In the bohr theory of the hydrogen atom, an electron moves in a circular orbit about a proton, assume the radius of the orbit is 5. 29 10-11 m.

P-aminobenzoic acid is an organic compound with the chemical formula C₇H₇NO₂. When sulfuric acid (H₂SO₄) is added to a solution of p-aminobenzoic acid, it can cause the precipitation of the compound.

This is due to a chemical reaction that occurs between the acid and the amino group (-NH₂) on the benzene ring of the p-aminobenzoic acid. Sulfuric acid is a strong acid that can donate protons (H⁺) to other molecules, such as p-aminobenzoic acid.  When it is added to a solution of p-aminobenzoic acid, the sulfuric acid reacts with the amino group to form an ammonium sulfate salt, which is not soluble in water.

The ammonium sulfate salt then precipitates out of solution as a solid, causing the p-aminobenzoic acid to also precipitate out.The reaction between p-aminobenzoic acid and sulfuric acid is an example of a salt formation reaction.  This type of reaction involves the combination of an acid and a base to form a salt and water. In this case, the amino group on the p-aminobenzoic acid acts as the base, while the sulfuric acid acts as the acid.

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Answer:

Group 2

Explanation:

Group 12 and 13 is incorrect because they're are most likely to gain electrons making it a negative ion. even if it loses electrons it will most likely lose more than one or two. Group 1 is incorrect because it can not form a +2 ion because it has only one electron to begin with. Therefore group 2 is correct.

Answer:

Group 2

Explanation:

The given problems are related to isotopes for 1 st solution it is ¹²O isotope with 8 protons and electrons and for ³He there are 1 neutron ,2 electron and mass number is 3.

Isotopes are defined as substances having same number of protons but different number of neutrons.Number of protons is characteristic for determining position of elements in the periodic table.

Since,all isotopes have the same number of protons and hence have same position.They have similar chemical properties as they have same number of electrons.

They find applications in the field of nuclear medicine and oil and gas research . There are 2 types of isotopes : stable and unstable

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19 ml of a 5m solution of sodium borate must be added to a 200 ml solution of 50mm boric acid in order for the ph to be 9.6

Here pH=Pka-log[A]/[B]

= 9.6=9.24-log[A]/[B]

= log[A]/[B]=-0.36

Here for ml molarity formula is used

Molarity=mass/volume here mass of sodium borate is 381g/mol and volume of solution is 200ml

mass/volume=381/200=1.905/5.0×50=19ml

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Answer:

348 g FeCO3

Explanation:Use your 3 mol's and find the atomic number of Iron II and CO3 which i think is 115.854 so you multiply it by the 3 and that should give you your grams in FeCO3.

Answer:

Tc

Explanation:

You just have to follow the rows with the exponents. Just remember that when we get to d, the number in the front is a period lower. Hope this helps!

Answer:

A

Explanation:

APEX

The sulfur dichloride has bent shape.

i.e, option A is correct one.

The three dimension (3D) representation of molecule by excluding lone pair of electron is called shape of the molecule.

The geometry and shape of the molecule is determined by using some theories like valence bond theory, hybridization and VSPER theory.

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The more electron-withdrawing atoms near the hydrogen atom, the weaker the bond to the hydrogen and the weaker the acid will be. Electron-withdrawing atoms or groups, such as halogens or oxygen, can pull electron density away from the hydrogen atom, making it less acidic.

The relationship between molecular structure and acid strength can be described by the following statements:

(ii) The stronger the bond between a hydrogen atom and its neighbor, the weaker the acid. A stronger bond between the hydrogen atom and its neighboring atom makes it more difficult for the hydrogen atom to dissociate and release a proton, resulting in a weaker acid.

(iii) The more electron-withdrawing atoms near a hydrogen atom, the weaker the bond to the hydrogen and the stronger the acid will be. Electron-withdrawing atoms or groups can weaken the bond between the hydrogen atom and its neighboring atom, making it easier for the hydrogen atom to dissociate and increase the acidity.

(iv) The weaker the bond between a hydrogen atom and its neighbor, the weaker the acid. A weaker bond between the hydrogen atom and its neighboring atom facilitates the dissociation of the hydrogen atom and enhances the acidity.

(v) The less electron-withdrawing atoms near the hydrogen atom, the weaker the bond to the hydrogen and the stronger the acid will be. Electron-withdrawing atoms or groups can weaken the bond between the hydrogen atom and its neighboring atom, making it easier for the hydrogen atom to dissociate and increase the acidity.

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The main reason for adding solvent slowly to a volumetric flask is to ensure that the final volume of the solution is accurate and precise.

Volumetric flasks are designed to contain a specific volume of liquid at a particular temperature and require careful handling to achieve the desired result. By adding solvent slowly and with care, the final volume can be precisely measured and controlled, reducing the risk of error and ensuring that the concentration of the solution is accurate. Additionally, adding solvent slowly helps to minimize the formation of air bubbles, which can affect the final volume of the solution and its accuracy. Overall, adding solvent slowly to a volumetric flask is an important step in achieving accurate and precise measurements in chemical experiments.

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Answer:

b. forest ....

I think ansesters also lived in forest by wearing leaves like their clothes .... etc

Lazzaro Spallanzani concluded that boiling the broth killed any potential living organisms and that air was not necessary for life, based on the results of his experiments boiling broths and sealing the flasks.

Lazzaro Spallanzani was an Italian scientist who lived in the late 18th century. In his experiments, he boiled broths for extended periods of time and then sealed the flasks by melting their glass necks closed. By doing this, he aimed to determine the conditions necessary for life to exist.

The results of his experiments showed that boiling the broth killed any potential living organisms and that the broth did not contain any new microorganisms after being sealed and boiled. This led Spallanzani to conclude that air was not necessary for life and that life could not arise spontaneously from non-living matter.

These findings were crucial in disproving the then-prevailing idea of spontaneous generation, which was the belief that life could arise spontaneously from non-living matter. Spallanzani's experiments paved the way for further advancements in microbiology and the understanding of the origins of life.

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The approximate focal length of an objective lens is 8.42 mm.

The magnification of eye piece (m1)=10

Total magnification (m)=200

using,

m=m1*m2

200=10*m2

m2=20

Thus, magnification of objective lens=20

Using the formula for magnification of objective lens,

m2=1+L/f

20=1+0.16/f

f=0.16/19

=0.00842 m

8.42 mm

Therefore, the focal length is 8.42 mm.

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Answer:

Electrons are negatively charged, and so are attracted to the positive end of a battery and repelled by negative end.

Explanation:

Answers

A and D

Explanation

Biomass fuel is produced from organic materials, so trees and corn plants apply.

First of all, Z is unknown. I hope it is a mistake.

        Now, it is given that the element X has nineteen electrons. This proves that X is actually Potassium.

        As per the periodic table, both Potassium and Lithium belongs to group 1 as their valency is 1 because of the presence of only one electron in the outermost shell of electrons i.e., they lose an electron during a chemical reaction to form a stable compound. Furthermore, both are metallic.

        Magnesium belongs to group 2 and hence its valency is two, which is different from potassium though it is metallic. Similiarly, bromine belongs to group 17 and gains one electron during a reaction in contrast to potassium.

( No internal links available for reference. For clarification, check the periodic table).

The total heat absorbed by the 5.0-gram sample of ammonia during the time interval is 735.7 J.

Given that the mass of ammonia (NH3) sample is 5.0 g.

The time interval absorbed is 11.0 seconds. The enthalpy change of the calorimeter is -14.2 J/°C.

The specific heat of the calorimeter is 8.2 J/g°C.

Therefore, the total heat absorbed by the 5.0-gram sample of ammonia during the time interval is;

ΔT = T final − T initial(25.5 °C − 21.3 °C) = 4.2°

Cheat absorbed = (5.0g) (4.2°C) (35.1 J/g°C)

heat absorbed = 735.7 J

The total heat absorbed by the 5.0-gram sample of ammonia during the time interval is 735.7 J.

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Indium (In), option D, would have the fewest lone pairs in its Lewis structure of the elements listed.

An element is represented in a Lewis structure by its symbol, and valence electrons are shown as dots or lines. Valence electron pairs known as lone pairs don't participate in chemical bonding.

Subtracting the total number of electrons involved in bonding from the total number of valence electrons for that element yields the amount of lone pairs in a Lewis structure.

Indium (In) is the element with the lowest atomic number and the fewest valence electrons in the list of elements. As a result, of the above structures, its Lewis structure would have the fewest lone pairs.

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The element that would have the least lone pairs in its Lewis structure is D) In (indium).

In this list of elements (Ge, Si, Pb, In), the one with the least lone pairs in its Lewis structure would be Si (Silicon). To understand why, let's briefly discuss the concept of lone pairs and Lewis structures. Lone pairs are pairs of valence electrons that do not participate in bonding, while Lewis structures represent the arrangement of atoms, bonding electrons, and lone pairs in a molecule or ion. Now, let's consider the elements in your list: A) Ge (Germanium) has 4 valence electrons and typically forms 4 covalent bonds with no lone pairs. B) Si (Silicon) has 4 valence electrons and generally forms 4 covalent bonds with no lone pairs. C) Pb (Lead) has 4 valence electrons but can form 2 or 4 covalent bonds, which could leave 1 or 0 lone pairs. D) In (Indium) has 3 valence electrons and generally forms 3 covalent bonds, leaving 1 lone pair. Comparing the elements, both Si and Ge have no lone pairs in their typical Lewis structures. However, Si is the better answer due to its smaller atomic size and higher electronegativity, which make it less likely to form structures with lone pairs compared to Ge. Pb and In typically have lone pairs in their Lewis structures, making them less suitable choices for this question

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The specific heat capacity of water is 4.18 J/(g K) and the given amount of water is more than 100 grams. We need to calculate the energy absorbed by the water to reach boiling point when 5.39 × 10^5 J of heat is supplied.

The amount of water used is not provided in the question, therefore, let's first calculate the energy required to raise the temperature of 100g of water from room temperature (25°C) to its boiling point (100°C) using the formula,Q = m × c × ΔTwhere,Q = energy absorbedm = mass of waterc = specific heat capacity of waterΔT = change in temperature of water= 100 - 25 = 75°C (since the water is heated until it just begins to boil)Thus,Q = \(100 g × 4.18 J/(g K) × 75°C= 31350 J= 31.35 kJ\) of energy is required to heat 100g of water from 25°C to 100°C.

Now, let's determine the mass of water using the amount of heat energy supplied:Q =\(m × c × ΔT, where Q = 5.39 × 10^5 Jm = Q / (c × ΔT)= 5.39 × 10^5 J / (4.18 J/(g K) × 75°C)= 204.55 g\)(approx.)Therefore, more than 100 g of water is required to absorb 5.39 × 10^5 J of heat to reach its boiling point.

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The decomposition of wastewater can lead to the following:

II. Eutrophication and algal blooms.

III. The development of dead zones.

A wastewater can be defined as a body of water that has been contaminated due to human use in homes, offices, schools, businesses etc.

Ideally, wastewater should be disposed in accordance with the local regulations and standards because they typically are unhygienic for human consumption or use. Thus, floor drain are used in the kitchen, bathroom and toilet to remove wastewater, so as to mitigate stagnation and to improve hygiene.

Generally, the decomposition of wastewater can lead to the following:

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Answer:

a mixture of molecules - Box f

atoms of a pure elementa metal - Box D

a solid compound - Box C

a mixture of elements - Box A

Explanation:

Box a has mixture of elements which forms a solid like shape but there are different elements present in the box. The box f has mixture of molecules in which many atoms are combined together. Box c has solid compound with single element.

To find Kb for the formic ion (HCOO-). The correct answer is c. 5.6 x 10^-11.

To find Kb for the formic ion (HCOO-), we can use the relationship between Ka and Kb:

Ka x Kb = Kw

where Kw is the ion product constant for water (1.0 x 10^-14 at 25°C).

Since we know Ka for formic acid is 1.8 x 10^-4, we can rearrange the equation to solve for Kb:

Kb = Kw / Ka

Plugging in the values, we get:

Kb = (1.0 x 10^-14) / (1.8 x 10^-4)

Kb = 5.6 x 10^-11

Therefore, the correct option is c. 5.6 x 10^-11.

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An astronaut, or really, anyone, would weigh less on the moon than on Earth because weight is defined as the product of mass X gravity

Answer:

The moon of the Earth is much lighter in mass than the planet itself. In addition to being smaller than Earth, the Moon is also only about 60% as dense. A person weighs less on the Moon because there is less gravitational attraction there than there is on Earth.

Explanation:

People leaving a classroom and going to different classrooms: This is a process of diffusion, where particles move from an area of high concentration to an area of low concentration. The sign for this process is negative because it results in a decrease in the concentration of particles in the initial area.

Stacking sheets of paper: This is a process of increasing order or organization, and it does not involve any significant change in energy. Therefore, the sign for this process is neither positive nor negative.

Dissolving salt in water: This is a process of dissolution, where salt crystals break down into individual ions and become surrounded by water molecules. This process involves the transfer of energy between the system and the surroundings. The sign for this process is negative because it releases energy to the surroundings.

Burning sugar: This is a process of combustion, where the sugar molecules react with oxygen in the air to produce carbon dioxide and water, releasing a large amount of energy. The sign for this process is highly positive because it involves a significant increase in energy as the bonds in the sugar molecules are broken and new bonds are formed.

Moving a pencil from one side of a desk to another: This is a process of physical movement that does not involve any significant change in energy. Therefore, the sign for this process is neither positive nor negative.

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i cant understand your question define briefly

An empirical formula is an ionic formula like NaCl.Sodium chloride is simply made up of an equal quantity of sodium and chloride ions, as this formula only states.

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Answer:

There are nine major kinds of natural resources found on the planet Earth, and all these nine major resources come under two categories, that is, renewable and nonrenewable. The renewable resources refer to the resources that get regenerated again and again over a short time duration. These include five major resources, that is, wind, solar, hydro, geothermal, and biomass.  

On the other hand, nonrenewable energy resources are the ones that are present in a very limited amount, as it takes a very long time to regenerate again. The general kinds of nonrenewable energy resources are nuclear, coal, oil, and natural gas.  

Hence, biomass, solar, and geothermal energy comes under the renewable resources category, and coal, natural gas, and oil come under renewable resources category.  

Answer: the verified answer from an expert.

Explanation: