How many chromium atoms are
present in one formula unit of
sodium chromate?
Na2CrO4
A. 2 atoms
B.7 atoms
C. 1 atoms
D. 4 atoms

8.7M  Is the solubility of Ca(oh)2  in water at a given Ksp of 6.5 .10-6  and molar mass of   74.09g/mol.

Solubility is defined as the amount of the substance  dissolved in a given amount of solvent at a certain temperature.

Ca(OH)2   à  Ca2+  +  2OH-

Ksp = 6.5 .10-6

Molar mass= 74.09 g/mol

Ksp is solubility product constant which describes the equilibrium between a solid and its ion in solution.

          Ksp=[Ca2+] [OH2-]

      6.5 .10-6 = S. (74.09g/mol +S)

      6.5 .10-6 = S .( 74.09M)

        S = 6.5 .10-6 /74.09 M

            =  8.7 M

       So, the solubility of Ca(OH)2  is  8.7M.

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The correct statement is " water molecules absorb energy when water vapor condenses to form clouds".

Condensation, which is the opposite of vaporization, would be the transformation of matter from its gaseous state into its liquid state. The water cycle is the most frequent use of the phrase.

One such illustration is the condensation that accumulates on a chilly cup's exterior or on a car's windows on a cool night. Dew, vapor, clouds, and the fog that see it when you exhale on a chilly day are more characteristics of condensation.

Therefore, the correct answer will be option (D).

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The (m/m%) concentration of ethanol is the solution is 5.55%.

The density of the solution is given to be 1.20 g/ml. The volume of the solution is 750 ml.

We know,

Density = mass/volume

Mass of solution = Density of solution x Volume of solution

Mass of solution = 1.2 x 750

Mass of solution = 900 grams.

The mass of solute, ethanol is 50 grams.

So, (m/m%) of ethanol is,

(m/m%) of ethanol = Mass of ethanol/mass of solution x 100

(m/m%) of ethanol = 50/900 x 100

(m/m%) of ethanol = 5.55%.

So, the (m/m%) of ethanol is 5.55%.

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Ammonia as proof that nitrate was converted to ammonia in the cultivation of nitrate broth Because amino acids are produced during protein synthesis, amino acid metabolism will always exist.

Nitrifying microorganisms in the soil change ammonia into nitrates. Nitrates are taken up by plants from the soil and used to assemble proteins. Animals may consume the plant, and its biomass may be used to produce animal protein.

The process of nitrate (NO3) being used as an electron acceptor for respiration microbes results in dissimilatory nitrate reduction to ammonium (DNRA), also known as nitrate/nitrite ammonification.

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Drops of the titrant will adhere to the burette's walls, thus additional solution must be diluted into the analyte to make up for this. This will result in a higher volume reading (denominator), which will lower the molarity calculation.

The titrant is a solution with a known concentration that is added to another solution in analytical chemistry to measure the concentration of a different chemical species. The standard solution, reagent, or titrant are other names for the titrant.

In contrast, the species of interest during a titration is the analyte, or titrand. The analyte concentration can be ascertained when it reacts with a titrant that has a known volume and concentration.

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Hexane is initially employed as the eluting solvent to remove the bibenzyl. The bibenzyl will be eluted first because the nonpolar molecule is particularly soluble in hexane (a nonpolar solvent) .

A mixture in chemistry is a material comprised of two or more separate chemical elements mixed together in a certain proportion. Chemical connections that are challenging to break are created when the components interact with one another. These bonds result in the development of atoms sharing or trading electrons.

Pure components and compounds can be found in nature. A element is formed up of many elements in a predetermined ratio, as opposed to an element, which is a substance comprised of the same sort of atoms.

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3.648 liters of volume in gas would be produced by the complete reaction of solid at STP according to the reaction as 1 mole of an ideal gas has a volume of 22.4 L at STP.

The given reaction is

[tex]2 Al(s) + 6 HCl (aq)[/tex] = [tex]2AlCl[/tex]₃([tex]aq[/tex])[tex]+H[/tex]₂([tex]g[/tex])

1mole of ideal gas is 22.4L

Here we have to convert the mass of Al to moles.

We know, Number of moles = Mass/Molar mass

Mass of Al = 2.93 g

Molar mass of Al = 26.98 g

Therefore, No. of moles = 2.93 g/26.98 g = 0.108 moles

The molar ratio of Al to H₂ is 2:3

As, 2 moles of Al can produce 3 moles of H₂

Then, 0.108 moles of Al can produce

(0.108 × 3)/ 2  

= 0.163 moles of H₂

Now by applying the Ideal Gases Law to calculate the volume that is been produced throughout the reaction at STP ,

The standard temperature is 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure is 1 atmosphere.

1 atm × V = 0.163 mol × 0.082L.atm(mol.K)⁻¹ × 273K

Hence,

V = (0.163 mol × 0.082 L.atm(mol.K)⁻¹ × 273K) / 1atm

V = 0.013366 × 273

Therefore, the Volume is 3.648 L

In chemistry, STP stands for Standard Temperature and Pressure. STP is most commonly used when doing gas calculations. B. Gas Density. The standard temperature is 273 K (0° Celsius or 32° Fahrenheit) and the standard pressure is 1 atmosphere. This is the freezing point of pure water at atmospheric pressure at sea level.

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Equal volumes of equimolar solutions of ammonium iodide, NH₄I, and lead (ii) acetate, Pb(CH₃COO)₂, were combined and a precipitate forms. The balanced equation is given as :

2NH₄I   +   , Pb(CH₃COO)₂   ---->  PbI₂   +   2NH₄CH₃CO₂

The ammonium iodide, NH₄I react with lead (ii) acetate, Pb(CH₃COO)₂ to form lead(II)iodide and ammonium ethanoate.  The balanced equation is given as follows :

2NH₄I        +       Pb(CH₃COO)₂   ---->  PbI₂   +        2NH₄CH₃CO₂

ammonium      lead (ii) acetate        lead(II)iodide    ammonium ethanoate

iodide

Thus, Equal volumes of equimolar solutions of ammonium iodide, NH₄I, and lead (ii) acetate, Pb(CH₃COO)₂, were combined and a precipitate forms. The balanced equation is given as :

2NH₄I   +   , Pb(CH₃COO)₂   ---->  PbI₂   +   2NH₄CH₃CO₂

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The theoretical yield of H₂O in this reaction is 31.69 Kg.

The chemical equation of the reaction of NH₃ and O₂ is,

NH₃ + O₂ → NO + H₂O

Now, balancing this equation,

4NH₃ + 5O₂ → 4NO + 6H₂O

So, as per reaction, we can see,

NH₃ is limiting reagent, hence it will decide the extent of products,

4 moles of NH₃ reacts completely with two oxygen to form 6 moles of water.

Moles = Mass reacted/formed/molar mass.

Molar mass of NH₃ = 17.04 g/mol

Reacted mass of NH₃ = 45000 g.

Molar mass of H₂O is 18 g/mol

Now, can write,

4 x (mass of NH₃ reacted/molar mass of NH₃) = 6 x (mass of H₂O formed/molar mass of H₂O)

4 x (45000/17.04) = 6 x (Formed mass of H₂O/18)

Formed mass of H₂O = 31690.14 grams.

Formed mass of H₂O = 31.69 Kg.

So, the theoretical yield of H₂O is 31.69 Kg.

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The percent error of Joe’s results is equal to 10.07 %

The percent error can be described as the difference between the actual value and the measured or approximate value. The percent experiment is used in scientific experiments to check the accuracy of the experimental results.

The mathematical formula of the percent error can be represented as:

Percentage error = (Measured value - Exact value)/Exact value] ×100

Given, the volume measured by Joe = 60.1 ml

The actual volume of the object = 54.6 ml

The percent error =  (60.1 - 54.6)/54.6] ×100 = 10.07 %

Therefore, the percentage error of Joe's results is 10.07 %.

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The oxygen molecule is 16 times heavier than the hydrogen molecule. So, the answer is false. The molar mass of gases decide the mass of the gases.

What is molar mass?

Molar mass is the mass of the substance divided by the number of moles of that substance. The SI unit of molar mass is Kg/mol. It is an intensive property. It is the mass of the substance in 1 mole of that substance.

The molar mass of hydrogen molecule (H2) is 2 g/mol. The molar mass of oxygen molecule (O2) is 32 g/mol. The oxygen molecule is heavier than hydrogen molecule.

Therefore the oxygen molecule has a molar mass of 32 g/mol which is 16 times more than the molar mass of hydrogen molecule which is 2 g/mol. The answer is false.

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The ways to write a chemical equation for a chemical reaction are:

What is the term chemical reaction?

In a chemical reaction, reactants undergo a chemical reaction and transform into products through a chemical process. For instance, By inhaling oxygen, which then combines with glucose to produce carbon dioxide, water, and energy, we are able to breathe. The response is provided below. C6H12O6 + O2 = 6CO2 + 6H2O + Energy.

Note that Reactants are the substances that are changing and are written on the left-hand side of the equation. Products are the newly produced substances.

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Answer:

The chemical formula for the ionic compound is

Na3N3

The number of electrons it take to fill the mos formed from the combination of the 3s orbitals of two atoms simply is 14 electrons.

The 3s orbital possess two different spherical nodes which is highly connected with the principal quantum number. In order words, it has 2 radial nodes. Also the shape of the 3s orbital is spherical in shape.

That being said, from the context of the above given task, the number of electrons which fill the mos formed from the combination of the 3s orbitals of two atoms is fourteen electrons.

However, the electron configuration of an atom simply is the arrangement of electrons in the electron shell or orbit of the atom of that element.

In conclusion, it can be deduced from above s orbital has a maximum of two electrons and this energy increases as the orbitals increases.

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While solids have certain shape and volume, liquids only have definite volume but not shape, gases neither have shape nor volume. The level of energy is highest in gases, medium in liquid and lowest in solids. The compression of solids is difficult, liquids are nearly incompressible, but gases can be easily compressed.

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The pH of a barium hydroxide solution obtained by dissolving 0.10 grams of barium hydroxide in 250ml of water is 17.

When barium hydroxide is dissolved in water, it forms,

Ba(OH)₂ → Ba⁺ + 2OH⁻

the concentration of the hydroxide ion in the solution will be,

Molarity = Moles of solute/volume of solution

Moles of Ba(OH)₂ = 2 moles of OH⁻

So, we can write,

0.10/171.3x2 =Moles of OH⁻

Moles of OH⁻ = 0.000291 moles.

Molarity of OH⁻ solution = 0.000291 x 1000/250

Molarity/concentration of OH⁻ solution = 0.001 mol/L

pH = 14 - p[OH]

p[OH] = log[0.001]

p[OH] = -3

pH = 14+3

pH = 17

So, the pH of the solution is 17.

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The percent change in volume is 21 %.

given that :

temperature , T1 = 273 -28 = 245 K

temperature , T2 = 273 + 9 = 282 K

pressure P1 = P

pressure P2 = P - O.O5 P = 0.95 P

Volume V1 = V

volume V2 = ?

using ideal gas equation , we get :

P1 V1 / T1 = P2 V2 / T2

V2 = (P1 V1 T2 ) / P2 T1

V2 = ( P × V × 282 ) / ( 0.95 P × 245 P )

V2 = 1.211 V

change in volume is given as = V2 - V1

                                                 =  1.211 V - V

                                                 = 0.211 V

Percent change in volume is = (0.21 V)) / V ) × 100 %

                                                 = 21 %

Thus, For many purposes we can treat propane C3H8 as an ideal gas at temperatures above its boiling point of −42.°C Suppose the temperature of a sample of propane gas is raised from -28.0°C to 9.0°C, and at the same time the pressure is increased by 5.0% . the percent change in volume in 21 %.

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The mass of the products form when baking soda decomposes is 25.00 grams

We can determine the mass of the products formed by simply observing the law of conservation matter (mass). Details below

The law of conservation of matter states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.

Thus, for every balanced chemical equation, total mass of reactants must equal to the total mass of the product obtained.

With the above information, we can detertmine the mass of the products obtained as follow:

2NaHCO₃ → Na₂CO₃ + H₂O + CO₂

Mass of reactant = Mass of product

Mass of NaHCO₃ = Mass of (Na₂CO₃ + H₂O + CO₂)

25.00 g = 25.00 g

Thus, the mass of the products is 25.00 g

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Heat is chosen to be positive when it enters a system and negative when it exits, represented by the symbol Q and unit Joule. The temperature difference between two bodies causes heat flow.

The amount of heat per unit of temperatures in a system that cannot be used to carry out beneficial work is known as entropy. Entropy is a measure of a system's molecular disorder or unpredictability since work is produced by organized molecular motion.

All spontaneous shifts in an isolated system, according to the entropy principle, occur in the direction of growing entropy. These transformations can be seen in the dispersion of gradients or the evaporation of lots of energy into low-grade energy, which eventually turns into heat energy.

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One of the regulating services provided by the ecosystem is pollination. Option B.

Ecosystem services are natural processes that are maintained by the ecosystem but which benefit man and mankind.

There are different types of services offered by the ecosystem and that benefit man immensely. These are:

The ecosystem plays a regulatory role in the pollination of plants for the benefit of mankind. Wind helps to carry pollens from the anther to the stigma of flowers. By doing so, fruits, vegetables, seeds, etc, become available for the use of man.

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Explanation:

Assume if its asking about molecule particle:

1 mol of AgNO3 = 6.022 x 10^23 molecules

0.75 mol of AgNO3 = 0.75 x 6.022 x 10^23

= 4.5165 x 10^23 molecules

Assume if its asking about atom particle:

AgNO3 has 5 elements

0.75 mol of AgNO3 = 0.75( 5 x 6.022 x 10^23)

= 2.2583 x 10^24 atoms

The earth’s magnetic poles are in the general direction of the planet’s geographic poles. the phrase "general direction" mean  different and complete opposite way.

A bar magnet that is suspended freely will always point north-south. This is a result of the bar magnet's south pole being drawn to the Earth's magnetic north pole (geographic south).

Geographic and magnetic poles on Earth are generated by various sources, thus they are not perfectly aligned. The outer core's swirling currents of liquid iron are what generate the Earth's magnetic field.

Thus, Option D is correct.

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Answer:

atom1:1s22s22p63s23p2

The first element whose atomic number is 21 is Scandium and the second element whose atomic number is 7 is Nitrogen. Based on electronic configuration

Electronic configuration is a systematic way of distributing the electrons in their orbitals  Electron configurations of atoms follow a standard notation in which all electron-containing atomic subshells (with the number of electrons they hold written in superscript) are placed in a sequence.

Electron Configurations are useful for:

Determining the valency of an element.

Predicting the properties of a group of elements (elements with similar electron configurations tend to exhibit similar properties).

Interpreting atomic spectra.

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Answer:

So the answer to the question “What is the mass concentration of hydrogen chloride in 2.0-molar hydrochloric acid?” is 73 grams per liter.

The missing component in the nuclear equation is  [tex]{{0} \atop {-1}} \right.[/tex]e.

Nuclear reactions are processes in which one or more nuclides are produced from the collisions between two atomic nuclei or one atomic nucleus and a subatomic particle. The nuclides produced from nuclear reactions are different from the reacting nuclei (commonly referred to as the parent nuclei).

In the given reaction in order to balance the reaction we can see that their mass numbers are same so the difference between them is = 0, and the difference in their atomic number is  91-90 = 1, hence the component is the [tex]\beta[/tex] particle that is formed.

This type of nuclear reaction is know as [tex]\beta[/tex]decay nuclear reactions

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A student observed a sperm cell using a microscope at magnification of x400 and sperm cell image measured 22 mm long then the actual size is = 55 μm.

A simple microscope produces an image of the object upon which the microscope is focused whereas magnification is the ability to make small objects seem larger such as making a microscopic organism also visible. Ability to distinguish two objects from each other is called as resolution

As we know that, 1 mm = 1000 μm.

So, 22mm = 22000 μm

Magnification of x400 given

We can calculate, Actual size = image size / magnification.

 = 22000/400

Actual size = 55 μm

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Dispersion does not change the chemical identity of the solute.

The dispersed phase is solute and dispersed medium is solvent. When ink is added to the water then it is dispersed in water, therefore the chemical identity is not changed.

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From the periodic trends, one atom in the same group which is larger than a sulfur atom is selenium, and one which is smaller is oxygen.

From Coulomb's Law, the size of an atom decreases with an increase in the force of attraction and decreases with an increase in the forces of repulsion.

Sulfur belongs to group 6A or 16 of the periodic table.

Elements in group 6A have six electrons in their valence shells.

The valency of elements in group 6a of the period table is usually 2, 4 or 6.

Based on the periodic trends, the atomic size of elements in group 6A increases on going down the group due to an extra electron shell added to the atoms of the elements.

The other elements in group 6A are oxygen, selenium, and tellurium. etc.

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