Determine the radius of a magnesium atom, using only the information on the attached photo. !!PLEASE HELP!!

The number of significant figures in each of the following measured quantities: (a) 3.774 km = 4  (b) 205 m² = 3 (c) 1.700 cm = 4 (d) 350.00 K = 5 (e) 307.080 g = 6 (f) 1.3 × 10³ m/s = 2.

These are minimum number from zero to nine which are  required for reporting any measurement in significant figures digit is uncertain.

The starting zero are not significant figures, decimal is not a significant figures, ending zero after decimals are significant figures and ending zero before without decimal is not significant figures.

Therefore, number of significant figures in each of the following measured quantities: (a) 3.774 km = 4  (b) 205 m² = 3 (c) 1.700 cm = 4 (d) 350.00 K = 5 (e) 307.080 g = 6 (f) 1.3 × 10³ m/s = 2.

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There is an inversion of stereochemistry, which implies a back-side attack of the nucleophile as in SN₂ reaction the nucleophile attacks opposite from the side of the leaving group.

SN2 (Substitution Nucleophilic Bimolecular) reactions occur when a nucleophile attacks an electrophilic carbon atom and substitutes a leaving group. In SN₂ reactions, the nucleophile attacks from the opposite side of the leaving group, which causes the stereochemistry at the reaction center to invert.
The size of the anion can affect the nucleophilicity due to solvation, with larger anions being less suppressed by solvation.

Additionally, smaller anions may be more solvated by ion-dipole forces.

However, these factors do not directly influence the stereochemical outcome of the SN₂ reaction.

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Answer:

2Li + ZnBr2 ->2LiBr + Zn

3Ca + Al2O3 ->2Al + 3CaO

Explanation:

Spontaneous reactions are reactions that can happen on their own. For a spontaneous reaction to occur, a metal that is higher in the activity series must displace a metal that is lower in the activity series from its solution and not vice versa.

If we look at the two reactions selected in the answer, lithium is above zinc in the activity series and calcium is above aluminum in the activity series hence the two reactions occur spontaneously.

The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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Answer:

2.Diffusion

Explanation:

As we metabolize certain nutrients for the correct functioning of our cells, carbon dioxide is produced as a result. We need oxygen in order to metabolize them, so we need to have a system to incorporate it, and to eliminate the carbon dioxide produced.

This system is provided by the interaction between the respiratory system, which allows the enter of oxygen into the body and gets rid of the carbon dioxide, and the circulatory system, which acts transporting carbon dioxide and oxygen to and from the lungs, respectively.

The surface available for the gaseous exchange is enlarged by the pulmonary alveoli. The alveoli are the terminal aerial spaces of the respiratory system and the structures where the exchange between the air and blood is produced. Each alveolus is surrounded by a net of capillaries, where oxygen is freed from the hemoglobin and moves into the cells by diffusion. Carbon dioxide, diffuses out of the cells into the capillaries, where most of it dissolves in the plasma of the blood.

Answer: H2O2

Explanation: The formula that represents hydrogen peroxide is H2O2

Answer:

Chemical Nomenclature?

Explanation:

Considering the definition of complete combustion, the chemical equation for the complete combustion of C₇H₁₆ is:

C₇H₁₆(l) + 11 O₂(g) → 7 CO₂(g) + 8 H₂O(g)

Combustion is a chemical process through which heat is obtained. To achieve this, oxidation reactions are generated that allow the objective to be reached. It is necessary to have several elements:

Complete combustions are those reactions in which the combustible material is completely oxidized (consumed) and other oxygenated compounds are produced, such as carbon dioxide (CO₂) or sulfur dioxide (SO₂), as the case may be, and water (H₂O).

In other words, complete combustion is the result of the complete oxidation of the fuel but not the disappearance of the oxidizer, that is, the oxidation of all the fuel occurs. For this it is necessary that the necessary quantities of oxidizer and dry air intervene. All complete combustion releases, as a product of the reaction, carbon dioxide (CO₂) and water in the vapor state (H₂O).

Considering the definition of complete combustion, you get:

C₇H₁₆(l) + 11 O₂(g) → 7 CO₂(g) + 8 H₂O(g)

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Pressure has little effect on the solubility of liquids and solids because they are almost incompressible. This statement is True. Solid solubility hardly gets affected by changes in pressure.

A substance's physical and chemical characteristics affect how soluble it is. A few other factors and circumstances can also influence it. A few of them are: temperature, pressure, type of binding, and forces between the particles.

Pressure has a significantly greater impact on gases than it does on solids and liquids. The likelihood of a gas's solubility also increases as its partial pressure rises. One instance of how CO2 is stored under high pressure is in a soda bottle.

In like, like dissolves.

Each molecule has a unique set of intermolecular forces and connections. The likelihood of solubility between two dissimilar compounds is less likely than that between like substances. For instance, ethanol is highly soluble in water, a polar solvent, whereas water is not.

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The following equation serves as the first order reaction speed law:

k = -1 * (d[A] / dt) * (1 / [A]

Where k is the speed constant, [A] is the reactivo concentration, and (d[A] / dt) is the rate of change of the concentration with respect to time.

We may rearrange this equation to obtain an expression that allows us to calculate the time it takes for a reactivo to go from an initial concentration of [A]0 to an end concentration of [A]:

t = (1/k)*ln([A]0/[A])

Where the natural function of logic is.

By substituting the values given in the question, we have:

k = 2.5 × 10^-3 s^-1 \s[A]

₀ = 0.15 M \s[A] = 0.0375 M

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Answer:

P1*V1/T1=P2*V2/T2

I think this will help you

The binding energy per nucleon for silver-109 is 1.285 × 10⁻¹¹ kJ/mol.

In order to calculate the binding energy per nucleon, which is expressed in units of energy per mole of nuclei (kJ/mol), we need to use the following equation:

BE/A = (Δmc²)/A

where BE/A is the binding energy per nucleon, Δm is the mass defect (the difference between the actual mass of the nucleus and the sum of the masses of its constituent nucleons), c is the speed of light, and A is the mass number (the total number of protons and neutrons) of the nucleus.

The atomic mass of silver-109 is 108.90585 g/mol, so its mass number is 109. We also have the required masses of its constituent nucleons, which are 47 for protons and 62 for neutrons.

Using the atomic masses of silver-109 and its constituent nucleons, we can calculate the mass defect as follows:

Δm = (108.90585 g/mol - (47 × 1.007825 g/mol + 62 × 1.008665 g/mol)) = 0.008601 g/mol

where 47 and 62 are the numbers of protons and neutrons in the nucleus, respectively.

Converting the mass defect to energy using Einstein's famous equation E = mc² we get:

ΔE = Δmc² = (0.008601 g/mol) × (299792458 m/s)² = 7.732 × 10⁻⁴ J/mol

Finally, we convert the energy per nucleus to energy per mole of nuclei and then to kilojoules per mole by dividing by the Avogadro constant and multiplying by 10⁻³:

BE/A = ΔE/A × N_A × 10⁻³ = (7.732 × 10⁻⁴ J/mol)/(6.022 × 10²³ mol⁻¹) × 10⁻³ = 1.285 × 10⁻¹¹kJ/mol

Therefore, the binding energy per nucleon for silver-109 is 1.285 × 10⁻¹¹kJ/mol.

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One of the main objections to the heliocentric model, which places the Sun at the center of the solar system with the planets orbiting around it, was the lack of observable stellar parallax.

Parallax is the apparent shift in the position of an object when viewed from different locations. The lack of observable parallax of the stars was seen as evidence against the heliocentric model, as it was believed that if the Earth were orbiting the Sun, there should be an observable shift in the positions of the stars as the Earth moved in its orbit.

However, this objection was later resolved when it was realized that the stars are much farther away than originally thought, making their parallax much smaller and therefore more difficult to observe. With more accurate measurements and the development of better telescopes, the parallax of nearby stars was eventually observed, confirming the heliocentric model and providing evidence for the Earth's orbit around the Sun.

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Examples of erosion or corrosion caused by water include: An coastal beach's rocks are battered by the waves. Small rocks are carried down a hillside by a river. A tunnel is created when underground water dissolves limestone.

Rust, which results from oxidation, and acid rain, which is brought on when carbonic acid dissolves rocks, are two instances of chemical weathering. additional molecular weathering.

On a mountainside, tiny rock fragments break off due to wind and precipitation. Chemical and mechanical mechanisms can cause weathering. The migration of particles away from their source is erosion. A tiny rock fragment is carried away from a mountainside by the wind as an illustration of erosion.

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Answer:

D

Explanation: Trust me

The triple beam balance measures the mass of an object in grams.

Explanation:

           Middle beam = Increments of 100 grams

           Front beam = Increments from 0 grams  to 10 grams

           Farther beam = Increments of 10 grams

So, from this, we can conclude that the triple beam balance measures the mass of an object in grams. Hence the correct answer is option A.

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Answer:

Freezing of water

Explanation:

When water becomes a solid it releases heat into its surroundings (warming it up).

The correct order of the increasing polarity of the analyte functional group isEthers < Esters.

The given statement is "Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters."  The order of polarities of functional groups is the order of their increasing polarity (i.e., less polar to more polar) based on their electron-donating or withdrawing ability from the rest of the molecule.Polarity of analyte: The analyte's polarity is directly proportional to the dipole moment of the functional group, which is associated with a difference in electronegativity between the atoms that make up the functional group.The electronegativity of an element is its ability to attract electrons towards itself. The greater the difference in electronegativity between two atoms, the more polar their bond, and hence the greater the polarity of the molecule.

To find the correct order of the increasing polarity of the analyte functional group, let's first compare the two groups: hydrocarbon ethers and esters. Here, esters have a carbonyl group while ethers have an oxygen atom with two alkyl or aryl groups. The carbonyl group has more electronegative oxygen, which pulls electrons away from the carbon atom, resulting in a polar molecule. On the other hand, ethers have a less polar oxygen atom with two alkyl or aryl groups, making them less polar than esters. Therefore, the correct order of the increasing polarity of the analyte functional group isEthers < Esters.

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To determine the pH of a solution containing 1.0 mole of ammonium nitrate (NH4NO2) dissolved in 1.0 liter of water:

Ammonium nitrate (NH4NO2) is a salt that dissociates in water to produce ammonium ions (NH4+) and nitrate ions (NO2-). The presence of these ions affects the pH of the solution. The ammonium ion (NH4+) is a weak acid that can undergo partial dissociation, releasing a proton (H+). This proton contributes to the acidity of the solution, resulting in a decrease in pH. To calculate the pH, we need to consider the dissociation of the ammonium ion. Since we are given a 1.0 molar solution of NH4NO2, we can assume that all the ammonium nitrate dissociates completely. However, to determine the exact pH, we also need to know the acid dissociation constant (Ka) of ammonium ions. With this information, we can calculate the concentration of H+ ions and convert it to pH using the formula pH = -log[H+].

Without the specific value for Ka, it is not possible to calculate the pH accurately. The pH of the solution would depend on the Ka value and the concentrations of the dissociated ions.

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The correct answer is cerium 141,911amu.

A unit atomic mass is defined as one-twelfth of the mass of a single carbon-12 atom. The atomic mass of an element is the atomic mass. Average atomic mass is the weighted average of the atomic masses of all isotopes of that element.

To answer this question, a formula is written to calculate the average atomic mass of cerium. (135.90714 amu × 0.0019 )+ ( 137.90599 amu × 0.0025 )+ ( 139.90543 amu * 0.8843 )+(Ce−142 × 0.1113)

= 140.116

Solving the equation for Ce-142 gives an atomic weight of 141.911 amu.

The correct answer is 141,911 amu. 

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Answer: The answer is D,

Answer:

Explanation:

21. Atoms are not created or destroyed means that atoms that you begin with are the atoms that you will end with. The catch is that the atoms will rearrange to give you new compounds, but the atoms that you initially had are the atoms you will still have after reaction. For eg, if you started with eggs and made omelet. Omelet is a "new" compound, but the atoms that were in the eggs have rearranged to become the omelet so can you see that atoms were not created or destroyed to make the omelet.

22. Yes because amount of products you make depends on how much reactants you have. For eg, I need two graham cracker(GC), one marshmallow(M), and one chocolate (C) to make a s'more. If I get more of each item then I can make more s'mores and consequently having minimum amounts results in less s'mores that I make.

23. Not possible, due to law of conservation of matter and energy. Atoms cannot be created nor be destroyed, they are simply rearranged. For eg, Taking A + B cannot give you a new compound with a chemical formula D or XZ. A + B can however give you AB which is rearrangement of the starting atoms.

24. Chemical equation is balanced when atoms on reactant side and atoms of product side are in equal counts. I have attached a graphic below for more help.

Answer:

A) Metallic bonding

Explanation:

In metallic bonding, electrons exists as "sea of electrons" which means similar to how waves are free to go anywhere in ocean, these electrons are free to roam around the crystal of the metal.

When a component is removed from a reaction system at equilibrium, the equilibrium system will shift to replace some of what was removed.

It states that when a reaction is in equilibrium and one of the factors that affect the rate of reactions is applied, the equilibrium will shift to neutralize the effects of the constraint.

Every equilibrium system obeys Catelier's principle.

Thus, removing one of the components in a reaction that is in equilibrium will make the equilibrium shift to create more of the component being removed.

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Answer:

D : The equilibrium system will shift to replace some of what was removed.

Explanation:

Answer:

organisms in rain water and the number of organisms in pond water because the dependant variable never changes

Explanation:

because the dependant variable never changes

Answer:

If temperature is held constant, the equation is reduced to Boyle's law. Therefore, if you decrease the pressure of a fixed amount of gas, its volume will increase. ... Gay-Lussac's law states that at constant volume, the pressure and temperature of a gas are directly proportional.

Explanation:

i hope this helped

Answer:

3.01 x 10 to the power of 6

Explanation:

Step 1

To find a, take the number and move a decimal place to the right one position.

Original Number: 3,010,000

New Number: 3.010000

Step 2

Now, to find b, count how many places to the right of the decimal.

Answer:

3.01 x 10^6

Explanation:

We start at the farthest right of this number, then shifting it 6 places to the left until we get only one whole digit in our answer. In this case are whole digit would be the number "3" from the millions place written out as 3.01 x 10^6. Because we started at the right of the number and shifted to the left 6 times, we get a positive exponent of "6."

Here is an example of a negative exponent in scientific notation:

Answer:

eyes hair skin

Explanation:

eyes you can get from parents skin and hair

Answer: C. Na2B4O7•10H2O

Explanation:

Hope this helps :)

The formula is tetrasodium borate-Na2B4O7.10H2O

Given- 0.0132 mol Na2B4O7 and 0.1311 mol H2O

Using the molar mass of the anhydrous Na2B4O7 and its mass percentage, we can calculate the molar mass of the hydrate (if we look at it as 100% of the mass) by stoichiometry.

Molar mass of Na = (22.990 g/mol)

Molar mass of B = (10.811 g/mol)

Molar mass of O = (15.999 g/mol)

Molar mass of Na2B4O7= 2⋅22.990 g/mol +4⋅10.811 g/mol +7⋅15.999 g/mol = 201.217 g/mol

201.217g/mol : 52.8%=x g/mol : 100%

​x g/mol = 201.217 g/mol⋅100%÷52.8 %

x g/mol= 381.093 g/mol

In 381.093 g of hydrate, we have 201.217 g of anhydrous Na2B4O7 , the rest of the mass is water.

381.093g−201.217g= 179.876 g of water

Molar mass of H = 1.008 g/mol

Molar mass of O = 15.999 g/mol

Molar mass of  H2O= 1.008 g/mol+ 15.999g/mol  = 18.015 g/mol

179.876g ÷18.015 = 9.98= 10 moles of water per mole of hydrate.

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