how is the HFusion used to calculate the mass of solid that 1kJ of energy will melt?

Answer is option B- Oxaloacetate/aspartate is an alpha-keto acid/alpha-amino acid pair used in transamination.

To create the amino acid version of the keto-acid and the keto-acid version of the original amino acid, amino groups are removed from amino acids and transferred to acceptor keto-acids by the process of transamination.

An amino group is transferred from one molecule to another during transamination. The formation of -ketoglutaric acid and aspartic acid from the interaction of glutamic acid and oxaloacetic acid serves as an example of this.

The reversible transfer of an amino group from glutamate to oxaloacetate, which results in the production of aspartate, is physiologically catalyzed by the enzyme AST. The enzyme was therefore previously known as serum glutamic-oxaloacetic transaminase.

Hence, Oxaloacetate/aspartate is an alpha-keto acid/alpha-amino acid pair used in transamination.

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When solutions of strontium chloride and sodium sulphate react, two of these is a spectator ion.

So, option E is correct.

What do you mean by spectator ion?

Spectator ions may be either cations (positively-charged ions) or anions (negatively-charged ions). The ion is unchanged on both sides of a chemical equation and does not affect equilibrium. When writing a net ionic equation, spectator ions found in the original equation are ignored. Thus, the total ionic reaction is different from the net chemical reaction.

Spectator Ion Examples:

Consider the reaction between sodium chloride (NaCl) and copper sulfate (CuSO4) in aqueous solution.

2 NaCl (aq) + CuSO4 (aq) → 2 Na+ (aq) + SO42- (aq) + CuCl2 (s)

The ionic form of this reaction is:

2 Na+ (aq) + 2 Cl- (aq) + Cu2+ (aq) + SO42- (aq) → 2 Na+ (aq) + SO42- (aq) + CuCl2 (s)

The sodium ions and sulfate ion are the spectator ions in this reaction. They appear unchanged in both the product and reactant side of the equation. These ions just "spectate"  while the other ions form the copper chloride. The spectator ions are canceled out of a reaction when writing the net ionic equation, so the net ionic equation for this example would be:

2 Cl- (aq) + Cu2+ (aq) → CuCl2 (s)

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For the combustion of 1 mole of diamond at room temperature, the standard entropy change is 6.22 J/K mol.

The reaction is given as :

C (diamond)  + O₂   ----->  CO₂

At room temperature the value of S°  is given as follows :

carbon, C = 2.38 J / Kmol

oxygen, O₂ = 205.2 J/Kmol

carbon dioxide, CO₂ = 213.8 J/Kmol

The standard entropy change is given as :

ΔS° = ∑S° product  - ∑ S° reactant

ΔS° = ( 213.8 ) - ( 2.38 + 205.2)

ΔS° = 213.8 - 207.58

ΔS° = 6.22  J / K mol

The standard entropy change for the combustion of 1 mole of diamond at room temperature is 6.22  J / K mol.

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Explanation: An acidic oxide is an oxide that either produces an acidic solution upon addition to water, or acts as an acceptor of hydroxide ions effectively functioning as a Lewis acid. Examples include SO2, CO2, SO3, Cl2O7, P2O5, and N2O5.

Answer:

An acidic oxide is an oxide that either produces an acidic solution upon addition to water, or acts as an acceptor of hydroxide ions effectively functioning as a Lewis acid.[1] Acidic oxides will typically have a low pKa and may be inorganic or organic.

The total time of decay is 8.18 min.

The half life is the time to takes a substance to decay. so, we half to find out the number of half lives that have passed for initial amount of 132.8 g.

         number of half -lives        amount of substances in g

                       0                                    132.8

                        1                                     66.4

                        2                                     33.2

                        3                                      16.6

                        4                                        8.3

so. it will take 4 half -lives for the substance to decay to 8.3 g.

the total time decay = 4 × 2.045 = 8.18 min.

Thus, A substance has a half-life of 2. 045 minutes. If the initial amount of the substance was 132. 8 grams, half - life will have passed before the substance decays to 8. 3 grams. the total time of decay is 8.18 min.

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There are two molecular orbitals are needed to form one bonding molecular orbital and one anti-bonding molecular orbital.

Bond orbitals Electrons that spend most of their time between the nuclei of two atoms are placed in bonding orbitals, and electrons that spend most of their time outside the nuclei of two atoms are placed in anti-bonding orbitals.

Adding up the same number of atomic orbitals gives the same number of molecular orbitals. Two atomic orbitals combine to form two molecular orbitals. An anti-bonding orbital is essentially the opposite of a bonding orbital. They form when atomic orbitals combine in ways that lead to almost destructive interference.

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The Solubility cannot be calculated.

Solubility indicates the maximum amount of a substance that can be dissolved in a solvent at a certain temperature. Such a solution is called saturated. Divide the mass of the compound by the mass of the solvent and multiply by 100g to calculate the solubility in g/100g.

The solubility of ionic solutes does not always increase with increasing temperature. In exothermic solution reactions, solubility can decrease with increasing temperature. The number of moles of solute dissolved in a given volume of solution does not represent the solubility of the solution. They dissolve more readily and solubility increases with increasing temperature.

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False, Protons and neutrons are both present in the nucleus.

What is the nuclear force?

One of the four fundamental forces of nature, along with gravitational and electromagnetic forces, is the nuclear force. In fact, they are also referred to as strong forces since they are 10 million times more powerful than chemical binding forces. A force known as the nuclear force interacts with the protons and neutrons of atoms. The force that holds protons and neutrons in a nucleus together is known as the nuclear force. Protons and protons, neutrons and neutrons, or neutrons and neutrons can all be affected by this force. The nucleus is held together by this force.

The nucleus is at the center of an atom and accounts for the maximum mass of the atoms, a nucleus contains both protons and neutrons giving it an overall positive charge because the neutrons are of neutral or zero charges. As electrons are negatively charged and are very light in comparison to a proton or neutron, it is considered negligible in front of them. Due to the negative charge of the electron, it is under an attractive force known as the nuclear force from the nucleus, as we know opposite charges attract.

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Acids include hydrochloric acid (HCl) and bases include sodium hydroxide (NaOH). As a result, when they combine, they have a neutralization reaction that produces water and sodium chloride.

The pH rises to about 7 as a result of neutralization, which happens when a base and a base combine. It is a useful technique that is applied in daily life, for example when lime is added to acid soils to treat and relieve indigestion. Furthermore, neutralization results in an alkali's pH dropping to about seven.

Taking a base balances out our stomach's excess acid. Due to the formic acid in the ant sting, it can be painful. Using wet baking soda, which really is basic in nature, we can counteract this acid impact and lessen the agony brought on by the sting.

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Ionic bonding is expected in KF because in it one is metal and one is non-metal which is essential to form an ionic bond.

What is Ionic bonding?

Ionic bonding is a kind of chemical bonding that includes the electrostatic attraction among oppositely charged ions, or among two atoms with sharply different electronegativities, and is the number one interplay taking place in ionic compounds. It is one of the primary styles of bonding alongside with covalent bonding and metal bonding. Ions are atoms (or organizations of atoms) with an electrostatic charge. Atoms that advantage electrons make negatively charged ions (called anions). Atoms that lose electrons make undoubtedly charged ions (called cations). This switch of electrons is thought as electrovalence in assessment to covalence.

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Pyruvate is produced by the reaction of a glycolysis. The multienzyme complex catalyzes the oxidative of pyruvate to yield carbon dioxide and acetyl coa. Its reaction is given as

Pyruvate+CoA+NAD⁺→acetyl CoA+NADH+H⁺+CO₂

Acetyl CoA→Citric acid cycle

Glycolysis process is defined as the conversion of a glucose(C₆H₁₂O₆) into the pyruvate(CH₃COCO₂H). In the glycolysis reaction, high energy ATP molecules and reduced nicotinamide adenine dinucleotide is created. The series of ten enzyme-catalyzed process makes up glycolysis.

One of the metabolic route which does not require is glycolysis(In anaerobic conditon, pyruvate is converted to lactic acid). It is occurred in various species, which tells us that it is old metabolic route.

Therefore, the glycolysis reaction produces pyruvate and its complete reaction is

Pyruvate+CoA+NAD⁺→acetyl CoA+NADH+H⁺+CO₂

Acetyl CoA→Citric acid cycle

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Answer:

A fire could cause an increase in evaporation of water from surface water near the fire.

Explanation:

Answer:

Explanation:

Wildfires can compromise water quality both during active burning and for months and years after the fire has been extinguished. Burned watersheds are prone to increased flooding and erosion, which can negatively affect water-supply reservoirs, water quality, and drinking-water treatment processes.

Wildfires can have immediate and long term effects on rivers, lakes, and streams. After burning vegetation, the ground's soil becomes hydrophobic and is unable to absorb any water. This creates what is known as stormwater runoff. Stormwater runoff is rainflow that travels over the surface of the ground.

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When 3.45 L of a 0.35 M H₃PO₄  to be diluted to a volume of 10.00 L, The concentration of H₃PO₄ resulted is 0.1207 M

The concentration of H₃PO₄  can be calculated as follows:

Dilution is the process of reducing the concentration of a solute in solution, usually by simply mixing the solute with more solvent by adding water to the solution.

The formula (M1V1=M2V2) represents the dilution formula in chemistry.

M1V1=M2V2

3.45 L x 0.35 M = M2 X 10.00 L

M2 =  3.45 L x 0.35 M

                10.00 L

M2 = 0.1207 M

Therefore, when 3.45 L of a 0.35 M H₃PO₄  to be diluted to a volume of 10.00 L, The concentration of H₃PO₄ resulted is 0.1207 M

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Answer:

G) It would speed up evaporation.

Explanation:

As the temperature increases, the rate of evaporation also increases.

Answer:

if an element has atomic number of 15 then the atom has 15 electrons also.

Option (b)

Explanation:

remember the atomic number of an element is also the number of protons of that element, we know that protons have a positive charge, neutrons have no charge and electrons have a negative charge.

we also know that an element is atomically neutral, meaning it overall has no charge, this is because the positive proton attracts a negative electron and hence their charges cancel off.

this is why in all elements, the atomic number(proton number) will always be equal to the electron number.

Note the neutron number cannot be predicted this way, as far as I know, the neutron purpose is mainly to add Mass to the atom so that it can be more stable, though often times the neutron number is similar to the proton number also. You're not required to learn off atomic masses as far as I know because it will be given to you in the exams

The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure.

It is used to demonstrate how the electrons in a molecule are positioned around particular atoms.

Electrons are shown as "dots" or, in the case of a bond, as a line connecting the two atoms. The octet rule and formal charges must be met in order to achieve the "best" electron configuration.

A Lewis structure is a visual representation of the electron distribution around atoms. The reason for learning to draw Lewis structures is to forecast the amount and type of bonds that may be formed around an atom.

Therefore, The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure.

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The Lewis structure of the compound is shown in the image attached to this answer.

We know that the Lewis structure shows us what a compound looks like. The two parts of the Lewis structure would include the symbol of the element as well as the electron dots that can be used to show the number of valence electrons. This is why we call the Lewis structire the Lewis dot structure of a compound.

We can see that the compound here has an amine group as well as a carboxylic group and the Lewis structure would tell us the number of electron pairs that we have on the valence shell of  each of the atoms.

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The separation compound using diffrence in boiling point melting point like physical properties.

What is physical properties.

A physical property is the any  measurable property that  whose value describes the state of a physical in  system. Changes in the  system's physical properties of  can be used to describe its transitions between the  momentary of state.

A physical property is a characteristic of the  matter that is not associated with in a  change in its chemicals composition. Familiar to the  examples of physical  properties that is include density, color, hardness, melting and boiling points, and the  electrical conductivity.

There are mainly two types of physical properties extensive and intensive.

Sol-The separation scheme to  used to separate the mixture of   based on differences in this  physical properties- such as boiling point melting point, solubility in a given solvent these are the three components.

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Answer: 0.2 g

Explanation:

Reactivity decreases as you move from left to right. The farther to the left and down the periodic chart you move, easier it is for electrons to be given or taken away, hence resulting in higher reactivity.

Reactivity decreases as we move down the column. As you learn more about the table, you will be able to find that this pattern is true for other families.

The atoms get bigger, as the atomic number increases. The chemical properties change slightly when compared to the element right above them on the table. The non-metal elements in Group 7 that are known as the halogens, get less reactive as you move to the down of the group.

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Social engineering types of infiltration techniques does one open up to by posting sensitive personal information and details about one's workplace on social networking sites.

What is the which means social engineering?

Social engineering is an assault vector that is predicated closely on human interplay and frequently includes manipulating human beings into breaking regular safety techniques and satisfactory practices to benefit unauthorized get entry to systems, networks or bodily places or for economic benefit.

Is social engineering a cybercrime?

Social engineering is a manipulation approach that exploits human blunders to benefit personal information, get right of entry to, or valuables. In cybercrime, these “human hacking” scams generally tend to trap unsuspecting customers into exposing data, spreading malware infections, or giving get right of entry to constrained systems.

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1) Covering with greases on the iron  stops air and water from being in contact with the iron.

2) The substance that can react with copper to make  copper carbonate is silver carbonate

3) The combustion of lithium produces lithium oxide

4) The table is not shown hence the question can not be answered

5) another metal, oil and grease

6) The chemical reaction creates new substances.

7)  ​​A corrosion reaction is a chemical reaction that happens on the surface of a metal.

8) .In a chemical equation, the reactants and products are different from each other.

9)  ​​As silver reacts with polluted air, a black compound,  silver oxide is formed.

In the process of oxidation, we are just burning up a substance in oxygen. When we burn the substance in oxygen, there is an increase in the oxidation number of the object and oxygen is also added to the object. This is what we call oxidation of a substances.

Now we know that oxygen is abundant in the universe and thus it can be used in the burning of a substances. In effect we can look at the process of combustion as a situation in which we burn an object in air.

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The percentage yield of the given reaction is 77.33%.

What is percentage yield?
Reactants frequently produce fewer product quantities than predicted by the chemical reaction's formula. The percentage of a theoretical yield that's been produced in a reaction is calculated using the percent yield formula. Working through a stoichiometry problem yields the theoretical yield, which is the ideal quantity of the final product. The actual yield is determined by calculating the volume of the product formed. We can determine the percentage yield by dividing the actual yield by the theoretical yield.

Moles is calculated by using the formula:
Moles of Ammonia:
Given mass of ammonia = 150g
Molar mass of ammonia = 17 g/mol
Putting values in above equation, we get:

Moles of Oxygen
Given mass of oxygen = 150g
Molar mass of oxygen = 32 g/mol
Putting values in above equation, we get:
For the given chemical equation:

By Stoichiometry,
5 moles of oxygen reacts with 4 moles of ammonia.
So, 4.6875 moles of oxygen will react with =  of ammonia
As, moles of ammonia required is less than the calculated moles. Hence, ammonia is present in excess and is termed as excess reagent.
Therefore, oxygen is considered as a limiting reagent because it limits the formation of products.

By Stoichiometry of the given reaction:
5 moles of oxygen gas produces 4 moles of nitric oxide
So, 4.6875 moles of oxygen gas will produce =  of nitric oxide

Now, to calculate the theoretical amount of nitric oxide, we use equation 1: Molar mass of nitric oxide = 30 g/mol
 Given mass of nitric oxide = 112.5 g
Now, to calculate the percentage yield, we use the formula:
Experimental yield = 87 g
Theoretical yield = 112.5 g
Putting values in above equation, we get:
Hence, the percentage yield of the given reaction is 77.33%.

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The product of the reaction is m-nitrobenzaldehyde, option B.

M-nitrobenzaldehyde, also known as meta-nitrobenzaldehyde is an organic aromatic compound that contains a nitro-group which is meta substituted to an aldehyde. It is soluble in water at 2.34 mg/ml and a temperature of 25° C. It is also soluble in ethanol, benzene and slightly in ether. M-nitrobenzaldehyde production process is prepared by nitration.

The carboxylic group is meta directing and has an ortho-para deactivating group therefore, during nitration of benzaldehyde, meta position gains an attachment from the nitro group forming m-nitrobenzaldehyde as product.

The full question is:

Predict the major product for the reaction shown.

a. o-cyanonitrobenzene & p-cyanonitrobenzene

b. m-nitrobenzaldehyde

c. o-cyanonitrobenzenesulphonic acid & p-cyanonitrobenzenesulphonic  acid

d. m-cyanonitrobenzenesulphonic acid

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The molarity of the solution is  0.0597 M.

We know that the molarity has to do with the number of moles of the substances that is found in a  given volume of solution. Thus the term molarity has to do with the amount of substance that is present.

We have that;

Mass of the sodium chloride = 2.26g

Molar mass of the sodium chloride = 40 g/mol

Volume of the solution = 0.946 L

Number of moles = 2.26g/ 40 g/mol

= 0.0565 moles

Molarity = 0.0565 moles/0.946 L

= 0.0597 M

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The  Sodium chloride reacts with fluorine gas to produce solid sodium fluoride and chlorine gas is 2Na+F₂→2NAF.

What is Sodium chloride ?

One of the most prevalent minerals on Earth and a crucial nutrient for many animals and plants is sodium chloride (NaCl), also known as salt. Seawater and underground rock formations are two natural sources of sodium chloride.

What is fluorine?

The most reactive element in all of chemistry is fluorine (F), which is also the first member of the halogen family. Both fluorides and fluorides-containing compounds, both organic and inorganic, are referred to by the terms "fluoride" and its ionic form (F-), respectively.

∴2Na+F₂→2NAF

Therefore, Sodium chloride reacts with fluorine gas to produce solid sodium fluoride and chlorine gas is 2Na+F₂→2NAF.

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A measure of how compact matter is is what density means. How much "stuff" is crammed into an area, to put it simply.

In science, density is defined as the ratio of an object's mass to volume. Mathematical and scientific density comparisons are done using a formula.

In disciplines, such as physics, the focus is on things and matter and relates the notion to the rules of nature.

It is a calculable and manipulable formula in mathematics. In other disciplines, such as social sciences, density relates with population. The amount of people in a specific land area produces the population density.

Therefore, A measure of how compact matter is is what density means. How much "stuff" is crammed into an area, to put it simply.

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Equations 1 & 2, Equations 2&3, and Equations 1&3 illustrate a favorable energetic coupling in a cell.

What is the non-spontaneous reaction?
A nonspontaneous reaction is one that under the specified conditions, does not favour the formation of products. A reaction needs to be endothermic, accompanied by the a drop in entropy, or both to qualify as nonspontaneous. The majority of the gases that make up our atmosphere are a combination of nitrogen and oxygen.

If G is positive, the reaction is not spontaneous and will need external energy. The reaction seems to be spontaneous and will happen on its own if G is negative.

Coupling of reactions-
Equations 1 and 2-
∆G1=-7kcal/mol, ∆G2=-14.8kcal/mol
∆G total= -21.8kcal/mol( favourable reaction)
Equation 2&3-
∆G2=-14.8kcal/mol, ∆G3=+3.3kcal/mol
∆G total=-11.5kcal/mol(favourable)
Equations 3 and 4-
∆G3=+3.3kcal/mol, ∆G4= +7kcal/mol
∆G total=+10.3kcal/mol(unfavorable)
Equations 1 and 4-
∆G1=-7kcal/mol, ∆G4=+7kcal/mol
∆G total= 0(reaction will be in equilibrium)
Equations 1 and 3-
∆G total=(-7+3.3)kcal/mol
=-4.3 kcal/mol(favorable)

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