In the equation 2K(s) + 2H2O(l) → 2K(OH)(aq) + H2(g), identify the physical state of each reactant and product

There would be 4 valence electrons  in an atom with 14 protons

An element is any substance made entirely of one type of atom. For instance, all of the atoms that make up the element carbon are carbon atoms. The atomic number of an element describes how many protons are present in that element's atoms. Inside a neutral atom, the number of protons and electrons must be equal.

The atomic number of an element also serves as a guide to its location on the periodic table.

According to the question, an element has 14 electrons. This implies that it must have 14 protons, indicating that its atomic number is 14.

We must first list any possible electrical configurations for the element before we may locate it:

1s²2s²2p⁶3s²3p²

In the outermost shell, there are four electrons. The element therefore has 4 electrons in its valence shell is 4

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A compound has the empirical formula CH and is made up of carbon and hydrogen. the compound's molecular formula is C6 H6.

Compounds that involve a metal binding with a non-metal or a semi-metal will typically exhibit ionic bonding. Molecular compounds are those whose only non-metals or semi-metals contain non-metals. These compounds exhibit covalent bonding.

The compound with the lowest whole number ratio can be found in its empirical formula.

The empirical formula for weight is 12+1=13,

while the molecular formula for weight is 13 78 = 6.

The molecular formula for weight is (CH)n = (CH)6 =C6 H6.

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1.trans-[Pt(en)2Cl2]2+  

2.coordination compound Na [Al (OH)] systematic name: sodium tetrahydroxidoaluminate (III)

For several industrial and technical applications, sodium aluminate serves as an efficient supply of aluminum hydroxide. A white crystalline solid with the chemical formula NaAlO2, NaAl(OH)4 (hydrated), [2] Na2OAl2O3, or Na2Al2O4, pure sodium aluminate (anhydrous) is a white substance. Both a solution and a solid form of sodium aluminate are sold commercially.Other comparable compounds, often referred to as sodium aluminate, include Na5AlO4 and Na7Al3O8, which contain complex polymeric anions and Na17Al5O16 and NaAl11O17, which was originally wrongly thought to be -alumina, a phase of aluminum oxide.Aluminum chloride, sodium chloride, and water are produced when hydrogen chloride and sodium tetrahydroxoaluminate interact. Diluted hydrogen chloride in a solution form.

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The correct answer is : Nitrogen's molecule bends into a trigonal pyramidal shape due to the presence of one lone pair of electrons

O eg=tetrahedral, mg=trigonal pyramidal

The electron geometry (eg) of NCl3 is determined by the positions of the electrons around the central atom, nitrogen (N). NCl3 has one lone pair of electrons on nitrogen and three bonding pairs of electrons with chlorine atoms, so the electron geometry is tetrahedral. NCl3's molecular geometry (mg) is determined by the atom positions in the molecule. In a trigonal pyramidal shape, NCl3 has one nitrogen atom in the centre and three chlorine atoms surrounding it. Nitrogen's molecule bends into a trigonal pyramidal shape due to the presence of one lone pair of electrons. Electron geometry, also known as electron pair geometry, is the arrangement of electron pairs in a molecule or ion around a central atom. It is determined by the number of electron pairs surrounding the central atom, which includes both bonding pairs and lone electron pairs. The electron geometry can be used to predict the overall shape of a molecule or ion and also helps to understand the polarity of the molecule.

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Answer:

Explanation:

A. Periodic table is beautifully arranged to place elements with similar chemical properties together. A family or a group is a vertical column in periodic table that has elements with similar property.

B. They all have similar properties because they all have the same number of valence electrons that determine the chemical properties such as reactivity of the element.

C. Lithium, sodium, potassium all fall in group 1 called alkali metals and these elements all share the property of being some of the most reactive elements.

The assumed or arbitrary molarity of anions in the chemist's solution is found out to be 2.17 M.

Since neither the mass of magnesium bromide  and the volume of the volumetric flask are not given, one can assume arbitrary values and you could modify them whenever you want, thus, let 50.0g of magnesium bromide to be the measured out amount of solute and a 250-mL volumetric flask where the solution is prepared, so the final volume of the solution is 250 mL after the addition of distilled water. In this manner, the bromide anions moles, taking into account there are two bromide moles per magnesium bromide moles giving the value of 0.543 mols.

The molarity can be calculated as follows:

M= 0.543 mol Br-/0.250 L= 2.17 M

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If it takes 75.0mL of a 2.50M HCl solution to neutralize 55.0mL of a base unknown concentration, the concentration of a unknown basic solution is 1.83M.

Molarity in chemistry is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

The molarity of two solutions in a neutralization reaction can be calculated as follows:

CaVa = CbVb

Where;

According to this question, 75.0mL of a 2.50M HCl solution is required to neutralize 55.0mL of a base unknown concentration. The concentration of the solution can be calculated as follows:

2.5/75 = Cb/55

0.0333333333 × 55 = Cb

Cb = 1.83M

Therefore, 1.83M is the molarity of the unknown basic solution.

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In comparison to non-polar hydrocarbon dielectrics like gasoline and diesel fuel, methanol is a polar substance like water and has a relatively high conductivity (conductivities less than 1 x 10⁴ pS/m).

Therefore, the self dissociation into ions for methanol and ethanol will be less strong than in water. But even in pure ethanol and methanol solutions, these ions will still exist and conduct electricity, albeit at very low conductivities.

Water's electrical conductivity is a measure of how well it can carry a current of electricity. The amount of electrical current that can be conducted in water increases with the concentration of dissolved charged chemicals, also referred to as salts.

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No, one molecule does not make up a mole. In chemistry, the terms "mole" and "molecule" are used interchangeably.

The word "mole" is used to describe a quantity that cannot be expressed in terms of grams or milligrams. A mole thus counts the quantity of atoms, ions, or molecules.

A molecule is a type of chemical that develops when multiple atoms are combined by chemical bonding. Electrical charge does not exist in molecules. A molecule's constituent atoms may come from the same element or from separate elements. Varying molecules have different ratios between these atoms. Molecules are a unit of measurement for the quantity of molecules in a system.

The primary distinction between a mole and a molecule is that a mole is a unit of measurement for amount whereas a molecule is an atomized chemical species.

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The elements belonging to group 1 are more reactive than elements belonging to group 2.

The elements that belongs to s block elements are hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). The nature of alkali metals is soft and shiny in appearance. They have low melting point and are highly reactive in nature and usually tarnish when exposed to air. Sodium (Na) is the most reactive element since it's valence electrons are not tightly held together in the atom. The three elements that are highly reactive are Lithium (Li), Sodium (Na), and potassium (K). The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive.

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To solve this we must be knowing each and every concept related to mutation and types of mutations. Therefore, the correct option is option C.

A mutation is, at its most basic, a change or alteration. Chromosome and gene alterations, known as mutations in biology, frequently appear physically.

One grizzly bear population has moved to an area that has snow year-round. If a mutation for coat color is going to spread through the population then Grizzly bears that have a lighter fur mutation can catch prey more easily and so have more resources to have more offspring. Due to this, the trait starts to spread through the population.

Therefore, the correct option is option C.

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Answer:

P₂N₂I₄

Explanation:

Firstly, we calculate the empirical formula of the compound. To do this we find the moles of each element. Treat the percentages as masses.

The formula for moles is:

[tex]moles = \frac{mass}{relative \: atomic \: mass}[/tex]

The masses of each element are:

Phosphorus = 10.37g

Nitrogen = 4.689g

Iodine = 84.95g

The relative atomic masses of each element are:

Phosphorus = 31.0

Nitrogen = 14.0

Iodine = 126.9

Using these values, we can calculate the moles of each element:

[tex]moles \: of \: phosphorus = \frac{10.37}{31.0} = 0.335[/tex]

[tex]moles \: of \: nitrogen \: = \: \frac{4.689}{14.0} = 0.335[/tex]

[tex]moles \: of \: iodine \: = \: \frac{84.95}{126.9} = 0.669[/tex]

Using the moles, write them in a ratio to find the ratio of moles:

Phosphorus : nitrogen: iodine

0.335 : 0.335: 0.669

The smallest number here is 0.335, so divide each number by 0.335

0.335÷0.335=1

0.335÷0.335=1

0.669÷0.335=1.99... = 2 (round to the nearest whole number)

These numbers are used as the subscripts of each element.

This means that the empirical formula is:

PNI₂

To calculate the molecular formula:

[tex]\frac{molar \: mass \: of \: molecular \: formula}{molar \: mass \: of \: empirical \: formula}[/tex]

The molar mass of empirical formula is adding the molar masses of compound PNI2:

31.0 + 14.0 + 126.9 = 171.9

The molar mass of molecular weight or mass = 298.8 (given from the question)

Substitute these in the formula above:

[tex] \frac{298.8}{171.9} = 1.738...[/tex]

1.738 = 2 rounded to the nearest whole number.

Multiply all the subscripts seen in the empirical formula by the number 2:

PNI₂ × 2 = P₂N₂I₄

The normal boiling point for acetone is 56.5°C. At an elevation of 5300 ft the atmospheric pressure is 630. torr. The vapor pressure of acetone at 22.0°C at this elevation is 212.22 torr.

The equilibrium pressure of a vapour above its liquid (or solid), or the pressure of the vapour produced by the evaporation of a liquid (or solid) above a sample of the liquid (or solid) in a closed container, is the vapour pressure of a liquid. Substance; vapour pressure at 25 °C, as examples.

In Step 1:

The normal boiling point for acetone = 56.5°C.

At an elevation of 5300 ft the atmospheric pressure = 630 torr

ΔHvap = 32.0 kJ/mol

The temperature is 24.0 °C

In Step 2:

ln(p1/p2) = (∆ H/R) (1/T2 - 1/T1)

Normal atmospheric pressure

= 1 atm

= 760 torr

So, (760/630) = ((32.000 J/mol) / (8.314 J/K*mol)) (1/T2 - 1/329.65 K).

T2 = 324.4 K = 51.25 °C.  

This is the boiling point of acetone at 5300 ft.

The vapor pressure = atmospheric pressure at the boiling point for any liquid.

ln (Pv/630atm) = ((32.000 J/mol) / (8.314 J/K*mol)) (1/324.4 K - 1/297.15)

ln (Pv/630) = -13615388.3

Pv = 212.22 torr

Thus, The vapor pressure of acetone at 22.0°C at this elevation is 212.22 torr.

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Answer:

it is 1 mole of I is correct

Only the molecules of NO, SO2 are polar. These chemicals are referred to as polar solvents since they have both positive as well as ends.

a structure where the density of electrons is unevenly distributed. Nonpolar refers to a structure where the density of electrons is more or more uniformly distributed. Numerous physical, molecular, and ecological properties of molecules are influenced by polarity, which can take many different forms.

A polar molecule bond is one in which there is an electrostatic potential difference in between atoms of between 0.5 and 2.0. A polar covalent link is a type of covalent bond with which the atoms are attracted to electrons in uneven amounts, resulting in looked.

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Answer:

CO₂H

Explanation:

The empirical formula gives the smallest whole number ratio of atoms of each element in a compound.

The ratio of hydrogen, carbon and oxygen in H₂C₂O₄ is:

H : C : O

2 : 2 : 4

They have a common factor of 2, so we can divide the atoms of each element by 2:

H : C : O

1 : 1 : 2

This gives us HCO₂ or CO₂H

According to stoichiometry and STP conditions ,1785.90 liters of hydrogen is produced.

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given reaction as per stoichiometry, 149.84 g of As produces 6 g hydrogen , thus, 39.3 g of As will produce 39.3×6/149.84=1.573 g.

As per STP conditions, V=1.573/2×8.314×273/1=1785.90 liters.

Thus, 1785.90 liters of hydrogen is produced.

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To find a proton number, we can use the Periodic Table of the Elements.

The Periodic Table of the Elements is a table that organizes all discovered chemical elements in rows and columns according to the increasing atomic number.

To find the numbers of protons using this periodic table, first, we have to find the element on the periodic table. Using the columns (group) or rows (period) can make the element easier to find on the table.

Second, find the element’s atomic number, which is located above the element symbol, in the upper left-hand corner of the square. This atomic number will tell us how many protons make up a single atom of that element. For example, Boron (B) has an atomic number of 5, consequently it has 5 protons.

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Solids known as molecular solids are made up of molecules. Intermolecular forces such as hydrogen bonds, dipole-dipole forces, and dispersion forces hold together molecular solids. Solids with ions as their constituent parts are known as ionic solids. Ion-dipole forces keep ionic solids together.

Atomic solids are those whose constituent atoms make up their entire structure. Atomic solids can be broken down into the three categories below, each of which is held together by a distinct set of forces. Dispersion forces atomic solids is the first category, which only consists of noble gases in their solid states and is held together by coulombic forces that are comparatively weak. Metallic atomic solids fall under the second category, which is held together by nonbonding bonds and contains substances like copper and silver as examples. Network covalent atomic solids are the final group of materials that are held together by covalent bonds and include materials like silicon dioxide, graphite, and diamond.

Intermolecular forces can be divided into three categories: hydrogen bonds, dipole-dipole interactions, and London dispersion forces (LDF). Despite the fact that molecules can have any combination of these three types of intermolecular forces, all substances at least have LDF.

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Answer:

Explanation:

Mass the fluid, find its volume, and divide mass by volume. To mass the fluid, weigh it in a container, pour it out, weigh the empty container, and subtract the mass of the empty container from the full container. To find the volume of the fluid, you simply measure it very carefully in a graduated cylinder.

The mass % of carbon in dimethyl sulfoxide (C2H6SO) rounded to three significant figure is calculated as 30.718%.

Mass percent of a solution is defined as the ratio of the mass of solute that is present in solution, relative to the mass of solution as a whole. To calculate mass percent of an element in a compound, we divide mass of the element in 1 mole of the compound by the molar mass and then multiply the result by 100.

As we know molar mass of carbon is 12 g/mol and molar mass of dimethyl sulfoxide is 78.13 g/mol

Mass % of carbon (C2) in dimethyl sulfoxide (C2H6SO) = 2* (12/78.13) * 100

= 30.718%

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sauce burning on a stove and firing a clay pot in a hot kilnBoth are physical changes. Therefore, option D is correct.

Physical changes can be defined as changes affecting the state of a chemical substance, but not its composition. Physical changes can be used to separate mixtures into their component compounds, but can not generally be used to separate compounds into elements or simpler compounds.

Physical changes takes place when substances undergo a change that can not change their composition. while the chemical change in which the composition of a substance changes when substances combine or break up to form new substances.

In general a physical change can be consideed as reversible using physical means. A physical change includes a change in physical properties such as change of strength, change of durability, textural change, shape, size, volume and density.

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In the molecule C2H4, valence orbitals of the carbon atoms are assumed to be e) sp^2 hybridized.

The set of orbitals that can energetically accept electrons to create chemical bonds is known as the valence shell. The ns and np orbitals in the outermost electron shell make form the valence shell for main-group elements.

The outside electrons engaged in bonding are called valence electrons. A particular atom can have 0 to 7 valance electrons since valance electrons can only exist in the s and p orbitals. Noble gases are atoms that have no valence electrons and dislike forming bonds.

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The atomic number is the number of protons in the nucleus of an atom and it directly affects the properties of an element. The atomic number also determines the element's place in the periodic table, which allows us to predict the properties of an element based on its atomic number.

As the atomic number increases, the number of protons in the nucleus increases and so does the atomic number. This increase in protons also increases the number of electrons in the atom. The number and arrangement of electrons in an atom directly affect its chemical behavior and thus the properties of the element.

The atomic number also determines the element's position on the periodic table, and elements with similar atomic numbers have similar chemical and physical properties. For example, elements in the same vertical row (group) have similar chemical properties, and elements in the same horizontal row (period) have similar electronic configurations of their atoms.

The atomic number also affects the reactivity of an element. Elements with lower atomic numbers tend to be more reactive than elements with higher atomic numbers.

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Answer:

heating the mixture until one liqiid remains

Explanation:

This is because the liquids have different boiling points there fore meaning that one liquid will evaporate begore the other

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore, 0.630 is the gram molecular mass of this gas.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density = Mass of the gas ÷volume marked on the graduated cylinder

density= 0.630 grams per liter

means 0.630 grams of an unknown gas is present in 1 liter of solution

Therefore, 0.630 is the gram molecular mass of this gas.

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Please put on a lab apron. It helps shield clothing from damage and stains. Examining glass for fractures and chips. This damaged or chipped glassware needs to be properly disposed of.

In order to deal with it safely, we must take the appropriate precautions. Skin burns or other skin injury can be brought on by sodium hydroxide. Additionally, it can injure eyes. Learn as much as you can about the chemicals that will be utilized, including any exposure or leak risks. Find the spill kits and learn how to use them. Verify labels and throw away any chemicals that aren't 100 percent pure. For ease of access, alphabetize the lab chemicals. Security is the practice of keeping unwelcome dangers and hazards out of the lab environment.

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A blend of dyes called a universal indicator gradually changes color throughout a pH range of 4 to 14. The color serves as a direct indicator of pH.

Thymol blue, methyl red, bromothymol blue, and phenolphthalein are the primary ingredients of a universal indicator in the form of a solution. Colors ranging from yellow to red denote an acidic solution, whereas colors ranging from blue to violet denote an alkaline solution and green denotes a neutral solution. Substances called indicators are those whose solutions change color as the pH changes. We refer to these as acid-base indicators. The conjugate base or acid versions of these typically weak acids or bases have various hues because of variations in their absorption spectra.

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Prevent the spread of dusts and vapors.Neutralize acids and bases, if feasible. Manage the spread of the liquid.absorb the liquid.Gather and incorporate the cleanup residues. Get rid of the wastes. Decontaminate the area and affected system.

Chemical spills are the uncontrolled launch of a dangerous chemical, both as a strong, liquid or a gas. these spills need to be minimized as tons as possible.

Chemical spills usually result from the dangerous handling of chemical compounds, incorrect chemical storage, chemical garage tank ruptures, incorrect containers for chemical disposal, and failure to eliminate chemical substances in a well timed way.

There are sorts of spills that you can run into: simple Chemical Spills and complex Chemical Spills. easy Chemical Spills are small, confined, and present minimal dangers.

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