phosphorus has an atomic mass of 31 and an atomic number of 15 ,so the number of nuetrons must be ?

Answer:

307.94g of CO₂

Explanation:

Equation of reaction

2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

molarmass of C₈H₁₈ = 114.33g/mol

2 moles of C₈H₁₈ = 228.66g/mol

Molar mass of CO₂ = 44.0095g/mol

16 moles of CO₂ = 704.152g/mol

From equation of reaction,

2 moles of C₈H₁₈ reacts with 16 moles of CO₂;

228.66g of C₈H₁₈ = 704.152g of CO₂

100g of C₈H₁₈ = y moles of CO₂

y = (100 * 704.152) / 228.66

y = 307.94g of CO₂

Therefore, 100g of C₈H₁₈would yield 307.94g of CO₂.

Metallic solids are comprised of metal atoms arranged in a repeating pattern within the crystalline structure's unit cells, which lack covalent bonds and molecules.

The structural units that make up metallic solids are metal atoms. These atoms are arranged in a regular pattern within a crystalline solid, creating a structure described by its unit cell. Unit cells are the simplest repeating units in a crystal lattice and consist of lattice points that represent the locations of metal atoms or ions. These cells repeat in three dimensions. Unlike nonmetal structures that contain covalent bonds and consist of individual molecules, metallic solids are characterized by a closely packed array of metal atoms that do not contain molecules or covalent bonds. Properties such as malleability and ductility stem from this regular atomic arrangement. Additionally, the 'sea' of delocalized electrons surrounding the nuclei of metal atoms is responsible for the properties like high thermal and electrical conductivity, metallic luster, and varied bulk properties.

Final answer:

To solve 4cos²(theta) - 3 = 0 within [0, 2pi], isolate the cosine function and find the angles where cos(theta) = ± √3/2. The solutions are theta = 1/6 pi, 5/6 pi, 7/6 pi, and 11/6 pi.

Explanation:

To solve the equation 4cos²((theta) - 3 = 0 for theta in the interval [0, 2pi], we need to follow these steps:

The solution to the equation are the angles theta = 1/6 pi, 5/6 pi, 7/6 pi, and 11/6 pi.

A volumetric pipette

Answer : The correct option is, a volumetric pipette

Explanation :

Volumetric pipettes : It is a type of instrument that are used in volumetric analysis. It is used for the exact smaller volume of a sample solution  or a reagent.

In the volumetric pipette, the upper part of the pipette has a ring like mark that marks its calibrated volume.

Burette : It is used in the titration for the known concentration of the solution.

Beaker : It is not used in the titration because it is not accurate for the measurement.

Erlenmeyer flask : It is a conical flask which is also used in the titration.

Hence, a volumetric pipette instrument is most often used to measure acid volume before a titration begins.

Atomic Number, Ionic Radius, and First Ionization Energy are properties that depend on an element's structure, in particular its electron configuration. Atomic Number corresponds to an element's proton count, defining its identity and placement in the periodic table. Ionic Radius pertains to the size of an ion that forms when it loses or gains electrons. First Ionization Energy is the energy required to remove an electron from a neutral atom. These relationships reflect broader periodic trends.

The Atomic Number of an element is the count of protons in its nucleus. It determines the identity of an element and its placement on the periodic table. As the atomic number increases, the atomic size usually also increases because more energy levels are needed to accommodate more electrons.

The Ionic Radius refers to the size of an ion, which changes depending on whether it gains or loses electrons (and thus becomes an ion). Typically, cations (which lose electrons) are smaller than their parent atoms, while anions (which gain electrons) are larger because in both cases, the electron configuration changes, altering the electron-electron repulsion and consequently, the size of the ion.

The First Ionization Energy is the energy necessary to remove the first electron from a neutral atom. As atomic number increases, first ionization energy tends to increase because the outermost electrons are closer to the nucleus, thus more strongly attracted to the nucleus, making them harder to take away.

The relationships between Atomic Number, Ionic Radius, and First Ionization Energy are all part of the broader set of periodic trends, describing element's behavior across and down the periodic table.

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Lewis dot structures, also known as electron dot structures, are schematics that show the interatomic chemical bonds in a molecule. Additionally, they show how many lone pairs there are overall in each of the atoms that make up the molecule.

The electrical structures of the elements, especially the electron pairings, are reflected in the Lewis dot structures. Lewis structures can be viewed as "electron bookkeeping" and are a helpful approach to condensing some bonding-related information. Each dot in a Lewis dot structure corresponds to 1 electron.

The electrons that do not belong to the outermost shell are omitted while designing Lewis dot structures and only the valence electrons are taken into account.

Here the Lewis structure of AlH₄⁻ is:

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The stage labelled C in the diagram is the G2 PHASE.

The cell cycle is divided into G1, S, G2 and M phases. The G2 phase is part of the phases of eukaryotic cell cycle. It is the second stage of interphase, it always occur after the completion of S phase. G2 is the stage, where the cell undergo more growth, produce more proteins and check the replicated DNA in order to verify that the cell is ready to enter into the mitosis phase.

Answer:

e2020 kids, D. G2 phase

Explanation:

fourteeeeeeeeeeeeeen

Answer: Total number of electrons that can be occupied in 5f-sub-level are 14.

Explanation: f-sub-level has in total 7 orbitals.

Each orbital can hold 2 electrons, both in opposite directions.

As, f-sub-level has in total of 7 orbitals, so the total number of electrons that can be held in 5f-sub-level is ( 7 × 2) = 14 electrons.

Final answer:

The SI unit for current is the ampere (amps), which measures the flow of electric charge as one Coulomb per second.

Explanation:

The SI unit for current is the ampere, often shortened to amps. An ampere is defined as one Coulomb per second (1 A = 1 C/s), which represents the flow of electric charge. It is a fundamental unit in the SI system, and is crucial in the study of electricity and magnetism. Other units such as volts, joules, and ohms, are related to different aspects of electrical measurements. Volts measure electric potential difference, joules are a unit for energy, and ohms are the unit of electrical resistance.

B)Reacts with acid !

4) The answer is: Chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not.

Differences between nuclear and chemical reactions:

1) The electrons of an atom participates in a chemical reaction and protons in nuclear reaction.

2) Chemical reactions involve the rearrangement of electrons, because there is transfer, loss, gain and sharing of electrons in chemical reactions.

3) Nuclear reactions can produce new elements, because number of protons and neutrons is changed, chemical reactions donot produce new element.

4) Chemical reactions require heat or an input of energy to occur, this is activation energy.

5) Isotopes of the same element behave differently in a nuclear reaction, because isotopes have different number of neutrons, so products of a nuclear reaction is different.

6) The answer is: nuclear change.

Transmutation is a process that involves a change in the nucleus of an atom. It can be natural or artificial.  

For example: 14/7 N + 4/2 He --> 17/8 O + 1/1 H.  

This example is the first artificial nuclear transmutation described by Rutherford in 1919.  

Artificial transmutation can be expressed by nuclear reaction:  

Target Nuclide + Bombardment Particle → New Nuclide + Ejected Particle.  

Answer:

potassium (k), because they are both alkali metals

Explanation:

Full test answer 100%

1. C. government

2. D.

3.B. The child savers movement

4. A. Status offenses

5.A.

6.A. To determine if there is a probable cause to proceed with trial

7. D. language barriers

8.D. Neglected

9. D. referral, intake, adjudication, dispositional hearing, aftercare

10. B. The juvenile court system holds public hearings, while in the adult court system hearings are private.

Answer : The correct option is, only alpha particles.

Explanation :

Penetration power : It is defined as the movement of the rays or the particles through the object.  As more the energy of a particle, the more will be the penetrating power.

The ascending or increasing order of the penetration power of the particles will be :

Alpha rays < Beta rays < Gamma rays

The penetrating power of the particles alpha, beta and gamma rays varies differently.

Hence, the particles can be stopped by human skin is only alpha particles.

One mole each of CH4, NH3, H2S, and CO2 are added:

For CH4:

moles of C = 1

moles of H = 4 x 1 = 4

1 litre of water is = 55.5 moles of water.

so, in water:

moles of oxygen = 55.5

moles of hydrogen = 2 x 55.5 = 111

For NH3:

moles of N = 1

moles of H = 3 x 1 = 3

For H2S:

moles of H = 2 x 1 = 2

moles of S = 1

For CO2:

moles of C = 1

moles of  = 2 x 1 = 2

Now, add the total moles of each atom:

Hydrogen = 111 + 4 + 3 +1 = 119 moles

Oxygen = 55.5 + 2 = 57.5

Carbon = 1+1 = 2

Sulfur = 1

nitrogen = 1

What is mixture and compound?

In chemistry mixture is a combination of two or more different chemical elements which are not chemically bond. A mixture is the physical combination of two or more elements in which their individual identities are retained and it also mixed by solutions, suspension and colloids.

In chemistry compound is combination of two or more different elements which are chemically bond. So compound is held by chemical bond. A compound can't be separate by physical separation and after the mixture you can't identified that it is compound or not.

Therefore,Hydrogen = 111 + 4 + 3 +1 = 119 moles

Oxygen = 55.5 + 2 = 57.5

Carbon = 1+1 = 2

Sulfur = 1

Nitrogen = 1

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Chemical change is caused by burning among the given choices. The correct answer is C.

Chemical change: It is a process in which the chemical property of a substance is changed. Or we can say, chemical changes produce new substances and is an irreversible process. For example, turning of milk into curd.

Burning refers to a chemical reaction known as combustion, where a substance reacts with oxygen to produce new substances, typically accompanied by the release of heat and light. During combustion, the chemical bonds within the original substance are broken, and new bonds are formed with oxygen. This process results in the transformation of the original substance into different chemical compounds, indicating a chemical change.

Whereas moving, shattering, and melting, are physical processes that do not involve a change in the chemical composition of the substance.

Therefore, the correct option from the given list that causes a chemical change is, C. Burning.

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The size of an astatine atom is predicted to be larger than that of tellurium.

Astatine and tellurium belong to the same group on the periodic table, but astatine has one more electron shell than tellurium, resulting in a larger atomic size. Astatine, with an atomic number of 85, has its electrons arranged in 6 electron shells, while tellurium, with an atomic number of 52, has electrons distributed across 5 electron shells. The increase in the number of electron shells for astatine leads to greater atomic size due to increased electron-electron repulsion, outweighing the increased nuclear charge.

Astatine's atomic radius is estimated to be greater than tellurium's due to the additional electron shell, leading to a larger atomic size. The trend across a period indicates a decrease in atomic radius from left to right due to increased nuclear charge and effective nuclear charge. However, within a group, atomic size generally increases going down the group due to the addition of electron shells. Hence, astatine, being located below tellurium in the same group (Group 16), is expected to have a larger atomic radius.

This prediction aligns with the periodic trend and the understanding of atomic structure, wherein the increase in electron shells as you move down a group results in larger atomic size, indicating that astatine would likely possess a larger atomic radius compared to tellurium.

Answer : The reaction is endothermic in nature.

Explanation : A system of reactants which absorbs heat from the surroundings in an endothermic reaction has a positive ΔH reaction value, as the enthalpy of the products is higher than the enthalpy of the reactants of the system.

As the enthalpies of these reactions are greater than zero, they are called as endothermic reactions. Which absorbs the heat during the chemical reactions.

If the Hrxn of a reaction is positive then the reaction is endothermic reaction. In an endothermic reaction, heat is absorbed by the chemical reaction from the surrounding.

Reactants + heat --> Products

In the activation energy diagram the heat of the products is greater than the heat of the reactants in an endothermic reaction.

A. Nucleotide is the correct answer

Two examples of precipitation reactions that form white precipitates are the combination of calcium chloride with silver nitrate to form silver chloride, and the reaction of lead (II) nitrate with potassium iodide to form lead iodide (though not white).

In the context of precipitation reactions, two examples that result in a white precipitate are:

Lead (II) nitrate solution reacts with a potassium iodide solution forming a yellow precipitate of lead iodide (although the precipitate is not white, it helps illustrate the concept of precipitation reactions).

When a solution of calcium chloride is mixed with a silver nitrate solution, a white precipitate of silver chloride is formed. The potential reaction would be:

CaCl2(aq) + 2AgNO3(aq) → 2AgCl(s) + Ca(NO3)2(aq)

These reactions involve combining two soluble ionic compounds that yield an insoluble compound, forming a precipitate that is visible at the bottom of the reaction vessel. A commonality among precipitation reactions is that they involve solubility rules to predict which combination of ions will produce an insoluble salt in the double-displacement reactions.