calculate the mass percentage of ascorbic acid in this solution. express the mass percentage to three significant digits.

Answer:

Explanation:

When the same student walks home after school, the outside temperature has dropped to 35 degrees. In this situation, how is thermal homeostasis maintained? answer choices The student's heart rate drops as a negative feedback mechanism to deliver less oxygen to the lungs

Answer:

The student's heart rate drops as a negative feedback mechanism to deliver less oxygen to the lungs

Explanation:

The temperature has declined by 25 degrees Farenheit from 60 to 35.

Answer:

Yes!

Explanation:

Liquids & gases are poor conductors, but they can make heat (thermal energy) travel quickly from one point to another. ... ~ When waves of heat (thermal energy) travel through empty space and transparent mediums, heat transfer by radiation occurs. Solids, liquids, & gases can all be heated by radiation.

The molecule which would have the highest boiling point is 2-methylhexane. Thus, the correct option will be D.

The boiling point is the temperature at which the vapor pressure of a liquid is equal to the external pressure. The boiling point of a liquid is a measure of its vapor pressure. The higher the boiling point, the higher the vapor pressure of the liquid, and the more heat is required to vaporize it.

The boiling point of a substance is affected by the strength and types of intermolecular forces. The stronger the intermolecular forces, the higher the boiling point. 2-methylhexane has highest boiling point because it has the highest number of carbons and branches, which contribute to its strong intermolecular forces that lead to a higher boiling point.

Therefore, the correct option is D.

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D. The limb bones do not look as developed as

they do in the amphibian.

Answer:

it has fins like a fish

Explanation:

because it has a fin bone

Answer:

A. Anticline

Explanation:

Answer:A

Explanation:

When you peel sweet potatoes, they can turn brown quickly due to the exposure to air. To prevent this from happening, you can soak the peeled sweet potatoes in cold water until you are ready to use them.

Adding a small amount of lemon juice or vinegar to the water can also help slow down the browning process. Another option is to store the peeled sweet potatoes in an airtight container with a damp paper towel to keep them moist. It is also important to use the peeled sweet potatoes as soon as possible, as they will eventually start to turn brown even with these preventative measures. By taking these steps, you can keep your peeled sweet potatoes looking fresh and appetizing for longer.

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The symbol Kb(HS-) represents the equilibrium constant for the reaction HS− + H2O ⇌ H3O+ + S2-.

The ionization of HS- in water can be represented by the chemical equation, HS− + H2O ⇌ H3O+ + S2-It is an equilibrium process. Therefore, there will be an equilibrium constant, Kb for it. We can write the equilibrium expression as follows, Kb = [H3O+][S2-]/[HS-]Where [H3O+], [S2-], and [HS-] represent the equilibrium concentrations of H3O+, S2- and HS- respectively.

The symbol Kb(HS-) represents the equilibrium constant for this reaction. Therefore, the answer is C) HS- + H2O (arrow) H3O+ + S2-.

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A biochemical compound consisting of an amine group, a carboxyl group, and a side-chain substituent group is called an amino acid.

These organic molecules are the building blocks of proteins and play important roles in the body such as enzyme catalysis, cell signaling, and energy production.

The side-chain substituent group gives each amino acid its unique chemical and physical properties, determining its function and role in protein structure.

There are 20 standard amino acids found in proteins, each with its own specific characteristics. The sequencing of these amino acids determines the primary structure of a protein, which ultimately influences its overall structure and function.

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A biochemical compound consisting of an amine group, a carboxyl group, and a side-chain substituent group is called  amino acid.

Amino acids are the building blocks of proteins and are essential for many biological processes. They play crucial roles in the structure, function, and regulation of cells and tissues. Amino acids have a basic structure that includes an amine group (-NH2), a carboxyl group (-COOH), and a side-chain substituent group.

The side chain can vary, giving different amino acids unique properties. There are 20 common amino acids found in proteins, each with its own distinct chemical characteristics and functions. They can be classified as essential or non-essential, depending on whether the body can produce them or they need to be obtained from the diet. Overall, amino acids are fundamental to the existence and functioning of living organisms.

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Answer:

a) 3rd Law of Motion

Explanation:

When two plates collide (or) interact with each other it is known as 3rd Law of Motion. Hence, option (a) is correct.

Answer:

Monetary policy

Explanation:

Monetary policy refers to the actions of the central bank of a country that affect interest rate and, subsequently, inflation, among other things.

Fiscal policy relates to government borrowing and sending, as well as taxation.

Therefore, there are 0.50 moles of KOH present in 250 mL of a 2.0 M solution of KOH.

How many moles of KOH are present in 250 mL of a 2.0 M solution of KOH?

To find the number of moles, we can use the formula:

Moles = Molarity x Volume

Given:
Molarity (M) = 2.0 M
Volume (V) = 250 mL

First, we need to convert the volume from milliliters to liters by dividing it by 1000:
Volume (V) = 250 mL ÷ 1000 = 0.25 L

Now we can substitute the values into the formula:

Moles = 2.0 M x 0.25 L
Moles = 0.50 moles

Therefore, there are 0.50 moles of KOH present in 250 mL of a 2.0 M solution of KOH.

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The major purpose of distillation in organic chemistry is to separate and purify liquids based on their different boiling points. A secondary purpose is to collect fractions of liquids with different boiling points, which can then be studied separately.

The major purpose of doing distillation in organic chemistry is to separate a mixture into its individual components based on their different boiling points. By heating the mixture and collecting the vapor at different temperatures, each component can be isolated and collected.
A secondary purpose of distillation is to purify a substance by removing impurities. This can be achieved by boiling the substance at a temperature below the boiling point of the impurities, causing the desired substance to vaporize and be collected while the impurities remain in the liquid phase.

Overall, distillation is a valuable technique in organic chemistry for both separation and purification purposes.

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The mole fraction of NH3 in the solution prepared by dissolving 15.0 g of nh3 in 250.0 g of water is 0.0597.

To find the mole fraction of NH3 in the solution, we need to first calculate the moles of NH3 and water in the solution.

The moles of NH3 can be found by dividing the mass of NH3 by its molar mass:
moles of NH3 = 15.0 g / 17.03 g/mol = 0.881 mol

The moles of water can be found by dividing the mass of water by its molar mass:
moles of water = 250.0 g / 18.02 g/mol = 13.874 mol

The total moles of solute and solvent in the solution are:
total moles = moles of NH3 + moles of water = 0.881 mol + 13.874 mol = 14.755 mol

The mole fraction of NH3 can now be calculated as the ratio of moles of NH3 to total moles:
mole fraction of NH3 = moles of NH3 / total moles = 0.881 mol / 14.755 mol = 0.0597

Therefore, the mole fraction of NH3 in the solution is 0.0597.

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Answer:

B. frozen or mummified fossils

This is the correct answer :)

Answer:

B the answer

Explanation:

frozen or mummified fossils

1) The reaction of a primary amide with LiAlH₄ would result in the reduction of the amide functional group to a primary amine.

2) The reaction of a primary amide with H₃O⁺ would result in the hydrolysis of the amide functional group to form a carboxylic acid and ammonia.

1) LiAlH₄ is a strong reducing agent commonly used for the reduction of carbonyl compounds. In the presence of LiAlH₄, the primary amide undergoes reduction, where the carbonyl group (-C=O) is transformed into a primary amine (-NH₂), resulting in the removal of the oxygen atom.

2) H₃O⁺ represents an acidic environment and can initiate the hydrolysis of amides. In the presence of H₃O⁺, the amide functional group undergoes hydrolysis through a reaction called acid hydrolysis. This process cleaves the amide bond, breaking it into a carboxylic acid and an amine. The amine formed in this case would be ammonia (NH₃).

Overall, the reaction of a primary amide with LiAlH₄ results in the reduction to a primary amine, while the reaction with H₃O⁺ leads to the hydrolysis of the amide, forming a carboxylic acid and ammonia.

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Answer:

A parasite.

Explanation:

A virus usually invades cells and replicates.

A bacteria usually just replicates and either is beneficial or can harm.

A fungus usually decomposes or can make you sick.

A parasite usually is parasitism - it invades the organisms and leeches off them for shelter and nutrients and can harm.

Answer:

A parasite.

Explanation:

i got it right

Answer:

When carbon is heated in air, it reacts with oxygen to form carbon dioxide. As the carbon reacts with oxygen to form carbon dioxide, the mass of the carbon decreases while the mass of the oxygen and carbon dioxide increases.

Answer:

When carbon is heated in air, it undergoes a process known as combustion or burning. During this process, carbon reacts with oxygen present in the air, resulting in the production of carbon dioxide gas. This reaction causes the carbon atoms to be lost in the form of carbon dioxide molecules. Hence, the original mass of carbon decreases due to the formation of lighter carbon dioxide molecules that are released into the atmosphere. Overall, the burning of carbon in air results in a reduction in its mass.

Neo-pentane represents the Compound A while compound B is n-pentane.

After careful consideration we can say that compounds A and B are alkanes and also isomers of pentane. In chemistry, Isomers are defined as compounds having same empirical molecular formula but different structural formulas due to varying arrangement of atoms.

Now, as per the question statement, compound A gives a single monochlorination product upon heating with the molecule of chlorine i.e. Cl2 showing that the molecule is extremely symmetric. This molecule must be neo-pentane. Refer to image 1.

Similarly, Compound B forms 3 constitutional isomers after undergoing monochlorination. This compound must be n-pentane since three are 3 different types of carbon atoms in the structure. Refer to image 2.

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Neopentane makes up component A, while n-pentane makes up compound B.

First and foremost, it is important to understand that compounds A and B are isomers and alkanes of pentane. Compounds with distinct structural formulas but the same molecular formula are known as isomers.

When heated with Cl2, compound A now produces a single monochlorination product, demonstrating the molecule's high degree of symmetry. Neopentane must be this chemical (image 1).

Upon monochlorination, compound B divides into three constitutional isomers.

A halogen atom is replaced with another substance in a process known as halogenation, where the halogen atom eventually becomes a component of the new substance or compound. In general, one or more halogens are typically added to the chemical during the halogenation reaction.

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Answer:

combination fire attack

Answer:

facta you from the same thing as you from the samel

Answer:

The first one

The process of dissolving frees the electrons in the solution to move.

Explanation:

40.1g of nitrogen gas is produced.

The equation given is

2 NH₃ + 3 CuO →3 Cu + N₂ + 3 H₂O

This equation is already balanced.

When 3 moles of CuO are consumed, 1 mole of nitrogen gas is produced.

We get 1 mole of nitrogen from 3 moles of copper oxide.

We need to find the number of moles of nitrogen gas produced when 4.3 moles of copper oxide are consumed.

4.3/3 x 1 = 1.433 mols

40.1g of nitrogen gas can be made when 4.3 moles of CuO are consumed.

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Answer:

Explanation:

1 mole of iron is 56 grams (rounded)

x mole of iron is 38 grams (given

1/x = 56/38                Cross multiply

56x = 38*1                Divide by 56

x = 38/56

x = 0.679 mols of iron

1 mol of anything = 6.02 * 10^23

0.678 mols of iron = x

1/0.679 = 6.02 *10^23 /x

x = 0.679 * 6.02*10^23

x = 4.09 * 10 ^23

So there are 4.09 * 10^23 atoms of Fe in 38 grams of iron

Answer:

31 mol N₂

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

25 mol HCl

Step 2: Identify Conversions

RxN:   4 mol HCl = 5 mol N₂

Step 3: Stoichiometry

\(25 \ mol \ HCl(\frac{5 \ mol \ N_2}{4 \ mol \ HCl} )\) = 31.25 mol N₂

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

31.25 mol N₂ ≈ 31 mol N₂

Answer:

Explanation:

The number of molecules can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 1.5 × 6.02 × 10²³

We have the final answer as

Hope this helps you

To get a dose of 0.1 gm (100 mg), 1.5 ml of sodium amytal solution must be injected intramuscularly (IM).

We can use the available concentration and the desired dose.

Given

First, we need to convert the desired dose from grams to milligrams:

0.1 g = 100 mg

Now, we can set up a proportion to find the volume of solution needed:

(100 mg) / (200 mg) = (x ml) / (3 ml)

Cross-multiplying and solving for x:

100 mg * 3 ml = 200 mg * x ml

300 mlmg = 200 mlmg

x ml = (300 ml*mg) / (200 ml)

x ml = 1.5 ml

So, To get a dose of 0.1 gm (100 mg), 1.5 ml of sodium amytal solution must be injected intramuscularly (IM).

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Answer:

Mass of O = 8.2 gram

Explanation:

Given:

Mass of Fe = 10 g

Total volume = 18.2 g

Find:

Mass of O

Computation:

Using Conservation of total mass

Total volume = Mass of O + Mass of Fe

18.2 = Mass of O + 10

Mass of O = 8.2 gram

Answer:

d

Explanation:

Answer:

D

Explanation:

IM JUST THAT DUDE

A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance.

These diagrams indicate the physical states that exist under specific conditions of pressure and temperature, and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points).

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