PLEASE SHOW WORK I CANT FIGURE THESE OUT

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Choice 3 would be correct

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Choice 3 would be correct again

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Choice 3

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Yes, This is true

Most of the mass is made of the protons and neutrons.

Answer:

Protons and neutrons

Explanation:

This is a simple answer, but I assure you it is 100% correct and verified.

Hope this helps.

I believe it is called, Density.

Answer : The ratio of the mass of a substance to its volume is called density.

Explanation :

Density : It is defined as the mass of a substance contained per unit volume.

The unit of mass is gram (g) and the unit of volume is milliliter (ml). So, the unit of density is g/ml.

Formula used :

[tex]Density=\frac{Mass}{Volume}[/tex]

For example : If mass of object is 550 grams  and volume of water displaced 25 ml. Calculate the density of an object.

By using formula, we get:

[tex]Density=\frac{550g}{25ml}=22g/ml[/tex]

Thus, density of the object will be 22 g/ml

When an anion forms, more electrons are transferred to it.

Anions are negatively-charged ions that is when an anion forms, more electrons are transferred to it. Anions are common among non metals.

Cations are also called positive ions. Cations are common among metals.

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The correct option is D, as anions are negative ions formed by the transfer of extra electrons to a nonmetal atom, which leads to a negative charge.

The true statement about ions among the options provided is D. When an anion forms, more electrons are transferred to it.

Anions are negative ions formed when a nonmetal atom gains one or more electrons, therefore increasing its number of electrons compared to protons, which results in a negative charge. Nonmetals, especially those in groups 16 and 17 of the periodic table, readily form anions by gaining electrons to achieve the electron configuration of the next noble gas. In contrast, cations are positive ions formed when a metallic atom loses one or more electrons from its valence shell. Therefore, the idea that cations are common among nonmetals is incorrect, as nonmetals typically form anions.

The charge of ions is indeed indicated with a number followed by a plus or minus sign, as stated in option C. However, it is critical to note that the convention is to write the sign first, then the magnitude of the charge.

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Answer:

Chemical equation

                                      HCl +  NH3 ------> NH4Cl

First of calculate the moles of HCl

mole of HCl = Molarity × Vol (L)

mole of HCl = 0.800× 0.018 = 0.014 mole

As the in balance chemical, moles of HCl and NH3 areequal

so

                        moles of NH3= 0.014

                       Molarity of NH3 = moles ÷ V(L) = 0.014/0.005 =  2.88 M

Result:

To find the molar concentration of the ammonia solution, we can use the equation: M1V1 = M2V2. Plugging in the given values, we find that the molar concentration of the ammonia solution is 2.88 M.

To find the molar concentration of the ammonia in the household solution, we can use the equation:

M1V1 = M2V2

where M1 and V1 are the molar concentration and volume of the acid (HCl) solution, and M2 and V2 are the molar concentration and volume of the base (ammonia) solution. Plugging in the given values, we have:

(0.800 M)(18.0 mL) = M2(5.00 mL)

Solving for M2, we find that the molar concentration of the ammonia solution is 2.88 M.

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Hope this helps!! Just always remember it's not that zeros arent important, it's the starting zeros that arent important

So the important numbers is the first number that's between 1-9

Significant figures, also known as sig figs, are a way to express the precision of a measured or calculated value. They help to indicate the number of reliable digits in a measurement or result.

Significant figures, also known as sig figs, are a way to express the precision of a measured or calculated value. They help to indicate the number of reliable digits in a measurement or result. To calculate sig figs, follow these rules:

For example, the number 0.00342 has three significant figures, while 5000 has only one significant figure.

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Answer:- 27.7 grams of [tex]PbI_2[/tex] are produced.

Solution:- The balanced equation is:

[tex]Pb(NO_3)_2+2NaI\rightarrow PbI_2+2NaNO_3[/tex]

let's convert the grams of each reactant to moles and calculate the grams of the product and see which one gives least amount of the product. This least amount would be the answer as the least amount we get is from the limiting reactant.

Molar mass of [tex]Pb(NO_3)_2 = 207.2+2(14.01)+6(16)  = 331.22 gram per mol

molar mass of NaI = 22.99+126.90 = 149.89 gram per mol

Molar mass of [tex]PbI_2[/tex] = 207.2+2(126.90) = 461 gram per mol

let's do the calculations for the grams of the product for the given grams of each of the reactant:

[tex]28.0gPb(NO_3)_2(\frac{1molPb(NO_3)_2}{331.22gPb(NO_3)_2})(\frac{1molPbI_2}{1molPb(NO_3)_2})(\frac{461gPbI_2}{1molPbI_2})[/tex]

= [tex]39.0gPbI_2[/tex]

[tex]18.0gNaI(\frac{1molNaI}{149.89gNaI})(\frac{1molPbI_2}{2molNaI})(\frac{461gPbI_2}{1molPbI_2})[/tex]

= [tex]27.7gPbI_2[/tex]

From above calculations, NaI gives least amount of [tex]PbI_2[/tex], so the answer is, 27.7 g of [tex]PbI_2[/tex] are produced.

Answer:

27.7 g

Explanation:

i got it right on the test

he is a good scientist because he postulated that chemical reactions resulted in the rearrangement of the reacting atoms

Final answer:

John Dalton was a good scientist known for laying the foundation of modern atomic theory in Chemistry. Unlike his predecessors, he backed his theories with experimental evidence. His work in the field earned him considerable honor and influence.

Explanation:

John Dalton was indeed a good scientist, and his work had a profound impact on the field of Chemistry. Not only did Dalton lay the foundations of the modern atomic theory, but he also provided experimental evidence to support his ideas, which differentiated him from earlier philosophers who merely speculated about the nature of matter.

Dalton observed that matter combined in fixed ratios and that chemical compounds always contain the same proportion of elements by mass, a concept supporting the law of definite proportions. It's also worth noting that Dalton was recognized for his work in science with numerous honors, and his influence was significant enough that over 40,000 people in Manchester paid their respects at his funeral.

The correct representation for the subshell with n=2 and l=1 is the '2p' subshell, which has three orbitals, each capable of holding two electrons, for a total of six electrons. This follows the notation where 'n' indicates the principal quantum number, and 'l' (the azimuthal quantum number) determines the subshell type.

The correct representation for the subshell with n=2 and l=1 is the 2p subshell. In the notation used for electronic configurations, 'n' represents the principal quantum number, which corresponds to the principal shell, and 'l' represents the azimuthal quantum number, which corresponds to the subshell. Since 'l' is equal to 1, we refer to the subshell with the letter 'p'. As such, the entire designation becomes '2p', with the number '2' denoting the principal shell and 'p' denoting the type of subshell.

It is important to note that each principal shell has 'n' subshells. Therefore, with n=2, there are two subshells available which are 2s and 2p. The 2p subshell is allowed because n ≥ 2, while a 2d subshell would not exist since a 'd' subshell begins with n=3.

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1) Answer is: there are 9.04 moles of the hydrogen in 4.52 mol of the water.

n(H₂O) = 4.52 mol; amount of the water molecules.

In one molecule of the water, there are two hydrogen atoms.

n(H₂O) : n(H) = 1 : 2.

n(H) = 2 · n(H₂O).

n(H) = 2 · 4.52 mol.

n(H) = 9.04 mol; amount of the hydrogen atoms.

2) Answer is: there are 25.29 moles of the hydrogen in 8.43 mol of the ammonia (NH₃).

n(NH₃) = 8.43 mol; amount of the ammonia molecules.

In one molecule of the ammonia, there are three hydrogen atoms.

n(NH₃) : n(H) = 1 : 3.

n(H) = 3 · n(NH₃).

n(H) = 3 · 8.43 mol.

n(H) = 25.29 mol; amount of the hydrogen atoms.

3) Answer is: there are 0.408 moles of the hydrogen in 0.102 mol of the hydrazine (N₂H₄).

n(N₂H₄) = 0.102 mol; amount of the hydrazine molecules.

In one molecule of the hydrazine, there are four hydrogen atoms.

n(N₂H₄) : n(H) = 1 : 4.

n(H) = 4 · n(N₂H₄).

n(H) = 4 · 0.102 mol.

n(H) = 0.408 mol; amount of the hydrogen atoms.

4) Answer is: there are 770 moles of the hydrogen in 35.0 moles of the decane (C₁₀H₂₂).

n(C₁₀H₂₂) = 35.0 mol; amount of the decane molecules.

In one molecule of the decane, there are twenty two hydrogen atoms.

n(C₁₀H₂₂) : n(H) = 1 : 22.

n(H) = 22 · n(C₁₀H₂₂).

n(H) = 22 · 35.0 mol.

n(H) = 770 mol; amount of the hydrogen atoms.

For H2O, NH3, N2H4 and C10H22, the respective numbers of moles of Hydrogen are: 9.04, 25.29, 0.408, and 770.

To determine the number of miles of Hydrogen (H) in each sample, we first need to recognize that in each molecule of H2O there are two atoms of hydrogen, in each molecule of NH3 there is three atoms of hydrogen, in each molecule of N2H4 there are four atoms of Hydrogen and in each molecule of C10H22 there are twenty-two atoms of Hydrogen.

Then, to get the number of moles of Hydrogen you multiply the number of moles of the compound by the number of hydrogen molecules in that compound. For example, for H2O, you have 4.52 moles * 2 = 9.04 moles of H.

Therefore, for H2O, NH3, N2H4 and C10H22, we have:

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Answer:

The possible values are l={0,1}

Explanation:

Hi,the possible values that the Azimuthal number (l) are given by the value of the Principal quantum number (n) of the atomic level you are in:

[tex] l=[0;n-1][/tex]

In this case:

For [tex]n=2 \longrightarrow n-1=2-1=1[/tex]   so l values will be 0 and 1

This different values  the Azimuthal numbar can have, determine the different types of sublevels that atomic level has.

For example:

Since a water molecule is H2O, you would divide 126 hydrogen molecules by 2, and you would get 63. That means you have 63 double hydrogen molecules, and 58 oxygen molecules to pair up with them. So that means you could have 58 molecules of water, with 5 double hydrogen molecules, so basically 10 extra molecules of hydrogen along with the H2O molecules. Hope I helped! :)

Answer : The number of moles of water formed can be 116 moles.

Explanation :

First we have to calculate the limiting and excess reagent.

The balanced chemical reaction will be:

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

From the balanced chemical reaction we conclude that,

As, 1 mole of [tex]O_2[/tex] react with 2 mole of [tex]H_2[/tex]

So, 58 moles of [tex]O_2[/tex] react with [tex]58\times 2=116[/tex] moles of [tex]H_2[/tex]

From this we conclude that, [tex]H_2[/tex] is an excess reagent because the given moles are greater than the required moles and [tex]O_2[/tex] is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of [tex]H_2O[/tex]

From the reaction, we conclude that

As, 1 mole of [tex]O_2[/tex] react to give 2 mole of [tex]H_2O[/tex]

So, 58 moles of [tex]O_2[/tex] react to give [tex]58\times 2=116[/tex] moles of [tex]H_2O[/tex]

Therefore, the number of moles of water formed can be 116 moles.

Answer:C

Explanation:

The correct answer is exactly 750 g.

Since the mass of board is 750 g, the mass of the pile of sawdust after the whole board is ground down is 750 g.

This is according to the Law of conservation of mass. According to this law, matter can neither be created nor destroyed by any  physical transformations or chemical reactions. In any chemical reaction the mass of the products is equal to the mass of the reactants.

Here the board undergoes a physical transformations from being a whole board to a pile of sawdust. Thus according to the Law of conservation of mass, the mass of the whole board will be equal to the mass of a pile of sawdust.

The answer is 750 grams

D. 0.044 m3

hope this helped

Answer:

D. 0.044 m3

Explanation:

took test

A suspension of the liquid droplets or the solid particle under pressure is called aerosol. When the temperature is increased then, pressure will increase proportionally.

The aerosols are colloidal substances under pressure that gets released as fine particles of spray in the air. They also follow the law of the ideal gas equation.

According to the law, the factors pressure and volume are directly proportional to the number of the moles, and the temperature of the ideal gas of the system.

When the temperature of the aerosol can is heated and raised from 22 to 110 then the pressure of the can will increase in proportion to the temperature as, [tex]\rm P \alpha T[/tex].

Therefore, option D. pressure increases proportionately to the temperature.

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a) Carbon and oxygen are chemically bonded in carbon dioxide.

The elements lose their individual identities in CO₂, and they always combine o the proportion C:O = 1:2.

You cannot separate the elements from each other by physical means.

Final answer:

Carbon dioxide is composed of carbon and oxygen chemically bonded by two double covalent bonds, forming a new substance that cannot be separated by physical methods and displays a constant proportion of carbon to oxygen across all samples.

Explanation:

Among the statements provided about carbon dioxide, the correct one is that carbon and oxygen are chemically bonded in it. Carbon dioxide is a chemical compound made up of one carbon atom and two oxygen atoms, and these are joined by two double covalent bonds, represented by the chemical formula O=C=O. This structure means that the carbon and oxygen atoms do not retain their original identity within the compound; they form a completely new substance with different properties. Moreover, this compound cannot be separated into its constituent elements using physical methods; chemical reactions would be required to break these bonds. Additionally, in a large sample of carbon dioxide, the proportion of carbon to oxygen remains constant because molecular compounds consist of identical molecules.

The existence of coal beds in antarctic means the presence of trees and plants 35 million and 55 million years ago.

False

Although we use many of their ideas to describe atoms today, such as the existence of a tiny, dense nucleus in an atom (proposed by Rutherford), or the notion that all atoms of an element are identical (proposed by Dalton), some of their ideas have been rejected by the modern theory of the atom.

For example, Thompson came up with the plum pudding model to describe an atom, which resembled a sphere of positive charge with electrons embedded in it. We know now, however, that atoms are mostly empty space with a tiny, dense nucleus.

Another example is Dalton's atomic theory, which stated that atoms are indivisible particles. However, this was disproved by the discovery of subatomic particles.

Answer:

Its false

Explanation:

Poor electrical conductors like glass, plastic, wood, etc. conduct heat mainly through vibrations among the molecules. As molecules vibrate, they bump into their neighbors from time to time, transferring some of their energy (i.e. heat). Those neighbors then bump in to some of their neighbors on the other side and transfer some of the energy to them. The process continues, and the heat is transferred through the material, but it happens quite slowly because the molecules are mostly stuck in place (because they're part of a solid material. If they were liquid or gas, they could move around more freely and transport heat more quickly. That process is called convection, rather than conduction). Anyway, metals and other good electrical conductors have the ability to transfer energy through an additional mechanism. In this case, the vibrating molecules literally shake off some of their weakly-bound electrons (which are plentiful in metals and all other good electrical conductors). These high-energy electrons then fly away and bump into other molecules or electrons, transferring the heat. Unlike entire vibrating molecules, however, individual electrons are so small that they can travel much longer distances at much, much higher speeds before they bump into anything. (It's sort of like shooting a gun in a forest. The bullet may travel several hundred feet or more before it actually strikes a tree. If you tried to drive a bus in that same forest, however, you couldn't go more than a few feet without running into something) Hope this helps :)

Metals are good conductors of both electricity and heat due to the presence of free electrons that facilitate energy transfer, resulting in high thermal conductivity. Nonmetals are generally poor heat conductors and are considered insulators because they lack these free electrons, which causes them to transfer heat much slower.

The ability to conduct heat distinguishes metals from nonmetals. Metals like copper, aluminum, and silver are good conductors of electricity and, correspondingly, are also good thermal conductors. The thermal conductivity of metals can largely be attributed to the presence of free electrons that facilitate the transfer of energy as heat.

Nonmetals, on the other hand, typically have a lower thermal conductivity and are considered insulators. Materials such as wood, plastic, and rubber have a limited ability to conduct heat, causing them to be inefficient at transferring thermal energy compared to metals.

The difference is so notable that touching a metal object and a nonmetal object at the same temperature often results in the metal feeling colder due to its rapid heat conduction away from the hand. This property of metals is because they allow energy to flow more quickly throughout the material, whereas nonmetals like paper and Styrofoam conduct energy so slowly that they appear to maintain warmth for longer periods.

A thing used to tie something or to fasten things together.

"she brushed back a curl that had strayed from its bonds"

OR

An agreement with legal force, in particular.

Any of several forces, especially the ionic bond, covalent bond, and metallic bond, by which atoms or ions are bound in a molecule or crystal.

The general properties of solids reflect the orderly arrangement of their particles and the fixed locations of their particles.

Final answer:

The structure of solids, whether crystalline, amorphous, or metallic, dictates their properties such as melting points, hardness, thermal conductivity, electrical conductivity, malleability, ductility, elasticity, and strength.

Explanation:

The structure of solids is intimately linked to their properties. The arrangement of atoms, ions, or molecules in a solid determines how the solid will interact with its environment. For instance, a solid with a crystalline structure, where the particles are arranged in a highly ordered pattern, typically has distinct melting and boiling points.

Materials like diamond, with a rigid lattice structure, have high hardness and high thermal conductivity because of the strong covalent bonds holding the carbon atoms in place. In contrast, amorphous solids like glass lack a long-range order, resulting in different physical properties, such as varying melting points and lower thermal conductivity.

In metals, the structure is characterized by a metallic bonding where electrons are delocalized, allowing them to conduct electricity and heat efficiently. Additionally, the arrangement of atoms within metals allows them to deform under stress without breaking, giving them malleability and ductility.

Moreover, polymers have structures that range from crystalline to amorphous, determining their elasticity, strength, and plasticity. For example, the highly ordered structure of Kevlar makes it incredibly strong, while the less ordered structure of rubber makes it flexible and stretchy.

Thus, understanding the relationship between structure and properties is essential in material science for predicting and explaining the behavior of different materials.

Diameter of the wire = 0.080 mm

Weight of wire per km = 44.5g  

Weight of wire used to wind a magnet = 600 g

Therefore, length of the wire used:

600 g x 1 km/ 44.5g = 13.48 km

The length of the wire used was 13.48 km .

The length of  wire that was used is 13.48km

You could  calculate how much wire was used by dividing the wire weight  in g by the wire  weight in per gkm

Length of wire used =Weight of wire in g/

Weight of wire per gkm

Let plug in the formula

Length of wire used=600.g/44.5/gkm

Length of wire used=13.48km

Inconclusion The length of  wire that was used is 13.48km

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Answer:

The correct answer would be cytokinesis.

Cytokinesis is the part of the cell cycle which takes place after telophase of mitosis.

It is the phase during which the cytoplasm or cellular contents of a parent cell are divided into the two daughter cells.

In animal cells, cytokinesis is achieved by cleavage furrow formation whereas, in plant cells, it is achieved by cell plate formation.

When you put a popsicle mold in the fridge, the mold is in a liquid state. Therefore, when it is frozen it turns into a solid state. When you are trying to figure out these types of scenarios you can always ask this question. Can the object go back to its original form? For example, if you burn wood you can't bring it back to the way it was before you burned it. Therefore, since you can't bring it back, it is a chemical change. In this case however, you CAN bring it back. If you freeze the popsicle mold, it will be made of the same stuff, just in a different state of matter. If you put the popsicle outside and keep it in the mold, then it will turn back into the liquid state. Since in this case, you can change it back and forth, it is a physical change.

Placing popsicle molds in the fridge is classified as a physical change because it alters the state of the substance (from liquid to solid) without changing the substance's identity.

Putting popsicle molds in the fridge is an example of a physical change rather than a chemical change. Physical changes are temporary and reversible, involving alterations to states of matter without changing the substance’s identity. Freezing a liquid into a solid does not alter the nature or identity of that substance, in this case, the popsicle mix. However, a chemical change would involve the composition of the substance being altered, which doesn't occur when popsicle molds are put in the fridge to freeze. So, we conclude that when popsicle molds are placed in the fridge, it causes a physical change, not a chemical change.

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The Bohr model describes the arrangement of electrons in atoms. In magnesium, electrons orbit the nucleus in shells, influencing its reactivity. Sodium's Bohr model explains its outer electron's reactivity, useful in cloud seeding. Both models contribute to understanding atomic structure and behavior.

1. The Bohr model for magnesium involves electrons orbiting the nucleus in quantized energy levels or shells. Magnesium has 12 electrons, with the first two in the innermost shell and the remaining 10 distributed in the subsequent shells. The electrons occupy specific orbits, and transitions between these orbits result in the absorption or emission of energy. The outermost shell, containing two electrons, is not fully filled, making magnesium a reactive metal. The production of uranium involves magnesium compounds acting as reducing agents in various steps.

2. In the Bohr model for sodium, electrons are arranged in shells around the nucleus. Sodium has 11 electrons, with two in the innermost shell and the remaining nine in the outer shell. The outer shell has a single electron in a subshell that is easily lost, leading to sodium's high reactivity. Cloud seeding with sodium salts involves releasing sodium ions into clouds, promoting the coalescence of water droplets and enhancing rainfall. The Bohr model helps explain the electronic configuration and reactivity of sodium.

The composition is 25.1 % C, 4.22 % H, 9.79 % N, 49.7 % Cl, 11 % O.

We must calculate the masses of C, H, N, Cl, and O from the masses given.

Mass of C in 150 mg X =138 mg CO₂ × (12.01 mg C/44.01 mg CO₂) = 37.66 mg C

Mass of H in 150 mg X = 56.6 mg H₂O × (2.016 mg H/18.02 mg H₂O) = 6.332 mg H

Mass of N in 200 mg X = 23.8 mg NH₃ × (14.01 g N/17.03 g NH₃) = 19.58 mg N

Mass of N in 150 mg X = 19.58 mg N × (150 mg X/200 mg X) = 14.68 mg N

Mass of Cl in 125 mg X = 251 mg AgCl × (35.45 mg Cl/143.32 mg AgCl) = 62.08 mg Cl

Mass of Cl in 150 mg X = 62.08 mg Cl × 150 mg /125 mg X) = 74.50 mg Cl

Mass of O in 150 mg X = (150 – 37.66 -6.332 -14.68 – 74.50) mg = 16.8 mg

% C  = 37.66 mg/150 mg × 100 % =   25.1    %

% H  = 6.332 mg/150 mg × 100 % =     4.22 %

% N  = 19.58 mg/200 mg × 100 % =     9.79 %

% Cl = 62.08 mg/125 mg × 100 %  =  49.7   %

% O  = 16.8 mg/150 mg × 100 %     =   11       %

                                           TOTAL = 100      %

Covalent bonds only form when electrons are shared between two nonmetals.

The two atoms which have low electronegativity difference that is they are non metals can form a covalent bond.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules. Non metals have low electronegativity difference  and can easily form covalent bond.

Thus,non metals have low electronegativity difference  and can easily form covalent bond.

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When the wind or water removes soil rock or dissolved material from one location to another

Erosion is the process where materials are moved from one place to another, it can be caused my water, wind, or other natural agents. it can also wear down the material in the process.

Answer:

The given statement is True

Explanation:

Calcium, carbon dioxide, and water combine to form calcite. Calcite is a mineral that is composed of calcium carbonate (CaCO3). The chemical reaction that occurs when calcium, carbon dioxide, and water react together to form calcite is called a precipitation reaction.