Report your answer with the proper number of significant figures. magnesium is used in lightweight alloys for airplane bodies and other structures. the metal is obtained from seawater in a process that includes precipitation, neutralization, evaporation, and electrolysis. how many kilograms of magnesium can be obtained from 8.01 km3 of seawater if the initial mg2+concentration is 0.12% by mass? (d of seawater = 1.04 g/ml)

Answer : The ions present in the solution of [tex]K_2CO_3[/tex] are [tex]K^+[/tex] and [tex]CO^{2-}_3[/tex] in aqueous state.

Explanation :

When [tex]K_2CO_3[/tex] is in aqueous solution then they dissociates into their ions.

The reaction in aqueous medium is,

[tex]K_2CO_3(aq)\rightarrow 2K^+(aq)+CO^{2-}_3(aq)[/tex]

The charge on potassium ion is +1 and on carbonate ion is -2. To neutralize the charge on carbonate ion, two potassium ion must be used.

Therefore, the ions present in solution of [tex]K_2CO_3[/tex] are [tex]K^+[/tex] and [tex]CO^{2-}_3[tex] in aqueous state.

[tex]\boxed{{{\text{K}}^ + },\;{\text{CO}}_3^{2 - }}[/tex] are the ions present in the solution of [tex]{{\text{K}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}[/tex] . Both ions are in the aqueous phase.

Further Explanation:

Chemical bond:

The attraction between atoms, molecules or ions which results in the formation of chemical compounds is known as a chemical bond. It is formed either due to electrostatic forces or by the sharing of electrons. There are many strong bonds such as ionic bonds, covalent bonds, and metallic bonds while some weak bonds like dipole-dipole interactions, London dispersion forces, and hydrogen bonding.

Ionic compound:

Ionic compounds are the compounds that are formed from the ions of the respective species. Ions are the species that are formed either due to loss or gain of electrons. A neutral atom forms cation by the loss of electrons and anion by the gain of electrons.

Following are some of the properties of ionic compounds:

1. These are hard solids.

2. High melting and boiling points.

3. Good conductors of heat and electricity.

4. High enthalpy of fusion.

For example, [tex]{\text{MgC}}{{\text{l}}_2}[/tex] is an ionic compound formed from one [tex]{\text{M}}{{\text{g}}^{2 + }}[/tex] and two [tex]{\text{C}}{{\text{l}}^ - }[/tex] ions. Its dissociation occurs as follows:

[tex]{\text{MgC}}{{\text{l}}_2}\rightleftharpoons {\text{M}}{{\text{g}}^{2+}}+{\text{2C}}{{\text{l}}^ - }[/tex]

[tex]{{\mathbf{K}}_{\mathbf{2}}}{\mathbf{C}}{{\mathbf{O}}_{\mathbf{3}}}[/tex]  is an ionic compound that consists of two [tex]{{\mathbf{K}}^{\mathbf{ + }}}[/tex] ions and one [tex]{\mathbf{CO}}_{\mathbf{3}}^{{\mathbf{2 - }}}[/tex] ion. Therefore it dissociates to form two [tex]{{\text{K}}^ + }[/tex] ions and one  [tex]{\text{CO}}_3^{2 - }[/tex] ion. The reaction for dissociation of  [tex]{{\mathbf{K}}_{\mathbf{2}}}{\mathbf{C}}{{\mathbf{O}}_{\mathbf{3}}}[/tex] is,

[tex]{{\text{K}}_2}{\text{C}}{{\text{O}}_3}\left({aq}\right)\to2{{\text{K}}^ + }\left( {aq} \right)+{\text{CO}}_3^{2 - }\left({aq}\right)[/tex]

So the ions present in [tex]{{\text{K}}_2}{\text{C}}{{\text{O}}_3}[/tex] solution are two [tex]{{\text{K}}^ + }[/tex] and one [tex]{\text{CO}}_3^{2 - }[/tex] ions. Both the ions are present in the aqueous phase.

Learn more:

1. Identification of ionic bonding: https://brainly.com/question/1603987

2. Oxidation and reduction reaction: https://brainly.com/question/2973661

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic and covalent compounds

Keywords: K2CO3, K+, CO32-, ionic compound, ions, one, two, dissociation, reaction, ions, cation, anion, electrons, chemical bond, attraction, properties, aqueous phase.

The conversion of 200 mol of water to kilograms of water is needed to calculate the molality of 10 mol of NaCl in 200 mol of water. Thus, the correct option is A.

Molality is the measure of concentration of a solution. It is the number of moles of solute which are present in a solution that is corresponding to about 1 kg or 1000 g of solvent solution. This amount contrasts with the definition of molarity which is based on the volume of solution. A commonly used unit for molality in chemistry is mol/kg of the solvent molecule.

The formula for calculation of Molality is:

m = mol/ kg

where, m = molality of solution,

mol = number of moles of solute,

kg = kilogram of solvent

The conversion of 200 mol of water to kilograms of water is necessary for the calculation of molality of the solution.

Here, Solute (mol) = 10 mol NaCl

Solvent (Kg) = 200 mol water (Convert to kilograms of water).

Therefore, the correct option is A.

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Your question is incomplete, most probably the complete question is:

What would you need to do to calculate the molality of 10 mol of NaCl in 200

mol of water?

A. Convert the 200 mol of water to kilograms of water.

B. Convert the 200 mol of water to liters of water.

C. Convert the 10 mol of NaCl to grams of NaCl.

D. Convert the 10 mol of NaCl to kilograms of NaCl.

Answer:

student 4 for jlabs

Explanation:

Answer:

To get a better understanding of all materials we come on contact with and how they affect and help us !

Explanation:

Answer:

Chemical change

Compounds

Number of atoms of hydrogen on both side=6

Number of atoms of nitrogen on both sides=2

Number of atoms of nitrogen and hydrogen on both  sides are equal.

Explanation:

We are given that a reaction

[tex]N_2+3H_2\rightarrow 2NH_3[/tex]

It is chemical change because there is chemical reaction occurring .In physical change, no chemical reaction takes place.

It involved compound because compound  consist of two or more than two  atoms of same or different  elements . In compound , the atoms are bonded together by chemical bond.

Nitrogen is a compound because two nitrogen atoms are bonded together to form a molecule of nitrogen.Similarly , in hydrogen molecules, two hydrogen  atom are bonded together to form one hydrogen molecule.

In ammonia, 3 hydrogen and 1 nitrogen atom are bonded together to form ammonia.

On LHS

Number of atoms of hydrogen=6

Number of nitrogen atoms=2

On RHS

Number of atoms of Hydrogen=6

Number of nitrogen atoms=2

Number of atoms of every element in reactants equals to number of atoms of every element in product.

Final answer:

The pressure of a gas at standard temperature and pressure (STP) is typically stated as 1 atm (101.325 kPa), although the IUPAC defines it as 100 kPa. STP is used to consistently compare properties of gases and the standard molar volume of an ideal gas at these conditions is about 22.4 L.

Explanation:

The pressure of a gas at standard temperature and pressure (STP) is defined as 1 atmosphere (atm). However, it's important to note that there are different definitions of STP. The most commonly used definition for STP is a temperature of 0°C (273.15 K) and a pressure of 1 atm (101.325 kPa).

But, according to the International Union of Pure and Applied Chemistry (IUPAC), STP is defined as a temperature of 0°C (273.15 K) and a pressure of 100 kPa (0.986 atm).

For simplicity and to stay consistent with older conventions, 1 atm is often still used as the standard pressure when discussing STP in many contexts.

Answer:

The answer is Silver.

Explanation:

The complete question is:

"Which element is placed in the same period as ruthenium but has a higher atomic number than it? bismuth osmium silver zirconium"

In the periodic table the elements are arranged so that those with similar chemical properties are located close to each other.

The horizontal rows of the periodic table are called periods. The elements that make up the same row have different properties but similar masses: all the elements of a period have the same number of orbitals. In other words, the period that an element occupies coincides with its last electronic layer. In other words, an element with five electronic layers will be in the fifth period.

The atomic number is represented by the letter Z and is the number of protons that have their atoms in the nucleus. The atomic number of silver [47] is higher than that of ruthenium [44] because silver has higher number of protons more than ruthenium. Ruthenium and silver are in the same period and they have the same number of atomic orbital but have different atomic numbers.

So the answer is Silver.

The electrical charge of the calcium ion is +2.

If an atom of calcium loses two electrons, the charge that will be occupied on an ion of calcium is +2. Thus, the correct option for this question is D.

Electrons may be defined as the type of sub-atomic particles that are consistently revolving around the nucleus of an atom. These sub-atomic particles are negatively charged in nature. The discovery of electrons is known to be done by J.J. Thomson.

It is the phenomenon that when an atom loses its electrons, it will definitely occupy the positive charge on its atom.

While when an atom gains electrons from another atom, it will occupy the negative charge on its atom.

In the above example, an atom of calcium loses two electrons, so it will occupy the charge of +2 on its atom.

Therefore, if an atom of calcium loses two electrons, the charge that will be occupied on an ion of calcium is +2. Thus, the correct option for this question is D.

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Final answer:

The density of the substance is 1.70 g/mL.

Explanation:

The density of a substance can be calculated using the formula:

Density = Mass/Volume

In this case, the mass is given as 45.00 g and the volume is given as 26.5 mL. We can use these values to calculate the density:

Density = 45.00 g / 26.5 mL

Density = 1.70 g/mL

Therefore, the density of the substance is 1.70 g/mL.

Answer:

25°C and 1 M reactants

Explanation:

The standard conditions to measure the reduction potential as standard electrode potential is 298.15 K temperature (25°C) and 1 mol / L concentration of each reactant.

The pressure should be 1 atm for gaseous reactants (like in case of Standard hydrogen electrode where pressure of hydrogen gas is taken to be 1 atm).

Answer: A.) are reasonable and testable

A hypothesis can be defined as the supposition or assumption of scientific process that is based on limited scientific evidences and used as a starting point for further investigation. The hypothesis needs to be proved by following relevant scientific methodology.

In the given situation, both the hypothesis are correct because both warm temperature and sunlight are genuinely responsible for wilting of plant in nature. The effect of both sunlight and warm temperature can be tested separately on plant. This proves that the hypothesis are reasonable and testable.

Answer:

B

Explanation:

Answer: The correct answer is Option A.

Explanation:

Electronegativity is defined as the tendency of an atom to attract the shared pair of electrons towards itself whenever a bond is formed.

This property increases as we move from left to right across a period because the number of charge on the nucleus gets increased and electrons are attracted more towards the nucleus.

This property decreases as we move from top to bottom in a group because the electrons get add up in the new shells which make them further away from the nucleus.

Thus, the correct answer is Option A.

Final answer:

When ammonium sulfide ((NH4)2S) dissolves in water, it dissociates fully into two ammonium ions (NH4+) and one sulfide ion (S2-), showcasing its behavior as a strong electrolyte.

Explanation:

The question relates to ammonium sulfide, a strong electrolyte, dissolving in water. When ammonium sulfide ((NH4)2S) is put into water, it dissociates into its ions because it is a strong electrolyte. Hence, the reaction is as follows:

(NH4)2S(s) + H2O(l) → 2NH4+(aq) + S2-(aq)

This reaction clearly shows ammonium ions (NH4+) and sulfide ions (S2-) being released into the solution. Two ammonium ions are needed to balance the charge on a single sulfide ion, reflecting the original stoichiometry of ammonium sulfide.

Answer:

There are 1.44 x 10^23 atoms of oxigen in 6.90 grs of Al2(SO4)3.

Explanation:

To solve this problem you have to find:

1) The molecular mass of Al2(SO4)3;

2) Estimates the percentage of oxigen and express it in terms of its moles.

3) Calculate the number of atoms using Avogadro´s Number.

1) Molecular mass Al2(SO4)3= 2x26,98 + 3x31.06 + 12x16 =339.14 grs/mol.

2) If in the molecular mass of the compound there are 192 grs/mol (12x16) of oxigen, in 6.90 g will be:

192 grs/mol Oxigen ------------- 339.14 grs/mol Al2(SO4)3

x= 3.90 grs/mol--------------------  6.90 grs/mol  Al2(SO4)3

Then if one mol of oxigen has a mass of 16 grs, 3.90 grs represents....

1 mol oxigen ------------- 16 grs of oxigen

x= 0.24 moles------------ 3.90 grs of oxigen

3) There are 6,022 x 10^23 (Avogrado´s number) atoms of oxigen in a mol of oxigen, so in 0.24 moles will be

1 mol oxigen ---------------- 6,022 x 10^23 atoms of oxigen

0.24 moles oxigen ------- x = 1.44 x 10^23 atoms of oxigen.

Summarizing there are 1.44 x 10^23 atoms of oxigen in 6.90 grs of Al2(SO4)3.

For this case what you should do is keep in mind the following conversions:

[tex] 1 milliliter = 1 cm ^ 3 [/tex]

[tex] 1000 milliliters = 1 L [/tex]

Therefore, by applying the conversions we have:

For cubic centimeters:

[tex] (10,300mL) (1\frac{cm^3}{mL}) = 10,300cm ^ 3 [/tex]

For liters:

[tex] (10,300mL) (\frac{1}{1000}\frac{L}{mL}) = 10.3 L [/tex]

Answer:

10,300 milliliters is the same as:

[tex]10,300cm ^ 3[/tex]

[tex]10.3 L[/tex]

Answer:

Plastics are synthetic organic compounds

Explanation:

The atomic mass of an element is calculated by taking the weighted average of the mass numbers of all its naturally occurring isotopes, calculated by the sum of the protons and neutrons in an atom.

The atomic mass of an element is primarily the total mass of its protons and neutrons. Electrons have a negligible mass and thus are not typically included in the atomic mass calculation. To calculate the atomic mass of an element, you first need to know its mass number, which is the sum of the number of protons and neutrons.

The number of protons is the element's atomic number, and it defines the type of element. For example, carbon (C) has an atomic number of 6, hence it has 6 protons. Carbon's most common isotope has 6 neutrons, therefore, its mass number is 12.

However, because elements can have multiple isotopes with different numbers of neutrons, the atomic mass listed on the periodic table is a weighted average of the mass numbers of all the naturally occurring isotopes of an element. For instance, chlorine (Cl) has an atomic mass of 35.45 because it mainly exists as isotopes with mass numbers of 35 (17 protons and 18 neutrons) and 37 (17 protons and 20 neutrons).

Final answer:

The existence of discrete energy levels in an atom can be inferred from the characteristic emission and absorption spectra unique to each element, which result from the quantized energy levels of electrons.

Explanation:

The existence of discrete (quantized) energy levels in an atom may be inferred from the emission and absorption spectra that have been known for over a century to be discrete or quantized. These spectra are unique to each element and are due to the quantized energy levels of electrons in atoms. When an electron jumps from one energy level to another, it must absorb or emit a photon with energy equal to the difference between these two energy levels; this creates specific lines in an atom's spectra. This phenomenon confirmed the idea that electrons occupy discrete orbits around the nucleus, a concept that is foundational for quantum mechanics and was part of what led to Bohr's Nobel Prize-winning work.

In the modern quantum mechanical theory of the atom, electron movement is thought to be a

So, option D is correct one.

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