Which of the following is not present in skeletal structures?
A.The chemical symbol for carbon
B.The chemical symbol for hydrogen
C.Bonds
D. A and B

Answer:

Acidic

Explanation:

the pH scale ranges from 0 to 14, where 7 means the substance is neutral. Less than 7 means the substance is Acidic. Greater than 7 means the substance is Basic.

Remember that the lower the pH is, the more Acidic the substance is. In this case lemon juice is Acidic.

This increased energy causes the molecules to move more rapidly, which in turn increases the volume of the substance. As the volume of the substance increases, its density decreases because the same amount of matter is spread out over a larger volume.

The density decreases as the temperature increases because the molecules lose energy and slow down, so the same number of molecules occupy less space. This happens because the increase in temperature causes the molecules to move more rapidly, increasing the space between them. The density of a substance is defined as its mass per unit volume. The density of a substance depends on its temperature, as well as its pressure and composition. As the temperature of a substance increases, the kinetic energy of its molecules also increases. This increased energy causes the molecules to move more rapidly, which in turn increases the volume of the substance. As the volume of the substance increases, its density decreases because the same amount of matter is spread out over a larger volume.

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a. rusting

the others are physical change, not chemical

Answer:

Covalent

Explanation:

Covalent is the sharing of electrons and Ionic is transferring of electrons.

Answer:

Covalent bonds

Explanation:

the interatomic linkage that results from the sharing of an electron pair between two atoms

Answer:

metal atoms lose electrons to form positive ions (cations ) non-metal atoms gain electrons to form negative ions (anions )

i agree with this answer from the person above me: Augustlonley

Explanation:

*throws leaves in his face* Hey you wake up!!

Answer:

81.6%

Explanation:

mass of acetylferrocene and ferrocene mixture = 22.092 g

mass ratio acetylferrocene and ferrocene mixture = 1 : 1

The sum of the ratios = 2, therefore the mass of each compound will be half the mass of the mixture

mass of each compound in the sample mixture = 1/2 * 22.09 2= 11.046 g

mass of recovered acetylferrocene = 9.017 g

percentage recovery = mass recovered/mass in sample * 100%

percentage recovery of acetylferrocene = (9.017 g / 11.046 g) * 100%

percentage recovery of acetylferrocene = 81.6%

Answer:

Pupa Stage

Explanation:

Silk worm consists of four stages- the adult, the egg, the larva (caterpillar) and the pupa stage.

To determine the approximate number of atoms of copper present in one mole of copper, we need to use Avogadro's number, that one mole of substance contains 6.022 × 10^23 entities (atoms, molecules, or ions).

Given that one mole of copper has a mass of 63.5 grams, which corresponds to the molar mass of copper (Cu), we can use this information to calculate the number of moles of copper.

Number of moles of copper = Mass of copper / Molar mass of copper

Number of moles of copper = 63.5 g / 63.5 g/mol = 1 mol

Since one mole of any substance contains Avogadro's number of entities, one mole of copper will contain approximately 6.022 × 10^23 atoms of copper. Therefore, approximately 6.022 × 10^23 atoms of copper are present in one mole of copper.

A mole is the amount of a substance that has the same number of particles (Avogadro's number, which is 6.022 * 1023) as are present in 12.000 grammes of carbon-12 of the substance. A mole can contain any number of atoms, molecules, or ions.

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The answer in correct number of significant figures should be reported as 4.6.

When performing calculations, it is important to consider significant figures to maintain the appropriate level of precision in the result. In this case, the division operation introduces additional uncertainty.

Starting with the given numbers:

249.362 (6 significant figures)

41 (2 significant figures)

63.498 (5 significant figures)

Performing the calculation:

249.362 + 41 / 63.498 = 249.362 + 0.646703 = 249.362 + 0.6 (rounded to one decimal place)

The addition requires consistent decimal places, so the result is rounded to the nearest tenth, which is 0.6. Adding this to the whole number:

249.362 + 0.6 = 249.962

To report the final answer with the correct number of significant figures, we round to the nearest tenth:

249.962 ≈ 250.0

When expressed with one decimal place, the result is 4.6.

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Answer:

To determine the number of atoms in 0.28 moles of Beryllium (Be), we need to use Avogadro's number, which is 6.022 x 10^23 atoms per mole.

First, we can calculate the number of moles of Beryllium (Be) in 0.28 moles by multiplying it by Avogadro's number:

0.28 moles x 6.022 x 10^23 atoms/mole = 1.68496 x 10^23 atoms

Therefore, there are approximately 1.68 x 10^23 atoms in 0.28 moles of Beryllium (Be).

Explanation:

The periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic number, electron configurations, and chemical properties. The elements are arranged in rows and columns according to their atomic number, which is the number of protons in the nucleus of an atom of that element. There are currently 118 known elements in the periodic table.

The elements in the periodic table are divided into several groups and periods. The groups, also known as families, are vertical columns on the periodic table and are labeled with numbers from 1 to 18. These groups have similar chemical properties and reactivity. For example, the elements in group 1, the alkali metals, are highly reactive and have a single valence electron. The elements in group 17, the halogens, are also highly reactive and have seven valence electrons.

The periods, or rows, on the periodic table are horizontal and are labeled with numbers from 1 to 7. These periods have elements that have a similar number of electron shells. For example, the first period has only two elements, hydrogen and helium, which have one electron shell. The second period has eight elements, lithium to neon, which have two electron shells.

The first element in the periodic table is hydrogen, which has the atomic number 1. It has only one proton in its nucleus and one electron in its outermost shell. The next element is helium, which has the atomic number 2. It has two protons in its nucleus and two electrons in its outermost shell. The rest of the elements are arranged in the table according to their atomic number, with the lightest elements at the top left of the table and the heaviest elements at the bottom right.

There are several notable elements in the periodic table, such as carbon, which is the basis of all living organisms; oxygen, which is essential for breathing; and iron, which is a crucial component of hemoglobin and is vital for the transport of oxygen in the blood. Other elements like sulfur, phosphorus, and chlorine are also important for life and have a wide range of uses in industry and medicine.

In summary, The periodic table is a useful tool for organizing and understanding the chemical elements, which are arranged in rows and columns according to their atomic number, electron configurations, and chemical properties. There are currently 118 known elements in the periodic table, each with its unique properties and uses.

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The set of reactants that will be the most efficient (use the least amount of resources) for the reaction is set D, which contains 2.0 mol C8H16 and 24.0 mol O2.

This is because the reaction's most effective ratio is 1 C8H16: 12 O2. This is the case because there is no excess of any reactant and the ratio of the reactants is equal to the ratio of the reactants in the reaction equation. This indicates that the reaction is the most efficient since it requires the least quantity of material to complete.

Reactants in chemical reactions must be mixed in a certain ratio for the reaction to proceed effectively and without using up extra reactants. The highest effective combustion ratio for C8H16 is 1:12, which calls for 12 moles of oxygen to burn one mole of C8H16.

As a result, set D, consisting of 2.0 mol C8H16 and 24.0 mol O2, is the most effective reaction for the provided reactants since it maintains the 1:12 ratio without using any extra reactants. This implies that no resources will be wasted because the reaction will use up every one of the reactants.

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Answer:

Explanation:

it's D i have it in my notes so the top of me is right :)

Confrontation, compromise, and withdrawal are all forms of conflict management. In conflict management, confrontation means facing up to or standing up to someone, while withdrawal means retreating from a relationship or situation when there is no possibility of conflict resolution.

Similarly, compromise is a way of resolving a conflict or disagreement by giving up something or meeting someone halfway. When a conflict arises, people use different strategies to manage it. Conflict management strategies can be classified into two broad categories; constructive conflict management and destructive conflict management. Constructive conflict management strategies are strategies used to resolve conflicts peacefully without any harm to either party. Such strategies include confrontation, compromise, problem-solving, negotiation, and collaboration. Conversely, destructive conflict management strategies are those that are aimed at causing harm, such as physical violence, emotional abuse, or verbal attacks.

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The major product of the second stereochemistry reaction is alkyl iodide, which is formed from alcohol.

When an alkene is hydrated, it produces alcohol. When Asymmetric Alkenes are treated with water in the presence of acid, the Markovnikoff rule is followed, and the Hydrogen of the incoming reagent goes to the carbon with the most Hydrogen atoms. The reverse (Anti-Markovnikoff) reaction is carried out by carrying out the Hydroboration reaction. In this case, the incoming reagent's Hydrogen atom is directed to the carbon with the fewest stereochemistry Hydrogen atoms. Both -H and -OH add in sync in this reaction. The hydroboration reaction of cholestrol is depicted below. The image below depicts the products of the reaction for the first reaction scheme, which follows the sn2 mechanism and thus results in the inversion of the configurations.

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In general, the formation of a chemical bond lowers the potential energy of a chemical system, leading to a more stable arrangement.

Stored energy depends upon the relative position of various parts of a system.

In bond formation, atoms lose their potential energy to attain stability and heat is evolved. The bond formation is an exothermic reaction.

Atoms bond together to form compounds to attain lower energies than they possess as individual atoms.

A quantity of energy is equal to the difference between the energies of the bonded atoms and the energies of the broken atoms.

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The cube is among the five Platonic solids. 0.56g/cm³ is the density if a 2.5cm cube of bone weighs 8.75g.

A cube is indeed a three-dimensional physical block having six square faces, facets, or sides, three of which meet at each vertex. It is a hexagon when viewed from a corner, and its net is commonly portrayed as a cross.

The cube is among the five Platonic solids and the only regular hexahedron. It has six faces, twelve edges, and eight vertices. In addition, the cube is a square parallelepiped, a equilateral cuboid, a right rhombohedron, and a 3-zonohedron.

density= mass/ volume

volume of cube =2.5×2.5×2.5=15.62cm³

density=  8.75/ 15.62=0.56g/cm³

Therefore, 0.56g/cm³  is the density if a 2.5cm cube of bone weighs 8.75g.

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Answer:

A.Magnesium

Explanation:

Answer:

magnesium

Explanation:

Answer:

neon

Explanation:

The mass of chromium that could be deposited by electrolysis of an aqueous solution of Cr2(SO4)3 for 155 min using a constant current of 10.0 A is approximately X grams.

During the electrolysis process, the amount of substance deposited on an electrode can be determined using Faraday's laws of electrolysis. The first law states that the mass of substance deposited is directly proportional to the quantity of electricity passed through the electrolyte. The quantity of electricity can be calculated using the equation Q = I × t, where Q is the quantity of electricity in coulombs, I is the current in amperes, and t is the time in seconds. Since the current is given as 10.0 A and the time is 155 min (or 9300 s), we can calculate Q as Q = 10.0 A × 9300 s.

The next step is to determine the number of moles of chromium ions (Cr³⁺) in Cr2(SO4)3. Cr2(SO4)3 contains 2 moles of chromium ions per formula unit. To find the number of moles of chromium ions, we divide the quantity of electricity (Q) by the Faraday constant (F), which is approximately 96,485 coulombs per mole of electrons. Thus, the number of moles of chromium ions is Q / F.

Finally, to calculate the mass of chromium, we multiply the number of moles of chromium ions by the molar mass of chromium, which is approximately 52.0 g/mol. Therefore, the mass of chromium deposited is equal to the number of moles of chromium ions multiplied by the molar mass of chromium.

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Answer:

based on this ball and stick model how many oxygen atoms are there in a milecule of 2 propanol

Explanation:

Lead cannot melt at such level, hence it cannot break down into individual atoms or molecules. A change in the bonding of atoms or molecules is referred to as melting.

The metallic connections are broken and the atoms are made more mobile by the energy needed to melt the metal. Atoms have the same kinetic energy as they did as a solid at a particular temperature, such as the melting point.

No, an atom cannot be melted. The three common states of matter no longer hold true when you are dealing with so tiny a piece. Atoms do not alter until by nuclear fission or fusion.

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Answer:

The reason is carbon's ability to form stable bonds with many elements, including itself. 

Explanation:

This property allows carbon to form a huge variety of very large and complex molecules. In fact, there are nearly 10 million carbon-based compounds in living things!

Answer:

Explanation:

The reason is that carbon is able to form stable bonds with many elements, including itself, which allows carbon to form a huge variety of very large and complex molecules.

Answer:

the neutral formula for magnesium chlorite is Mgcl2

\(\rm Mg(ClO_2)_2\) is the neutral formula for magnesium chlorite. The chlorite ion, also referred to as the \(\rm ClO_2^-\) ion.

The \(\rm ClO_2^-\) ion, also known as the chlorite ion, is what is commonly meant when the word "chlorite" is used. The positive and negative charges in a compound must be equal in order for it to be neutral. Since the magnesium ion (\(\rm Mg^{2+}\)) is a cation and has a +2 charge, it must shed two electrons in order to become stable. Because oxygen (O) generally has a -2 charge and in this instance there are two oxygens, the total charge is -2, the chlorite ion (\(\rm ClO_2^-\)) has a -1 charge. It has a -1 charge since the molecule only contains one chlorite ion.

Balance the charges in order to make the compound electrically neutral. We require two chlorite ions to balance the charge because the chlorite ion has a -1 charge and the magnesium ion has a +2 charge. As a result, \(\rm Mg(ClO_2)_2\) is the proper formula for magnesium chlorite.

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Answer:

Amorphous solid is a form of solid

Explanation:

Amorphous solid is a solid in which atoms are not arranged in a definite geomatric pattern for eg. glass,paper etc

Answer:

1s22s22p32d6

Explanation:

is a reasonable electron configuration

Answer:

Chlorine is more likely to steal a valence electron from sodium.

Explanation:

Sodium is number 11 on the periodic table with one valence electron. Belonging to the first group, it's one of the alkali metal, which are known to be highly reactive. Chlorine is number 17 with seven valence electrons, and it's in the second-to-last group of halogens--also very reactive.

Considering that elements with one valence electron are just about 100% likely to give up electrons to reach a stable state, sodium would be the element that is more likely to lose its valence electron to chlorine. In other words, chlorine would be the electron thief.

The volume of the copper is equal to  4cm³.

The density of the substance can be described as the substance's mass per unit of its volume. The symbol commonly used to express density is ρ and the D letter can also be used.

The mathematical formula of the density can be expressed as written below:

Density = Mass/Volume or ρ = m/V

The density of a material varies with temperature and pressure. There is a small variation for solids as well as liquids but much larger for gases. Increasing the pressure of material decreases the volume of material and thus increases its density.

Given the mass of the copper = 35.2 g

The density of the copper at  20°C, d = 8.80 g/cm³

The volume of the copper, V = mass/density = 35.2/8.80 = 4 cm³

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The pressure acting here is 3.32 atm. Then the volume of copper can be determined using ideal gas law. The volume is 3.9 L.

Ideal gas equation is a combination of   Boyle's law, Charle's law and Avogadro's law. The expression relating pressure, volume,   temperature and number of moles of a gas is written as:

PV = nRT.

It can be rearranged as PM = dRT.

where d is the density and M be the mass.

Atomic mass of copper = 63.5 g/mol

density = 8.80 g/cm³

T = 20° C or 293 K.

Then pressure p =  dRT/M

p = 8.80 g/cm³ × 0.082× 293 /63.5 = 3.32 atm

Now the weight of copper = 35.2 g

number of moles of Cu = 35.2/63.5 = 0.5 g.

Then, v = nRT/P

v = 0.5 × 0.082 × 293 /3.32 = 3.9 cm³.

Therefore, the volume of copper is 3.9 L.

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The expression equivalent to -3(4x + 3y) is -12x - 9y

The expression we have is = -3(4x+3y)

We will apply the distributive property to find the correct expression,

The distributive property-

It states that when the sum of two or more variable are multiplied by a number gives the exact similar result as when each variable is multiplied separately by the number, and the products of both are added together.

The distributive property of the addition is given as -

A(B + C) = AB + AC

The distributive property of the subtraction is given as -

A(B - C)  = AB - AC

We know the expression is -3(4x + 3y)

We will apply the distributive property in the given expression

-3(4x + 3y) = -12x - 9y

Hence, the expression equivalent to -3(4x+3y) is -12x-9y

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