What is the molecular weight of Mn2Se7

Answer:

This took me a really long time I hope you like it ;]

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Explanation:

Answer:

Sodium (Na) will become Na+

Explanation:

Every atom is neutral in its natural form, meaning they have the same number of protons and electrons. When an electron is removed from an atom, it becomes a cation (positive ion) with a charge of +1. If the atom looses two electrons the new charge of the resulting ion will be +2. On the other hand if an atom gains one electron the resultiong anion (negative ion) will have a charge of -1. Loosing two electrons will form an ion with charge -2.

Answer:The correct answer is option D.

Explanation:

Electrolyte: An electrolyte is defined as those compound which dissociates into ions when dissolved in water and these ions in the solution will facilitate the movement of the electrons from the solution. Thus making it electrical conductive solution.

Good electrolytes are those electrolytes which completely dissociates or ionizes in water.Like strong acid, strong base, water soluble ionic salts(not of weak acid  or weak base).

[tex]HCl(aq)\rightarrowH^+(aq)+Cl^-(aq)[/tex]

HCL; Strong acid gets completely ionized in water.

[tex]KOH(aq)\rightarrow K^+(aq)+OH^-(aq)[/tex]

KOH; Strong base gets completely ionized in water.

Hence, the correct answer is option D.

Final answer:

A substance with a high specific heat requires more energy to increase its temperature by 25°C than a substance with a low specific heat, because it absorbs more heat without a significant temperature change.

Explanation:

A substance that requires more energy to undergo an increase in temperature has a high specific heat. Specific heat is defined as the amount of heat energy required to raise the temperature of 1 gram of a substance by 1°C. A material with a high specific heat will absorb more heat without a significant rise in temperature. For instance, water has a high heat capacity and specific heat, making it resistive to temperature change. Therefore, a substance with a high specific heat needs more energy to experience a temperature increase of 25°C compared to one with a low specific heat. Conversely, a substance with a low specific heat requires less energy to change its temperature, as its temperature will rise more quickly when heat is applied.

Answer:

At the gaseous phase the intermolecular force of attraction between atoms becomes far apart. The atoms can easily be added up with an electron or electrons can be removed from an atom.

Higher energy is required in this process.

Explanation:

Why do scientists use atoms in the gas phase to measure ionization energies and electron affinities

Electron Affinity is where there is a change in energy when  electron is added to atom in its gaseous phase. The atom becomes negatively charged.

Ionization Energy is defined as the energy required to remove an electron from gaseous atom.

At the gaseous phase the intermolecular force of attraction between atoms becomes far apart. The atoms can easily be added up with an electron or electrons can be removed from an atom.

Answer:

1 mole of uranium

Explanation:

It is the greatest with about a mass of about 238 amu or 238 g/mol

The density of solid W is 19.3 g/cm³. To find the number of atoms per cm³, we calculate the volume of one unit cell of W and then multiply by the number of unit cells. The volume of one unit cell is found using the formula for the volume of a cube. The edge length of a unit cell is 3.165 Å.

The density of solid W is given as 19.3 g/cm³. To calculate the number of atoms per cubic centimeter of W, we need to know the volume of one W atom. Since W adopts a body-centered cubic unit cell, each unit cell contains 2 atoms (1 atom in the center and 8 atoms at each corner). The volume of one unit cell can be calculated using the formula for the volume of a cube: volume = edge length³. Given that the edge length is 3.165 Å, we can convert it to cm and calculate the volume of one unit cell. Once we have the volume of one unit cell, we can calculate the number of unit cells per cubic centimeter of W.

The volume of one unit cell of W is (3.165 Å)³ = 31.152 ų. Converting this to cm³ gives us 3.1152 x 10⁻²³ cm³. To find the number of unit cells per cm³, we take the reciprocal of the volume of one unit cell: 1/(3.1152 x 10⁻²³ cm³) = 3.2054 x 10²² unit cells/cm³. Since each unit cell contains 2 atoms, the number of atoms per cm³ can be calculated by multiplying the number of unit cells by 2: 3.2054 x 10²² x 2 = 6.4108 x 10²² atoms/cm³.

The volume of one unit cell is given by the formula volume = edge length³. In this case, the edge length is 3.165 Å. To find the volume of one unit cell in cm³, we need to convert the edge length from Å to cm: 3.165 Å = 3.165 x 10⁻⁸ cm. Now, we can calculate the volume of one unit cell: (3.165 x 10⁻⁸ cm)³ = 3.1152 x 10⁻²³ cm³. The edge length of a unit cell is 3.165 Å, or 3.165 x 10⁻⁸ cm.

The ionic charge for X in the compound X3Y2, with Y having a ionic charge of -3, is +2. This is deduced from the subscripts in the compound formula which correspond to the absolute values of the ionic charges

In the field of Chemistry, the formula for a compound gives a distinct representation of the ions present and their subscripts usually indicate their ionic charges. In the compound X3Y2, the subscript of X (3) corresponds to the absolute value of the charge on the Y ion which is 3 (ignoring the negative sign since we're only interested in the absolute value) and vice versa.

Therefore, since the subscript for Y is 2, the ionic charge for X would be +2.

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The example of a single replacement reaction is as follows: Cu + 2AgNO3 → 2Ag + Cu(NO3)2. Details about single replacement reaction can be found below.

A single replacement reaction is a reaction that involves the displacement of only one element by another element.

In the reaction between copper and silver nitrate as follows: Cu + 2AgNO3 → 2Ag + Cu(NO3)2

Copper displaces silver to form copper nitrate, hence, it can be said to be an example of a single replacement reaction.

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Final answer:

The mass of 3.01 x 10^23 molecules of oxygen is 9.632 x 10^23 grams.

Explanation:

The mass of 3.01 x 10^23 molecules of oxygen can be calculated using the concept of molar mass. The molar mass of oxygen (O2) is 32.00 g/mol.

Therefore, the mass of 1 mole of oxygen is 32.00 g.

Using this information, we can set up a conversion factor to find the mass of 3.01 x 10^23 molecules:

1 mole of O2 = 32.00 g

3.01 x 10^23 molecules of O2 = x grams

Cross multiplying gives us:

x = (3.01 x 10^23 molecules of O2 * 32.00 g) / 1 mole of O2

x = 9.632 x 10^23 g

Therefore, the mass of 3.01 x 10^23 molecules of oxygen is 9.632 x 10^23 grams.

Answer:

synthesis

Explanation:

  The reaction equation properly written is shown below:

               4Al + 3O₂ → 2Al₂O₃

  A synthesis reaction is a form of combination of atoms. It involves the formation of a single product from two or more reactants.

Decomposition is the formation of two or more products from a single reactant.

Single replacement is a reaction in which one substance is replacing another.

In double displacement, there is an actual exchange of partners to form new compounds.

Answer:

synthesis

Explanation:

Explanation:

When 30 grams of barium chloride crystals when heated at 400 degree Celsius and again weighed again which comes to be 20 grams. This means that water of crystallization associated with the barium chloride crystal got vaporized when heated at 400 degree Celsius.

Water of crystallization: Water molecules associated to a crystal structure of a compound.

[tex]BaCl_2.2H_2O\overset{400^o C}\rightarrow BaCl_2+2H_2O[/tex]

Hence, the sample of barium chloride crystals was hydrated.

Final answer:

The decrease in mass of barium chloride crystals after heating likely resulted from the loss of water of crystallization or the evaporation of volatile impurities.

Explanation:

The difference in mass of the barium chloride crystals before and after heating indicates that some part of the compound or its adherents has been lost during the heating process. Barium chloride itself is stable at high temperatures, but if it was hydrated barium chloride (BaCl2·xH2O), the heating could cause the water of crystallization to evaporate, which would result in a decrease in the mass.

Another possibility is that there might be impurities or other volatile substances in the crystalline material that could have evaporated or decomposed, resulting in less mass after the heating process.

Polyatomic ions contains more than two atoms with a net charge upon it. They are formed by covalent bonding between atoms. Hence option C is correct.

What is a polyatomic ion?

A polyatomic ion is cation or anion containing more than two atoms. Polyatomic ions containing a negative charges are anions whereas polyatomic ions with a net positive charge is called cations.

For example, ammonium ion NH₄⁺ is a polyatomic ion with a positive  charge called ammonium ion. It is formed by accepting a hydrogen from a source. This is called protonation.

Similarly, deprotonation of a polyatomic compound leads to the formation of negative charge in polyatomic ions. For example CO₃⁻ is formed by the deprotonation of  HCO₃.

Thus it is clear that polyatomic ions are covalent compounds such as ammonium, carbonate, nitrate ions etc. Thus option C is correct.

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Your question is incomplete. But most probably your complete question was the following:

Which statement is true about a polyatomic ion?

a. It is made up of a crystal lattice.

b. It contains a single atom

c. It is made of atoms that are covalently bonded together.

d. It contains multiple atoms with no charge.

Final answer:

A polyatomic ion is an ion composed of more than one atom bonded together that has a positive or negative charge. It can form ionic bonds with other ions to create ionic compounds.

Explanation:

A polyatomic ion is an ion composed of more than one atom bonded together. It has a positive or negative charge and can form ionic bonds with other ions to create ionic compounds.

For example, the nitrate ion (NO3) consists of one nitrogen atom and three oxygen atoms, and carries an overall charge of 1-. Another example is the carbonate ion (CO3), which consists of one carbon atom and three oxygen atoms and has an overall charge of 2-.

Polyatomic ions can be made up of atoms from the same element or different elements, and they have characteristic formulas, names, and charges that should be memorized.

The artifact was made approximately 1866 years ago.

To solve this problem, we can use the formula for exponential decay:

[tex]\[ N = N_0 \left( \frac{1}{2} \right)^\frac{t}{T_{1/2}} \][/tex]

Where:

- [tex]\( N \)[/tex] is the final amount of the substance (in this case, the remaining amount of carbon-14 in the artifact).

- [tex]\( N_0 \)[/tex] is the initial amount of the substance (in this case, the amount of carbon-14 in living trees).

- [tex]\( t \)[/tex] is the time that has passed (in years).

- [tex]\( T_{1/2} \)[/tex] is the half-life of the substance (in this case, 5730 years).

Given that the wooden artifact contains 80% of the carbon-14 present in living trees, we can set up the equation as follows:

[tex]\[ 0.80N_0 = N_0 \left( \frac{1}{2} \right)^\frac{t}{5730} \][/tex]

Now, we can solve for t, the time that has passed:

[tex]\[ \left( \frac{1}{2} \right)^\frac{t}{5730} = 0.80 \][/tex]

Taking the natural logarithm of both sides to isolate the exponent:

[tex]\[ \frac{t}{5730} \ln \left( \frac{1}{2} \right) = \ln(0.80) \][/tex]

[tex]\[ \frac{t}{5730} = \frac{\ln(0.80)}{\ln \left( \frac{1}{2} \right)} \][/tex]

[tex]\[ t = 5730 \times \frac{\ln(0.80)}{\ln \left( \frac{1}{2} \right)} \][/tex]

[tex]\[ t \approx 1865.896 \, \text{years} \][/tex]

Rounding to the nearest whole number, we get:

[tex]\[ t \approx 1866 \, \text{years} \][/tex]

Therefore, the artifact was made approximately 1866 years ago.

Option D: Calcium (Ca)

The atomic number of bromine is 35 thus, the electronic configuration will be:

[tex]Br:[Ar]3d^{10}4s^{2}4p^{5}[/tex]

Here, [Ar] defines electronic configuration of argon noble gas with stable electronic configuration and atomic number 18.

The energy level is defined by principal quantum number, n. Since, the valence electrons in bromine are in 4p thus, energy level will be 4 (principal quantum number).

Now, atomic number of barium is 56 and its electronic configuration is as follows:

[tex]Ba:[Xe]6s^{2}[/tex]

Here, [Xe] defines electronic configuration of xenon noble gas with stable electronic configuration and atomic number 54. The valence electronic shell is [tex]6s^{2}[/tex] thus, number of valence electrons are 2.

A. Potassium (K): Atomic number is 19 thus, electronic configuration will be:

[tex]K:[Ar]4s^{1}[/tex]

Here, [Ar] defines electronic configuration of argon noble gas with stable electronic configuration and atomic number 18.

Now, the energy level is same as that of Br but valence electron is 1 which is not equal to that of Ba.

Thus, this is incorrect option.

B. Beryllium (Be): Atomic number is 4 thus, electronic configuration will be:

[tex]Be:[He]2s^{2}[/tex]

Here, [He] defines electronic configuration of helium noble gas with stable electronic configuration and atomic number 4.

Now, the number of valence electrons are same as that of Ba but the energy level is not same as that of Br.

Thus, this is incorrect option.

C. Cadmium (Cd): Atomic number is 48 thus, electronic configuration will be:

[tex]Cd:[Kr]4d^{10}5s^{2}[/tex]

Here, [Kr] defines electronic configuration of krypton noble gas with stable electronic configuration and atomic number 36.

Now, the number of valence electrons are same as that of Ba but the energy level is not same as that of Br.

Thus, this is incorrect option.

D. Calcium (Ca): Atomic number is 20 thus, electronic configuration will be:

[tex]Ca:[Ar]4s^{2}[/tex]

Here, [Ar] defines electronic configuration of argon noble gas with stable electronic configuration and atomic number 18.

Now, it has energy level same as that of Br and number of valence electron is also same as that of Ba thus, it is correct option.

Therefore, calcium (Ca) is the correct element.

Physical Because changing phases such as solid, liquid, gas are physical forms.

Answer:

The complete and balance the equation for this reaction in acidic solution is given by:

[tex]Cr+4H_2O+6Ag^+\rightarrow CrO_4^{2-}+8H^++6Ag[/tex]

Explanation:

Oxidation reaction of chromium to chromate in acidic medium:

[tex]Cr\rightarrow CrO_4^{2-}[/tex]

Add 4 molecules of water on the left hand side to balance the oxygen:

[tex]Cr+4H_2O\rightarrow CrO_4^{2-}[/tex]

Now balance hydrogen atoms by adding hydrogen ions on opposite to the side where water molecule are present .

[tex]Cr+4H_2O\rightarrow CrO_4^{2-}+8H^+6e^-[/tex]....[1]

In last, to balance the charge on the both sides add electrons to sides where positive charge is more.

Reduction reaction of silver ions to silver in acidic medium:

[tex]Ag^++e^-\rightarrow Ag[/tex]..[2]

By [1] + 6 × [2] , we will get the balance equation for this reaction in acidic solution:

[tex]Cr+4H_2O+6Ag^++6e^-\rightarrow CrO_4^{2-}+8H^+6e^-+6Ag[/tex]

[tex]Cr+4H_2O+6Ag^+\rightarrow CrO_4^{2-}+8H^++6Ag[/tex]

Answer:

4pz and 4py

Explanation:

The electron configuration of Kr is:

[Ar] 3d¹⁰ 4s² 4p⁶

4p has 3 subatomic orbitals: 4px, 4py and 4pz

As there are a total of 6 electrons each of the three 4p orbitals have two electrons with opposite spins. Hence 4py and 4pz have equal energy. Option D is correct.  

Option A, 1s and 2s is incorrect, as the energy of the 1st orbital is lower than that of the 2nd orbital.  

Option B, 2s and 2p is incorrect, as the energy of the s suborbital is lower than that of the p, even though they both belong to the same orbital.  

Option C, 3px and 4px is incorrect, as the energy of the 3rd orbital is lower than that of the 4th orbital.  

Answer:

C.) balance in number of electrons and protons.

Explanation:

Its the right answer i swear!!!

Answer:

[tex]\frac{P_1*V_1}{T_1}=\frac{P_2*V_2}{T_2}[/tex]

Explanation:

The combined gas law is the combination of three different laws applied to gases:

Gay-Lussac's Law:

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

Boyle-Mariotte's Law:

[tex]P_1*V_1=P_2*V_2}[/tex]

Charles's Law:

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

The result of the combination is:

[tex]\frac{P_1*V_1}{T_1}=\frac{P_2*V_2}{T_2}[/tex]

In the Periodic Table, a set of properties repeats from group to group, not element to element, column to column, or row to row. This is because elements in the same group have the same number of valence electrons.

In the context of the Periodic Table, a set of properties repeats not from element to element, or column to column, or row to row, but actually from group to group. This is because elements in the same group or column of the periodic table have the same number of electrons in their outer orbitals (Valence Electrons). This concept is known as periodicity. For instance, all elements in Group 1 (alkali metals) are very reactive metals because they each have one electron in their outermost shell.

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