calculate the stoichiometric ox-f mass ratio for the reaction between ch4 and o2. show the necessary step

Answer:

3 exothermic reaction. only that much

Hi,

These are the answers.

• Question 2. C , Substance dissolves

• Question 3. D , Exothermic reaction

• Question 4. C , Endothermic reaction takes place

• Question 5. A , the products formed has more energy than reactants

Hope it helps you... pls mark brainliest if it helped you

The oxyanion hole is a structural feature found in many enzymes, including chymotrypsin, that stabilizes the transition state of the reaction and enhances catalytic efficiency.

The oxyanion hole is formed by a cluster of amino acid residues that interact with the carbonyl group of the substrate and facilitate its deprotonation during catalysis.

In chymotrypsin, the oxyanion hole is formed by the backbone amide groups of two amino acids: serine 195 and glycine 193. While serine 195 is part of the catalytic triad (together with histidine 57 and aspartic acid 102), glycine 193 is not. Instead, glycine 193 is located near the catalytic triad and helps to orient serine 195 in the correct position for substrate binding and catalysis. Together, the oxyanion hole and catalytic triad form a highly efficient system for cleaving peptide bonds in proteins.

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Answer:10

Explanation:

Multiply the volume by the density to get the mass.

Divide the mass by the molar mass to get the number of moles.

                                     What is initial concentration​?

High initial concentration of spilled oil has a negative effect on the biotransformation process that causes a significant lag phase of about 2–4 weeks. Even after biostimulation, at least a week is needed for microorganisms to adapt and the entire bioremediation process may require months and even years to be completed (Atlas, 1995; Zahed et al., 2010a). The rates of uptake and mineralization of many organic compounds by a microbial population depend on the concentration of the compound (Olivera et al., 1997; Rahman et al., 2002).

If 5.0 mol of the CO₂ are produced, the number of the moles of the O₂ were reacted is 10 mol. The correct option is a. none of these.

The chemical equation is as :

CH₄ + 2O₂ → CO₂ + 2H₂O

The number of the moles of the CO₂ = 5 mol

The number of the moles of the CO₂ = mas / molar mass

The molar mass of the CO₂ = 44 g/mol

The 2 moles of the O₂ produced by the 1 mole of the CO₂

The number of the moles of the O₂ = 2 × 5 mol

The number of the moles of the O₂ = 10 mol.

The number of the moles of the O₂ required to produced 5 mol of the CO₂ is the 10 mol of the O₂. The correct option is a.

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Answer:

The correct answer is C

Explanation:

light refracts whenever it travels at an angle into a substance with a different refractive index(optical density)

The carbonyl peak wavenumber shifts to the left by 30 in a conjugated system compared to a non-conjugated one.

In an IR spectroscopy, the carbonyl peak is characterized by a strong absorption band between 1710-1730 cm-1. The carbonyl peak is due to the stretching of the C=O bond. In non-conjugated systems, the carbonyl peak has a wavenumber of 1710-1730 cm-1, but in conjugated systems, the peak shifts to the left by 30 cm-1 to a wavenumber of 1680-1700 cm-1. The reason for this shift is that in conjugated systems, the carbonyl group is delocalized, meaning that the electrons in the carbonyl double bond are spread out over a larger area. This delocalization reduces the strength of the C=O bond and causes the peak to shift to the left. This shift allows to distinguish between a non-conjugated and conjugated carbonyl compound.

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Restriction of potassium electrolytes is recommended in the management of high blood pressure.

High blood pressure

a condition when the blood exerts too much pressure on the arterial walls.

Blood pressure beyond 140/90 is typically regarded as hypertension; blood pressure above 180/120 is regarded as severe hypertension.

Many times, high blood pressure goes unnoticed. If left untreated, it can eventually lead to illnesses like heart disease and stroke.

Blood pressure can be lowered by eating a less salty diet, moving frequently, and using drugs.

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Answer:

Explanation:

The ozone layer acts as a shield for life on Earth. Ozone is good at trapping a type of radiation called ultraviolet radiation, or UV light, which can penetrate organisms' protective layers, like skin, damaging DNA molecules in plants and animals.

Answer

False

Explanation:

Carbon dioxide molecules can absorb and emit infrared radiation, and they are one of the most abundant constituents of Earth's atmosphere.

Thus, the correct options are:d) Are one of the most abundant constituents of Earth's atmospheree) Can move in many ways, thus absorbing and emitting infrared radiation

Carbon dioxide is a trace gas present in the Earth's atmosphere. It's a vital component of Earth's carbon cycle, which helps to regulate Earth's temperature and support life as we know it. Carbon dioxide molecules are one of the most common gases in the atmosphere, accounting for around 0.04% of the Earth's atmosphere.

The greenhouse effect is caused by carbon dioxide, methane, and other greenhouse gases. When the Sun's energy reaches the Earth's surface, it is absorbed and then radiated back into space as infrared radiation. Greenhouse gases absorb this radiation and trap it in the atmosphere, which causes the Earth's temperature to rise and the climate to change.

Carbon dioxide molecules are capable of absorbing and emitting infrared radiation due to their molecular structure, which consists of one carbon atom and two oxygen atoms. This property of carbon dioxide is the main reason it's classified as a greenhouse gas.

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Salts that will generate an acidic solution: A) MgSO⁴, D) NH⁴CI, and G) Cu(NO³)².

Salts that will generate a basic solution: B) LiF, C) K²S, and J) K²CO³.

Salts that will generate a neutral solution: E) NaCH³COO, F) Csl, H) KBr, and I) FeCl³.

Different salts can generate solutions with varying pH levels, indicating their acidic, basic, or neutral properties.

The salts MgSO⁴, NH⁴CI, and Cu(NO³)² will generate acidic solutions when dissolved in water. This is because they release hydrogen ions (H⁺) into the solution, increasing its acidity.

On the other hand, salts like LiF, K²S, and K²CO³ will produce basic solutions. They contain hydroxide ions (OH⁻) or produce hydroxide ions when dissolved, which increase the concentration of hydroxide ions and raise the pH, making the solution more alkaline.

Salts such as NaCH³COO, Csl, KBr, and FeCl³ will lead to neutral solutions as they do not significantly affect the concentration of H⁺ or OH⁻ ions when dissolved.

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Answer:

A. Coefficients

Explanation:

that's the number in front of the molecules

When a rod of metal is heated intensely, its predominant color will change from red through orange to white and then to blue.

The process of heating changes the color of the rod of metal. In the beginning, it will appear red, followed by orange, white, and ultimately blue. A red-hot rod appears red when its temperature is relatively low. When the rod temperature increases, it will change colors, eventually becoming blue.

Change in the color of metal as the temperature increases:

Initially, when a rod of metal is heated, its temperature is relatively low. When a rod's temperature is about 500-800 degrees Celsius, it starts to glow red. When the temperature is increased, the metal becomes hotter, and the red color appears brighter. When the metal reaches 1000-1200 degrees Celsius, the red color changes to yellowish-orange. When the temperature is increased, the metal turns white hot, and its color changes to blue when the temperature reaches 1400 degrees Celsius or higher.

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Answer:

A

Explanation:

The molecules in both metal and surrounding air will start moving slower because of the sudden decrease in environment tmeperature. The thermal energy around the metal plate decreases, also decreasing the kinetic energy.

The molecule which would have the highest boiling point is 2-methylhexane. Thus, the correct option will be D.

The boiling point is the temperature at which the vapor pressure of a liquid is equal to the external pressure. The boiling point of a liquid is a measure of its vapor pressure. The higher the boiling point, the higher the vapor pressure of the liquid, and the more heat is required to vaporize it.

The boiling point of a substance is affected by the strength and types of intermolecular forces. The stronger the intermolecular forces, the higher the boiling point. 2-methylhexane has highest boiling point because it has the highest number of carbons and branches, which contribute to its strong intermolecular forces that lead to a higher boiling point.

Therefore, the correct option is D.

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The required mass of water vaporized is 15.5 grams, from a 250 gram sample of water at the boiling point had 35.0 kj

Given: Mass of water (m) = 250 gHeat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/mole

To find:Mass of water vaporized (x) Formula:q = ΔHvap × nx = (q / ΔHvap) × nMass = moles × molar mass

We know that molar mass of water (H2O) = 18 g/molMoles of water vaporized (n) = (35.0 kJ / 40.6 kJ/mol) = 0.861 mol

Therefore,Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5  

Detailed Solution: According to the given statement,250g of water was taken at its boiling point and 35.0 kJ of heat was added to it, we need to find how many grams of water were vaporized. To solve this question, first, we need to know the heat of vaporization for water, which is 40.6 kJ/mole. It means to vaporize 1 mole of water, 40.6 kJ of heat is required.

Mass of water (m) = 250 g Heat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/molen = q / ΔHvapn = (35.0 kJ / 40.6 kJ/mol) = 0.861 molMoles of water vaporized (n) = 0.861 mol

Therefore, Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5 g Hence, the required mass of water vaporized is 15.5 grams.

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An explosión happens when asteroids collide.

When asteroids collide, little bits are expelled at orbital speeds that are slower than the original asteroids'.

When asteroids collide, the ejected pieces have speeds that are low compared to the original asteroid's orbital speed. As a result, the pieces' orbits are near to one another, creating a "family" of smaller asteroids.

A massive impact between two asteroids may have caused the Earth to enter an ice age some 466 million years ago. The asteroid that was destroyed by the cosmic collision between Mars and Jupiter, which was around 93 miles (150 km) broad, was covered in a dense cloud of dust that travelled across the inner solar system.

The asteroids that might destroy the world if they struck the Earth are exceedingly uncommon. They would most likely need to be around a kilometre apart.

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Answer:

Answer is NH4Cl and AgNO3

Explanation:

:)

The investigation that makes it hard to control variables is an observational study.

When the independent variable is not under the researcher's control due to ethical considerations or logistical limitations, an observational study infers information from a sample to the community.

The main distinction between observational studies and experimental designs is that the answers of participants are unaffected, whereas in experiments at least some participants are randomly assigned to receive a treatment condition.

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Answer:

\(m_{H_2}=0.504gH_2\)

Explanation:

Hello,

In this case, since the reaction is:

\(2 Na + 2 H_2O \rightarrow 2 NaOH + H_2\)

We notice that since there is an excess of water, we can directly compute the yielded grams of hydrogen by using the following stoichiometric procedure, considering the 2:1 molar ratio between sodium and hydrogen (notice the 2 before the sodium and the 1 before the hydrogen at the chemical reaction) and that gaseous hydrogen has a molar mass of 2 g/mol:

\(m_{H_2}=11.50gNa*\frac{1molNa}{22.98gNa} *\frac{1molH_2}{2.02molNa} *\frac{2gH_2}{1molH_2} \\\\m_{H_2}=0.504gH_2\)

Best regards.

Answer:

0.503g of H₂ are produced

Explanation:

Based on the chemical reaction:

2 Na + 2 H₂O → 2 NaOH + H₂

2 moles of Na react with 2 moles of water to produce 2 moles of NaOH and 1 mole of H₂

11.50g of Na -limiting reactant, molar mass 22.99g/mol- are:

11.50g× (1mol / 22.99g) = 0.500 moles of Na.

As 2 moles of Na produce 1 mole of H₂:

0.500 moles of Na × (1 mole H₂ / 2 moles Na) = 0.250 moles of H₂

As molar mass of H₂ is 2.01g/mol:

0.250 moles of H₂ × (2.01g / 1mol) = 0.503g of H₂ are produced

The formation of H2 (g) and Cl2 (g) during hydrolysis in the presence of NaCl is due to the difference in reduction potentials of the half-cell equations and the selective reduction and oxidation of the ions present in the solution.

The best explanation for the formation of H2 (g) and Cl2 (g) during the hydrolysis of water in the presence of NaCl lies in the standard reduction potentials of the half-cell equations given in the accompanying table.

It can be observed that the reduction potential of Cl2 is much higher than that of O2, and the reduction potential of H2 is much lower than that of Na. This means that Cl2 has a stronger tendency to be reduced than O2, and H2 has a weaker tendency to be oxidized than Na.

During hydrolysis, the water molecule is split into H+ and OH- ions. The H+ ions are reduced by the Cl- ions to form HCl, which then reacts with more H+ ions to form H2 gas.

The OH- ions are oxidized by water molecules to form O2 gas and more OH- ions. The Na+ ions, however, have a higher tendency to be oxidized than the water molecule, so they do not participate in the reaction.

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Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question we have

\(density = \frac{2.06}{3.10} \\ = 0.664516..\)

We have the final answer as

Hope this helps you

Answer:

The answer to that question is 24 AMU.

Explanation:

I know this because i got the answer correct on the quiz. To get the average, you just add the 4 atomic masses given to you together then divide by 4.

a) KCl: Ionic bond -  KCl exhibits ionic bonding due to the transfer of electrons from potassium to chlorine, resulting in the formation of K+ and Cl- ions.

b) Nonpolar covalent bonds (specific compound not mentioned) -  The bond type cannot be determined without specifying the compound, as nonpolar covalent bonds occur when electrons are shared equally between atoms.

c) Polar covalent bonds (specific compound not mentioned) - The bond type cannot be determined without specifying the compound, as polar covalent bonds arise when there is an unequal sharing of electrons, resulting in partial charges.

d) BCl3: Nonpolar covalent bonds -  BCl3 exhibits nonpolar covalent bonds because boron and chlorine have similar electronegativities, resulting in equal electron sharing.

e) Polar covalent bonds The bond type cannot be determined without specifying the compound, as polar covalent bonds occur when there is an unequal sharing of electrons, resulting in partial charges

a) KCl: Ionic bond

Ionic bonds exist between K+ and Cl- ions in KCl. Ionic bonds are formed between a metal cation (K+) and a nonmetal anion (Cl-) through the transfer of electrons.

b) Nonpolar covalent bonds

Nonpolar covalent bonds are characterized by equal sharing of electrons between atoms. The compound mentioned is not specified, so we cannot determine the exact compound that exhibits nonpolar covalent bonds.

c) Polar covalent bonds

Polar covalent bonds occur when there is an unequal sharing of electrons between atoms, resulting in partial charges. The compound mentioned is not specified, so we cannot determine the exact compound that exhibits polar covalent bonds.

d) BCl3: Nonpolar covalent bonds

BCl3 (boron trichloride) exhibits nonpolar covalent bonds. In BCl3, boron (B) forms three single covalent bonds with chlorine (Cl) atoms. The bonds are nonpolar since boron and chlorine have similar electronegativities, resulting in equal sharing of electrons.

e) Ionic bonds

Ionic bonds exist between oppositely charged ions. The compound mentioned is not specified, so we cannot determine the exact compound that exhibits ionic bonds.

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The correct ranking of compounds in order of increasing keq for this equilibrium is Acetone < Propanone < Benzaldehyde.

The correct ranking of compounds in order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is

Acetone < Propanone < Benzaldehyde.

In the above reaction, the cyanide ion acts as a nucleophile and attacks the carbonyl carbon atom in the carbonyl compound to form an intermediate compound. Then the intermediate compound formed by the reaction between HCN and the carbonyl compound undergoes an intramolecular rearrangement to form cyanohydrin.Based on the stability of intermediate compound formed, the order of increasing stability is as follows:

Acetone < Propanone < Benzaldehyde.

Since the keq is directly proportional to the stability of the intermediate, the order of increasing keq for the equilibrium of each of the carbonyl compounds with HCN to produce cyanohydrins is

Acetone < Propanone < Benzaldehyde.

The correct ranking of compounds in order of increasing keq for this equilibrium is

Acetone < Propanone < Benzaldehyde.

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Answer:

C

Explanation:

As we can see here the precipitation spikes in June and the evaporation amount starts to increase. Let's test these 4:

A:

'The lake level will drop because there is more evaporation than precipitation'

As we can see, there is more precipitation than evaporation, so A is not correct.

B:

The lake level will drop because there is more precipitation than evaporation

Evaporation means that water (literally) disappears into thin air, so B would not be correct, as precipitation raises the water level

C:

The lake level will rise because there is more precipitation than evaporation

This is the correct answer, since 1) there is more precipitation than evaporation in June and 2) it makes sense that the lake level will rise with more precipitation.

There we have it! The answer is: C