calculate the linear packing factor (i.e. lpf) of the [100] direction in a metallic bcc crystal structure

Answer:

1. Metals on the right have more protons, causing valence electrons to be held more strongly.

2. by gaining electrons

3. They are very nonreactive.

4. Cs and Br

5. Rb loses an electron.

Explanation: taken it before

The unique feature of Group 18 nonmetals is that they have more exceptions to reactivity rules.

Nonmetals are defined as the natural materials that are structurally brittle and do not generate heat or electricity.

It is also defined as a chemical element with no metallic properties that ranges from colorless gases to shiny, high-melting-point solids.

They are non-malleable and ductile in nature.

Reactivity is defined as the proclivity of a substance to undergo chemical reaction and release energy, either by itself or in conjunction with other materials.

Reactive rules are used in the programming of rule-based, reactive systems that can detect events and respond to them automatically and in a timely manner.

Thus, the unique feature of Group 18 nonmetals is that they have more exceptions to reactivity rules.

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The value of Y in the formula when 2.8g of silicon react with 3.2g of oxygen, is 2

The numbers in the formula of a compound determine the ratio of moles of each element in the compound.

Given:

2.8g of silicon

3.2g of oxygen

[relative atomic mass of silicon is 28 and of oxygen is 16]

For silicon, n = 2.8 ÷ 28 = 0.1    (n= moles)

For oxygen, n = 3.2 ÷ 016 = 0.2

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.1 moles.

For Silicon = 0.1/0.1 = 1

For Oxygen = 0.2/0.1 = 2

Taking the mole ratio as their subscripts.

The ratio of Si:O is 1:2

SiO\(_{2}\) is the formula of silicon dioxide.

The value of y in the formula SiO\(_{Y}\) is 2 when 2.8g of silicon react with 3.2g of oxygen.

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Taking into account the Gay-Lussac's law, the new pressure of the chamber is 569.295 kPa.

Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of shocks against the walls increases, that is, the pressure increases.

That is, the gas pressure is directly proportional to its temperature: when there is a constant volume, as the temperature increases, the gas pressure increases, and when the temperature decreases, gas pressure decreases.

Gay-Lussac's law can be expressed mathematically as follows:

P÷T= k

Considering an initial state 1 and a final state 2, it is fulfilled:

P₁÷T₁= P₂÷T₂

In this case, you know:

Replacing in Gay-Lussac's law:

450 kPa÷ 298 K= P₂÷ 377 K

Solving:

(450 kPa÷ 298 K)× 377 K= P₂

569.295 kPa= P₂

Finally, 569.295 kPa will be the new pressure.

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1. The type of polymer that would you obtain if sorbitol is a polyol.

2a. The use of starch-borate and starch-glycerol polymers for the encapsulation of pharmaceutical drugs or pesticides would have a number of beneficial effects.

2b. Yes, these polymers are considered to be biodegradable.

1. The type of polymer that would you obtain if sorbitol (a sugar alcohol found in sugar-free gum) was used as a plasticizer additive is a polyol. This is because sorbitol is a polyol, which is a substance used to modify the properties of polymers. The process of polymer modification involves adding polyols to the polymer matrix, which helps to reduce the glass transition temperature of the polymer. Sorbitol can be used as a plasticizer addictive because it is a natural and non-toxic compound that is biodegradable.

2a. The use of starch-borate and starch-glycerol polymers for the encapsulation of pharmaceutical drugs or pesticides would have a number of beneficial effects. These polymers are natural and non-toxic, and they are biodegradable, which means that they do not pose a risk to the environment. Additionally, they can be used to modify the properties of the drugs or pesticides, making them more effective and reducing their toxicity.

2b. Yes, these polymers are considered to be biodegradable. This is because they are made from natural materials that can be broken down by biological processes. Starch-borate and starch-glycerol polymers are particularly attractive for use in biodegradable materials because they are non-toxic and biocompatible. They can be used in a variety of applications, including packaging materials, agricultural films, and medical devices, where their biodegradability is an important factor.

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Answer:

C

Explanation:

75 mile shallow flat area just off coastlines

In the biosynthetic pathways for the synthesis of heme, creatine, and guanine, Glycine amino acids directly provides carbon atoms that appear in the final product.

a member of the class of organic molecules known as amino acids, each of which is composed of an acidic carboxyl group (COOH), a basic amino group (NH2), and a unique organic R group (or side chain). Informally, an amino acid is alpha-amino [alpha-amino] carboxylic acid. Every molecule has an amino group and a carboxyl group attached to the central carbon (C), also known as the -carbon. The final two bonds of the -carbon atom are typically filled by a hydrogen (H) atom and a R group. One way to classify standard (or common) amino acids is based on the polarity (i.e., the distribution of electric charge) of the R group (e.g., side chain).

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Answer:

1/32

Explanation:

Answer:

mutual relationship

Explanation:

pls mark brainliest

The difference between the molecular orbital (MO) theory and the valence bond (VB) theory is MO theory considers the formation of molecular orbitals by linear combination of atomic orbitals, while VB theory focuses on localized bonding due to the overlap of atomic orbitals, highlighting the geometrical arrangement of bonds in molecules

Molecular orbital theory is a method that describes the electronic structure of molecules by combining atomic orbitals to form molecular orbitals, which are delocalized over the entire molecule. This theory focuses on the formation of new orbitals from atomic orbitals and gives insight into the distribution of electron density, bond order, and magnetism of the molecule.

On the other hand, valence bond theory is based on the idea that atomic orbitals of individual atoms overlap to form bonds between the atoms, this theory emphasizes the localized nature of bonding, where electrons are shared between two specific atoms. It explains the bonding in terms of hybridization of atomic orbitals and their orientation in space.

In summary, MO theory considers the formation of molecular orbitals by linear combination of atomic orbitals, providing a more global view of bonding, while VB theory focuses on localized bonding due to the overlap of atomic orbitals, highlighting the geometrical arrangement of bonds in molecules. Both theories are essential for understanding the electronic structure and properties of molecules.

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By mixing the chemicals.

Answer:

A chemical reaction can be sped up by many factors. Add a catalyst (A substance that reduces activation energy, speeding up the reaction) Increase the concentration of reactants. Increase the concentration of catalysts.

The total mass of the items is 853.8 g, according to the solution.

We are aware that in order to determine the mass of the products and the overall mass of the products produced by the reaction, the stoichiometric principles must be applied.

The answer to the question states that 496. 5 grammes of lead II nitrate react with potassium bromide in a way that the lead II nitrate is totally consumed in the reaction. This indicates that the lead II nitrate is the reaction's limiting reactant.

Number of lead II nitrate moles

= 496. 5 grams /331 g/mol

= 1.5 moles

If 1 mole of  lead II nitrate produces 1 mole of lead II bromide

Mass of lead II bromide produced

= 1.5 moles * 367 g/mol

= 550.5 g

If 2 moles of potassium nitrate are created from 1 mole of lead II nitrate

1.5 moles of lead II nitrate produces

=  1.5 * 2 /1

= 3 moles of  potassium nitrate

Mass of  potassium nitrate

= 3  moles * 101.1

= 303.3 g

Total mass produced

= 550.5 g + 303.3 g

= 853.8 g

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The reagent that readily reacts with bromobenzene without heating is: sodium cyanide (NaCN)/DMSO.

Sodium cyanide (NaCN) in DMSO readily reacts with bromobenzene (C6H5Br) to produce benzonitrile (C6H5CN) and NaBr. DMSO is a solvent that can dissolve both organic and inorganic compounds, making it an ideal choice for the reaction.
NaCN + C6H5Br → C6H5CN + NaBr

The other reagents mentioned in the question may react with bromobenzene but require heating to initiate the reaction. Sodium ethoxide (NaOCH2CH3), for example, can react with bromobenzene to form phenylethene, but heating is required.

Sodium amide (NaNH2) in liquid ammonia (NH3) is a strong base that can deprotonate bromobenzene to form phenylsodium. However, heat is required to initiate this reaction. N,N-dimethylaniline ((CH3)2NH) is an organic base that may react with bromobenzene, but it is unlikely to produce a significant yield.

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Answer:a element

Explanation:

Answer:

310.15 Degrees Kelvin

Explanation:

37 Degrees Celsius = 310.15 Degrees Kelvin = 98.6 Degrees Fahrenheit

Conversion Factor from Celsius to kelvin

or 37 + 273 = 310 Degrees Kelvin

The correct order of the four compounds in increasing Rf values on the TLC plate is: A. chlorobenzene, 1-chloro-4-nitrobenzene, 1-chloro-2,4-dinitrobenzene, 1-chloro-2,6-dinitrobenzene

In thin-layer chromatography (TLC), the Rf value (retention factor) is used to compare the migration of compounds on the plate. The Rf value is influenced by the polarity of the compound and the polarity of the solvent mixture. More polar compounds will have lower Rf values, while less polar compounds will have higher Rf values.

The solvent mixture used in this question is 8:1 hexanes/ethyl acetate, which is relatively non-polar.

1. Chlorobenzene is the least polar compound, as it only has a chlorine atom attached to the benzene ring.
2. 1-chloro-4-nitrobenzene has one nitro group, which increases its polarity compared to chlorobenzene.
3. 1-chloro-2,4-dinitrobenzene has two nitro groups, making it more polar than 1-chloro-4-nitrobenzene.
4. 1-chloro-2,6-dinitrobenzene also has two nitro groups, but the presence of the two nitro groups at the 2,6 positions makes it more polar than 1-chloro-2,4-dinitrobenzene.

As the Rf values increase with decreasing polarity, the correct order is A. chlorobenzene, 1-chloro-4-nitrobenzene, 1-chloro-2,4-dinitrobenzene, 1-chloro-2,6-dinitrobenzene.

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Answer:

shell ,orbit , this is the answer of this qn

The words that complete these descriptions are law, hypothesis, and experiment.

In science, a law is a statement that accurately describes the way a natural phenomenon occurs. Due to this, laws are created after testing a hypothesis several times. This matches Jean-Baptiste's proposal because his idea about heat flow has been tested by himself and others multiple times.

Different from a law, a hypothesis only states a possible explanation but this should be tested to become a law. This concept can be applied to Sadi because he only has an idea about heat flow but this has not been tested.

This is a procedure that aims at testing a hypothesis. This concept applies to James because he is carrying out an objective procedure to understand energy and heat.

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Answer:

the breaking down of rock is known as weathering

Answer:

1.A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B.

Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.

Answer:

See explanation

Explanation:

Matter may exist in three phases; solid, liquid and gas. The state in which matter exists depends on the extent of intermolecular forces operating in the substance.

In solid particles, the molecules that compose the solid are close together because the molecules of a solid do not move from place to place but they continue to vibrate about their fixed position.

For liquids, the molecules that compose a liquid are in random motion but are less energetic than molecules of a gas.

In gases, the molecules are not held together at all. The molecules of a gas have the highest degree of freedom. They move from one point another at a high velocity.

Hence, the order of increasing degree of movement of the particles in different states of matter = solids<liquids< gases.

Solids have well arranged particles, the molecules of a liquid are a little more disorderly than liquid particles while gas particles are the most disorderly of all the states of matter.

Answer:

All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.

hope this helps

Explanation:

Elements in the same period are those that are in a single horizontal line from left to right. They do not share the same type of chemical reactivity as seen in groups. They only real thing that these elements share in common is the same principal quantum number, or main energy shell.

The solution prepared by the adding the 2.70 g of acetic acid to the 122.8 g of the water . the percent by mass of the acetic acid in solution is  2.15 %.

given that :

mass of acetic acid = 2.70 g

mass of the water = 122.8 g

the mass of the solution = 2.70 g + 122.8 g

                                        = 125.5 g

the percent by mass of the acetic is given below :

percent by mass  =( mass of the acetic acid / mass of solution ) × 100 %

percent by mass = (2.70 / 125.5 ) × 100 %

percent by mass = 2.15 %

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Answer:

the first one

Explanation:

neutrons only have neutral charges and electrons are not heavier than protons

The subatomic particles are the indivisible particles present in an atom. A neutron carries a neutral charge and mass greater than the mass of an electron. Thus, option A is correct.

Subatomic particles are present in an atom and are the smallest unit that makes the atom. It comprises neutrons, electrons, and protons. The protons have the greatest mass and a positive charge.

The electrons are the particles said to carry a negative charge and a relative mass smaller than a proton and neutron. They are found in the shells present outside the nucleus.

The neutrons are said to have a relative mass of as same as the proton and greater than an electron. It does not carry any charge and is neutral. It is present inside the nucleus along with protons.

Therefore, option A. neutrons have a larger mass than electrons.

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Argon is a monoatomic gas because it has a completely filled outer shell of electrons, making it very stable and nonreactive with other elements.

CaO has ionic bonding, CO2 has covalent double bonding, and NH3 has covalent triple bonding.

Every molecule has a definite geometry because of the arrangement of its atoms in space, which is determined by the number of electron pairs around the central atom and the repulsion between them.

Water molecules remain associated in liquid water due to hydrogen bonding, which is a strong intermolecular force between the positively charged hydrogen atom of one water molecule and the negatively charged oxygen atom of another.

Atoms combine to form molecules in order to achieve a more stable electron configuration and lower their potential energy.

The necessary conditions for the formation of a covalent bond include two atoms with similar electronegativities sharing a pair of electrons to fill their outer electron shells.

He2 is not formed because helium is a noble gas with a completely filled outer shell of electrons, making it highly stable and nonreactive with other elements.

M and X should have a large difference in electronegativity in order to form a predominantly ionic compound, with M being a metal and X being a nonmetal.

An electrovalent bond, also known as an ionic bond, is formed by the transfer of electrons from a metal to a nonmetal. Necessary conditions for the formation of an ionic bond include a large difference in electronegativity between the two elements and a stable octet for both elements. Examples of ionic compounds include NaCl and MgO.

HCl gas is a covalent compound, but its aqueous solution can conduct electricity because it ionizes in water to form H+ and Cl- ions.

The melting point of electrovalent compounds is higher than the melting points of covalent compounds because of the stronger electrostatic attraction between oppositely charged ions in the crystal lattice.

In metals, the atoms are held together by metallic bonding, which is a combination of electrostatic attraction between positively charged metal ions and a sea of delocalized electrons.

NaCl is a better conductor in the molten stage than in the solid state because the ions are free to move and carry an electric current in the liquid phase, whereas, in the solid phase, they are fixed in position and cannot conduct electricity.

The electron dot representation of ethane shows two carbon atoms sharing a single bond and each bonded to three hydrogen atoms. The electron dot representation of carbon tetrachloride shows a central carbon atom bonded to four chlorine atoms through single covalent bonds and has no unpaired electrons.

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Answer:

121 aprox.

Explanation:

mass/molar mass = Q/CF

where mass=?

molar mass of Al=27

Q=It = 15×24×60×60

C=3

F=96500

Answer:

i fond nothing sooory

pic so PC

Option (c) is correct. CO2 gas have density at STP greater than that of Argon. This is determined by ideal gas law, PV = n RT.

According to the Ideal gas law, the pressure times the volume of a gas divided by the number of moles and temperature of the gas is always equal to a constant number. The numerical value of the constant depends on which units the pressure volume and temperature are in

  PV = n RT

at STP, P is constant and T is constant.

so, V = km / M

so, the density is greater with the molar mass. so, density of CO2 is greater than argon as it has the molar mass of 44.01 g/ mole and argon has 39.148 g/ mole. Density is defined as the mass per unit volume of a material substance.  Density is commonly expressed in units of grams per cubic centimeter.

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Explanation:

When the gymnast is standing straight up, gravity acts on the gymnast but the gymnast is able to stay relatively stable.Tihis happens because her center of mass is directly above the beam which means that gravity is pushing her down onto the beam.