What does it mean that a homogeneous mixture has a single phase

The periodic properties of the d-block elements differ from the main group elements in that they are less sensitive and less reactive.

The periodic table is divided into blocks; s-block, p-block, f-block, and d-block. The d-block elements are also known as transition metals.

The s and p-block elements are known as the main group elements. Compared to these, the d-block elements have some different properties because of their partially filled d-orbitals.

However, the d-block elements still have many similar properties. These elements can still displace hydrogen from dilute acid and some of them can react with water under appropriate conditions.

The first row of these transition metals are found to be more reactive than the second and third row. However, they are not as reactive as the s-block and p-block elements.

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Scandium: atomic mass electronegativity electron affinity ionization energy heat of fusion atomic mass of scandium is 44.95 u and electronegativity of scandium is 1.36 and electron affinity of scandium is 18.1kJmol⁻¹ and ionization energy of scandium 631kJ and heat of fusion of scandium is 14.1kJ/mol

Scandium is an element with the atomic number 21 and represented by symbol Sc in the periodic table and scandium is mined from one of the rare minerals from Scandinavia and the color it develops when exposed to air is yellowish or pinkish cast

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The chloroplasts of the plant is the point where carbon dioxide does react with water and the products are sugars and oxygen.

We know that the plant obtains its energy form the sun. The sun is called the primary producer in the eco system. This is because the energy from the sun is trapped by the chloroplast of the plants.

Let us note that the chloroplast contains the chlorophyll which is the colored pigment that absorbs the light from the sun. This light that is absorbed from the sun acts a catalyst in a complex reaction in which the carbon dioxide combines with water to form sugars and oxygen.

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If a piece of metal, such as calcium or magnesium, reacts with atmospheric oxygen, the product would be expected to have a greater mass than the reacting metal.

Every chemical reaction agrees with the law of conservation of mass.

According to this law, the mass of substances is conserved during the process of undergoing reactions. However, the mass could have been converted from one form to another during the reaction.

Going by this law, if substance A reacts with substance B to form a new substance AB, the mass of AB would be the addition of individual masses of A and B.

Thus, if a metal reacts with oxygen in the air, the mass of the product should be the mass of the metal plus the mass of the oxygen that reacts to form the product.

For example: [tex]2Mg + O_2 --- > 2MgO[/tex]

The mass of MgO, in this case, would be the mass of the Mg and the mass of the [tex]O_2[/tex]. Thus, the mass of MgO would be greater than the mass of Mg.

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Option c is correct which says both beryllium and chlorine form covalent bonds.

What are covalent bonds?

When the bonds between the atoms are formed via the mutual sharing of electrons are called covalent bonds.

The bonding between the beryllium chloride is covalent due to the following reasons:

• The beryllium atom has an ionization energy of 900kj/mol which is quite high. Therefore, it can not form cations which are necessary for ionic bonding.

• The beryllium atom has two electrons in its orbitals to share with chlorine atoms electrons.

Hence, this way the bonding between them is covalent and the correct answer is option c.

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There are 9 steps of the election process Call for Nominations, Preliminary Reviews, Ballot Petition Rules, Nominee Interviews, Committee Meeting, Slate of Candidates Announcement, Voting Opens etc..

Request for Nominations

The nomination process is made public by the Academy.

introductory reviews

Candidates are required to submit biographical sketches that contain digital images, films they have recorded themselves, and curriculum vitae or resumes.

Election Petition Rules

Check out the requirements for adding a petitioner to the general election ballot.

interviewing nominees

Virtual meetings with the Nominating Committee are held.

Commission Meeting

The Nominating Committee meets in late fall to review the materials submitted by candidates, taking into account which positions are open on the ballot, and evaluating key personal, interpersonal, and demonstrated leadership skills as they relate to the qualifications and skill set needs for each position.

Release of the Candidate Slate

Announcing candidates for posts includes posting supporting information online, in the Academy's electronic weekly newsletter, and on social media, including images, self-recorded films, biographical sketches, and answers to questions posed by the Nominating Committee.

Voting begins

Members take part in computerised voting during the month of February for the national Academy elections.

Announcing the results of the election

Following the tallying of all votes and the notification of candidates, the Academy informs members of the election results.

Review of the election and nomination processes

The process for nomination and election is assessed at each stage. The Nominating Committee, the Academy, and the applicants are all asked for their opinions.

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Answer:

The Quantum Mechanical Model suggested that electrons do not move in fixed shells as the Bohr Model suggested, but rather acted as a cloud of electrons with orbitals electrons can most commonly be found in.

-6.78x[tex]10^{3}[/tex] kj /mol is the correct answer

What is the internal energy?

Rising temperature and changes in state or phase from solid to liquid and liquid to gas cause a rise in internal energy. Planetary bodies can be viewed as a fusion of heat engines and heat reservoirs

Internal drive U is the sum of the kinetic energy brought about by the motion of molecules and the potential energy brought about by the vibrational motion and electric energy of atoms. The energy contained in every chemical link is often referred to as internal energy. From a microscopic perspective, the internal energy can take on a variety of shapes. For any substance or chemical attraction between molecules.

Mol of decane = mass/ molar mass

                       =  1/142.29

1/142.29 mol gives internal energy =810.1 x58.8

So1 mol gives  810.1 x58.8x1/142.29 internal energy

so internal energy changes = 810.1 x58.8x1/142.29

                                              -6.78x[tex]10^{3}[/tex] kj /mol

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Answer:

same amount of matter exists before and after the change—none is created or destroyed

Explanation:

example

water will have the same mass when it freezes into ice

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A box falls from a high shelf. If the box reaches a velocity of 7.6 m/s

just before it hits the ground, the height of the shelf is 2.9 m.

given that :

velocity = 7.6 m/s

the expression for the velocity of an object falls from height

v² = 2 g h

g is acceleration due to gravity

h is the height

v is velocity of box

substituting the values in formula , we get :

v² = 2 g h

(7.6)² = 2 × 9.8 × h

h = 57.76 / 19.6

h = 2.9 m

the height is 2.9 m.

Thus, A box falls from a high shelf. If the box reaches a velocity of 7.6 m/s. just before it hits the ground, the height of the shelf is 2.9 m.

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The solubility of the Ca(OH)2 would be greatly increased since the lower temperatures would result in a slower titration and the solution would have time to warm up.

What is titration?

When a reaction reaches neutralisation, which is sometimes signalled by a colour change, titration is the steady addition of one solution with a known concentration (referred to as a titrant) to a known volume of another solution with an unknown concentration. To be a primary or secondary standard, the so-called titrant must meet the appropriate criteria. Titration is a method for figuring out a solution's concentration in a wide sense.

One of the processes in the manufacture of silver nanoparticles involves gently combining sodium borohydride with silver nitrate in an ice bath to create yellow colloidal silver.

Since the titration would proceed more slowly at the lower temperatures and the solubility of the Ca(OH)2 would increase dramatically as the solution warmed, it was necessary to titrate the cold solution in the ice bath.

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Evidence is there that joule had a exceptional education are :

Joule was educated at home  with private tutors. When he was child , his father hired leading scientist as the great scientist john Dalton to be his teacher. when he was young he had taken brewery and missed out university. other than this joule had exceptional education. They were taught chemistry , physics the scientific method. he study to continue in home based laboratory. in this laboratory he performed experiments before and after work. Joule gave relationship between heat , electricity and mechanical work but it was widely ignored but later on Thomson recognized joule's work .  

Thus, Joule had a exceptional education .

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The concentration of Li⁺, [Li⁺] in the diluted solution is 0.01625 M.

The concentration of a solution is the amount of the solute dissolves in a given volume of the solvent or solution.

The concentration of a solution can be diluted.

The concentration of a solution after dilution can be calculated as follows;

C₁V₁ = C₂V₂

The given data is as follows:

C₁ = 0.25 M

V₁ = 65.0 mL

C₂ = ?

V₂ = 1.00L or 1000 mL

The new concentration will be:

C₂ = C₁V₁ / V₂

C₂ = 0.25 * 65 / 1000

C₂ = 0.01625 M

1 mole LiCl produces 1 mole Li⁺

Concentration of Li⁺ = 0.01625 M

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Xenoliths are pieces of rock trapped in another rock that are older than white granite due to the principle of inclusion.

The principle of inclusion states that rock included in another rock should always be older than the inclusion rock and therefore ti can be used to estimate the age of different types of rocks.

Therefore, with this data, we can see that the principle of inclusion is used to estimate the age of rock and it is based on the layer of different types of rocks

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Answer:-

an orbital road

Explanation:-

orbital, in chemistry and physics, a mathematical expression, called a wave function, that describes properties characteristic of no more than two electrons in the vicinity of an atomic nucleus or of a system of nuclei as in a molecule.

Related Topics:- g-orbital p-orbital f-orbital over...

Subjects Of Study:- atomic model line spectrum

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Answer:

An orbital, also called electron shell, is the path around which the electrons orbit the nucleus of the atom. It has a capacity of 2 electrons in the first orbital, and 8 in the rest. The number of orbitals in an atom can help us find out the period number of that atom.

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The compounds that would end in  "-ide" are;

1) Na₂S

2) CO2

3) AIP

We know that chemical compounds can be identified by the name of the compound. Also, the name of the compound reflects the kind of species that we have in the compound. The task that we have here is that we need to find out the three compounds that would have the ending  "-ide" in their names.

We have to know that the names of chemical compounds are often chosen by the International Union of Pure and Applied Chemistry (IUPAC). These rules are revised from time to time and are thus updated in order to help us to identify compounds.

It is important to note that the compounds whose names are most likely to end in the term  "-ide" would be the binary compounds that are composed of the metals and the non metals.

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Keeping pollutants from getting into the water system is better than cleaning the water up after it is polluted this statement is false

Water pollutant means it is the contamination of water sources by substances which make the water unusable for drinking as well as cooking, cleaning, swimming and other activities so the given statement are false because if we do not pollute the water system then there is no need for cleanup the water system that's why the keeping pollutant from getting into the water is better

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The name of N₂Cl₄ is Dinitrogen Tetrachloride. the type of bond between is covalent bond. The steps use to name the compound is nomenclature.

The given compound N₂Cl₄  name is Dinitrogen Tetra chloride. In this compound , Nitrogen and Chlorine are non metals . nonmetals are electronegative elements that means they want to gain electron.  according to octet rule , atom need to have 8 electrons in outermost shell and it occurs by sharing of electron or by transferring of electron.

In case of nitrogen and chlorine both are electronegative and wants to gain electron so that they will complete their octet. The atom will complete their octet by sharing of electron. Hence form covalent bond.

Two nitrogen atoms are central atom and two chlorine atom connected to each nitrogen atom forming covalent bond.

two nitrogen = Dinitrogen ( Di for two)

four chlorine = tetrachloride ( tetra for 4 )

N₂Cl₄ = Dinitrogen tetrachloride

Thus, The name of N₂Cl₄ is Dinitrogen Tetrachloride. the type of bond between is covalent bond. The steps use to name the compound is nomenclature.

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The dimensions of a crystal's surfaces (also referred to as "faces"), edges, and angles between them all play a role in determining its shape.

The distinctive external shape of a single crystal or crystal group is known as a crystal habit in mineralogy. A crystal's habit depends on its crystallographic form and growth circumstances, which typically results in irregularities because there isn't much room in the crystallizing medium (commonly in rocks). Habit, a characteristic closely related to crystal shape, includes the size and shape of the crystal faces, the way in which different forms combine, the degree to which they are each developed, and the way in which different crystals coexist. Therefore, habit is the distinctive appearance that a mineral can have.

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Answer:

Food , substance consisting essentially of protein, carbohydrate, fat, and other nutrients used in the body of an organism to sustain growth and vital processes and to furnish energy.

Option D represent atomic model at best.

Atomic theory is a scientific that matter consists of particles known as atoms. Atomic idea traces its origins to an historic philosophical way of life referred to as atomism. According to this idea, if one were to take a lump of depend and cut it into ever smaller portions, one might eventually reach a factor where the pieces could not be in addition reduce into anything smaller. Ancient Greek philosophers called these hypothetical final debris of matter atomos, a phrase which intended "uncut"

Through the early twentieth century, scientists had developed pretty unique and specific models for the structure of count, which led to extra rigorously-described classifications for the tiny invisible particles that make up everyday remember. An atom is now defined because the basic particle that composes a chemical detail.

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It is true that according to Hubble's law, the farther away a galaxy is, the faster it is moving away from us.

It is true that the formation of a star occurs when nuclear fusion begins to fuse light elements into heavier ones;

The distance to the nearest stars can be determined by parallax, the apparent shift of a start against background stars observed as the earth moves along its orbit. (Option B)

Based on the accompanying H-R Diagram, the type of start that has the greatest temperature is the blue giants (Option C)

Two hydrogen atoms come together in a nuclear fusion reaction to produce Helium Gas. (Option A).

Hubble's law, which essentially states that the velocity of a galaxy (or, as it is commonly plotted, its redshift) is precisely proportionate to its distance, also reveals crucial information about the condition of the universe. There should be no relationship between distance and velocity if the cosmos is static and unchanging.

Hubble's law is the physical cosmology observation that galaxies move away from Earth at a rate proportionate to their distance. In other words, the farther they are from Earth, the quicker they are travelling away.

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Flash flood along a normally dry river valley be a dangerous event densely populated area also river valley are so dangerous for flash flood

Flash flood is the move at very fast speed and can roll bounders also tear out tree and destroy building and destroy bridges also and wall of water can rich height 10 to 20 feet and and flash flood are so dangerous in the densely populated area as well as river valley it is so high risk for flash flood and flash flood is the more common in the area where dry climate and rocky terrain are seen because there is lack of soil and vegetation allow torrential rain to flow overland rather than infiltrate into the ground

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Water has a specific heat capacity of 4.186 J/g°C, which means it takes 4.186 J (1 calorie) of energy to heat a gram by one degree. is the system's temperature change.

The energy released  = 39501 J.

The specific heat capacity of the liquid water is 4.18 J / g °c.

so

Q = mx ΔT x [tex]C_{T}[/tex].

Q = 450 x 21 x  4.18

 = 39501 J.

The energy released  = 39501 J.

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Explanation:

We have to find the overall charge of a substance that contains 15 protons, 18 electrons and 16 neutrons.

A proton is a subatomic particle that we can find in the nucleus of an atom. Its charge is +1.

An electron is a subatomic particle that we can find around the nucleus and its charge is opposite to the one of the proton. Its charge is -1.

A neutron is a subatomic particle that can be found in the nucleus and has no charge, so its charge is 0.

charge of p+ = +1 charge of n° = 0 charge of e- = -1

Our element has 15 protons, 18 electrons and 16 neutrons, the overall charge will be.

overall charge = 15 * (+1) + 18 * (-1) + 16 * (0)

overall charge = -3

Answer: d. -3