always open. Other channel transporters and carrier transporters open and close, depending on the circumstances.

Answer:

hello :3

A cold is a contagious upper respiratory infection that affects your nose, throat, sinuses and trachea (windpipe).

Explanation:

have a nice day :3

Answer:

when CO2 gas is passed through lime water it turns milky due to the formation of calcium carbonate which formula is CaCO3.

Ca(OH)2+ CO2------ CaCO3

when excess of carbon dioxide is passed through calcium carbonate calcium hydrogen carbonate is formed and solution become colourless.

CaCO3+CO2------ Ca(HCO3)

Explanation:

The Answer is a reaction between two acids

salt is not because it gets u dehydrated

Answer:

D

Explanation:

The bond energy of 2 molecules of H= 435 (A)

The bond energy of 1 mole of cl= 242 (B)

A + B = 677

The total bond energy in the products (2HCl) of the reaction is 854 kJ/mol. Option A is correct.

To calculate the total bond energy in the products of the reaction (HCl), we need to sum up the bond energies of all the bonds in the product molecules.

The reaction produces 2 moles of HCl for every 1 mole of H₂ and 1 mole of Cl₂ reacted.

Bond energies (kJ/mol):

H–Cl: 427 kJ/mol (2 moles in 2HCl)

Now, let's calculate the total bond energy in the products:

Total bond energy = (2 moles of HCl × bond energy of H–Cl)

Total bond energy = (2 × 427 kJ/mol)

Total bond energy = 854 kJ/mol

So, the total bond energy in the products (2HCl) of the reaction is 854 kJ/mol.

Hence, A. is the correct option.

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The simplest molar ratio in which lithium reacts with nitrogen is 6 moles of lithium to 1 mol of nitrogen.

What is molar ratio?

A molar ratio examines the ratio that exist between two chemical compounds showing the amounts in moles of the compounds involved in a chemical reaction.

Molar ratio = amount of a constituent in moles ÷ total amount of all constituents in a mixture in moles

Given:

Mass of lithium (Li) = 4.2 g

Mass of  nitrogen (N2) = 2.8 g

Total amount of mass = 7g

Moles = molecular weight  ÷  mass of water

Moles of lithium (Li) = 4.2 ÷ 7 = 0.60 mol

Moles of nitrogen (N₂) = 2.8 ÷ 7 =  0.10 mol

Therefore, ratio Li : N₂ = 0.60 : 0.10 = 6 : 1

6 Li + N₂

The balanced equation between lithium and nitrogen, to form lithium nitride = 6 Li + N₂ → 2 Li₃N₆L i + N₂ → 2Li₃N

In summary, the simplest molar ratio in which lithium reacts with nitrogen is 6:1

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Answer:

the third one

Explanation:

When you breathe in, you inhale oxygen and exhale carbon dioxide

In modern proteomic analysis, the amino acid sequence of a protein can be determined by methods such as mass spectrometry and Edman degradation.

Proteomics is the large-scale study of proteins, particularly their structures and functions. Determining the amino acid sequence of a protein is a fundamental aspect of proteomics, as it provides important information about the structure and function of the protein. Modern proteomic analysis has several methods for determining the amino acid sequence of a protein.

One such method is mass spectrometry, which involves the ionization and fragmentation of the protein into smaller peptide fragments, and the measurement of the mass-to-charge ratios of these fragments. By analyzing the mass-to-charge ratios of these fragments, the amino acid sequence of the original protein can be reconstructed.

Another method is Edman degradation, which involves the sequential removal of amino acids from the N-terminus of the protein and their identification through chemical reactions. These methods are both widely used in modern proteomic analysis and have greatly advanced our understanding of the structure and function of proteins.

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According to chemical equilibrium, the concentration of HF(g) in the equilibrium system under these conditions is 0.002×10⁻³ M.

Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in concentration of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to form back the reactants.

It is calculated as K=[products]/[reactant]=0.0059/2.1×10³=0.002×10⁻³

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