Consider the following reaction:


4 NH3 + 3 O2 → 2 N2 + 6 H2O


If the rate of formation of N2 is 2.00 mol L-1 s-1, the rate at which NH3 reacts is:

Answer:

OD. Ka = 1.62 × 10-12

Explanation:

An acid is weak the smaller the Ka value, so the weakest acid in this case is the one with a Ka=1.62 × 10-12.

The ionization values belong to the element magnesium (Mg). Ionization values help us determine the amount of energy that will be required to remove one or more electrons from an atom. The third period is where we can locate the element that has these ionization values.

These ionization values are listed in the table given below:Element: Mg (Magnesium)First ionization energy: 738 kJ/molSecond ionization energy: 1450 kJ/molThird ionization energy: 7732.7 kJ/mol

For a neutral atom, the first ionization energy (IE1) is the amount of energy required to remove an electron from the outermost shell. As we move from left to right in a period, the ionization energy increases. In the third period, Mg (magnesium) has first, second, and third ionization energies of 738 kJ/mol, 1450 kJ/mol, and 7732.7 kJ/mol, respectively. Magnesium is a chemical element that has an atomic number of 12. It has two valence electrons and is located in group 2 of the periodic table. Magnesium has a melting point of 1,202°F (650°C) and a boiling point of 1,994°F (1,090°C). It is a silver-white metal that is widely used in the manufacture of alloys and other industrial applications.

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Answer:

6 : Formula is for cellular respiration

Explanation:

C₆H₁₂O₆ + 6O₂    →  6CO₂ + 6H₂O + ATP energy

C₆H₁₂O₆ = glucose

O₂ = oxygen

CO₂ = carbon dioxide

H₂O = water

ATP energy = Adenosine triphosphate energy

There are two types of respiration:

1. Aerobic respiration  

2. Anaerobic respiration

Aerobic respiration

It is the breakdown of glucose molecule in the presence of oxygen to yield large amount of energy. Water and carbon dioxide are also produced as a byproduct.

Glucose + oxygen → carbon dioxide + water + 38ATP

Anaerobic Respiration

It is the breakdown of glucose molecule in the absence of oxygen and produce small amount of energy. Alcohol or lactic acid and carbon dioxide are also produced as byproducts.  

Glucose→ lactic acid/alcohol + 2ATP + carbon dioxide

Starch is a covalent compound as it possesses long chains of glucose molecules that are bonded through covalent bonds.

In a covalent compound, the covalent bonds are involved where the mutual sharing of electrons that can hold all atoms or molecules together. Shared electrons are difficult to give away as nuclei of two atoms together share the electrons and create the bond stronger.

Ionic compounds can be demonstrated as compounds prepared between a cation and an anion. A cation can be defined as an electropositive ion and can lose valence electrons. Similarly, anions are electronegative ions and can a tendency to gain electrons.

Starch can be defined as a polysaccharide composed of 1,4 linkages between glucose monomers. The linear polymer amylose can be defined as the most basic form of starch, while amylopectin can be defined as the branched form.

Therefore, Starch is a covalent compound because of the covalent bonds between the glucose molcules.

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Answer:

structure of atom

states of matter

classification of elements and periodicity in properties

thermody namic

Equilibrium

Redox reacation

Answer:

mass of sodium chlorate required = 55.4 g (3 sig figs)

Explanation:

In chemical equations, unless stated otherwise, the reactants and products will theoretically always remain in stoichiometric ratios.

The stoichiometry of a reaction is the relationship between the relative quantities of products and reactants, typically a ratio of whole integers.

Consider the following chemical reaction: aA + bB ⇒ cC + dD.

The stoichiometry of reactants to products in this reaction is the ratio of the coefficients of each species: a : b : c : d.

Now let's apply this knowledge to the question to be attempted:

first, we can start by writing out a balanced chemical equation, with states.

2NaClO₃(s) ⇒ 2NaCl(s) + 3O₂(g)

Hence, the stoichiometry of this reaction is 2 : 2 : 3. This means that the moles of NaClO₃ = moles of NaCl = 2/3 × moles of O₂.

Now if we can convert the mass of O₂ into moles, then we can calculate the moles of NaClO₃, and thus the mass of NaClO₃.

Now, to speed things up a bit, we will use the formula n = m/M, where

Therefore, n(O₂) = m/M = 25.0/(16.00×2) = 0.78125 mol

n(NaClO₃) = 2/3 × n(O₂) = 2/3 × 0.78125 = 0.52083 mol

Finally, rearranging the original formula to find mass,

m(NaClO₃) = n×M = 0.52083×(22.99+35.45+16.00×3) = 55.4 grams

The unit of f''(a) is milliliters/minute^2

The function t=f(a) models the time, in minutes, for a chemical reaction to occur as a function of the amount a of catalyst used, measured in milliliters.

So, here double differentiation is to be done.

t=f(a)

differentiating with respect to t,

d(t)/dt = d(f'(a))/dt

or, d(f'(a))/dt = 1

again differentiating with respect to t,

d [d(f'(a))/dt]/dt = d(1)/dt = 0 ...1

or, f''(a) = 0

so, here if we put 'unit expression' in Left hand side of 1

it is d [d(f'(a))/dt]/dt  i.e.  mililiters/miniute/minute [as given t is measured in minute and f(a) is measured in ml)

or, ml/minute^2

so as we are performing double differentiation, the unit of f''(a) is milliliters/minute^2

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Answer:

Yes

Explanation:

The compounds have both hydrogen and carbon only which are atoms that make up the hydrocarbons and they are also gases at room temperature

Balanced trade refers to a situation in which a country's income from exports is equal to its expenditure on imports. This equilibrium in trade is reflected in the country's balance of trade statement, which records the value of exports and imports of goods and services. The net export, representing the difference between total exports and total imports, can be positive or negative.

In economics, a trade deficit occurs when a country's total imports surpass its total exports. Conversely, a trade surplus happens when a country's total exports exceed its total imports. These imbalances in trade are indicators of the economic relationship a country has with other nations.

The trade balance is an important concept in a country's economy and is calculated by subtracting the value of imports from the value of exports. A trade surplus occurs when a country earns more from its exports than it spends on imports, leading to increased export revenue. On the other hand, a trade deficit arises when a country's spending on imports exceeds its income from exports.

It is important to note that balanced trade does not necessarily imply a positive or negative outcome. It simply indicates a state where export earnings match import expenditures. The implications of balanced trade depend on various factors, including the country's economic goals, competitiveness, and overall economic conditions.

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Answer:

Matter

hope this helps

Answer:

matter

Explanation:

Did the test

My reaction to the claim that human remains dated at 10 million years old were found in Asia using carbon-14 dating would be one of skepticism. Carbon-14 dating is not reliable for dating objects older than about 50,000 years.

Carbon-14 has a half-life of approximately 5,730 years, meaning that it decays over time and becomes undetectable after a certain point. Therefore, using carbon-14 dating to determine the age of remains from 10 million years ago would not provide accurate results. To accurately date remains from such an ancient period, other dating methods like potassium-argon dating or uranium-lead dating would be more appropriate. In conclusion, carbon-14 dating is not suitable for determining the age of human remains that are 10 million years old due to its limited range of accuracy.

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When ions are tightly attached to solvent molecules they are called as solvated ions.

When separation occurs, the solute is divided into ions or molecules, and every ion or molecule is surrounded by a solvent. The bonding between the solute particles and solvent molecules is called solvation. A solvated ion or molecule is surrounded by solvent molecules. For example, when we add NaCl to water, the NaCl molecules split into Na⁺ and Cl⁻ ions. These ions of sodium and chlorine then get surrounded by water molecules. We can call the ion water mixture a solution and the surrounded ions of sodium and chlorine as solvated ions.

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The solution in question is a buffered solution created by mixing 0.34 M NH3 (a weak base) and 0.26 M NH4F (the salt of a weak acid and a weak base):- the pH of the buffered solution after the addition of 0.10 mol of H+ ions is 9.07, option d.

The buffering capacity of the solution is due to the ability of NH3 and NH4+ to react with H+ and OH- ions, respectively.

When 0.10 mol of H+ ions is added to 1.0 L of the solution, they react with the NH3 to form NH4+. The amount of NH4+ formed can be calculated using the balanced chemical equation:

NH3 + H+ -> NH4+

moles of NH4+ = moles of H+ added = 0.10 mol

The initial concentration of NH4+ in the solution was 0.26 M. The amount of NH4+ formed due to the addition of H+ ions can be added to this initial concentration to give the total concentration of NH4+ in the solution:

[NH4+]total = [NH4+]initial + moles of NH4+ formed / volume of solution
[NH4+]total = 0.26 M + 0.10 mol / 1.0 L
[NH4+]total = 0.36 M

The concentration of NH3 in the solution can be calculated using the Kb value and the concentration of NH4+:

Kb = [NH3][OH-] / [NH4+]
1.8 x 10^-5 = [NH3][10^-pOH] / 0.36 M
[NH3] = Kb x [NH4+] / [OH-]
[NH3] = (1.8 x 10^-5) x 0.36 M / 10^-4.3
[NH3] = 6.26 x 10^-4 M

The pH of the solution can be calculated using the equation:

pH = pKa + log([A-]/[HA])

where pKa is the negative logarithm of the acid dissociation constant of NH4+, A- is NH2- (the conjugate base of NH3), and HA is NH4+.

The pKa of NH4+ can be calculated from the Kb value:

Kw = Ka x Kb
1.0 x 10^-14 = pKa x 1.8 x 10^-5
pKa = 9.74

Using the concentrations of NH3 and NH4+ calculated above, we can calculate the concentrations of NH2- and NH4+:

[NH2-] = [NH3] = 6.26 x 10^-4 M
[NH4+] = 0.36 M

Substituting these values into the equation for pH gives:

pH = 9.74 + log(6.26 x 10^-4 / 0.36)
pH = 9.07

Therefore, the pH of the buffered solution after the addition of 0.10 mol of H+ ions is 9.07, option d.

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Answer:

I think it will 25 this is the answer of this qn

neutrons : atomic mass - atomic number so

53-25

28 is the answer

Answer:

A, Heat is released as the reaction happens.

Explanation:

Exothermic reactions release heat and/or light and is a reaction in which the overall enthalpy is negative. The one your mouse is hovering over explains Nuclear Fission. The third one explains an endothermic reaction, as heat is absorbed in the reaction. The product being cold is actually one of the key characteristics of an endothermic reaction. Two liquids being mixed that forms a solid is called a precipitate.

Answer:

A) 20

B) 40

C) Ca

D) 10

E) 9

F) F

Explanation:

The MASS NUMBER is the number of protons + the number of neutrons.

The ATOMIC NUMBER is the number of protons.

You can take the MASS NUMBER - ATOMIC NUMBER = NUMBER OF NEUTRONS.

Each element is unique and distinguished by the NUMBER OF PROTONS = ATOMIC NUMBER, ie...the number of protons in its nucleus. You can find the element's name and symbol on the Periodic Table.

To produce one molecule of glucose, 6 molecules of carbon dioxide (\(CO_{2}\)), 18 molecules of adenosine triphosphate (ATP), and 12 molecules of nicotinamide adenine dinucleotide phosphate (NADPH) are required.

Glucose, a six-carbon sugar, is synthesized through the process of photosynthesis in plants. It involves the Calvin cycle, which incorporates carbon dioxide, ATP, and NADPH to produce glucose. For each molecule of glucose formed, 6 molecules of carbon dioxide are required.

The energy needed for glucose synthesis is provided by ATP, which is an energy-rich molecule. In the Calvin cycle, the synthesis of one glucose molecule requires 18 molecules of ATP.

NADPH, a coenzyme involved in energy transfer reactions, is required for the reduction of carbon dioxide during the Calvin cycle. In the process, 12 molecules of NADPH are utilized to produce one molecule of glucose. These components play crucial roles in capturing and storing energy, as well as providing carbon atoms for the formation of glucose, which serves as a vital energy source for organisms.

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The boiling point of water is dependent on the pressure exerted on the liquid. In this case, water boils at 90°C when the pressure exerted on the liquid equals 101.3 kPa, which is equivalent to atmospheric pressure. At different pressures, the boiling point of water will vary.

The boiling point of a substance is the temperature at which its vapor pressure equals the external pressure exerted on the liquid. When the external pressure is equal to the vapor pressure, the liquid starts to vaporize and boil.

In the given options, the pressure values are provided, and we need to determine which pressure corresponds to the boiling point of water at 90°C.

At standard atmospheric conditions, the pressure is approximately 101.3 kPa, which is equivalent to 1 atmosphere (atm) or 760 mmHg. This is also known as the normal boiling point of water, where water boils at 100°C.

Based on this information, we can conclude that option (3) 101.3 kPa is the correct choice. At this pressure, water boils at 90°C.
Therefore, the boiling point of water is affected by the pressure exerted on the liquid, and at 101.3 kPa, water boils at 90°C. At higher pressures, such as option (4) 120 kPa, water would boil at a higher temperature, and at lower pressures, such as options (1) 65 kPa or (2) 90 kPa, water would boil at a lower temperature.

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Answer:

The process in which trace amounts of other elements are added to a material to make it a semiconductor is called doping.

Doping is the process of adding impurities, called dopants, to a semiconductor material in order to create a controlled number of free electrons or holes. The dopants are typically elements that have one more or one less electron than the semiconductor atoms, so they can be easily incorporated into the crystal lattice. The dopants create a region within the semiconductor called a p-type or n-type region, depending on the type of dopant used, which can be used to control the flow of electrical current through the material.

Explanation:

Answer:

law

Explanation:

Answer:

c

Explanation:

Answer:

It helps you......

. Thank you ☺️☺️

Atoms of different elements have unique spectral lines because each element has a unique set of electron orbits. The correct option is C.

Spectral lines are dark or bright lines in the spectrum of an object created by absorption or emission of light of a specific wavelength. Spectral lines are generated when electrons in atoms are excited and move from one energy level to another.

When they return to their original energy level, the energy that was absorbed is released in the form of light. Spectral lines are used by astronomers to examine the composition of stars, galaxies, and other astronomical objects.

Atoms of different elements have unique spectral lines because each element has a unique set of electron orbits. Electrons orbit the nucleus in specific energy levels, and the wavelength of light that is absorbed or emitted when an electron moves from one energy level to another is determined by the element's unique electron configuration.

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The major product is 2-bromopyridine.

1. The reaction begins with the protonation of the pyridine ring by the  (hydronium ion), forming the pyridinium cation. This step enhances the electrophilicity of the carbon atoms on the pyridine ring.

2. The bromide ion (Br-) acts as a nucleophile and attacks one of the electrophilic carbon atoms on the pyridinium cation. The nucleophilic attack results in the displacement of a proton from the pyridinium ring and formation of a C-N bond.

3. After the formation of the C-N bond, the proton on the nitrogen atom is transferred to the adjacent carbon atom, leading to the formation of the final product, 2-bromopyridine.

Overall, the mechanism involves the protonation of the pyridine ring, nucleophilic attack by the bromide ion, and subsequent proton transfer to give the desired product, 2-bromopyridine.

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Explanation:

Opposite hemispheres have opposite seasons, no matter the earth's rotation, because of the earth's tilt. The earth's tilt is responsible for all seasons.

Mass of sulphur present in sample of Na2S2O3 (Sodim Thiosulphate) weighing 33.6 g would be 13.60g

Atomic mass of sulfur: 32g

Sulfur present in 1 molecule of Sodium thiosulphate: 2 atoms

Mass of sulfur in 1 mole of Sodium thiosulphate :

2 * atomic mass of sulphur

2 * 32 = 64g

Which means 158.1 g of Sodium Thiosulfate has 64 grams of sulfur in it...
We're given 33.6 g of sodium thiosulfate which will contain :

(33.6 * 64) / 158.1g = 13.60 g of Sulfur

Pityriasis versicolor, cyanide poisoning, and cisplatin side effects are all treated using sodium thiosulfate, also known as sodium thiosulphate.

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Neutralizing them: FALSE.

Acids hp in the digestion of proteins by ;

NEUTRALISING THEM: FALSE.

PARTIALLY DENATURATING THEM: TRUE beacuse acids denature proteins and make them to lose their activity

PREVENTING THEIR ABSORPTION: FALSE

CLEAVING PEPSINOGEN:: TRUE pepsinogen os cleaved and then converted into active pepsin, which converts proteins into peptones and peptides.

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