PLEASE Answer! Using the periodic table, predict the order of decreasing electronegativity for the elements Al, Ag, Ca, Se, and I.

MgO contains three atoms in total, of which one is Mg and one was O.

Therefore, MgO contains only 1 atom of magnesium.

A chemical element was uniquely defined by its atoms, which are tiny pieces of substance. An atom is made up of a core nucleus and one or even more electrons with negative charges that orbit it. The positively charged, comparatively hefty protons as well as neutrons that make up the nucleus may be present.

The positively charged nucleus is located in the middle of an atom. It must be composed of two types of closely grouped subatomic particles.

Protons, which possess a positive electric charge, as well as neutrons, that have no electric charge, are just particles.

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The system was closed in which combustion experiment conducted. Thus, option D is correct.

A closed system is a system in which there is only transfer of energy is takes place this type of system is known as closed system.

Example - Transfer of heat from a cup of tea.

Mainly there are three type of system.

1:- Open System

2:- Closed System

3:- Isolated System

Open system:-

A system in which there is transfer of both energy and mass these types of system is called as open system.

Example:- Flow of water in a canals

Closed System:-

A  system in which there is only transfer of energy is takes place this type of system is known as closed system.

Example - Transfer of heat from a cup of tea.

Isolated system:-

A system in which there is no transfer of energy and mass these type of system is called as isolated system.

Example - A thermo flask

Therefore, the system was closed in which combustion experiment conducted. Thus, option D is correct.

The complete question is : At the start of the coal combustion experiment, the mass was 100 grams. At the end of the coal combustion experiment, the mass was 100 grams. During the combustion experiment, heat was transferred from the reaction vessel to the area surrounding the reaction vessel. What type of system was this combustion experiment conducted in?

A. isolated

B. insulated

C. open

D. closed

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Rf = Distance travelled by the substance from reference line (cm)/Distance travelled by the solvent front from reference line (cm) , the retention factor for this spot is 6.29/3.15 =1.9968.

The distribution constant is multiplied by the column's volume for stationary phase to determine the retention factor, which is then divided by the column's volume of mobile phase.

A ratio of the compound's travel distance to the solvent's travel distance is known as the Rf value.An Value of r will be low is if solvent only travels a modest distance.

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The type of scientific statement that describes a proven fact about how things function in nature is known as: laws.

Scientific statement is the type of statement that is potentially testable and backed up by some scientific methods (or proof). There are at least three types of scientific statements, which are as follows:

Hence, the correct answer is law.

This question seems incomplete. The complete query is as follows:

“Which type of scientific statement describes a proven fact about how things function in nature?

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1) Mixtures involves substances that are mixed together.

2) Colloids , suspensions and solutions are types of mixtures.

We know that the term mixture can be used to describe any two substances that are not chemically combined together. In other words, the term mixture has to do with the putting together of substances that would not lead to any change in the individual properties of the substances that have been mixed together. Two common examples of mixtures are blood and air.

There are various types of mixtures that we have and these include;

Solutions: A solution is a mixture because there is no interaction that is going on chemically between the solute and the solvent.

Colloid: A colloid is a kind of mixture that is made up solutes that can still be seen with the optical eye. That is, the solutes are still large enough

Suspension: A suspension is a kind of mixture in which a solute is scattered in the solvent.

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Flask 3 has higher mean square value.

Flask 1 (CO) – P1 = 760 torr

Flask 2 (N2) – P2 = 250 torr

Flask 3 (H2) – P3 = 100 torr

All these have same volume and temperature

•  Average Kinetic Energy:

(K.E.) avg = 3/2 RT

(K.E.) avg ∝ T, here T = Temperature

And all the flask has same temperature

So, they all have same Kinetic Energy.

The root mean square speed (C.R.M.S.) is given by,

CRMS = √ (3RT/Mo) = √ (3PV/Mo), where Mo is the molar mass

From above CRMS ∝ √ (P/Mo)

So, higher molar mass gas molecule has lower crms.

CO = Mo = (Mo)c + (Mo)o = 12 + 16 = 28

N2 = Mo = 2(Mo)N = 2 * 14 = 28

H2 = Mo = 2(Mo)H = 2 * 1 = 2

(Mo): - H2 < N2 = CO

Hence CRMS for Flask 3 > Flask 2 > Flask 1.

So, FLASK 3 has highest CRMS

•  Rate of effusion of gas (r) is inversely proportional to square root of density (d)

r ∝ 1 / √d

r ∝ 1 / √ Mo

therefore density (d) = Mo / 2

Mo: H2 < CO = N2

r: H2 > CO = N2

Flask 3 effuses higher than flask 1 & 2.

Thus,

Flask 3 has higher mean square value.

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The OH group accepts the proton of sulphuric acid in the described reaction. As a result, one water molecule is removed.

Following the elimination, a secondary carbocation is formed, which undergoes a 1, 2-hydrogen shift to create a more stable tertiary carbocation. Furthermore, the alkene contributes electrons to the tertiary carbocation, resulting in the formation of a cyclic molecule.

The mechanism is shown below:

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Answer: An ionic bond will be most likely formed between francium and chlorine having an electronegativity difference of 2.46.

Explanation:

The explanation we utilize the rms velocity rather than the normal is that for a commonplace gas test the typical speed is zero since the particles are moving every which way.

Root mean square (RMS) velocity is the square base of the amount of the squares of the stack speed values partitioned by the quantity of values. RMS speed is the speed of a wave going through underground developments at various span speeds along a given beam way.

For flat or marginally inclined layers, NMO and stacking speed are equivalent to RMS speed. In any case, in regions with huge parallel speed varieties, the stack velocity contrasts essentially from the RMS speed.

Conduction is the minuscule temperature inclination of the root-mean-square speed of issue. This substance can be either strong, fluid, or gas.

The explanation we utilize the rms velocity rather than the normal is that for a regular gas test the typical speed is zero since the particles are moving every which way.

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Answer:

alkali metals

Explanation:

alkali metals have only 1 electron in their outer shell so it is easier to lose it

The bond angle for SiO2 is 120 degrees. The bond angle for BF3 is 120 degrees. The bond angle for CFCl3 is 120 degrees. The bond angle for H2CS is 120 degrees

Bond angle is defined as the relationship between two bonds, or the angle among two orbitals in a complex molecule or ion that contain bonding electron pairs. It is determined by calculating using a spectroscopic method and measured in degrees. The bond lengths in a molecule is the angle formed by three connected nuclei. Electron domains have distinctive angles and structures. A central atom with two electron density regions, for example, is regarded linear with an angle of 180°. More complex structures have multiple angles. Valence bond model says a bent geometry for the molecule of water with a bond angle of 90° because the 2 2p orbitals are at right angles to each other.

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The change that happens to a sample of calcium carbonate as it cooled is: C. The forces strengthen, and the molecule structure becomes more rigid.

When a compound cooled down, the speed of the molecules decreases. It causes the reduction of the kinetic energy and allows the attraction between molecules to bring them closer to each other. As this process happens, the forces strengthen and cause the molecule structure to become more rigid. Hence, the correct answer is C.

This question is incomplete. The complete query is as follows:

“A sample of calcium carbonate is cooled. Which change happens to the molecules of calcium carbonate in the sample?

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Answer: Answer is C

Explanation:

They gave him the name Cupid, which is another name for Eros and also means "desire."For the Romans, Cupid was usually a cute little lad who carried out his mother's instructions to make individuals fall in love.

Eros (Roman Cupid), the deity of love, and his wife PSYKHE (Psyche), the goddess of a soul.She was originally a mortal princess, and when mankind started to worship her instead of the goddess Aphrodite (Roman Venus), the goddess became enraged.

According to Apuleius, Voluptas and Volupta is indeed the daughter of Cupid and Psyche in Roman mythology.The Latin term voluptas, which is also known as that of the goddess for "sensual pleasures," signifies "pleasure" or "delight."She frequently hangs out with the Gratiae, also known as the Three Graces.

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Volume required to completely react the 0.01 m potassium permanganate  with 0.50 g of hydrogen peroxide solution was 2.94 mL

The volume required can be calculate as follows

first we should write the balance reaction

H₂O₂ + 2KMnO₄→ 2MnO₂ + 2KOH + 2O₂

then we should calculate the moles of hydrogen peroxide (H₂O₂)

moles = mass/ molar mass

moles = 0.50 g / 34 g/ mole

moles= 0.0147 moles

we can use unitary method to calculate the moles of potassium permanganate  

moles potassium permanganate = (2/1) x  moles H₂O₂ = 2/1 x 0.0147 = 0.0294 moles

as we know the moles we can calculate the volume required

V= n/ M

V = 0.0294 moles/ 0.01 = 2.94 mL

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Answer:

Mass of Magnesium Chloride = 26.85 grams

Percentage of Magnesium= 25.5 %

Percentage of Chlorine =74.5 %

Explanation:

Mass of Magnesium Chloride= Mass of magnesium + Mass of Chlorine        6.85 grams + 20.0 grams = 26.85 grams

Percentage of Magnesium = 6.85 grams/26.85 grams x 100% = 25.5%

Hence, Magnesium = 25.5 %

Percentage of Chlorine = (20.0 grams/26.85 grams) x 100 % = 74.5%

Hence, Chlorine = 74.5 %

So, the compound is 25.5 % magnesium and 74.5 % Chlorine by mass.

There are total 3 atoms in MgO, in which 1 atom is of Magnesium and 1 atom is of Oxygen.

Atom

An atom is a particle of matter that uniquely defines a chemical element. An atom consists of a central nucleus that is surrounded by one or more negatively charged electrons. The nucleus is positively charged and contains one or more relatively heavy particles known as protons and neutrons.

Nucleus

The nucleus  is a positively charged region at the center of the atom. It consists of two types of subatomic particles packed tightly together.

The particles are protons, which have a positive electric charge, and neutrons, which are neutral in electric charge.

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Answer:

I don't know because there is no option !!

As a hardening agent, pewter is a tin-based alloy with varying quantities of antimony, bismuth, copper, and lead.  

As a hardening agent, pewter is a tin-based alloy with varying quantities of antimony, bismuth, copper, and lead.

Pewter drinkware maintains liquids at their ideal temperatures for a longer period of time, whether they are hot or cold. A Lovely And Enjoyable Lifetime.

Pewter drinkware maintains liquids at their ideal temperatures for a longer period of time, whether they are hot or cold.

Become familiar with pewter.

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Left ear, right foot, glove, and nail shell are examples of chiral objects; while nail, baseball bat, and wooden spoon are examples of achiral objects.

Chiral objects are not identical in all respects (that is superimposable) with their mirror image.  Chiral objects have a 'handedness', for instance, ears, golf clubs, scissors, feet, hands, gloves, shoes, nail shells, and a corkscrew.

On the other hand, achiral objects are identical with (superimposable on) their mirror image. Achiral objects do not possess a handedness, for instance, a baseball bat (no writing or logos on it), a wooden spoon, a plain round ball, a pencil, a T-shirt, and a nail.

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For some reason my bff think's people also use this website for dating  that is true.

Dating: The 3 Types

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Answer:

beryllium atom

Explanation:

An atom with two protons is always a helium atom. If scientists count four protons in an atom, they know it's a beryllium atom.

The glutamate side chain's gamma carbon is carboxylated by Q1, a vitamin KH2 dependent enzyme, and Q2. A thioester is created when carboxylic acid and coASH interact.

Thioesters are organosulfur compounds having the functional group RSC(=O)R'. By virtue of the thio- prefix, they are implied to be comparable to carboxylate esters (ROC(=O)R'), with the sulphur in the thioester acting as the linking oxygen in the carboxylate ester. Thioesters play a crucial role in metabolism. A notable illustration of this is the metabolism of fatty acids. The main metabolite, acetyl coa, is an ester that is predominantly generated when pyruvate undergoes oxidative decarboxylation or when B acids are broken down.

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Option B. Acetic acid has the formula C2H4O2. In order to distinguish it from its isomers, it is frequently written with CH3CO2.

Then, is CH3COOH a base or an acid. Because the ions in CH 3 COOH do not fully ionise to release H + ions when they are dissolved in water, it is a weak acid. As a result, there are less hydrogen ions in the acetic acid's final solution, which ultimately results in a weak acid.

Since CH3COOH does not release any OH- ions when dissolved in water, it is not an Arrhenius base. According to the Bronsted-Lowry theory for bases, a base is defined as a chemical that absorbs the proton from other molecules and uses it to form a conjugate acid.

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Chemical symbols are used to quickly identify the elements and atoms in a chemical formula and to standardize the "language of science." One or two letters make up chemical symbols, which are most frequently derived from the names of the elements.

Since they show the element's stoichiometric amount, symbols are important. They indicate the number of atoms of a specific element that are being consumed or released during a chemical process.

The 118 chemical elements are included on this list. The element's precise mass in a chemical reaction is represented by the symbol.

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Answer:

3p6 3d4

Explanation:

3d will come after 3p => 3p 3d

p will hold maximum of 6 electrons while d will hold maximum of 10 electrons.

if there are 8 more electrons to 3p2, then 4 will fill 3p so it will become 3p6

then the other 4 will fill 3d to become 3d4

The correct reagent for the given question are as follows:

1) AlCl₃ - CH₃Cl

2) HNO₃ -H₂SO₄ at room temperature

3) Fuming HNO₃ -H₂SO₄ at temperature 90-100 ⁰ C.

In 1st step Benzene is being converted to Toluene .

Benzene is being converted to toluene by the method of Friedel Craft Alkylation of benzene . In this reaction AlCl₃ and CH₃Cl is used as reagent. Electrophile CH³⁺ is produced which is attached on carbon of benzene and the formation of Toluene and HCl occur.

In 2nd step Benzene is being converted to Dinitritoluene .

Dinitritoluene is being prepared from toluene by Nitration. This reaction proceeds by the mechanism of Electrophilic substitution mechanism . HNO₃ and H₂SO₄ are the reagents that are used for the proceeding of reaction at room temperature. These reagents produces NO₂⁺ ( nitronium ion ), which is an electrophile which attacks on C₂ and C₄ Carbon atoms of Toluene.

In 3rd step Benzene is being converted to 2,4,6- trinitrotoluene.

This reaction is the result of extended nitration of the toluene . Further nitration is only can be done in extreme condition . The reaction occurs in the temperature of 90- 100 ⁰ C . Due to rise in temperature there is more production of NO²⁺ ion occurs from HNO₃ - H₂SO₄ and they attack on C6 carbon atom of dinitrotoluene which forms 2,4,6- trinitrotoluene.

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The chemical formula for hydrogen sulfide is H₂S. The mass of hydrogen in 150 g of 141.2 g. Therefore, option A is correct.

A body's mass is an inherent quality. Prior to the discovery of the atom and particle physics, it was widely considered to be tied to the amount of matter in a physical body.

Simply put, mass is a measurement of a body's amount of matter. Matter is everything that has both volume and mass. Although mass cannot be seen, it can be measured or quantified. Not all matter is visible. Typically, mass is expressed in kilograms, etc.

Molar mass of  H₂S

= 1 × 2 + 32

= 34

The mass of hydrogen in 150 g is 141.2 g.

Thus, option A is correct.

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According to the Nerst equation, when Ecell = 0 then : A) Q = K, the nerst equation is then :

log Keq = (n E°) / (0.0592 V)

The Nerst equation is given as follows :

E cell = E°cell  - (0.0592 V / n ) log Q

the electrical potential of the cell is depend on the Q, that reaction quotient of the reaction. at equilibrium ΔG = 0 . the reaction quotient    Q = K and from the equation , ΔG = -nFE , ans E = 0, now the nerst equation is given as :

0 = E° - ( RT / nF ) ln K

0 = E° - ( 0.0592 V / n) log K

log K = (n E°) / (0.0592 V)

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The aldol condensation is a chemical reaction that occurs between a carbonyl compound and an alpha, beta-unsaturated carbonyl compound to form a new carbon-carbon bond, resulting in the formation of a new molecule. This reaction is an example of a crossed aldol reaction because the two starting compounds are not structurally similar.

In the case of cyclopentanone reacting with trans-cinnamaldehyde, the reaction occurs in the following steps:

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