What is the base dissociation constant for a week base at equilibrium B+H2O=BH++OH-?

Answer:

I think the answer is Temperature but i don't know your options so I'm just going off of my test

Explanation:

Answer:

2 Fe + 3 H2SO4 —> Fe2(SO4)3 + 3 H2

I hope I helped you^_^

Answer:

If your lab has litmus paper, you can use it to determine your solution's pH. When you place a drop of a solution on the litmus paper, the paper changes color based on the pH of the solution. Once the color changes, you can compare it to the color chart on the paper's package to find the pH.

Explanation:

A solution's pH will be a number between 0 and 14. A solution with a pH of 7 is classified as neutral. If the pH is lower than 7, the solution is acidic. When pH is higher than 7, the solution is basic. These numbers describe the concentration of hydrogen ions in the solution and increase on a negative logarithmic scale.

For example, If Solution A has a pH of 3 and Solution B has a pH of 1, then Solution B has 100 times as many hydrogen ions than A and is therefore 100 times more acidic.

Solution = 5,500g

NaOH = 22% of 5,500g

Therefore mass of NaOH is :

0.22 × 5,500g

1,210g

Meaning 1,210 grams inside the solution is Sodium hydroxide

The mass of sodium hydroxide in a solution that has a total mass of 5,500g and is 22% NaOH by mass is 121,000 g.

Mass percent of any substance present in any solution will be calculated as:
Mass % = (Mass of substance) / (Mass of solution)

In the question given that,

Mass percent of NaOH = 22%

Mass of solution = 5,500 g

On putting these values on the above equation we get,

Mass of NaOH = (22)×(5,500) = 121,000 g

Hence required mass of NaOH is 121,000 g.

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Answer:

Explanation:

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

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

volume = final volume of water - initial volume of water

volume = 49.10 - 45.50 = 3.6 mL

We have

\(density = \frac{28.5}{3.6} \\ = 7.91666666...\)

We have the final answer as

Hope this helps you

The experiments of wöhler, kolbe, miller, and other chemists invalidated the concept of vitalism by demonstrating that B) organic molecules could be produced apart from living organisms using inorganic materials.

Concept of vitalism propose that organic molecules could only be synthesised by living organism. Modern science said that vitalism has no credibility.

Adolph Wilhelm Hermann Kolbe (1818 - 1884) contributed to invalidate the concept of vitalism. He made the organic substance acetic acid from inorganic carbon disulfide.

Friedrich Wöhler (1800 - 1882) synthesis of the organic compound urea from inorganic substances.

Abiotic factors are non-living chemical and physical things of the environment.

Abiotic factors can include water, light, radiation, temperature, humidity, atmosphere, and soil.

On the contrary, biotic factors are all of the living organisms within an ecosystem.

Missing options:

A) carbon atoms were common in both living organisms and nonliving substances such as rocks and soil

B) organic molecules could be produced apart from living organisms using inorganic materials

C) tissues extracted from living organisms could still promote organic reactions

D) one organic substance could be transformed into another organic substance

E) complex organic substances are the result of a series of sequential synthetic reactions occurring in both living organisms and nonliving systems.

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Meiosis is important because it ensures that all organisms produced via sexual reproduction contain the correct number of chromosomes. Meiosis also produces genetic variation by way of the process of recombination. HOPE it helps

From thermal comfort point of view, thick walled structures are beneficial in hot and humid climates is the statement that is true.The correct option is C.

Thick walled structures are beneficial in hot and humid climates from the thermal comfort point of view.How do thick walled structures help in hot and humid climates - In hot and humid climates, thick walls tend to absorb the heat present in the environment. This absorption helps to keep the interior of the structure cool.

Additionally, thick walls take more time to heat up and more time to cool down. Thus, in hot and humid climates, thick walls are a better choice than thin walls because they provide thermal comfort.

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Under a rate law where \(C_2H_4\) and \(Br_2\) are both elevated by a factor of two. As a result, choice c is the appropriate response.

The rate law consistent with the proposed mechanism is:
rate = \(k[C_2H_4][Br_2]1/2\)

This is because the second step is the rate-determining step, meaning it is the slowest step in the mechanism and limits the overall reaction rate. The rate law for the slow step involves both \(C_2H_4Br\) and Br, but since Br is a reactant in the first step, we can substitute [Br] in terms of \([Br_2]\) using the fast equilibrium step. This results in a rate law with both \(C_2H_4\) and \(Br_2\) raised to the power of 1/2. Therefore, the correct answer is option c.

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The buoyancy force acting on the sand core during pouring is 16.49 N.

The buoyancy force is equal to the weight of the fluid displaced by the object. In this case, the object is the sand core and the fluid is the molten bronze alloy.

The volume of the sand core is : volume = mass / density

volume = 3 kg / 1.6 g/cm^3

volume = 1.875 cm^3

The weight of the displaced molten bronze alloy is :

weight = volume * density

weight = 1.875 cm^3 * 8.77 g/cm^3 = 16.49 g

The buoyancy force is equal to the weight of the displaced molten bronze alloy, which is 16.49 g or 16.49 N.

Calculate the buoyancy force:

buoyancy force = weight

buoyancy force = 16.49 g = 16.49 N

Therefore, the buoyancy force acting on the sand core during pouring is 16.49 N.

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The bonding that occurs between the atoms of a PCl5 molecule is covalent bonding.

This type of bonding involves the sharing of electrons between atoms to achieve a stable electron configuration. In PCl5, the phosphorus (P) atom shares its five valence electrons with five chlorine (Cl) atoms, which each share one electron with the phosphorus atom.

This results in a molecule with a trigonal bipyramidal shape, where the phosphorus atom is at the center and the five chlorine atoms occupy the vertices of the two triangular bases. The shared electrons are attracted to the nuclei of both the phosphorus and chlorine atoms, creating a strong bond between them.

 The covalent bonding in PCl5 is an example of a polar covalent bond, where the electron density is unevenly distributed between the atoms due to the electronegativity difference between phosphorus and chlorine.

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Answer: Wheat flour, edible oil, egg white, lettuce preservative, meat or poultry marinade, vegetable antibacterial wash.

Explanation:

hydrogen peroxide is used as a bleaching agent in some food

I hope this helped

Answer/Explanation:

No compounds must be made up of two or more elements. otherwise it wouldn't be a compound. There must be some type of combination or it isn't a compound.

Answer:

the day where the daylight and night are equal in the Spring

Answer:

A. Japan

Explanation:

Answer:

japan xd

Explanation:

The balanced symbol equation for the Haber process, which is the industrial method for producing ammonia, is N2 + 3H2 → 2NH3

A. The Haber process is the industrial method for producing ammonia, and the balanced equation for the reaction is:

N2 + 3H2 → 2NH3

The atom economy for a product is the percentage of the total mass of reactants that becomes the desired product. For ammonia, the atom economy can be calculated as follows:

Molar mass of NH3 = 14.01 + 3(1.01) = 17.04 g/mol

Atom economy of NH3 = (2 mol NH3 x 17.04 g/mol) / [(1 mol N2 x 28.02 g/mol) + (3 mol H2 x 2.02 g/mol)] x 100% = 34.0%

B. To calculate the theoretical yield of ammonia, we need to use the given mass of nitrogen and the stoichiometry of the balanced equation. The molar mass of nitrogen is 28.02 g/mol, so 27.3 g of nitrogen is equal to:

27.3 g / 28.02 g/mol = 0.974 mol N2

According to the balanced equation, 1 mole of N2 reacts with 3 moles of H2 to produce 2 moles of NH3. Therefore, the theoretical yield of ammonia is:

Theoretical yield of NH3 = (0.974 mol N2) x (2 mol NH3 / 1 mol N2) x (17.04 g/mol NH3) = 33.1 g NH3

C. The percentage yield of the reaction can be calculated by dividing the actual yield of ammonia by the theoretical yield, and then multiplying by 100%. The actual yield of ammonia is given as 29.9 g:

Percentage yield of NH3 = (29.9 g NH3 / 33.1 g NH3) x 100% = 90.4%

D. The percentage conversion of hydrogen can be calculated by dividing the mass of hydrogen used in the reaction by the mass of hydrogen that would have been used if all of it had been consumed in the reaction. The mass of hydrogen used is 10.4 g, and the mass of hydrogen that would have been used if all of it had been consumed in the reaction is:

1( mol H2 x 2.02 g/mol) x (0.974 mol N2 / 1 mol N2) = 1.98 g H2

Therefore, the percentage conversion of hydrogen is:

Percentage conversion of H2 = (10.4 g H2 / 1.98 g H2) x 100% = 525% (This result is not possible, as the percentage conversion cannot be greater than 100%. It is likely that there was an error in the calculation or in the data provided.)

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In the given section, a mole can be defined as the amount of a substance that contains the same number of entities as there are atoms in 12 grams of pure carbon-12.

n grams and moles are related to the number of atoms, molecules, or other particles because one mole of any substance contains Avogadro's number of particles, which is 6.022 x 10²³ particles per mole.

For example, if you have 10 moles of a substance, then you have 6.022 x 10²⁴ particles of that substance. The relationship between moles and the number of particles is directly proportional to each other.

Therefore, if you increase the number of moles of a substance, you increase the number of particles of that substance.The number of atoms, molecules, or other particles in a sample is related to the mass of the sample.

The number of moles of a substance is proportional to the mass of the sample.

The relationship between the number of moles and the mass of a substance is given by the formula : n = m / M

where n = no. of moles ;

m = mass of the substance (in g) ;

M = molar mass of the substance in grams per mole.

Thus, the required answer is explained above.

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Answer:

6.2

Explanation:

17.0 g of Al₂O₃ forms from 16 g of O₂ and excess Al ,and when the molar mass of  Al₂O₃ is 102 g/mol.

Molar mass is the mass of one mole of a substance. It is usually expressed in units of grams per mole (g/mol). For example, the molar mass of carbon is 12.01 g/mol, which means that one mole of carbon has a mass of 12.01 grams. Molar mass is useful in chemistry because it allows us to convert between mass and moles of a substance, which is important for many chemical calculations.

The molar mass of  Al₂O₃ is 102 g/mol, which means that for every 102 g of  Al₂O₃ produced, 3 × 32 g (or 96 g) of O₂ is consumed.

We can use this ratio to find the mass of  Al₂O₃ formed from 16 g of O₂:

96 g of O₂ produces 102 g of  Al₂O₃

1 g of O₂ produces (102 g / 96 g) of Al₂O₃

16 g of O₂ produces (102 g / 96 g) × 16 g = 17.0 g of  Al₂O₃

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The correct answer is 100 times more because each pH unit represents a 10x difference in hydrogen ion concentration.

The pH scale is logarithmic, meaning that each unit change in pH represents a tenfold difference in the concentration of hydrogen ions (H⁺).

For example, a solution with a pH of 2 has a concentration of H+ ions that is 10 times higher than a solution with a pH of 3. Similarly, a solution with a pH of 2 has a concentration of H+ ions that is 100 times higher than a solution with a pH of 4.

Therefore, a solution with a pH of 2 has 100 times more hydrogen ions (H⁺) than a solution with a pH of 4.

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This reaction is exothermic is the chemical reaction of \(C_4H_8\)+ \(O_2\)--- \(CO_2\)+ \(H_20.\)

Exothermic reactions in chemistry refer to chemical reactions that release energy in the form of heat, light, or sound. During an exothermic reaction, the reactants have a higher energy level than the products, resulting in the release of excess energy in the form of heat, light, or sound. The opposite of an exothermic reaction is an endothermic reaction, in which energy is absorbed from the surroundings.

One common example of an exothermic reaction is combustion, in which a fuel reacts with oxygen to produce heat and light. Another example is the reaction between an acid and a base, which results in the release of heat and the formation of a salt and water. Exothermic reactions play an important role in many biological and chemical processes, including metabolism, respiration, and the production of energy.

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Fuel-efficient cars help decrease the global dependency on nonrenewable resources because they use less fuel than other vehicles to travel the same distance.

Nonrenewable resources are natural resources that cannot be readily replaced or regenerated, such as fossil fuels (coal, oil, and natural gas), minerals, and some metals. These resources are finite and once they are used they cannot be replenished. They are formed over millions of years and are essential for the functioning of modern society, but their extraction and use can have negative impacts on the environment.

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Answer:

As the plates travel horizontally past one other, no crust is formed nor destroyed.

Explanation: tectonic plates

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:

During electrolysis of Copper (II) Chloride, metal ions change from being soluble in the solution to insoluble at the surface of the cathode because metals are not soluble in water ; gains two electrons.

Explanation:

The solution would appear blue in color since the absorption peak is in the blue region of the visible spectrum.

The transition metal complex in solution has an absorption peak at 450 nm, which is in the blue region of the visible spectrum. This means that the complex absorbs blue light. As a result, the color we observe in the solution would be the complementary color of blue, which is orange. Therefore, the solution appears orange in color.

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The equation for this reaction is

\(\text{Mg}+\text{O} \longrightarrow \text{MgO}\)

This means that for every mole of magnesium consumed, 1 mole of magnesium oxide is produced.

So, the answer is 0.094 moles.