True or false? the iron recommendation for girls exceeds that of boys during adolescence.

Option A. Hydrogen Ions

The dissolution of carbon dioxide in the oceans produce hydrogen ions as when carbon dioxide is dissolved in the ocean it leads to Ocean Acidification. This Acidification produces the hydronium ions as more acidic nature implies higher concentrations of hydrogen ions.

Carbon dioxide is a gas that readily dissolves in water to give Carbonic Acid , bicarbonate ions and carbonate ions , all of which are acidic in nature. This lowers the pH of the ocean making the waters more acidic. Therefore the acidity of oceans is largely dependent on carbon compounds and the amount of Carbon dioxide.

The reaction of Carbon dioxide with water to give carbonic acid :

                                CO2 + H2O → H2CO3

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The statement that correctly identifies the type of mixture is that homogeneous mixtures have parts that are distributed evenly. The correct option is c.

A homogeneous mixture is sole in which the composition is consistent throughout the solution.

Since the dissolved salt is evenly distributed throughout the salt water sample, the salt water described as an illustration is homogeneous.

The statement that accurately defines the type of mixture is that homogeneous mixtures have evenly distributed parts.

Thus, the correct option is c.

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Answer:

A strong base, such as NaOH. The amount of OH added shouldn't exceed 0.35 mols (though i would stop at 0.30 mols)

Explanation:

a weakly basic salt can be turned into a buffer by the addition of a strong base, and a weakly acidic salt can be turned into a buffer with a strong acid

Even though h-bonding occurs in ammonia and ethanol, they cannot be used to replace water in living cells because compared to amonia and ethanol, water is more polar.

Compared to amonia and ethanol, water is more polar and may form H bonds. Additionally, water is a better solvent or can dissolve a wide variety of solvents that are employed by living cells.

Hydrogen bonds can be formed by ammonia. When hydrogen bonds between water molecules are disrupted, comparable links between water and ammonia molecules can take their place. Ammonium and hydroxide ions are created when some of the ammonia combines with the water.

A hydrogen bond can develop between a water molecule and an ethanol molecule if there is just one pair of electrons in the water molecule, which will link with the oxygen atom and the polar hydrogen atom to create the bond.

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In this compound, the proportion of carbon atoms to oxygen atoms is 12: 11.

What distinguishes an atom of carbon as such?

The nucleus of a carbon atom is made up of six protons and six neutrons, and it is encased in six electrons. According to quantum physics, the first two electrons must occupy the innermost atomic orbital, while the wavefunctions of the following four electrons only partially fill the second standard and three second principal orbitals.

How are atoms located in a compound?

Calculate the element's molar mass using the periodic table. To determine the atoms, the number of moles, divide the given mass in grams by the molar mass. To get the number of atoms, multiply the number of moles by Avogadro's number.

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Most body water intake is from drinking, whereas most body water lost is via ; urine.

Where is most of the water of the body found ?

Most body water is found within the extracellular fluid. the 2 major forces that result in the movement of water are fluid pressure and osmotic pressure. In ECF , the main cation is potassium, and therefore the major anions are chloride and bicarbonate.

How does water get distributed within the body?

The water we drink is absorbed by the intestines, and circulated throughout the body within the form of body fluids such as blood. These perform various functions that keep us alive. They deliver oxygen and nutrients to the cells, and remove waste materials, which are then eliminated with urination.

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Number of moles of sodium sulfate is 0.633 mol.

Given,

volume of solution= 45mL

molarity of soultion = 2.00 mol/L

we have to find number of moles of sodium sulfate.

Molar mass of sodium sulfate = 142

Number of moles of Na2SO4 = (Molarity of Na2SO4 × volume of the solution) / molecular mass of Na2SO4.

No. of moles of H2SO4 = (2 × 45) / 142 = 0.633 mol

Therefore, number of moles of sodium sulfate in solution is 0.633

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Answer:

I think it's false

Explanation:

The order with respect to CO2 is 1 i.e it is first order with respect to CO2.

The rate of any chemical reaction can be determined by chemical kinetics, which is a branch of chemistry dealing with the study of reaction rates and their mechanisms.

According to chemical kinetics, the rate of a reaction depends upon its reactants which is given by the rate law expression,

Let us take a hypothetical example to understand the rate law expression

aA+ bB ⇒ cC

In the above reaction, we can write the rate law expression as,

Rate =k [A]^x[B]^y, where x and y are the orders of the reactants, a and b respectively and k is a constant.

Similarly, in the expression Rate = k [co2][n2]^n, the order of CO2 is 1 and the order of N2 is n.

Hence, the order with respect to CO2 is 1 i.e it is the first order with respect to CO2.

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Answer:

A liquid has a defined volume, but can change its shape. Water is an example of a liquid. A gas lacks either a defined shape or volume. Water vapor and air are examples of gas.

...

Examples of Solids

Brick.Coin.Iron bar.Banana.Rock.Sand.Glass (no, it does not flow)Aluminum foil.

The mass of fuel the airplane taken on is 1.81 × 10⁵ g or 1.81 × 10² kg.

V(fuel) = 221 l

V(fuel) = 221 l × 1000 ml/l

V(fuel) = 221 000 ml = 2.21 × 10⁵ ml; volume of the fuel

d(fuel) = 0.821 g/ml; density of the fuel

m(fuel) = V(fuel) × V(fuel)

m(fuel) = 2.21 × 10⁵ ml × 0.821 g/ml

m(fuel) = 1.81 × 10⁵ g; mass of the fuel

m(fuel) = 1.81 × 10⁵ g × 10⁻³ kg/g

m(fuel) = 1.81 × 10² kg

Density is a measure of mass per unit of volume (in this example grams per milliliter).

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Answer: Gas has loosely packed atoms, liquids have mediumly packed atoms, and solids have tightly packed atoms.

Explanation: Solids have tightly packed atoms which is what keeps them in their defined shape. They have a defined volume and a defined shape.

Liquids have mediumly packed atoms because liquids don't have a definite shape and take the shape of the container they are placed in. It has a definite volume, but an indefinite shape.

Gases have loosely packed atoms because gases can float around anywhere. They don't have a definite volume, and they don't have a definite shape.

A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions. the new ph value is 5.

The pH of a solution is determined by the concentration of hydrogen ions in that solution. The pH value is the logarithmic value of the inverse of hydrogen ion activity. Because the concentration of hydrogen ions is frequently very low, ion activity is considered to be equal to the concentration of hydrogen ions.

The logarithmic value of the inverse of hydrogen ion activity is the pH value. Because the concentration of hydrogen ions is frequently very low, ion activity is assumed to be equal to the concentration of hydrogen ions. The pH is then the logarithm of the inverse of the concentration of hydrogen ions.

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Glutamine is the nitrogen source of the carbamoyl phosphate in pyrimidine synthesis.

Carbamoyl Phosphate generates when enzyme bound carbamate reacts with second ATP, with release of free enzyme, and ADP.

The atoms of pyrimidine ring comes from the aspartic acid and carbamoyl phosphate (CP). The first step of the pathway is the formation of former or latter molecule. The enzyme named carbamoyl phosphate synthetase II catalyses the latter molecule. Glutamine is used by this enzyme as the nitrogen source.  

N-acetylglutamate activates this mitochondrial enzyme carbomoyl phosphate synthetase but it is not an allosteric activator. It is located in the cytoplasm.

CPS II catalyzes the synthesis of carbamoyl phosphate which is ATP dependent synthesis from glutamine or ammonia.

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If the energy of the photon of light emitted from a hydrogen atom has a magnitude of 4.084 x 10-19 j, and the electron starts at level n = 4 then  final state of the electron is n=2

Here given data is energy of the photon of light emitted from a hydrogen atom has a magnitude of 4.084 x 10-19 j and electron starts at level n = 4 then from ground state to excited state n=2 final state are seen from given data  energy of the photon = E= -2.18×10⁻¹⁸J (1/nf²-1/ni²) using this formula ans is to be 0.235 and this energy is n=2 are seen thats why final state of electron are seen in n=2

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The right answer is given in the picture.

To find the formula of an ionic compound, first, identify the cation and write down its symbol and charge. Then identify the anion and note its sign and charge. Finally, the two ions combine to form an electrically neutral compound.

Particle diagram Elements and compounds can be represented using particle diagrams. This is a box with colored spheres drawn to represent atoms or molecules. These diagrams can represent elements and compounds and their molecular composition by the types of spheres and how they are connected. Particle diagrams are used to show particles, atoms, or molecules within matter. A diagram showing particles in a substance.

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Answer:

Explanation:

To determine the mass of each compound, we need to convert them into units of moles first. We use avogadros number to do this and use the molar mass of the compounds to convert to mass.

3.01 × 1023 molecules H2O ( 1 mole / 6.022x10^23 kg) (18.02 g / 1 mole) = 9.01 g

8.32 × 1020 formula units CaBr2 ( 1 mole / 6.022x10^23 kg) (199.89 g / 1 mole) = 0.28 g

1.93 × 1026 molecules XeF6 ( 1 mole / 6.022x10^23 kg) (245.28 g / 1 mole) = 78610.16 g

MCQs as follows-

chlorophyll is the light-absorbing green coloured pigment that begins the process of photosynthesis, and Chloroplast is a membrane-bound organelle in green plant and algal cells that carries out photosynthesis and generates ATP for the use of plants.

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According to Rutherford's nuclear theory, the number of negatively charged particles outside the nucleus is equal to the number of positively charged protons inside it.

What is Rutherford's nuclear theory?

According to the Rutherford atomic theory, an atom is made up of a compact, dense, positively charged nucleus that is around by smaller, negatively charged particles called electrons. It explains the atomic model, according to which an atom's mass is concentrated in its nucleus, around which the electrons, or negatively charged particles, move.

In accordance with Rutherford's nuclear theory, an oxygen atom has 8 protons and 8 electrons, whereas a calcium atom cannot have 20 protons and 20 electrons. This is because the number of negatively charged particles outside the nucleus is equal to the number of positively charged particles inside the nucleus.

Thus, the number of negatively charged electrons outside the nucleus is equal to the number of positively charged protons inside the same.

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Rocks are wedged apart by plant roots that grow through fissures in quest of water and minerals. Additionally, some fungus, lichens, and plants create acids and other substances that help the chemical weathering of earth minerals. Root systems restrain by adhering to and stabilizing rocks and soils.

How do plants promote mechanical and chemical weathering?

Chemical and mechanical weathering can be brought on by plants. Plants' roots penetrate rocks and cause them to fracture as a result of mechanical weathering. It may also occur on sidewalks or in streets. Plants produce chemical weathering by releasing acids or other chemicals through their roots onto rocks, causing the rocks to fracture and develop fissures.Chemical weathering is also brought on by animals and plants. Plant roots draw components from the minerals as they absorb nutrition. The rock undergoes a chemical alteration as a result.

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When the carboxyl group of fatty acids reacts in a dehydration synthesis reaction with the hydroxide group of glycerol, fats, or oils are formed.

Fats and oils are made up of fatty acids and glycerol.

A fatty acid has a carboxyl group attached to a long chain of carbon atoms.

Based on the presence or absence of double bonds, fatty acids are of two types, saturated (without double bond) or unsaturated (with one or more C=C double bonds), as shown in the adjoining diagram.

Glycerol is chemically trihydroxy propane. It has three hydroxyl groups.

When the carboxylic group of fatty reacts in a dehydration synthesis reaction with the hydroxyl group of glycerol, fats or oils are formed. When these groups react, an ester bond is formed.

This reaction is illustrated in the adjoining diagram.

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In the original sample of substance X, there are 12 molecules and each molecule is made of 2 small red spheres and one blue sphere in the middle.

Change 1 has the same total number of red and blue spheres as the original sample, but the structure of molecules has changed. As a result, this is a chemical change.

In Change 2, the structure of molecules is changed. Some molecules contain solely red spheres, whereas others include both red and blue spheres. Furthermore, the total number of molecules is greater than the number of molecules in the original sample. This violates the principle of conservation of mass.  Hence, this is an impossible change since extra matter was created in this change.

In Change 3,  the number of the molecules and the structure of the molecules is same as the orignial sample. Hence, it is a physical change.

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1.08 x 10²¹ molecules of methionine are present for every 1.0 mole of glycine in the sample.

Given data -

Glycine in the sample = 1.0 mole

Avogadro's number = 1.8 x 10⁻³ moles (we know)

To find the number of molecules of methionine , multiply the molar ratio by the Avogadro's number.

Number of molecules = Avogadro's number x molar ratio

                                     = (1.8 x 10⁻³ moles) x (6.02 x 10²³ molecules/mole)

                                     = 1.08 x 10²¹

Methionine is an essential amino acids for human. For the growth of new blood vessels and for he supplementation, it is an important  amino acid. Too much methionine reslts in the damage to the brain and might be fatal.

Glycine is also an amino acid which has only one single hydrogen as its side chain. It is used in the treatment of some rare metabolic disorders and schizoprenia, stroke, etc.

Glycine is responsible to reduce the levels of methionine in the blood. Glycine is considered a precursor for many necessary metabolites such as purines, glutathione, creatinine and porphyrins. It acts as a neurotransmitter in CNS.

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A soluble impurity usually has two effects on the melting point of a compound: an increase in melting point range and a decrease in melting point.

In chemistry, there are two types of impurities: soluble and insoluble.

Soluble impurities are those that dissolve in water quickly and also have a significant impact on the chemical properties of a compound such as a significant increase or decrease in the melting point and boiling point.

For example, salt, milk, and sugar compounds are soluble impurities.

Similarly, insoluble impurities remain undissolved when mixed in water and are also known as suspended impurities.

Examples of insoluble impurities are sand, oil, chalk, rocks, pebbles, etc.

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Florence is only able to find 0. 015 m aqueous ki/i2 on the reagent cart, so they perform a dilution by combining 10 ml of water and 10 ml of the available reagent. They now have 0. 0075 m aqueous ki/i2 which can be used at station there is no difference in the chemical composition of the solution because water was already present in the solution.

Florence is a type of flask used as an item of laboratory glassware and is named after the city Florence. here Florence flask is only able to find 0. 015 m aqueous Ki/i2 on the reagent cart they perform a dilution by combining 10 ml of water and 10 ml of the available reagent They now have 0. 0075 m aqueous Ki/i2 which can be used at station there is no difference  because water was already present in the solution water is only present on the reagent cart.

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Ka for HX is 1.12×10⁻⁹.

Balanced chemical equation for the reaction of sodium hydroxide (NaOH) with weak acid (HX):

NaOH + HX ⇄ NaX + H2O

n(NaOH) = 0.10 mol; amount of sodium hydroxide

V = 1.00 L; volume of the solution

c(HX) = (0.3 mol - 0.1 mol) / 1.00 L

c(HX) = 0.2 M; concentration of a weak acid

c(NaX) = 0.1 M; concentration of a salt

pH = 8.65

Henderson–Hasselbalch equation: pH = pKa + log(cs/ck).

8.65 = pKa + log(0.1 M / 0.2 M)

8.65 = pKa - 0.30

pKa = 8.95

Ka = 10∧-8.95

Ka = 1.12×10⁻⁹; the acid dissociation constant

Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.

This buffer is example of weak acid (HX) and its conjugate base (X⁻).

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The molecular weight of ethanol, in the alcohol in alcoholic beverage, is 46.1 amu.

What is ethanol?

Ethanol is a substance derived from organic compounds. With the chemical formula C2H6O, it is an alcohol. EtOH, its chemical name, is also occasionally abbreviated as CH3CH2OH or C2H5OH. Alcohol is a highly flammable, colorless liquid with a strong wine-like odor and astringent flavor.

Pharmaceuticals, polymers, lacquers, polishes, plasticizers, and cosmetics are all made with ethanol. Ethanol is used in medicine as an antidote for methanol or ethylene glycol intoxication as well as a topical anti-infective.

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The density of the gold will be 2.82 g/ [tex]cm^3[/tex].

The density of a substance is the ratio of the mass of the substance and its volume.

Mathematically, density = mass/volume

In this case; mass of gold = 1.5 kg or 1500 g, height of gold = 8.1 cm

Being a perfect 8.1 cm tall means the gold is a cube.

Volume of a cube = [tex]l^3[/tex]

Volume of gold = 8.1 x 8.1 x 8.1

                           = 531.441 [tex]cm^3[/tex]

Thus; density of gold = 1500/531.441

                                   = 2.82 g/ [tex]cm^3[/tex]

The density of the gold is, therefore, 2.82 g/ [tex]cm^3[/tex].

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The 1 m solutions of C6H1O6 have the highest vapor pressure at a given temperature.

Vapor pressure is defined as the tendency of a liquid to convert into a vapor state. The vapor pressure depends on temperature, surface area, intermolecular forces, and the number of moles of a substance.

The higher the number of moles of particles in solute, the lower the vapor pressure and vice versa.

C6H12O6 has the highest vapor pressure among the given options because it has the lowest number of moles or particles in the solute. The remaining options have more moles of particles in the solute.

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