Similarities and Differences in the order in which electrons are filled in s and d subshells.​

Answer:

Spoons are usually made out of steel

Answer:

Aluminum and steel

Explanation:

Answer:

D. Limitations due to ethical concerns about experimental subjects.

Explanation:

Answer:

A

Explanation:

(its my friend)

Answer:

c.

earthquakes along the fault were more frequent in the south than in the north

Carbon Dioxide: CO2

Formula: C + O2

15.0 moles of CO2 contains (15.0 moles CO2) x (1 mole C / 1 mole CO2) = 15.0 moles of C

Carbon Dioxide: CO2

Formula: C + O2

15.0 moles of CO2 contains (15.0 moles CO2) x (2 moles O / 1 mole CO2) = 30.0 moles of O

Calcium Chloride: CaCl2

Formula: Ca + 2Cl

23.0 moles of CaCl2 contains (23.0 moles CaCl2) x (1 mole Cl / 2 moles Cl) = 11.5 moles of Cl

Sulfur Dioxide: SO2

Formula: S + O2

295.0 grams of SO2 contains (295.0 grams SO2) x (1 mole S / 64.066 grams) = 4.6 moles of S

Potassium Sulfate: K2SO4

Formula: 2K + S + 4O

295.0 grams of K2SO4 contains (295.0 grams K2SO4) x (1 mole S / 174.259 grams) = 1.69 moles of S

Iron: Fe

Formula: Fe

565.0 grams of Fe contains (565.0 grams Fe) x (1 mole Fe / 55.845 grams) = 10.15 moles of Fe

metallic elements

SO2 is a covalent compound. It consists of one sulfur atom and two oxygen atoms joined together by covalent bonds, which are strong chemical bonds where electrons are shared between atoms.

H

|

O-H

A water molecule is polar because the electrons are not shared equally between the oxygen and hydrogen atoms. Oxygen is more electronegative than hydrogen, so it pulls the electrons closer to itself, creating a partial negative charge on the oxygen side of the molecule and a partial positive charge on the hydrogen side. This causes the molecule to have a dipole moment and makes the molecule polar.

NH3 (Ammonia) - the molecule is a pyramidal shape, which means that the Nitrogen is at the center and the three hydrogen atoms are located at the three corners of a pyramid.

H2O (Water) - the molecule is a V-shape, this shape is determined by the angle between the two bonding pairs and the two non-bonding pairs of electrons.

CH4 (Methane) - the molecule is tetrahedral shape, the carbon is in the center, and the four hydrogen atoms surround the carbon in a tetrahedral arrangement.

A color change

The formation of a precipitate

The evolution of a gas

A change in temperature

Uday Tahlan

The height of the Eiffel tower after increase in temperature will be 321.06548m.

Temperature increased by 17⁰C

original height of tower is 321m

∆T = 17⁰C

We know that coefficient of thermal expansion for steel 12×10-⁶C-1.

The increase in height is given by

∆h = αh∆T

Putting values in the above equation

∆h = 12×10-⁶× 321 × 17

∆h = 0.065484m

therefore, the height after temperature increase by 17⁰c will be 321.06548m

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Answer:

..... yep

Explanation:

tep no yep no hyshshshss

motion results in the kinetic energy of an object

Answer: \(^{218}_{84}Po \rightarrow ^{218}_{85}At + ^{0}_{-1}e\) is the correct equation for beta decay.

Explanation:

When a beta particle, that is, \(^{0}_{-1}e\) is emitted in a radioactive decay then it is known as beta decay.

Therefore, beta decay of Polonium-218 is as follows.

\(^{218}_{84}Po \rightarrow ^{218}_{85}At + ^{0}_{-1}e\)

Therefore, we can conclude that \(^{218}_{84}Po \rightarrow ^{218}_{85}At + ^{0}_{-1}e\) is the correct equation for the given beta decay.  

Answer:

A

Explanation:

The top dudes answer summed up.

The ddt in the soil with half-life of 12 years needs 44.4 years to decompose.

We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation

N = No(1/2)^(t/t'')

where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.

From the question above, we know that

t'' = 12 yr

N = 15 ppbm

No = 195

By substituting the given parameter, we can calculate the required for decomposing

N = No(1/2)^(t/t'')

15 = 195(1/2)^(t/12)

1/13 = (0.5) ^ (t/12)

t/12 = ⁰'⁵log(1/13)

t/12 = 3.7

t = 44.4 years

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Answer: the total mass number of the reactants should equal the total mass number of the products

Explanation:

I took the quick check

The equation is correctly written if the total mass number of the reactants should equal the total mass number of the products.

This is defined as written representation of the process that occurs during a chemical reaction and consists of the reactant and product parts.

An equation correctly written if it's balanced and it involves the total mass number of the reactants being equal the total mass number of the products.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume = 250 mL

density = 0.789 g/ml

So we have

mass = 250 × 0.789

We have the final answer as

Hope this helps you

Answer

Energy level VI

Explanation

Energy levels which is also called electron shells are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center.

Therefore, when the electron of an atom is in the n = 6 level, this means the electron is in the energy level VI.

Governmental funding for scientific research is essential in advancing our understanding of the world and improving our way of life.

There are several reasons why governmental funding for scientific research is important:1. Scientific research has been a critical component of advancing society. It has helped us to develop new technologies, find cures for diseases, and understand complex systems.2. Governmental funding helps to ensure that scientific research is unbiased and can be conducted without conflicts of interest. This is particularly important when research is being conducted on topics that have the potential to impact public policy.3. Governmental funding is often necessary for scientific research to be conducted at all. This is especially true for basic research, which is research that is conducted to increase our understanding of a topic without a specific goal in mind. Basic research is often not profitable for private industry, so governmental funding is necessary to ensure that it is conducted.4. Scientific research often requires expensive equipment and resources, which can be difficult for individual researchers or small organizations to afford. Governmental funding can help to provide these resources, allowing researchers to conduct more in-depth studies.Governmental funding for scientific research has been instrumental in advancing our understanding of the world and improving our way of life. Without it, many of the technological and medical advancements that we take for granted today would not exist.

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The following descriptions and/or equations best represent the enthalpy change of a system: C. The heat absorbed or released during a phase change or chemical reaction at constant pressure; E. ΔH = ΔE + PΔV; F. H = E + PV.

Enthalpy (H) is a thermodynamic property that represents the total heat content of a system. It takes into account both the internal energy (E) of the system and the work done by or on the system in the form of pressure-volume work (PV).

Option C states that enthalpy change occurs during a phase change or chemical reaction at constant pressure. This is because at constant pressure, the heat absorbed or released by the system is equal to the change in enthalpy.

Option E, ΔH = ΔE + PΔV, represents the equation for calculating the change in enthalpy, where ΔE is the change in internal energy and PΔV is the pressure-volume work done.

Option F, H = E + PV, directly defines enthalpy (H) as the sum of internal energy (E) and pressure-volume work (PV).

These options highlight the relationship between enthalpy, internal energy, and work in the context of phase changes, chemical reactions, and constant pressure conditions.

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Answer:

January 9th 1915

Explanation:

When an asteroid enters the surface of the earth, it gets shattered. The core of a shattered asteroid contains pure metals such as iron and nickel.

Asteroids are present in space in the form of large rocks. The rocks are made up of minerals and metals. Asteroids revolve around the sun in an orbit. Asteroids are also known as small planets. Therefore, these asteroids are made up of materials similar to that of a planet.

Asteroids can be divided into 3 categories:

1) C- Type:- These asteroids contain clays and stony particles.

2) S- Type:- The asteroid will contain silicates and a composition of nickel-iron metal.

3) M-Type:- These have nickel and iron metals.

Along with these materials, dirt and dust are also found inside these small planets.

The correct answer is (C).

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Answer:

C2H2 + 5 O2 = 4 CO2 + 2 H2O

Add / Edited: 27.09.2014 / 25.01.2015

Evaluation of information: 5.0 out of 5 / number of votes: 2

Source: https://chemiday.com/en/reaction/3-1-0-339

Explanation:

The man in the story is not overly concerned with the cold because he is confident that he will be able to build a fire to provide warmth. While this is admirable, it is also quite alarming that he is not more concerned with the risk of frostbite.

Frostbite is a serious condition that occurs when the skin and underlying tissue become very cold, leading to a loss of feeling and discoloration in the affected area. It can be very dangerous and can even lead to amputation if not treated quickly.

Therefore, it is quite absurd that the man is not taking greater precautions against the cold, such as wearing more layers or wearing protective clothing.

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Answer:

d

Explanation:

Taking into account the reaction stoichiometry, 0.2066 grams of CO₂ are formed from 0.500 grams of iron oxide and an excess of carbon.

In first place, the balanced reaction is:

2 Fe₂O₃ + 3 C → 4 Fe + 3 CO₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 319.4 grams of Fe₂O₃ form 132 grams of CO₂, 0.500 grams of Fe₂O₃ form how much mass of CO₂?

\(mass of CO_{2} =\frac{0.500 grams of Fe_{2}O_{3}x132 grams of CO_{2} }{319.4 grams of Fe_{2}O_{3}}\)

mass of CO₂= 0.2066 grams

Then, 0.2066 grams of CO₂ are formed from 0.500 grams of iron oxide and an excess of carbon.

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The number of moles of N2 produced in the reaction is 3.69 moles. To calculate the number of moles of N2 produced in a reaction, we need to use the ideal gas law equation, PV = nRT.

In this equation, P represents pressure, V represents volume, n represents the number of moles, R represents the gas constant, and T represents temperature.
First, we need to convert the temperature to Kelvin by adding 273.15 to 21.5, which gives us 294.65 K.
Next, we need to convert the volume to litres by dividing 110.0 mL by 1000, which gives us 0.110 L.
Now we can plug in the values we have into the ideal gas law equation:
(2.75 atm)(0.110 L) = n(0.0821 L atm/K mol)(294.65 K)
Simplifying this equation, we get:
0.3025 = 0.0821n
To solve for n, we divide both sides by 0.0821:
n = 3.69 moles of N2

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Answer:

ME ADJUA

Explanation:

Relacione consumo e descarte de materiais.

Cu2S, also known as copper(I) sulfide, is an ionic compound.

Ionic compounds are formed through the transfer of electrons between atoms. In the case of Cu2S, copper (Cu) is a metal, and sulfur (S) is a nonmetal. Metals tend to lose electrons to attain a stable electron configuration, while nonmetals tend to gain electrons.

In the formation of Cu2S, copper loses two electrons to form Cu+ ions, and sulfur gains two electrons to form S2- ions.

The resulting Cu+ and S2- ions are held together by electrostatic forces of attraction due to their opposite charges. This electrostatic attraction between the ions forms the ionic bond. In an ionic compound like Cu2S, the atoms are arranged in a crystal lattice structure.

Therefore, Cu2S is classified as an ionic compound.

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When current is allowed to flow, the species that gets oxidized depends on the specific conditions of the system. However, based on the given options, the likely species to be oxidized would be A) Cr₂O₇²⁻.

When current flows in a system, oxidation and reduction reactions occur simultaneously at different electrode surfaces. The species that gets oxidized is the one that loses electrons. In the given options, Cr₂O₇²⁻ and MnO⁴ are both polyatomic ions with high positive oxidation states, while Cr³⁺ and Mn²⁺ have lower positive oxidation states. H³⁺ refers to a hydrogen ion, which is not a likely candidate for oxidation in this context.

In the case of Cr₂O₇²⁻, it has a higher positive oxidation state compared to Cr³⁺. Therefore, it is more likely to undergo oxidation and lose electrons when current is allowed to flow. The half-reaction for the oxidation of Cr₂O₇²⁻ to Cr³⁺ can be represented as follows:

Cr₂O₇²⁻ (aq) → 2Cr³⁺ (aq) + 3e⁻

This reaction involves the reduction of another species, which gains the electrons released during the oxidation of Cr₂O₇²⁻. It's important to note that the actual species being oxidized or reduced can vary depending on the specific conditions of the system, such as pH and the presence of other reactants.

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Explanation:

1) from the periodic table for example if u looking for K it is from the group 1A so the valancey = +1 that is mean it loses one electron to reach a stable state. and this applied for the 1A , 2A, 3A groups.

if u looking for N it is from group 5A so its valency is -3

so it gain 3 electrons to reach a stable state to complete its orbital to 8 electrons. this applied to 5A, 6A,7A

for the transition metals and simimetals other rules.

2) neutral if the element does not hold any charge like

H2, O2, N2, Fe, Au, Cu ...

isotope : if the 2 elements have same symbol and atomic number but they differ in the mass number because the have different numbers of neutrons.

if the element is charged then it is considered as an ion ex: Fe2+ then it is iron cation ( +ion)

F- then it is fluoride anion (-ion)

if u have any doubt just writ a comment ( ;

Answer:

Earned Interest

Explanation:

0.56 V  is the standard potential, e∘cell∘, for this galvanic cell.

The standard reduction potential can be calculated by subtracting the standard reduction potential for the reaction occurring at the cathode from the standard reduction potential for the reaction occurring at the anode. The minus sign is necessary because oxidation is the polar opposite of reduction. The total cell potential can be calculated using the formula E0cell=E0red+E0oxid. Step two is to find a solution. Before the two reactions may be integrated, the number of electrons gained in the reduction must match the number of electrons lost in the oxidation

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#4204.

The standard potential for the given galvanic cell is 0.477 V

The electrode potential is the electromotive force of a galvanic cell built using a standard reference electrode and another electrode whose potential is to be found.

There are two types of electrode potential

Oxidation potential - The potential associated with oxidation reaction is known as oxidation potential

Reduction potential - The potential associated with reduction reaction is known as reduction potential

At the anode, oxidation occurs

\(Sn(s)\rightarrow Sn^{2+}(aq)+2e^-\)

At the cathode, reduction occurs

\(Cu^{2+}(aq)+2e^-\rightarrow Cu(s)\)

\(E^o_{cell} =E^o_{cathode} -E^o_{anode}\)

        = 0.337 - (-0.140)

        = 0.477 V

Thus, The standard potential for the given galvanic cell is 0.477 V

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Disclaimer: The question was given incomplete on the portal. Here is the complete question

Question: What is the standard potential, E∘cell, for this galvanic cell? Use the given standard reduction potentials in your calculation as appropriate.

\(Sn^{2+}(aq)+2e^-\rightarrow Sn(s)\), E°red=−0.140 V

\(Cu^{2+}(aq)+2e^-\rightarrow Cu(s)\), E°red=+0.337 V

Answer:

The substances more alkaline than water are;

1) Spit, 2) Blood, 3) Hand Soap, and 4) Drain Cleaner

Explanation:

The diagram in the simulation displays a list of liquid substances, arranged from bottom to top in the order of increasing alkalinity.

The ph of water is 7.0

The ph of spit (saliva) is between 6.2 and 7.6

The ph of blood is about 7.4

The ph of hand soap is between 9 and 10

The ph of drain cleaner is between 12 and 14.

A solution of buffer with a pH of 8.5 and a pKa of 7.5 would have more capacity to buffer the addition of an acid.

The pH of a solution determines its acidity or alkalinity, with lower pH values indicating greater acidity. In the case of a buffer solution, it consists of a weak acid and its conjugate base or a weak base and its conjugate acid, which resist changes in pH when an acid or base is added.

The pKa of a buffer solution represents the pH at which the weak acid and its conjugate base are present in equal concentrations.

In this scenario, the buffer solution with a pH of 8.5 is more alkaline, indicating a higher concentration of the conjugate base relative to the weak acid. As a result, when an acid is added to the solution, the excess base in the buffer can readily react with the added acid, effectively neutralizing it and maintaining the pH of the solution relatively stable.

This buffer system would have more capacity to buffer the addition of an acid compared to a solution with a lower pH and a closer pKa value, where the concentrations of the acid and base would be closer to each other, resulting in a reduced buffering capacity.

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Answer:

B.

Explanation:

Answer:

B.

email her superviser so that he can respond to the sender's question.