adding impurities of arsenic to germanium will likely... adding impurities of arsenic to germanium will likely... create germanium vacancies with an effective negative charge. increase the electrical conductivity of the germanium by introducing electrons. have no effect on the electrical conductivity of or vacancy concentration in germanium. increase the electrical conductivity of the germanium by introducing holes.

Answer:

silicon

Explanation:

Silicon is at a higher level than germanium, tin, and lead.

Most semiconductors are made up of silicon. Thus, the correct option for this question is D.

A Semiconductor may be defined as a type of solid substance that possesses an electrical conductivity between that of an insulator and a conductor. It has a specific electrical property that allows it to function as a foundation for computers and other electronic devices.

Silicon is the most widely utilized in the manufacturing of semiconductors. Apart from this, germanium, gallium, and arsenide are also used. Among all these elements, germanium was one of the earliest semiconductors material used.

Semiconductors are widely used in the production of Integrated circuits (ICs) and electronic discrete components such as diodes and transistors.

Therefore, most semiconductors are made up of silicon. Thus, the correct option for this question is D.

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For a concentration of PBDEs in herring gull eggs, doubling time for PBDEs in this source is 0.778 yrs. The concentration in 2010 is equals to 44.16 ppm.

We have a concentration of PBDEs in herring gull eggs from the Great Lakes was about 1100 ppb in 1990.

Concentration in 2000 = 7000 ppm

= 7000 × 10³ ppb

We have to doubling time for PBDEs in this source and concentration in 2010.

Time = 10 yr

The rate constant is \(k = \frac{ 2.303 }{t} \frac{ log[a]}{log[a - x]}\),

Plugging the values, \(k = \frac{ 2.303 }{10} log( \frac{ 7000× 10³ }{1100})\)

= 0.875/yr

Doubling time = 0.69/k

= 0.778 yrs.

Now, the we determine the concentration in 2010. Let the concentration be equal x.

\(0.778 = \frac{ 2.303 }{10} log(\frac{ x}{7000 })\)

=> \(\frac{ x}{7000 \: ppm} = 10^{3.8}\)

=> x = 44.16

Hence, required value is 44.16 ppm.

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The environmental hazard that is a product of the natural decay of radioactive substances found in the ground is called Radon gas.

Radon gas is a colorless, odorless, and tasteless gas that is formed when uranium in the soil and rocks breaks down. It can seep into buildings and homes through cracks in the foundation, walls, and floors, and accumulate to dangerous levels. Radon exposure is the leading cause of lung cancer among non-smokers and is a significant health concern in many areas around the world.

While the number of neutrons varies, the number of protons in the atomic nuclei of the component atoms of a specific chemical remains constant. The radioactive components of an element are known as radioisotopes. They can also be referred to as atoms having an excessive amount of electrical energy in their nucleus or unstable neutron-proton pairs. Actual radiation levels are reported using either the Cobalt (Ci), the official machine in the United States, or the Contributes to the Continuing (Bq), the international unit. Life in its entirety split in half.

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Answer:

H

He

Li

Be

B

C

N

O

F

Ne

Na

Mg

Al

Si

P

S

Cl

Ar

K

Ca

Answer:

90g of glucose produce

In plants, the Calvin cycle and gluconeogenesis enzymes are most active under solution conditions with high pH and high [Mg2+]. So the correct option is d) high pH, high [Mg2+].

The optimal pH for the Calvin cycle enzymes in plants is generally slightly alkaline, ranging from pH 7.5 to 8.5, which is typically found in the stroma of chloroplasts. . Magnesium ions are required for the binding of substrates and stabilization of enzyme-substrate complexes in the Calvin cycle. Therefore, high pH and high concentrations of magnesium ions (Mg2+) would be favorable for the activity of Calvin cycle enzymes in plants. It's worth mentioning that the term "gluconeogenesis" is not typically used in the context of plants, as plants primarily undergo photosynthesis to synthesize glucose from carbon dioxide and water,

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Answer:

Electrostatic attraction between oppositely charged ions

Explanation:

involve the formation of an octet of electrons in their valence shells, except for hydrogen which needs a duet of electrons

Answer:

So that we know how many electrons are thre in which shell and how many shells are present in an atom....

Explanation:

Hope it helps!!!

Answer:

2H2O+4NO2+O2=4HNO3

Explanation:

LEFT HAND SIDE(L.H.S)                    RIGHT HAND SIDE(R.H.S)

N=1X10X2  =20                                      N=1X10X2=20

H=2X5X2   =20                                    H=1X10X2=20

O=1X5X2+10X2X2+2 X5                      O=3X10X2=60

   =60

First multiply H2O by 2 to get an even no. of oxygen on L.H.S

make a similar chart at every turn to record the changes in number.

then multiply R.H.S by 2 to equate the hydrogen

multiply N by 2 on LHS to equate them.

the no of O changes

Multiply RHS by 2 again,

equate the LHS by multiplying NO2 by 2 again, i.e total 4

you now have the answer

Answer:

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An electron with quantum numbers n=5, l=0, ml=0, ms=-1/2 is located in the 5s orbital.

The set of quantum numbers given as n=5, l=0, ml=0, ms=-1/2 represents an electron in the 5s orbital. The principal quantum number (n) is 5, which indicates that the electron is in the fifth energy level or shell.

The angular momentum quantum number (l) is 0, which indicates that the electron is in an s orbital (l=0 for an s orbital). The magnetic quantum number (ml) is 0, which specifies the orientation of the orbital in space and indicates that the s orbital is spherically symmetrical (with no preferred orientation).

Finally, the spin quantum number (ms) is -1/2, which indicates that the electron has a spin of -1/2 (i.e., it spins counterclockwise).

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Answer:

Tellurium

Explanation:

Technetium's position on the periodic table is 43 and Tellurium's is 52

Explanation:

14) We need to find the # of moles of NaOH in 3.5 L solution. Note: 1 M = 1 mol/Ll

(3.00 mol NaOH/1 L)(3.5 L) = 10.5 mol NaOH

Next we need find the volume of 19.4M NaOH solution that contains 10.5 mol NaOH:

(10.5 mol NaOH)×(1 L NaOH/19.4 mol NaOH)

= 0.541 L NaOH

This means that 0.541 L (541 mL) of 19.4M NaOH solution must be diluted to 3.5 L in order to get 3.00M NaOH solution.

15) 425 mL (0.425 L) of 0.105M HCl solution contains

(0.105 mol HCl/1 L)×(0.425 L) = 0.0446 mol HCl

so when enough water is added to 1L, the molarity becomes

0.0446 mol HCl/1 L = 0.0446M HCl

16) CaBr2 ---> Ca^+2 + 2Br^-1

For every Ca^+2 ion in the solution, you have 2 Br^-1 ions

If the concentration of CaBr2 is 6 mol/L (or 6M),.then the concentration of Br^-1 irons is

[Br^-1] = 2×[Ca^+2] = 2×(6 mol/L) = 12 mol Br^-1/L

17) The reason you won't need 1.0 L of water is that part of the volume of the solution is taken up by the NaOH so you will always need slightly less than 1 L.

The complete statement is "CH3CHOHCH3 is not an electrolyte in solution." This is further explained below.

Generally,a liquid or gel containing ions that may be broken down by electrolysis, such as the kind used in batteries.

In conclusion, "CH3CHOHCH3 is not an electrolyte in solution," is the whole sentence.

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The reaction that take place when active metals react with acids are:

Active metals are those metals which are very reactive and are found high above hydrogen in the activity series of metals.

The reactivity of metals is determined by the ability of the meta to give up electrons to form positive ions called cations.

Therefore, active metals are those metals that readily give up their electrons to form cations.

The active metals are found in the group 1A and 2A and 3A of the periodic table.

The active metals include; sodium, potassium, calcium, aluminum, magnesium, zinc etc.

The active metals react with dilute acids to displace hydrogen, resulting in the evolution of hydrogen gas.

Considering the given equations, the reactions of the active metals are:

Mg (s) + 2HCl (aq) → MgCl₂ (aq) + H₂ (g)

Zn (s) + 2 HCl (aq) → ZnCl₂ (aq) + H₂ (g)

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The gases that contribute to Earth's greenhouse effect are:

a) CH₄ (methane)

b) CO₂ (carbon dioxide)

c) O₃ (ozone)

d) N₂O (nitrous oxide)

The greenhouse effect is the process by which certain gases in the Earth's atmosphere trap heat and prevent it from escaping into space. These gases, known as greenhouse gases, absorb and emit infrared radiation, thereby contributing to the warming of the planet.

Methane (CH₄) is a potent greenhouse gas released from natural sources like wetlands, as well as human activities such as agriculture and fossil fuel production.

Carbon dioxide (CO₂) is the most well-known greenhouse gas, primarily emitted through the burning of fossil fuels, deforestation, and other industrial processes.

Ozone (O₃), although present in relatively low concentrations in the atmosphere, plays a crucial role in the greenhouse effect. It is mainly found in the stratosphere, where it forms the ozone layer, but it also exists in the troposphere as a result of human activities like pollution.

Nitrous oxide (N₂O) is another greenhouse gas emitted from agricultural and industrial activities, as well as the burning of fossil fuels and solid waste.

Nitrogen (N₂) and oxygen (O₂), which make up the majority of Earth's atmosphere, are not greenhouse gases and do not significantly contribute to the greenhouse effect.

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The liquidus line separates the following combinations of phase fields: Liquid and Liquid + alpha. The correct option is b.

What is a phase field? A phase field is a technique for representing the microstructure of materials. It is used in materials science, mathematics, and computer science to simulate and study the behavior of materials in the solid and liquid phases. It is a multi-component field that contains information on the concentration of various components, their phase, and the local temperature, as well as other relevant variables.

The liquidus line is defined as the boundary between the liquid phase field and the field that includes both the liquid and the alpha phase. As a result, the liquidus line separates the following combinations of phase fields: Liquid and Liquid + alpha.

So, the correct option is b) Liquid and Liquid + alpha.

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Decene has a chemical formula of and has 75 isomers. In this example, all alkanes up to ten carbon atoms in length are meticulously listed starting with methane and proceeding in this manner.

A nuclide isomeric with one or more others is one of two or more molecules, radicals, or ions that have the same number of atoms of the same elements but differ in their structural arrangement and characteristics.

The isomers known as structural isomers have the same chemical formulae but have their atoms totally rearranged in a different order. These are molecules with the same type of molecular formula but various connectivities based on the order in which they are assembled.

Carbon chains have the potential to branch, these isomers are created. For instance, the chemical butane, C4H10, has two isomers. One of them has a "straight chain" of carbon atoms, whereas the other has a branched chain.

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Answer:

I think option (D)is not true

Answer:

Since they're easy to separate, covalent compounds have low melting and boiling points. 2) Covalent compounds are soft and squishy (compared to ionic compounds, anyway). The reason for this is similar to the reason that covalent compounds have low melting and boiling points. When you hit an ionic compound with something, it feels very hard

Explanation:

mark brainliest plz

Explanation:

a.

P. When potassium reacts with hydrochloric acid, the salt produced is potassium chloride and sulphur-di-oxide gas is evolved after performing these.

Q.Addition of acid with metal gives salt and hydrogen gas. When dilute Hydrochloric acid is added to iron filings, so chloride & hydrogen gas is produced.

R. and if you talk about gold, gold do not react easily with HCL

b.

# in ascending order P -> Q -> R

c.

# I think its potassium chloride reaction.

hope this helps you

have a great day :)

During a chemical reaction, reactants always form products.

When certain compounds undergo a chemical reaction, they are transformed into new substances. Reactants are the substances that initiate a chemical process. Products are the substances that are created during the process. Compounds or elements can serve as reactants and products. Chemical equations are used to describe chemical processes.

Rapid or sluggish chemical reactions are both possible.

Reactants are the substances that take part in a chemical process.

Raw elements are reactants because they interact with one another. Under the proper circumstances, such as temperature, time, or pressure, the chemical bonds of the reactants are broken, and the atoms create new bonds that lead to various combinations.

In a chemical reaction,

Reactants → Products.

Therefore, reactants will always form products.

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Answer:

NO2

I got it right

Answer:

For example, the atomic radius of the metal zirconium, Zr, (a period-5 transition element) is 155 pm (empirical value) and that of hafnium, Hf, (the corresponding period-6 element) is 159 pm. ... The increase in mass and the unchanged radii lead to a steep increase in density from 6.51 to 13.35 g/cm3.

Explanation:

Energy of the photon can be found using Rydberg formula = -18.704

The energy difference between two energy levels in a hydrogen atom can be calculated using the Rydberg formula:

E = -13.6 eV * (1/n1^2 - 1/n2^2)

where E is the energy difference in electron volts (eV), and n1 and n2 are the principal quantum numbers of the initial and final states, respectively.

In this case, the initial state has n1 = 7, and the final state has n2 = 3. Plugging these values into the formula:

E = -13.6 eV * (1/7^2 - 1/3^2)

= -13.6 eV * (1/49 - 1/9)

= -13.6 eV * (9/441 - 49/441)

= -13.6 eV * (-40/441)

= 40 * 13.6 / 441 eV

≈ 1.2345 eV

To convert this energy from electron volts (eV) to joules (J), we use the conversion factor 1 eV = 1.6 x 10^-19 J:

E_J = 1.2345 eV * (1.6 x 10^-19 J/eV)

= 1.9744 x 10^-19 J

Now, calculating the log base 10 of this value:

log10(E_J) = log10(1.9744 x 10^-19 J)

≈ -18.704

Rounding this value to three decimal places:

log10(E_J) ≈ -18.704

Therefore, the log (base 10) of the energy of the photon is approximately -18.704 (without units).

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The neutrons that are the products of the chain reaction collide with more of the U-235 to continue the chain reaction

In a chain reaction, the byproducts of one reaction step serve as the reactants for the future reaction stages, creating a continuous and quickly accelerating process. It frequently comes up in discussions about nuclear reactions and chemical processes involving extremely reactive species.

A small number of reactive species or particles are produced in the initiation reaction, which is the first reaction of a chain reaction. The propagation steps are the successive reactions that these reactive species go through where they interact with other molecules or particles to create additional reactive species.

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Answer:

Its density is exactly the same as that of pure stearic acid. Its boiling point is the same as that of pure stearic acid. Its melting point is different from pure stearic acid.