Most mammals have a specialized organ that brings the blood of the fetus into close contact with the blood of the mother; this allows food, water, and oxygen to be delivered from mother to child. What is the name of this organ

In addition to providing the same information just like its molecular formula, a compound's structural formula also reveals the atoms' connections inside the molecule.

The number of atoms from each element in a single chemical molecule is specified by the molecular formula. It displays the precise number of atoms in a molecule. For instance, the chemical structure of propane is C4H10. The provided compound contains 10 hydrogen atoms and 4 carbon atoms according to this formula.

Empirical formulae reveal the simplest or the most reduced ratio of components in a compound while molecular formulas reveal how many atoms from each element are present in a complex. The empirical formula and the molecular formula of a substance are identical if the molecular formula could be decreased further.

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0.0451 moles of KMnO4 and 7.18 grams of KMnO4 are required to produce 11.4 grams of KNO3.

The chemical equation for the reaction is

5 KNO₂ + 2KMnO₄ + 3 H₂SO₄ →5 KNO₃ + K₂SO₄ + MnSO₄ + 3 H₂O

From the equation, we see that for every 5 moles of KMnO2, 5 moles of KNO3 are produced, and for every 2 moles of KMnO4, 5 moles of KNO3 are produced.

Determine the number of moles of KNO3 produced, which can be calculated from the mass of KNO3 (11.4 g) and its molar mass (101.1 g/mol):

11.4 g KNO3 / 101.1 g/mol = 0.1129 moles KNO3

Since 5 moles of KMnO2 produce 5 moles of KNO3, 2 moles of KMnO4 produce 5 moles of KNO3.

This means that for every 0.1129 moles of KNO3, 0.1129 moles / (5/2) = 0.0451 moles of KMnO4 are required.

Convert the number of moles of KMnO4 to mass by multiplying by its molar mass (158.0 g/mol):

0.0451 moles KMnO4 * 158.0 g/mol = 7.18 g KMnO4

How do you convert moles to mass?

Multiply the molecular weight by the number of moles for the substance. The molecular weight is the number of grams per mole for the substance and gives the conversion factor for moles to grams for that particular substance.

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Explanation:

Since [H+] [OH-] =10^(-14)

[H+] = (10^-14) / (1.4×10^-10)

To determine the entropy change of carbon dioxide during the process of paddle-wheel work, we can use the equation ΔS = Cp * ln(T2/T1) - R * ln(P2/P1), where ΔS is the change in entropy, Cp is the specific heat capacity at constant pressure, R is the gas constant, T1 and T2 are the initial and final temperatures, and P1 and P2 are the initial and final pressures.

Since the specific heats are assumed to be constant, we can simplify the equation to ΔS = Cp * ln(P2/P1). We are given that the tank is insulated and rigid, so there is no heat transfer or volume change. Therefore, the temperature remains constant throughout the process.

Using the ideal gas law, we can calculate the initial and final temperatures to be 298 K and 355 K, respectively. We are also given the initial and final pressures as 100 kPa and 150 kPa, respectively.

Using the specific heat capacity of carbon dioxide at constant pressure, which is 0.846 kJ/kg*K, we can calculate the entropy change as follows:

ΔS = 0.846 * ln(150/100)
ΔS = 0.110 kJ/K

Therefore, the entropy of carbon dioxide increases by 0.110 kJ/K during the process of paddle-wheel work in the insulated rigid tank.
To determine the entropy change of carbon dioxide in an insulated rigid tank, we'll need to follow these steps:

1. Identify the initial and final states: Initially, the tank contains 2.7 kg of CO2 at 100 kPa. After paddle-wheel work, the pressure rises to 150 kPa.

2. Determine the change in temperature: Since the process involves work done on the system, it will cause a change in temperature. To find this, use the constant specific heat values for CO2 (Cp and Cv) and the relation, P2/P1 = (T2/T1)^(k-1/k), where k = Cp/Cv.

3. Calculate the initial and final entropies: Use the specific entropy equations, s = Cv*ln(T2/T1) + R*ln(P2/P1) for an ideal gas, where R is the gas constant for CO2. Calculate the initial and final entropies based on the initial and final temperatures and pressures.

4. Determine the entropy change: Subtract the initial entropy from the final entropy to find the change in entropy during the process.

By following these steps, you will find the entropy change of the carbon dioxide in the insulated rigid tank as the pressure increases from 100 kPa to 150 kPa.

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110 grams of baking soda is approximately equal to 1.31 moles.

To determine the number of moles in 110 grams of baking soda (NaHCO3), we need to use the molar mass of NaHCO3, which is calculated by adding the atomic masses of each element in the compound.

The molar mass of sodium (Na) is approximately 22.99 g/mol, the molar mass of hydrogen (H) is approximately 1.01 g/mol, the molar mass of carbon (C) is approximately 12.01 g/mol, and the molar mass of oxygen (O) is approximately 16.00 g/mol.

Now we can calculate the molar mass of NaHCO3:

Na: 1 * 22.99 g/mol = 22.99 g/mol

H: 1 * 1.01 g/mol = 1.01 g/mol

C: 1 * 12.01 g/mol = 12.01 g/mol

O: 3 * 16.00 g/mol = 48.00 g/mol

Adding these values together:

22.99 g/mol + 1.01 g/mol + 12.01 g/mol + 48.00 g/mol = 84.01 g/mol

Therefore, the molar mass of NaHCO3 is 84.01 g/mol.

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

moles = mass / molar mass

Substituting the given mass of 110 grams and the molar mass of 84.01 g/mol into the formula:

moles = 110 g / 84.01 g/mol ≈ 1.31 moles

Hence, 110 grams of baking soda is approximately equal to 1.31 moles.

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Answer:

Explanation:

The nucleus of an atom contains protons and neutrons.

Protons have positive charges, neutrons have neutral charges (no charge), and electrons have negative charges.  That is why when you determine net charge of atom you only look at the proton to electron ratio since the neutrons don't matter when it comes to charge.

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Answer:

Fundamentally, chemistry is the study of matter and change. The way that chemists study matter and change and the types of systems that are studied varies dramatically. Traditionally, chemistry has been broken into five main subdisciplines: Organic, Analytical, Physical, Inorganic and Biochemistry.

Explanation:

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Partial pressure of the gas B is 0.23 atm.

Let us note that if there is a mixture of gases that can be found in a particular vessel then we must know that each of the gases that are there would exert its own pressure on the walls of the container.

Now we know that the total number of moles that is present =

2.5 + 1.2 + 1.0 = 4.7 moles. The total pressure of the gases that we have in the system is about 0.9 atm.

We know that;

Partial pressure = Mole fraction * Total pressure

Partial pressure of B is;

1.2/4.7 * 0.9

= 0.23 atm

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Answer:

Iodine

Explanation:

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Copper = Cuprum

Sulfur = Sulfurium

Tin = Stannum

The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.

Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.

However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.

Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.

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In the electron transport chain, electrons are passed from redox center to redox center (a) with the assistance of a carrier protein. The electron transport chain is a series of protein complexes embedded in the inner mitochondrial membrane (in eukaryotes) or the plasma membrane (in prokaryotes).

These protein complexes contain redox centers, such as iron-sulfur clusters or heme groups, which can accept and donate electrons. The electrons are transferred from one redox center to another through a series of oxidation-reduction reactions. Carrier proteins, such as cytochromes or flavoproteins, facilitate the movement of electrons between the redox centers.

As the electrons are passed along the chain, they move from lower to higher energy states, releasing energy in the process. The movement of electrons is not spontaneous but rather driven by the redox potential gradient created by the transfer of electrons.

This redox potential gradient is established by the movement of protons (H+) across the membrane, which is coupled to electron transport and creates a proton gradient used for ATP synthesis. So, option (a) with the assistance of a carrier protein is the correct answer.

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Answer: d

Explanation: For an example, many scientists use scientific notation when referring to the sun and moon. They use the power of ten to refer to the large numbers of miles away from the earth.

Answer:

3, 2, 4, 1

Explanation:

That's the correct sequence

Answer:

The number of valence electrons is the number of electrons in the outer shell, that the atom uses for bonding. Nitrogen has 5 electrons in its n=2 (outer) shell. There is a quick way of identifying the number of valence electrons - it is the same as the Group number.

Explanation:

To collect 5 ml of serum as specified in the test request, a tube with a minimum size of 6 ml should be used. This will allow for adequate space to accommodate the serum sample without risking contamination or spills during collection.

It is important to use a tube specifically designed for serum collection to ensure specified accured test results.
 To fulfill the test request that specifies collecting 5 ml of serum, you would need to use a serum separator tube (SST), also known as a tiger-top tube. The minimum size for the tube should be at least 5 ml to accommodate the required volume of serum.Draw whole blood in an amount 2 1/2 times the required volume of serum so that a sufficient amount of serum can be obtained. The 5 mL red top tube will yield approximately 2.5 mL serum after clotting and centrifuging.Collect whole blood in a microcentrifuge tube. After collection of the whole blood, allow the blood to clot by leaving it undisturbed at room temperature. This usually takes 15-30 minutes. Remove the clot by centrifuging at 1,000-2,000 x g for 10 minutes in a refrigerated centrifuge.

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Answer:

m= 85.7g

V= 32.4mL

d= m/V

d= 2.65g/mL

Answer:The plant kingdom consists of organisms which posess the ability to generate their own food through a process called photosynthesis. The animalia kingdom is not capable of this process so they are obligated to obtain food from others. Known to date there are about 250,000 known types of plants.

Answer:

Members of Kingdom Animalia are heterotrophic, whereas members of Kingdom Plantae are typically autotrophic.

Explanation:

By weight the hydroxides are 45.9% of the weight

The mass percentage of the OH⁻ in the compound Ca(OH)₂ is 45.94 %.

The percentage of any element or group of atoms in a given compound is the number of parts by mass of that element or group of atoms present in 100 parts by mass of the given compound.

The percentage of an element can be calculated in 2 steps:

First, calculate the molar mass of the compound by the addition of the atomic masses of the atoms. Then, the percentage of the elements by dividing the total mass of the element or or group of atoms by the molar mass of the compound multiplied by 100.

Given, the molecular formula of the given compound is Ca(OH)₂. The atomic mass of calcium, hydrogen, and oxygen is 40g, 1 g, and 16 respectively.

The molecular mass of the  Ca(OH)₂ = 74 g/mol

The mass of OH in  Ca(OH)₂ = 34 g

The mass percentage of the OH⁻ = (34/74) × 100 = 45.94 %

Therefore, the mass percentage of the OH in Ca(OH)₂ is equal to 45.94%.

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Answer:

6 pH is a weak acid

Explanation:

Generally, a strong acid has a pH of about zero to 3.

The pH scale typically ranges from 1 to 14, with lower numbers representing acids, higher numbers, bases. Neutral liquids like water have a pH of 7.

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When choosing a substance for use in a cooling system, we want a substance that can absorb a large amount of heat without undergoing a significant temperature change. This is where the specific heat capacity of a substance comes into play.

The specific heat capacity of a substance is defined as the amount of heat required to raise the temperature of one unit of mass of the substance by one degree Celsius (or Kelvin). A substance with a high specific heat capacity requires more heat to raise its temperature by a certain amount than a substance with a low specific heat capacity. Therefore, a substance with a high specific heat capacity would be best for use in a cooling system.

Out of the options given, a liquid with a high specific heat would be the best choice for use in a cooling system. Liquids have a higher specific heat than gases, which makes them better at absorbing and storing heat. Additionally, liquids have a higher thermal conductivity than solids, which means they can more efficiently transfer heat from one location to another.

Moreover, among the liquids, water is a commonly used coolant due to its high specific heat capacity, which means it can absorb a large amount of heat without undergoing a significant temperature change. Additionally, water has a high boiling point, which makes it effective at absorbing heat from high-temperature sources without boiling and evaporating.

In summary, a liquid with a high specific heat, such as water, would be the best choice for use in a cooling system due to its ability to absorb and store heat efficiently.

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The factor which will not determines if two molecules will bind according to collision theory is the direction the molecules are facing

Collision theory is a theory which describes of predicting the rate at which chemical reactions occurs between atoms and molecules of elements.

So therefore, the factor which will not determines if two molecules will bind according to collision theory is the direction the molecules are facing

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Answer:

the answer is Energy will be exchanged, but matter will not be exchanged.

this because that in a closed system energy is able to be transfered but matter cant.

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Answer:

b

Explanation:

none

Answer: The answer is the one with the letter P in the red circle.

Explanation:

Answer:

this

Explanation:

because

Answer:

Metalloid -

A metalloid is a chemical element with properties intermediate between those of typical metals and nonmetals

Alloy -

An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are defined by a metallic bonding character.

Answer:

Metalloid: It is actually any chemical element which have the properties just like the mixture properties of metal and non metal. Or Which contain those properties in between the non metal and metal.Mostly the metalloids have the appearance just like the metallic appearance  And also they are the brittle one's .  Boron and silicon are the example.

Alloy: They are usually the mixture of metals. Some times mixture of metal may contain another element .They are recognized by their metallic bonding characteristics.

Explanation: By combining with other metals metalloid can form the alloy.