If you forgot to label your sample vials of salicylic acid and acetylsalicylic acid, how could you use 1H NMR to differentiate them?Identify key specific peaks (include approximate δ, relative ratio, splitting pattern) that would allow quick distinction between the two compounds.Note:You do not need to identify all peaks.

Answer:

First oil well in the United States, built in 1859 by Edwin L. Drake, Titusville, Pennsylvania.

The reaction which have bigger surface are will have reaction rate faster.

If the two samples of Mg(s) are equal, then the two amounts of HCl(aq) are equal, the operation conditions are the usually same (Temperature, pressure, etc.), the difference between the speed of reaction will only depend on the difference in the quality of mixing of the Mg(s).

When the particles of Mg are poorly distributed in the solution and are very close to each other, the surface that interacts with HCl is small and in result the speed of reaction is lower.

On the other hand, if the Mg is well mixed and the concentration of Mg is almost homogeneous in all the solution, the surface of reaction will be bigger and the speed of reaction higher than the other case.

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The camel consumed approximately 2.24 kg of protein from the Bermudagrass hay.

To calculate the amount of protein the camel consumed, we need to consider the dry matter basis of the hay. Here's how you can calculate it:

Calculate the dry matter weight of the hay:

Dry Matter Weight = Total Weight of Hay × Dry Matter Percentage

Dry Matter Weight = 18.3 kg × (83.4/100)

Dry Matter Weight = 18.3 kg × 0.834

Dry Matter Weight = 15.2442 kg

Calculate the protein content in the dry matter;

Protein Content = Dry Matter Weight × Protein Percentage

Protein Content = 15.2442 kg × (14.7/100)

Protein Content = 15.2442 kg × 0.147

Protein Content = 2.2414194 kg

Therefore, the camel consumed approximately 2.24 kg of protein from the Bermudagrass hay.

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Answer:

Provide more strength

Explanation:

Rust is metal that has been oxidised . Oxides are usually more fragile and porous than their crystals metal equivalents. Some oxides, such as Aluminum oxide, are useful because they have a thin, strong shell that protects the metal from further corrosion.

To determine the molar mass of the element, we will use the formula:$$\mathrm{Molar\ mass}=\frac{\mathrm{Density}}{\mathrm{Moles}/\mathrm{Volume}}$$Given:$$\mathrm{Density}=13.55\:\mathrm{g/cm^3}$$$$\mathrm{Moles}=1.16\:\mathrm{mol}$$$$\mathrm{Volume}=17.17\:\mathrm{cm^3}$$.

Given that, density = 13.55 g/cm3molar mass = ?mass of sample = density x volume$$\therefore \ \text{mass of sample} = \mathrm{density} \times \mathrm{volume}$$$$\Rightarrow\mathrm{mass} =13.55 \:\mathrm{g/cm^3} \times 17.17 \:\mathrm{cm^3}=232.7315\:\mathrm{g}$$Now, Molar mass is given by,$$\mathrm{Molar\ mass}=\frac{\mathrm{Density}}{\mathrm{Moles}/\mathrm{Volume}}$$$$\Rightarrow\mathrm{Molar\ mass}=\frac{13.55\:\mathrm{g/cm^3}}{1.16\:\mathrm{mol}/17.17\:\mathrm{cm^3}}=103.1\:\mathrm{g/mol}$$Therefore, the molar mass of the element is 103.1 g/mol.

The given information is about the element's sample. The formula for molar mass is used to find out the unknown molar mass of the given element.

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Answer:

i am not sure but

Explanation:

b and c should be correct

Answer:b and D

Explanation:

The volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm is 7.81L.

The volume of a gas can be calculated using the following formula:

PV = nRT

Where;

V = 0.323 × 0.0821 × 265 ÷ 0.900

V = 7.027 ÷ 0.9

V = 7.81L

Therefore, the volume that a 0.323-mol sample of a gas will occupy at 265 K and a pressure of 0.900 atm is 7.81L.

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Answer:

homogeneous mixture

There is no element that is exclusively found only in the human body. Elements found in the human body are also present in various forms throughout the Earth's crust, atmosphere, and other living organisms. However, there are elements that are essential for human life and play crucial roles in our body's biological processes.

Some key elements found in the human body include oxygen (O), carbon (C), hydrogen (H), and nitrogen (N). These elements make up a large percentage of our body's composition and are the building blocks for molecules like proteins, carbohydrates, and lipids. Other essential elements, such as calcium (Ca), phosphorus (P), potassium (K), sulfur (S), sodium (Na), chlorine (Cl), and magnesium (Mg) also play vital roles in maintaining our health and ensuring proper functioning of our cells.

In summary, while there isn't an element that is solely found in the human body, there are several elements that are crucial for our body's proper functioning and overall health. These elements can be found in various forms and quantities throughout the Earth and other living organisms as well.

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The statement which correctly describes the reactants and products of a chemical reaction is: A. The mass of the reactants must be equal to the mass of the products. The total number of moles of the reactants can be more or less than the total number of moles of the products.

LOCOM is an abbreviation for the law of conservation of mass and it states that mass is neither created nor destroyed in any chemical reaction. Thus, the mass of any substance in a balanced chemical equation would remain the same at the end.

According to the law of conservation of mass (LOCOM), the mass of all the reacting chemical elements of any substance (reactants) must be equal to the mass of the product formed during a chemical reaction.

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Answer:

1) The percentage of oxygen in dry air is _______

C. 21

2) The composition of the Earth’s earliest atmosphere was different to that of the present atmosphere. Which of these gases was present in large amounts in the Earth’s earliest atmosphere?

B. CARBON DIOXIDE

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Answer: The percentage of oxygen in dry air is .  21

Explanation:  Ammonia gases was present in large amounts  in the easth7s earliest atmosphere

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Answer:That all noble gases will have 8 valence electrons which makes a atom stable

Explanation:

Proton:

Positive

Found in Nucleus

Mass of 1 AMU

Neutron:

Neutral

Found in Nucleus

Mass of 1 AMU

Electron:

Negative

Found in orbitals

Mass of 0 AMU

In a nucleophilic substitution reaction, a two-step mechanism involves first bond breakage to form a carbocation intermediate, followed by bond formation with the nucleophile.

In an SN1 reaction, the nucleophile attacks the substrate after the leaving group has departed, resulting in a two-step process. This reaction is generally favored by weak nucleophiles, as they are less likely to compete with the leaving group. On the other hand, an SN2 reaction involves a single concerted step in which the strong nucleophile directly attacks the substrate and the leaving group departs simultaneously. The higher concentration of a strong nucleophile increases the likelihood of an SN2 reaction. In summary, weak nucleophiles favor the SN1 mechanism, while strong nucleophiles in high concentration favor the SN2 mechanism for nucleophilic substitution
In a nucleophilic substitution reaction, a two-step mechanism involves first bond breakage to form a carbocation intermediate, followed by bond formation.

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Answer:

Using the formula cards again, add the coefficient of 2 in front of the formula and have them recalculate the number of each element and the total number of atoms in each element.

Explanation:

The number of elements in a compound is counted by identifying and counting the chemical symbols represented in the chemical formula

A compound is a substance that is a mixture of more than one elements.

Compounds are made of two or more elements. These elements are represented by their symbols. These symbols can be identified and the number of elements represented by these symbols are counted.

For example, in the compound \(H_2O\):

H represents Hydrogen

O represents Oxygen

The elements in Water ( \(H_2O\)) are Hydrogen and Oxygen

Therefore, the number of elements in  \(H_2O\) is 2

Also in, \(NaCl\)

The elements are Sodium(Na) and Chlorine(Cl)

There are two elements in NaCl

Hence, the number of elements in a compound is counted by identifying and counting the chemical symbols represented in the chemical formula

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To determine the empirical formula of the lead oxide, we need to find the mole ratios of lead and oxygen in the product.

First, we need to determine the moles of each element present in the product:

Mass of lead = 1.154 g - x (where x is the mass of oxygen in the product)

Mass of oxygen = x

Next, we need to convert the masses of lead and oxygen to moles:

moles of lead = (1.154 g - x) / 207.2 g/mol

moles of oxygen = x / 16.00 g/mol

We can set up a ratio of moles of lead to moles of oxygen:

(1.154 g - x) / 207.2 g/mol : x / 16.00 g/mol

Cross-multiplying and simplifying:

(1.154 g - x) x 16.00 g/mol = 207.2 g/mol x

18.464 g - 16.00 x = 207.2 x

191.736 g = 223.2 x

x = 0.859 g

So, the mass of oxygen in the product is 0.859 g. The mass of lead in the product is 1.154 g - 0.859 g = 0.295 g.

Now we can calculate the moles of each element in the product:

moles of lead = 0.295 g / 207.2 g/mol = 0.001422 mol

moles of oxygen = 0.859 g / 16.00 g/mol = 0.0537 mol

To find the empirical formula, we need to divide the moles of each element by the smallest number of moles:

0.001422 mol / 0.001422 mol = 1

0.0537 mol / 0.001422 mol = 37.7

Rounding to the nearest whole number, we get the empirical formula PbO38.

The mass percentage of KBr in the given solution is 35.55%.

To find the mass percentage of KBr in the solution, we need to first calculate the total mass of the solution. This can be done by adding the masses of KBr and H₂O.

Mass of KBr = 3.44 g (given)

Molar mass of KBr = 119 g/mol

Number of moles of KBr = 0.0289 mol (given)

Mass of H₂O = 6.22 g (given)

Molar mass of H₂O = 18 g/mol

Number of moles of H₂O = 0.345 mol (given)

Total mass of solution = mass of KBr + mass of H₂O

= 3.44 g + 6.22 g

= 9.66 g

Now, we can find the mass of KBr in the solution by multiplying the number of moles of KBr by its molar mass.

Mass of KBr in solution = 0.0289 mol x 119 g/mol

= 3.44 g

Finally, we can calculate the mass percentage of KBr in the solution by dividing the mass of KBr by the total mass of the solution and multiplying by 100.

Mass percentage of KBr = (mass of KBr in solution/total mass of solution) x 100

= (3.44 g/9.66 g) x 100

= 35.55%

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0.63 mol aluminum will produce 0.63 mol of aluminumchloride from 17.0 g of aluminum.

AlCl3 is the chemical formula for aluminum chloride, sometimes referred to as aluminum trichloride. With the chemical formula [Al(H2O)6]Cl3, it produces hexahydrate, which is composed of six hydrated water molecules. Both are colorless crystals, although iron(III) chloride contamination in samples frequently gives them a yellow hue.

We have excess of chlorine gas and 17.0 g of aluminum

so how many moles of of aluminum chloride could be produced from 17. 0 g of aluminum

to find this first find no of moles in 17.0 g al

that is divide 17.0g al from the molar mass of al that is 26.98

so, 17.0/26.98=0.63 mol

now acc . to a law it is said that 2 moles of aluminum will produce 2 mole of aluminum chloride.

Hence, 0.63 mol aluminum will produce 0.63 mol of aluminumchloride from 17.0 g of aluminum.

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Answer:energy is emitted as electromagnetic radiy

Explanation:

Answer:

Mitosis

Explanation:

you scrape your knee and the skin repairs itself

Answer:

The atom that requires the largest number of electrons to complete its octet

Explanation:

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Correct answer is Each orbit has a specific energy level.

Therefore, Correct statement is Each orbit has a specific energy level.

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The complete question is mentioned below:

Which statement about Niels Bohr’s atomic model is true?

a) Higher orbits have lower energies.

b) Each orbit has a specific energy level. c) Electrons can exist in any energy level. d) Orbits close to the nucleus have no energy.

Once a digital recording is made, the bandwidth is set in place. An analog recording is considered unlimited. Therefore, it can move to a higher and higher resolution without losing its original quality.

The two changes that can be classified as physical are as follows:

A physical change in chemistry is a change affecting the form of a chemical substance, but not its chemical composition.

When matter changes its observable properties, we can say it has undergone a physical change.

Physical change is a type of change where the physical properties of matter change. Physical changes include;

Therefore, melting of ice, which is a change of state and shattering of glass are examples of physical change.

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Answer:  La Ferrassie 1

Explanation: La Ferrassie 1, often referred to as LF1, is a male Neanderthal skeleton estimated to be 70–50,000 years old. It was discovered at the La Ferrassie site in France by Louis Capitan and Denis Peyrony in 1909. The skull is the most complete Neanderthal skull ever found.

Answer: the plasma membrane, the cytoplasm, ribosomes, and genetic material.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of gold = 6.39 cm³

density = 19.32 g/cm³

The mass is

mass = 19.32 × 6.39 = 123.4548

We have the final answer as

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