TRUE/FALSE. sn2 mechanism for nucleophilic substitution reactions involves one step and occurs with inversion of configuration.

Answer:

transition metals

Explanation:

It is shown in the periodic table. It has an atomic number of 24 and exhibits characters which makes it to be a transition element.

To solve the given problems, there are some rules for naming these compounds in coordination chemistry.

Some other rules for writing formula-

Now, as per the given questions we can write the formulas-

a) [tex]K_{3}[Cr(C_{2}O_{4})_{3}][/tex]

b) [tex][Co(en)_{3}]_{4} [Mn(CN)_{5}I]_{3}[/tex]

c) [tex][Al(H_{2}O) _{2}(NH_{3}) _{2}BrCl]NO_{3}[/tex]

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The Lewis structures of HCN and the carbonate ion are shown in the images attached.

We know that the term Lewis structure has to do with the representation of the compound in which we have the symbol that depicts each and every one of the elements in the compound and then we have the electrons that are found in the central atom shown as dots.

In this case, we have been asked to show the Lewis structures of the hydrogen cyanide and the carbonate ion and these can be seen in the images that have been attached to this answer here.

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The molar mass of C₇H₁₆ and the molar mass of CaCO₃ contain approximately the same number of grams per mol (g/mol).

The mass of a specific chemical ingredient or chemical agent (g) multiplied by the quantity of stuff is known as the molar mass (mol). By multiplying the standard atomic weights (in g/mol) of component atoms, one can identify the molar density of a compound.

The molar mass of an active ingredient is determined by dividing its mass by the quantity of that compound, expressed as the number of molecules in the sample, quantified in moles. The molar mass of a solid is a bulk attribute rather than a molecular one.

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Each iron tablet contains 152 g of iron.

The substance listed here is iron sulfate, and its chemical formula is FeSO4.

The compound's relative formula mass is calculated by multiplying the atomic masses of its constituent parts, and it is then given in grams.

The atomic mass of Fe = 55.845

The atomic mass of  S = 32.065

The atomic mass of   O = 15.994

So;

Relative formula mass is calculated as 55.845 + 32.065 + 4(15.994)  = 151.886g

Therefore, the solution is 152g

A particle's or object's mass, a dimensionless quantity, is used to represent how much matter is there (symbolized m).  The kilogram is the chosen unit of mass according to the International System (SI) (kg).

In physics, mass is a way to quantify inertia, a fundamental property of all matter.

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The molarity of the solution is  0.0597 M.

We know that the molarity has to do with the number of moles of the substances that is found in a  given volume of solution. Thus the term molarity has to do with the amount of substance that is present.

We have that;

Mass of the sodium chloride = 2.26g

Molar mass of the sodium chloride = 40 g/mol

Volume of the solution = 0.946 L

Number of moles = 2.26g/ 40 g/mol

= 0.0565 moles

Molarity = 0.0565 moles/0.946 L

= 0.0597 M

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Chlorine and hydrogen will form covalent bond.

What is covalent bond?

An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or shared pairs are the names given to these electron pairs. Covalent bonding is the stable equilibrium of the attractive forces between atoms when they share electrons. Each atom in many molecules can reach the equivalent of a complete valence shell thanks to the sharing of electrons, which results in a stable electronic configuration. Covalent bonds are much more frequent than ionic bonds in organic chemistry. Numerous other types of interactions fall under the category of covalent bonding, such as bent bonds, three-center two-electron bonds, agostic interactions, metal-to-metal bonds, and three-center four-electron bonds.

Chlorine and hydrogen Non-metals can connect covalently with one another.

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When considering solutions of liquids in liquids, polar liquids are generally miscible with water.

solution, in chemistry ,means  a homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of the solubility. The term solution is commonly applied to the liquid state of matter, but solutions of gases and solids are possible.

If the molecular compound is a liquid two things can happen when it comes into contact with water: it can either mix with the water or it can separate from the water. When two liquids mix they are said to be "miscible". When two liquids not not mix or if they separate they are said to be "immiscible". The answer is similar to the one for solids above: If the liquid molecules are polar like methanol rubbing alcohol, then it will be miscible with water. If the liquid molecules are nonpolar like oil, then the liquid will be immiscible with water.

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Answer: Water

Explanation: Water is the main ingredient in most shampoos. The second ingredient that most shampoos have in common is the primary surfactant (or base detergent). Surfactants are cleansing or surface active agents.

Five properties of metals are:

*Electric conductivity

*Heat conductivity

*Ductility and malleability

*Luster

*High melting and boiling points

Metal conducts electricity when the delocalized electrons allow electrons to move from one side of the metal to another transferring the electric charge. Items such as wood and rubber do not have delocalized electrons so electrical charges and that's why charge doesn't flow through them.

Metal conducts heat because when the delocalized electrons are heated they move faster. When the delocalized electrons move faster they move forward towards the colder end of the metal and transfer heat throughout the metal object.

Metal is ductile and malleable because of the ocean of electrons. Electrons move freely, they move as the positive metal ions move, which keeps metal stable.

Metal has luster because the ocean of electrons absorbs as well as reflects light at the same frequency. This makes the metal look shiny.

Metals acquire high melting and boiling points because of the ocean of electrons. The relation created by the positive and negative charges tends to the metals to hold in place, which gives metals high melting and boiling points.

Metals are opaque, lustrous elements that are accurate conductors of warmth and energy. maximum metals are malleable and ductile.

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Cleaning polluted waters is difficult and expensive.

What is water pollution?

Water contamination occurs when pollutants contaminate water source and render the water unfit for use in drinking, cooking, cleaning, swimming, and other activities. Germs, dust,and parasites are examples of pollutants.

Why is cleaning polluted water difficult?

Reversing the impacts of water contamination is exceedingly challenging. Even with costly technology, it can take years to completely purify the water because natural processes can take years, decades, or even centuries. Even though water is polluted, there are some ways to reduce pollution. They are

Hence, option A is correct.

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Answer is option B- Oxaloacetate/aspartate is an alpha-keto acid/alpha-amino acid pair used in transamination.

To create the amino acid version of the keto-acid and the keto-acid version of the original amino acid, amino groups are removed from amino acids and transferred to acceptor keto-acids by the process of transamination.

An amino group is transferred from one molecule to another during transamination. The formation of -ketoglutaric acid and aspartic acid from the interaction of glutamic acid and oxaloacetic acid serves as an example of this.

The reversible transfer of an amino group from glutamate to oxaloacetate, which results in the production of aspartate, is physiologically catalyzed by the enzyme AST. The enzyme was therefore previously known as serum glutamic-oxaloacetic transaminase.

Hence, Oxaloacetate/aspartate is an alpha-keto acid/alpha-amino acid pair used in transamination.

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Explanation: An acidic oxide is an oxide that either produces an acidic solution upon addition to water, or acts as an acceptor of hydroxide ions effectively functioning as a Lewis acid. Examples include SO2, CO2, SO3, Cl2O7, P2O5, and N2O5.

Answer:

An acidic oxide is an oxide that either produces an acidic solution upon addition to water, or acts as an acceptor of hydroxide ions effectively functioning as a Lewis acid.[1] Acidic oxides will typically have a low pKa and may be inorganic or organic.

Oxaloacetate concentration is maintained at exceedingly low levels.

What is a malate dehydrogenase?

Malate dehydrogenase (MDH) is a key protein in the main oxidative pathway and is a widely distributed enzyme in living things. Using NAD+ and NADP+ as a cofactor, it catalyses the conversion between malate as well as oxaloacetate. Malate dehydrogenase (MDH), a crucial enzyme inside the tricarboxylic acid cycle (TCA), performs crucial metabolic functions in the pathways that produce aerobic energy as well as in the malate shuttle.

The malate dehydrogenase reaction seems to have a strongly positive gibbs free energy change, but also because the density of oxaloacetate is kept at extremely low levels, it proceeds inside the direction of oxaloacetate.

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Area is defined as the total space taken up by a flat (2-D) surface or shape of an object.

Area = length x breadthArea = l × b. Area = π × radius × radiusArea = π × r2(π = 3.14) Using these formulas, area for different quadrilaterals

A = L x W    where A equals area, L equals length, and W equals width.

area of yard = 34 x 45 = 1530 square feet

walk is 4 feet wide

34-4 =30, 45-4 = 41

30*41=1230

1530-1230=300

area of walk is 300 square feet

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The central silicon atom expands the octet because it is bonded with 9 electrons, and the Lewis structure of SiF₅ reveals that there are 5 single bonds and no double bonds in the compound.

Fluoride in silicon pentoxide SiF₅ is a covalent compound created when silicon and fluorine share electrons. The 14th element, silicon, has four valence electrons. So, in order to reach octet, it needs 4 more electrons.

The 17th element, fluorine, has seven valence electrons. So, to reach an octet, one electron is required. Each F shares one of its valence electrons with silicon, giving silicon more electrons than an octet by receiving nine. Each of the five bonds is a single bond.

The charge on the main atom is created by the one extra pair of electrons. The compound thus does not follow the octet rule.

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Answer: Silicon tetrahydride (silane) is a covalent compound where a central silicon (Si) atom is covalently bonded to 4 terminal hydrogen (H) atoms.

Explanation:

There are 3 Au atoms are present in each unit cell.

The crystal structure of gold is face-centered cubic. Its unit cell or basic repeating unit, contains four gold atoms, indicating that the gold atoms are in contact along the diagonal. The crystal structure of gold is a close-packed face-centered cube Imagine a cube with a gold atom at each corner and at the center of each face.

Gold is a chemical element with 79 protons in each nucleus. All atoms with 79 protons are gold atoms, and all gold atoms behave similarly chemically. So, in principle, you only need 79 protons to make gold. A face-centered cubic unit cell also starts with identical particles at the eight corners of the cube.

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Answer:

creo que es el gas natural

Na has 8 valence electrons when forming an ionic bond with Cl, option A.

Chlorine (Cl) has seven valence electrons and Sodium (Na) has one. To form an octet, sodium must give up one electron and chlorine must gain one. Therefore, both sodium and chlorine ions have eight valence electrons and their outermost energy levels become completely depleted.

Bonds hold the negative and positive ions together. As a result, sodium chloride is formed (table salt). Also, to find valence electrons, a periodic table column can be used to determine an element's main group number.

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The atomic theories of Dalton and Democritus does converge in a common idea of the indivisibility of the atom.

We know that the atomic theory is the description of the atom from diverse perspectives. Actually, we begin the idea of the atomic theory from the would of Democritus. In the time of Democritus, there were no empirica laboratories hence, he had to make do with the theoretical approaches to the idea of the atom. He put forward the idea of the indivisibility of the atom.

This idea of the indivisibility of the atom became a resonating theme in the study of the atom from the time of Democritus down to the time of John Dalton. According to the Dalton Atomic theory, the atom is indivisible and the atoms of an element can be able to combine with the atoms of other elements in small simple ratios.

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The products of the acid hydrolysis of ester are carboxylic acid and alcohol.

Acid hydrolysis of esters involves heating esters in a large excess of water in the presence of a strong acid catalyst. The products of such reactions are carboxylic acid and alcohol as shown in the below example.

[tex]CH_3COO(CH_2)_3CH_3 + H_2O --- > C_4H_9OH + CH_3CO_2H[/tex]

Acid hydrolysis of esters is the reverse of the esterification process. During ester formation or esterification, carboxylic acids and alcohols react to produce ester and water as follows:

[tex]C_4H_9OH + CH_3CO_2H-- > CH_3COO(CH_2)_3CH_3 + H_2O[/tex]

Thus, acid hydrolysis of esters is a reversible reaction that does not go into completion ordinarily.

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1) Covering with greases on the iron  stops air and water from being in contact with the iron.

2) The substance that can react with copper to make  copper carbonate is silver carbonate

3) The combustion of lithium produces lithium oxide

4) The table is not shown hence the question can not be answered

5) another metal, oil and grease

6) The chemical reaction creates new substances.

7)  ​​A corrosion reaction is a chemical reaction that happens on the surface of a metal.

8) .In a chemical equation, the reactants and products are different from each other.

9)  ​​As silver reacts with polluted air, a black compound,  silver oxide is formed.

In the process of oxidation, we are just burning up a substance in oxygen. When we burn the substance in oxygen, there is an increase in the oxidation number of the object and oxygen is also added to the object. This is what we call oxidation of a substances.

Now we know that oxygen is abundant in the universe and thus it can be used in the burning of a substances. In effect we can look at the process of combustion as a situation in which we burn an object in air.

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Summer is when we are facing the sun and winter is when we are facing away from the sun which is referred to as a true statement.

This is referred to as the time of the year when the sun is hot and it is known as the hottest of the four temperate seasons. This usually occurs after spring and before autumn and the temperature is usually high when compared to other seasons.

Winter on the other hand is referred to as the coldest season of the year and it usually occurs between autumn and spring.

Summer therefore occurs when we are facing the sun while winter occurs when we are facing away from the sun which explains the little amount of sunlight experienced in such location and is therefore the reason why true was chosen as the correct choice.

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The full question is :

summer is when we are facing the sun and winter is when we are facing away from the sun true/false

Endothermic reaction shifts to the right to make products and performs an equilibrium shift.

An endothermic reaction is any thermodynamic method with a boom in the enthalpy H of the gadget. In this kind of process, a closed gadget generally absorbs thermal power from its environment, that's warmth transfer into the device.

Endothermic reactions are chemical reactions wherein the reactants soak up warm energy from the environment to form merchandise. Those reactions lower the temperature of their surrounding place, thereby developing a cooling effect.

The reactions in which heat is absorbed are known as endothermic reactions. If the actual quantity of warmth absorbed is understood then this quantity is written in any other case genuinely the phrase warmness is written. Eg: N2(g) + O2(g) + warmth → 2NO(g)

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The melting point of transition elements increases up to d 5 and then drops over time as the atomic number rises.

Transitional elements are those that have their d orbitals only partially filled. According to IUPAC, a transition element is an element with a partially full d subshell of electrons or an element with a partially filled d orbital that can form stable cations.

As was previously discovered, the higher the metal's melting temperature, the more delocalized electrons there are and the smaller the atom's radius. The number of delocalized electrons per metal atom rises as we cross period 3, and the radius of the elements decreases. This implies that the melting point rises.

Thus,The melting point of transition elements increases up to d 5 and then drops over time as the atomic number rises.

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The dimension of the pool is Width = 13.5 ft  , depth = 8 ft , length = 60.75 ft .

The volume expression is given as :

V = L × W × D

where ,

L = length = 4.5 times Width

W = width = ?

D = depth = 8 ft

V = volume = 5184

5184 = 6 × W × 4.5W

5184 = 27 W²

W² = 5184 / 27

W² = 192

W = 13.8 ft

therefore, A rectangular swimming pool is 8 ft deep. One side of the pool is 4,5 times longer than the other. The amount of water needed to fill the swimming pool is 5184 cubic feet the dimensions are Width = 13.5 ft , depth = 8 ft, length = 60.75 ft.

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The process of two complementary single-stranded DNA and/or RNA molecules joining together to generate a double-stranded molecule is known as hybridization in the context of genomics. The proper base pairing between the two single-stranded molecules is necessary for the bonding.Sp3 hybridization is the process of hybridization in which the 1s and 3p orbitals of the same element are mixed and recast to create new hybrid orbitals with the same energy, symmetry, and fixed orientation in space. An example is the creation of the methane molecule.

Linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral are the five fundamental hybridization shapes.

To find the formal charge of a Lewis structure, count the number of electrons "owned" by each atom. Count all lone pairs and half of the bond electrons. The difference between the number of valence electrons in an atom and the number it has is the formal charge. Fluorine (and all halogens) tend to form bonds and have three unshared pairs of electrons. None of these atoms have a formal charge in their electronic configuration.

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Amontons's law, Charles's law, Boyle's law and Avogadro's law are applied in ideal gas equation.

According to Boyle's Law, gas volume grows as pressure lowers. According to Charles' Law, a gas expands in volume as its temperature rises. Additionally, Avogadro's Law states that as gas concentration rises, so does its volume. The macroscopic characteristics of ideal gases are related by the ideal gas law (PV = nRT). A gas is considered to be ideal if its particles neither attract nor repel one another and occupy any space (have no volume).

Hence, ideal gas equation summation of individual gas laws.

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