In the reaction Mg(s) + 2H2O(l) Mg(OH)2(s) + H2(g), what is the oxidation state of each H in H2(g)?


A. 0
B. +2 and –2
C. +1
D. –1 and +1

Answer:

the first step is distillation

Explanation:

In order to buffer a strong acid into a weak acid, salt of strong acid should be used as the buffer.

Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds such as  HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.

According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic  acids  depending on the number of protons which are liberated on dissociation.

Acids are widely used in industries  for  production of fertilizers, detergents  batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.

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Answer : The correct answer is, (C) 930000

Explanation :

Scientific notation : It is the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.

For example :

5000 is written as [tex]5.0\times 10^3[/tex]

889.9 is written as [tex]8.899\times 10^{-2}[/tex]

In this examples, 5000 and 889.9 are written in the standard notation and [tex]5.0\times 10^3[/tex]  and [tex]8.899\times 10^{-2}[/tex]  are written in the scientific notation.

[tex]8.89\times 10^{-2}[/tex]  this is written in the scientific notation and the standard notation of this number will be, 0.00889.

If the decimal is shifting to right side, the power of 10 is negative and if the decimal is shifting to left side, the power of 10 is positive.

As we are given the [tex]9.3\times 10^5[/tex] in scientific notation.

Now converting this into standard notation, we get:

[tex]\Rightarrow 9.3\times 10^5=930000[/tex]

Hence, the correct answer is, (C) 930000

Calcium chloride (CaCl2) is a salt which dissociates when dissolved in water. Assuming that the dissociation is complete (100 %), then the half reaction for this would be:

CaCl2 ---> Ca2+  +  2 Cl-

We can see that in 1 mole of CaCl2 salt, 1 mole of Ca2+ ion and 2 moles of Cl- ion is created. Therefore there are 3 moles of ion per 1 mole of CaCl2. Using this ratio, the total number of moles of ions in the solution is:

Total number of ions = 0.5 mol CaCl2 * (3 moles ion / 1 mol CaCl2)

Total number of ions = 1.5 moles ion

Answer:

1.5 mol ions

Explanation:

The percent yield of a reaction is used to measure the efficiency of a given chemical reaction. It signifies how effectively the reactants have been converted to products. It does not directly indicate the number of reactants, products, or the limiting reactant.

The purpose of finding the percent yield of a chemical reaction is primarily to determine the efficiency of the reaction. The term 'percent yield' represents the ratio of the actual yield (the amount of product actually generated in a reaction) to the theoretical yield (the maximum amount of product that could potentially be generated) multiplied by 100.

It does not directly allow us to determine the number of reactants or products, nor the limiting reactant of the reaction; its purpose rather is to assess how effectively the reactants have been converted into products. A high percent yield, close to 100%, means that the reaction was very efficient with little waste or side reactions taking place.

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Answer:

6

Explanation:

The given electron configuration 1s² 2s² 2p⁶ 3s² 3p⁴.

The valence shell of an atom is the outermost orbit. Here the valence shell is 3 with electrons occupying the  s and p orbitals.

The s orbital has 2 electrons and the 3p orbital has 6 electrons. So adding all the electrons in the 3s and 3p orbital we have a total of 6 electrons in the 3rd valence shell.

The number of valence electron in the element is 6 electrons

Valence electron(s) are the electrons located on the outermost shell of an atom.

From the question given above, we obtained:

Electronic configuration => 1s² 2s²2p⁶ 3s²3p⁴

Total electron in valence shell = 2 + 4

Therefore, the number of valence electron in the element is 6 electrons.

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3.45= 3,450,000,000 Im working on this at school rn I hope I helped

The correct pH of a 0.00598 M [tex]HClO_4[/tex] solution is approximately 2.223.

To determine the pH of a 0.00598 M [tex]HClO_4[/tex] solution, we can use the fact that [tex]HClO_4[/tex] is a strong acid and dissociates completely in water. Therefore, the concentration of H+ ions in the solution will be equal to the concentration of the acid.

Given that the concentration of [tex]HClO_4[/tex] is 0.00598 M, the concentration of H+ ions will also be 0.00598 M. The pH of a solution is defined as the negative logarithm (base 10) of the [tex]H^+[/tex] ion concentration:

[tex]\[ \text{pH} = -\log[H^+] \][/tex]

Substituting the concentration of H+ ions into the equation, we get:

[tex]\[ \text{pH} = -\log(0.00598) \][/tex]

Using a calculator to find the logarithm and then the negative of that value, we obtain:

[tex]\[ \text{pH} \approx 2.223 \][/tex]

This is the most accurate value among the given options, and it corresponds to the pH of the solution. The other options (1.777, 6.434, 7.566, and 3.558) do not accurately represent the pH of a 0.00598 M [tex]HClO_4[/tex] solution.

The Kinetic Molecular Theory suggests that as the volume of an enclosed gas increases, the number of particle impacts per unit area decreases since the gas particles are more spread out.

According to the Kinetic Molecular Theory, as the volume of an enclosed gas increases, the number of particle impacts per unit area decreases. The Kinetic Molecular Theory, a fundamental concept in gas physics, postulates that gas particles are in constant, random motion and that they frequently collide with each other and the walls of their container. When the volume of the container increases, the gas particles have more space to move around, the number of possible collision points increase but relatively the collisions with specific unit area decreases as the particles are more spread out. So the number of particle impacts per unit area decreases, not increases. The total number of particle impacts or the temperature does not necessarily have to change.

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Methanol is soluble in water because it can form hydrogen bonds with water molecules. Methane is not able to form hydrogen bond in water and it exists in gas phase.

Methanol is an organic compound classified as an alcohol. Its formula is CH₃OH. Methanol is usually used in beverages as common alcohol and it is toxic and injurious to health.

Methanol is polar in nature and polar compounds easily dissolves in polar solvents such as water. The OH group in methanol bonds with H+ ends in water and this string hydrogen bond make it soluble in water.

Methane on  the other hand is an organic gas, which does not have free H+ OH- groups to form hydrogen bonds with water and likely be insoluble in water.

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the molar solubility of Barium Sulfate is 1.05 × 10⁻⁵ mol/L.

The correct option is (b).

The solubility product (Ksp) for Barium Sulfate (BaSO₄) is given as 1.1 × 10⁻¹⁰. The solubility product is the equilibrium constant representing the relationship between the concentrations of the ions in the saturated solution:

BaSO₄(s) ⇌ Ba²⁺(aq) + SO₄²⁻(aq)

To calculate the molar solubility (S) for BaSO₄, we need to find the concentration of Ba²⁺ and SO₄²⁻ ions at equilibrium. Since Ksp is given, we can use the definition of the solubility product:

Ksp = [Ba²⁺] × [SO₄²⁻]²

We don't have the individual ion concentrations but can find the total molar solubility (Sₙ) by taking the square root of the solubility product:

Sₙ = √(Ksp) = √(1.1 × 10⁻¹⁰) = 1.05 × 10⁻⁵ mol/L

So, the molar solubility of Barium Sulfate is 1.05 × 10⁻⁵ mol/L.

complete question given below:

The solubility product for barium sulfate is 1.1*10⁻¹⁰. Calculate the molar solubility of barium sulfate.

1) 5.5*10⁻⁸ mol/L

2) 1.05 *10⁻⁵ mol/L

3) 2.1*10⁻⁵ mol/L

4) 1.1*10⁻¹⁰ mol/L

5) 2.2*10⁻¹⁰ mol/L

To calculate the mass, go from atoms to moles and moles to grams:

Atoms ........ Moles.......... Grams

From atoms to moles, use the Avogadro’s no. which is 6.022 x 10^23 and from moles to grams use atomic mass of Pt that is 195.08g.

So, 4.91 x 10^21 Pt atoms x (1 mole Pt / 6.022x10^23 Pt atoms) x (195.08g Pt / 1 mole Pt) = 1.59g Pt

Mass of 4.91 x 10^21 Pt atoms = 1.59g Pt

The mass of [tex]4.91 \times {10^{21}}{\text{ platinum atoms}}[/tex] is [tex]\boxed{1.59{\text{ g}}}[/tex].

Further Explanation:

We are provided with atoms of platinum and its mass is to be calculated. For this, first of all atoms of Pt are to be converted into moles. This is done with the help of Avogadro’s law. According to Avogadro’s law, one mole of any substance contains [tex]6.022 \times {10^{23}}{\text{ units}}[/tex]. Such units can be atoms and molecules.

Since [tex]6.022 \times {10^{23}}[/tex] of platinum consist of one mole, number of moles that are present in [tex]4.91 \times {10^{21}}{\text{ atoms}}[/tex] can be calculated as follows:

 [tex]\begin{aligned}{\text{Moles of Pt}} &= \left( {4.91 \times {{10}^{21}}{\text{ atoms}}} \right)\left( {\frac{{1{\text{ mol}}}}{{6.022 \times {{10}^{23}}{\text{ atoms}}}}} \right) \\&= 0.008153{\text{ mol}} \\\end{aligned}[/tex]

Now moles calculated in above step are used to proceed for further calculations of mass. Moles and mass of Pt are related to each other with the help of expression written below.

The formula to calculate moles of Pt is as follows:

[tex]{\text{Moles of Pt}} = \dfrac{{{\text{Mass of Pt}}}}{{{\text{Molar mass of Pt}}}}[/tex]                                                                    ……(1)

Rearrange equation (1) to calculate mass of Pt.

[tex]{\text{Mass of Pt}} = \left( {{\text{Moles of Pt}}} \right)\left( {{\text{Molar mass of Pt}}} \right)[/tex]                                            …… (2)

The moles of Pt are0.008153 mol.

The molar mass of Pt is 195.084 g/mol.

Substitute these values in equation (2).

[tex]\begin{aligned}{\text{Mass of Pt}} &= \left( {{\text{0}}{\text{.008153 mol}}} \right)\left( {{\text{195}}{\text{.084 g/mol}}} \right)\\&= 1.59{\text{ g}} \\\end{aligned}[/tex]  

Hence,mass of platinum comes out to be 1.59 g.

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Mole concept

Keywords: mole, atoms, Pt, platinum, moles of Pt, molar mass of Pt, 1.59 g, Avogadro’s law, 6.022*10^23 atoms, 4.91*10^21 atoms, mass of Pt, 195.084 g/mol, 0.008153 mol, mass of platinum.

Answer : The coefficient used for the oxygen in balanced chemical reaction is, 3.

Explanation :

Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.

When methanol is burned in air then it react to give carbon dioxide and water as a products.

The balanced chemical reaction will be,

[tex]2CH_3OH(l)+3O_2(g)\rightarrow 2CO_2(s)+4H_2O(g)[/tex]

This reaction is a combustion reaction in which a hydrocarbon react with oxygen to given carbon dioxide and water as a products.

By stoichiometry we can say that, 2 mole of methanol react with 3 moles of oxygen to give 2 moles of carbon dioxide and 4 moles of water.

Hence, from the balanced chemical reaction we conclude that the coefficient used for the oxygen is 3.

The balanced equation is:

Combustion is a reaction of a substance with oxygen with the release of heat and light.

In the combustion of methanol, carbon(iv) oxide and water are produced.

The balanced equation is:

2 CH3OH + 3 O2 -----> 2 H2O + 2 CO2

Based on the balanced equation, the coefficient of oxygen is 3.

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The atomic or hybrid orbitals that make up the sigma bond between C1 and C2 in tetrafluoroethylene, C2F4 are the sp2 hybrid orbitals. Tetrafluoroethylene C2F4 has double bond between C1 and C2. So, sigma bond is made sp2hybrid orbitals.

To add, the simplest perfluorinated alkene, Tetrafluoroethylene belongs to the family of fluorocarbons.

Answer:

hybrid sp2 -orbital make up the sigma bond between C1 and C2 in tetrafluoroethylene

Explanation:

The tetrafluoroethylene has a double bond between the carbons and single bonds between each fluor and carbon because each carbon requires a full octet and each fluor requires a pair of electrons.

In chemistry, hybridization is the interaction of atomic orbitals within an atom to form new hybrid orbitals. In sp2 hybridization, an s orbital and two orbitals are combined p. For this hybridization to occur, the carbon must be attached to three atoms as is the case in the carbon atom in this case. On the other hand, the sigma bond (σ) is formed when there is a front overlap of atomic orbitals; and the pi (π) bond is formed when there is superposition of parallel p orbitals.

Atoms that form sp2 hybridizations can form compounds with double bonds, as in this case between both carbons. Simple bonds are known as sigma bons (σ) and double bonds are composed of a sigma bond and a pi bond. So double bond between sp2 hybrid orbitals formed by one sigma-bond and one pi-bond.

In summary, hybrid sp2-orbital make up the sigma bond between C1 and C2 in tetrafluoroethylene

Temperature does not change during melting because the heat absorbed is used to overcome intermolecular forces rather than to increase the kinetic energy of the particles.

As long as both ice and water are present in the beaker, the temperature of the water will not increase.

The freezing point of water is 0°C (273 K).

The water's temperature should be 0°C (273 K).

When carrying out the experiment of putting three ice cubes in a beaker and letting them partially melt, the student will observe that when measuring the temperature, it will not change during the melting of the ice.

It corresponds to the water cycle in nature, that is, the processes of water transformation, through:

Therefore, there are two laws that determine fusion, which are related to a pure and crystalline substance under a certain pressure will not change its temperature and will remain constant.

This is because the heat absorbed is not used to increase the kinetic energy of the particles, but to overcome the forces of interaction between the molecules.

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