What is the significance of enzymes in maintaining homeostasis in living organisms ?

Answer 1. mixture C is a heterogeneous solution.

This is because heterogeneous solution :

Answer 2. mixture B is a solution.

Solutions are homogeneous solution and homogeneous solution:

Answer:

Amount of mercury is 1.0*10⁻⁵ g

Explanation:

Given:

Mercury content of stream = 0.68 ppb

volume of water = 15.0 L

Density of water = 0.998 g/L

To determine:

Amount of mercury in 15.0 L of water

Calculation:

[tex]1 ppb = \frac{1\mu g(solute)}{1L(solvent)}[/tex]

where 1 μg (micro gram) = 10⁻⁶ g

0.68 ppm implies that there is 0.68 *10⁻⁶ g mercury per Liter of water

Therefore, the amount of mercury in 15.0 L water would be:

[tex]=\frac{0.68*10^{-6}g\ Hg* 15.0\ L\ water}{1\ L\ water} =1.02*10^{-5}g[/tex]

Twelve protons and ten electrons make up a magnesium ion. Mg contains 12 protons, since it has an atomic number of 12. Next, we'll examine the charge, which is 2+.

The short answer is that it has an almost empty “outer shell.” From the nucleus, the outer electrons are far away. The inner electrons partially “shield” them from the nucleus's attraction.

Magnesium, It, is a good electrical conductor. The element magnesium is electropositive. Magnesium has a low enthalpy of ionization. Magnesium oxide is a simple basic oxide because it contains oxide ions.

When it mixes with water, it creates a basic called magnesium hydroxide.

Magnesium produces hydrogen gas and magnesium hydroxide when it combines with heated water or water vapor.

Therefore, Magnesium contains 12 protons and 10 electrons after loosing 2 electrons.

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The answer is False to this statement .

In a neutral atom, the number of protons is equal to the number of electrons.

It has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.

Therefore from the above definition it can be understood that the statement that "in a neutral atom the number of protons is equal to the number of neutrons" is false

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In a neutral atom, the number of protons is equal to the number of electrons.

In a neutral atom, the number of protons is equal to the number of electrons, not the number of neutrons. An atom is considered neutral when it has an equal number of protons and electrons, resulting in a net charge of zero. The number of protons determines the atomic number of an element and is unique to each element.

Answer:

The mass and atomic number

Explanation:

There are two numbers that are written in front of the symbol. The mass number (written above) and the atomic number (written below). In mass number is equal to the sum of protons and neutrons, the atomic number is equal to the number of protons in the nucleus. The unstable nuclei are due to excess of protons or neutrons. Radioactive atoms tend to emit them intermittently and randomly.

answer is D.........

The average bond order for a P-O bond in a phosphate ion can be calculated by the formula (bonding electrons - anti-bonding electrons) / 2, considering the 4 P-O bonds, the average bond order is approximately 1.5.

The average bond order of a P-O bond in a phosphate ion (PO43-) can be calculated using the formula and concept of bond order. Bond order is defined as the number of pairs of electrons between two atoms. In the case of a phosphate ion, there are 4 P-O bonds.

Each P-O bond involves a Pi bond and a Sigma bond. As such, to calculate the average bond order, we would first count all the bonding and anti-bonding electrons. Then, we subtract the number of anti-bonding electrons from the number of bonding electrons, divide by 2 to get the total bond order, and then divide by 4 (for the 4 P-O bonds) to get the average bond order.

However, as the electron configuration of phosphate is a bit complex, it is generally accepted that the average bond order of a P-O bond in a phosphate ion is around 1.5 considering resonance structures in which the phosphorus atom forms double bonds with different oxygen atoms

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The name for the set of rules based on mathematical proportions controlling artistic creation is called 'the canon'. It provides a standard of beauty for artists and has been influential from ancient times to the Renaissance and beyond.

The set of rules, based on precise mathematical proportions, imposing strict controls on the artistic process and the appearance of the images created, is known as the canon. This concept has roots in ancient histories and practices, such as those of the Pythagoreans, ancient Egyptians, and was notably explored during the Renaissance by Leonardo da Vinci with the Vitruvian Man. A canon operates as a standard of beauty, guiding artists in achieving a harmonious balance and proportion in their work, whether it's in paintings, sculptures, or architecture. While artists like Zuccaro and Danti debated the application of mathematical proportions and an absolute canon, they recognized the importance of understanding these principles. Thus, even those who were naturally gifted in the arts could enhance their work through knowledge of the canon, and those not born to it could learn and apply these principles to achieve artistic standards.

Answer:

Q = 30.90 kJ, W = 12.36 kJ, ΔE = 18.54 kJ.

Explanation:

The expansion is happening at constant pressure without a phase change, thus, the heat can be calculated by:

Q = n*c*ΔT

Where n is the number of moles, c is the molar heat capacity, and ΔT is the temperature variation (final - initial), thus:

Q = 39.1*20.8*(38.0 - 0.0)

Q = 30904.64 J

Q = 30.90 kJ

The work done by a expansion at constant pressure is:

W = P*ΔV

Where P is the pressure (1 atm = 101325 Pa), and ΔV the volume variation (final - initial). Vfinal = 998 L = 0.998m³, Vinitial = 876 L = 0.876 m³.

W = 101325*(0.998 - 0.876)

W = 12361.65 J

W = 12.36 kJ

By the first law of the thermodynamics, the variation of the internal energy ΔE is:

ΔE = Q - W

ΔE = 30.90 - 12.36

ΔE = 18.54 kJ

There are four major components found in wood, and these are:

cellulose

lignin

starch

protein

Among the four, I believe that cellulose and lignin are the most difficult to degrade because they contain large amount of cross-linked heavy hydrocarbons.

Answer:

cellulose

lignin

Organic compounds typically contain carbon and hydrogen, forming diverse structures and are prevalent in living organisms, while inorganic compounds may not contain carbon and are often salts, metals, and other elements. There are exceptions to the classification, but this distinction is based on the vast majority of known compounds.

Inorganic and organic compounds differ mainly in their composition and structure. Organic compounds contain carbon atoms and, typically, hydrogen atoms, forming the backbone of the compound. These compounds participate in diverse chemical reactions and are found in all living organisms. Examples of organic compounds include hexane (C6H14) and other carbon-based molecules.

Inorganic compounds, on the other hand, often lack carbon and hydrogen as a part of their primary structure. They include metals, salts, and other elements. A common example is sodium chloride (NaCl), also known as table salt, which is classified as inorganic.

It is important to note that while organic chemistry focuses on carbon compounds, inorganic chemistry is dedicated to the study of all other elements, which is reasonable given the vast majority of characterized compounds are carbon-based. Despite the basic classification, there are exceptions, such as carbon oxides and carbonates, which are considered inorganic despite containing carbon because they do not contain hydrogen.

We determine the moles of LiF in the given solution by first converting the volume from mL to L and then using the molarity formula. This gives us the moles of LiF in the 258.6 mL solution.

The question is asking us to calculate the moles of LiF (Lithium fluoride) present in a specific volume of 0.0296 M solution. To do this, we can use the molarity equation, where molarity is defined as moles of solute per liter of solution.

Before applying the equation, we need to convert the volume of the solution from milliliters (mL) to liters (L). We know 1 L = 1000 mL, therefore 258.6 mL = 258.6/1000 L = 0.2586 L.

After conversion, we plug the values into the molarity equation which is Moles = Molarity x Volume, giving us Moles = 0.0296 M x 0.2586 L. When this product is calculated, we get the moles of LiF present in the 258.6 mL solution.

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The strength of the bond holding atoms together determines the hardness of a mineral. Water glass has stronger bonds.

An enduring attraction between atoms or ions known as a chemical bond is what allows molecules and crystals to form. The bond may be created by the sharing of electrons in covalent bonds or by the electrostatic attraction of two oppositely charged ions, as in ionic bonds.

Covalent bonds are more powerful than ionic connections because of the close sharing of pairs of electrons (one electron from each of two atoms).

The strongest bindings found in nature are covalent bonds, which require the assistance of enzymes to be broken under normal biological circumstances. This is because the linked atoms share electrons equally, and when something is equally shared, there is never a conflict that could undermine the arrangement.

Thus, Water glass has stronger bonds.

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true

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Ionic compounds are those compounds which form an ion or dissociates into ions when placed in a solution. These compounds are made up of a metal and non metal. From the choices, here are the ionic compounds:

na2so4

h2so4

cacl2

ca3(po4)2

Final answer:

To convert 709 mm Hg to cm H₂O, first convert mm Hg to cm Hg and then multiply by 13.6 to account for the difference in density, resulting in a barometric pressure of 964.24 cm H₂O.

Explanation:

To convert the pressure reading from a mercury barometer (mm Hg) to a water barometer reading (cm H₂O), we need to use the ratio of densities of mercury and water. Given that the density of mercury is approximately 13.6 times greater than the density of water, we can calculate the height of the water column that would exert the same pressure as the mercury column.

First, we convert the given pressure in mm Hg to cm Hg since the resulting pressure in water is to be found in cm H₂O. We know that 1 cm Hg = 10 mm Hg, so we have:

709 mm Hg * (1 cm Hg / 10 mm Hg) = 70.9 cm Hg

Now, to convert to cm H₂O, since the density of mercury is 13.6 times that of water, a column of water will need to be 13.6 times higher than a mercury column to exert the same pressure. Therefore:

Barometric pressure = 70.9 cm Hg * 13.6 = 964.24 cm H₂O

The barometric pressure in cm H₂O is 964.24 cm.