25. What is the most stable form of elements when it comes to electrons and Orbitals? (Hint: Think about the noble gases.)

Answer:

1.) 2 Fe (s) + O2 (g) --> 2FeO (s)

2.) 4 Fe (s) + 3O2 (g) --> 2 Fe2O3

Answer:

\(E=1.48x10^4J\)

Explanation:

Hello!

In this case, since the energy implied in a heating process is computed by using the following equation:

\(E=mC(T_f-T_i)\)

Whereas m is the mass, C the specific heat and T the temperature. In such a way, by plugging in the given mass, specific heat and temperatures, we obtain the following energy:

\(E=187.0g*4.703\frac{J}{g\°C} (52.9\°C-36.1\°C)\\\\E=1.48x10^4J\)

Considering that the specific heat can by used by unit of °C or K because their difference is equivalent.

Regards!

Explanation:

PH3 has a lone pair(a pair of electrons that are not shared with other atoms) and has a trigonal pyramid. Therefore, PH3 is considered as a polar molecule.

According to Newton's Third Law of Motion, The force the child applies on the boat same force that is applied to the child.

The third regulation states that for every movement (force) in nature there is the same and contrary reaction. If item A exerts a force on object B, object B also exerts an identical and contrary force on item A. In different phrases, forces result from interactions.

The swimmer whilst swimming pushes in opposition to the pool wall along with his feet and in return hurries up (swims) inside the course contrary to that of his push. Newton's third law of motion states that for each movement, there may be the same and contrary reaction.

The third law states that for each motion (pressure) in nature there is a same and contrary reaction. If object A exerts pressure on item B, object B also exerts an identical and contrary pressure on object A.

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Answer:

3

Explanation:

Answer:

They dissociate into positive and negative ions in the solution.

Explanation:

NaCl when dissolved in water dissociates into Na+ ion and Cl- ion.

Answer:

Kc = [B₃]²/[A₂]³  = 0.40

Explanation:

3A₂ ⇄ 2B₃  

Given at equilibrium =>  [A₂] =2.5 and [B₃] = 2.5

Kc = [B₃]²/[A₂]³ = (2.5)²/(2.5)³ = (2.5)⁻¹ = 0.40

There are numerous ways to determine whether lead is present in an ore. Atomic absorption spectroscopy is a popular approach. With this method, an ore sample is dissolved in acid and then atomized in a flame or plasma.

The sample's atoms will absorb light at particular wavelengths that are peculiar to the element under investigation. The amount of light absorbed can be used to calculate how much lead is present in the sample. Inductively coupled plasma mass spectrometry and X-ray fluorescence spectroscopy are further techniques. It is crucial to remember that these procedures call for specialized tools and training, thus they ought to only be carried out in a lab by qualified experts.

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If we sum the molar masses of the elements, we find that the molar mass of the compound C₅₅H₇₂N₄O₅ is 869.31 g/mol.

The molar mass is the mass in grams of 1 mole of a substance.

To calculate the molar mass of a compound, we need to sum the molar masses of the elements that form it, which can be found in the periodic table.

M(C₅₅H₇₂N₄O₅) = 55 M(C) + 72 M(H) + 4 M(N) + 5 (O)

M(C₅₅H₇₂N₄O₅) = 55 (12.01 g/mol) + 72 (1.01 g/mol) + 4 (14.01 g/mol) + 5 (16.00 g/mol) = 869.31 g/mol

There is a mistake in the question. The original question is:

C₅₅H₇₂N₄O₅, what is the molar mass?

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Step by step solutions:

1 mole of A contains 6.022x10^23 molecules

∴ x moles A contains 5.99x10^23 molecules

Then, moles of A = (5.99x10^23 /6.022x10^23 )molecules

=5.99/6.02

=0.995moles of A Sample

Given that -

Mass = 93.5g

Mol Mass Ammonium carbonate (NH4)2CO3= 96,09 g/mol

∴ moles B = mass /molecular mass

=93.5g /96.09g/mol

=0.973 moles of sample B

Conclusion: Sample A has 0.995 moles, this is bigger that the moles of Sample B that has 0.973 moles.

The plasma membrane is primarily made up of phospholipid bilayers. Other molecules, such as the steroid cholesterol, are also present.

The plasma membrane, also referred to as the cell membrane, is the membrane found in all cells that separates the cell's interior from its surroundings.

A cell wall is basically attached to the plasma membrane on the outside of bacterial and plant cells.

Membrane biogenesis is the process by which plasma membranes form. Proteins and lipids are created first in the rough endoplasmic reticulum and then in the smooth endoplasmic reticulum.

These are then taken to the Golgi complex to be modified.

The plasma membrane is primarily made up of phospholipid bilayers.

Other compounds discovered in the membrane have included the steroid cholesterol, that also works to help the membrane maintain its shape, and transport proteins, which allow substances to pass through the membrane.

Thus, these are some other materials present in cell membrane.

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Answer:

Hope this helps u!!

Explanation:

A useful application of half-lives is radioactive dating. This has to do with figuring out the age of ancient things. If you could watch a single atom of a radioactive isotope, U-238, for example, you wouldn't be able to predict when that particular atom might decay. :) :)

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Answer:

single, antom-radioactive isotope U-238.

Explanation:

Answer:

The answer is C!

Explanation:

Hope it helps

Answer D

Explanation: did the quiz ψ(｀∇´)ψ

Considering the definition of empirical and molecular formula, if the molecular formula mass of the compound is 60.0 g/mol, the molecular formula is N₂O₂.

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms.

The molecular formula is the chemical formula that indicates the number and type of distinct atoms present in the molecule. The molecular formula is the actual number of elements that make up a molecule.

The empirical formula and the molecular formula are generally related in the following way:

Molecular Formula = n× Empirical Formula

where n is n=molecular mass÷ empirical mass

In this case, in first place you need to convert the number of grams given into percentage as follow:

Assuming a 100 grams sample, the percentages match the grams in the sample. So you have:

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

Therefore the N: O mole ratio is 1: 1

Finally, the empirical formula is N₁O₁= NO

The molecular mass is 60.0 g/mol and the empirical mass is 30 g/mole. Then, the value of n is:

n=60 g/mole÷ 30 g/mole

Solving:

n=2

Being the Molecular Formula = n× Empirical Formula, the you can calculate:

Molecular Formula = 2× (NO)

Molecular formula= N₂O₂

Finally, the molecular formula is N₂O₂.

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Answer:

Transfer

Explanation:

Sharing happens at covalent bond

Transfer happens at ionic bond

This why we say to ion because they give electron get positive or take electron and negative

Answer:

??????

Explanation:

In this equation, two molecules of aluminum hydroxide react with three molecules of sulfuric acid to produce one molecule of aluminum sulfate and six molecules of water.

What is Molecules?

A molecule is a group of two or more atoms that are chemically bonded together. Atoms can combine to form molecules by sharing electrons between them, forming a covalent bond. Molecules can also be formed by the attraction between oppositely charged ions, known as ionic bonding.

Molecules can be made up of atoms of the same element or atoms of different elements. For example, oxygen gas (O2) is a molecule made up of two oxygen atoms, while water (H2O) is a molecule made up of two hydrogen atoms and one oxygen atom.

The balanced chemical equation for the reaction between aluminum hydroxide and sulfuric acid is:

2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O

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Answer:

C.Potential Energy

Explanation:

Answer: 14.0

Explanation: 14.0 is a base. The more basic, the less hydrogen ion concentration.

Answer: A

Explanation:

The -ane suffix implies that the compound has only single bonds for carbon-carbon bonds. The but- prefix implies that the compound consists of four carbons. Since 4 bonds are required for each carbon, there will be a total of 10 hydrogen atoms: 3 on each carbon at the end of the chain and 2 for each carbon in the middle of the chain. Thus, butane is A.

Answer:

22.24°C.

Explanation:

The change in temperature of the iron can be calculated using the formula: ΔT = Q / (m * c), where ΔT is the change in temperature, Q is the heat added, m is the mass of the substance and c is the specific heat capacity.

Substituting the given values into the formula: ΔT = 115 cal / (47.0 g * 0.11 cal/g⋅°C) ≈ 22.24°C

So, the change in temperature of the iron is 22.24°C.

The molarity of the NiSO₄ solution made by dissolving 38.81 grams of nickel (ii) sulfate, NiSO₄, in enough water to make 0.467 liters of solution is 0.535 M

First, we shall obtain the mole of 38.81 grams of nickel (ii) sulfate, NiSO₄. Details below:

Mole of NiSO₄ = mass / molar mass

= 38.81 / 154.75

= 0.25 mole

Now, we shall determine the molarity of the solution. Details below:

Molarity of solution = mole / volume

= 0.25 / 0.467

= 0.535 M

Thus, the molarity of the solution is 0.535 M

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Answer:

none of the above

Explanation:

deposition (gas to solid), sublimation (solid to gas), evaporation, this all is physical change not chemical change

Answer:

Green.

Explanation:

Only the particles that hit the nucleus of the atom bounced off.

The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.

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Answer:

Nonmetallic elements form ions by gaining valence electrons to complete their outer shell.

The more valence electrons an element has in its outer shell, the easier it is to complete.

The fewer electron shells an element has, the easier it is to fill its outermost shell.

Reactivity in nonmetals increases as you go from left to right in a group, and

decreases as you go from top to bottom.

Explanation:

Nonmetallic elements form ions by gaining valence electrons to complete

their outer shell.

The more valence electrons an element has in its outer shell, the easier it is to complete.

The fewer electron shells an element has, the easier it is to fill its outermost shell.

Reactivity in nonmetals increases as you go from left to right in a group, and decreases as you go from top to bottom.

When there are more valence electrons then it makes it easy for the element

to complete its outermost shell as against if it was less as it would be harder

due to a bigger number of electrons needed.

Non metals are elements which accepts valence electrons to complete its

outermost shell and becomes negatively charged when this happens.

When an element has fewer electron shells then filling the outermost shell

will be easier as the electron shells require a lesser number of electrons and

increases as the number of shells increases.

This is because the tendency to accept electrons increases from left to right

and decreases down the group.

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