Which element is a metalloid?

A. selenium
B. polonium
C. phosphorus
D. iodine

Charge flowed : 240 Coulombs

Given

t = time = 60 s

I = current = 4 A

Required

Charge

Solution

General formula :

Q = I x t

Q = charge (electricity), C

Input the value :

Q = 4 x 60

Q = 240 Coulombs

The amount of heat absorbed to raise the temperature of 435 grams of water at 1 atm from 25°C to its boiling point, 100°C, is approximately 1.4 × 10^5 joules

What is specific heat?

Specific heat is the amount of heat energy required to raise the temperature of a substance by one unit of temperature per unit of mass. It is a physical property that helps to characterize a substance and is typically measured in units of joules per gram per degree Celsius (J/g°C) or calories per gram per degree Celsius (cal/g°C).

The amount of heat absorbed to raise the temperature of a substance can be calculated using the formula:

Q = mcΔT

where Q is the amount of heat absorbed (in joules), m is the mass of the substance (in kilograms), c is the specific heat capacity of the substance (in joules per kilogram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).

Substituting the given values, we get:

m = 435 grams = 0.435 kg

ΔT = 100°C - 25°C = 75°C

The specific heat capacity of water is 4.184 J/g°C. We can convert this to joules per kilogram per degree Celsius (J/kg°C) by dividing by 1000:

c = 4.184 J/g°C ÷ 1000 = 4.184 J/kg°C

Substituting these values, we get:

Q = (0.435 kg) × (4.184 J/kg°C) × (75°C)

Q = 140,089.2 J

Therefore, the amount of heat absorbed to raise the temperature of 435 grams of water at 1 atm from 25°C to its boiling point, 100°C, is approximately 1.4 × 10^5 joules. The answer closest to this value is option (B).

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The binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond.  Option b

Aminoacyl-tRNA is a complex molecule that plays a crucial role in protein synthesis. It consists of a tRNA molecule covalently linked to an amino acid. The amino acid is attached to the 3' end of the tRNA molecule through an ester bond.

An ester bond is formed between the carboxyl group (-COOH) of the amino acid and the hydroxyl group (-OH) of the ribose sugar at the 3' end of the tRNA molecule. This ester bond is also referred to as an ester linkage. The formation of the ester bond is catalyzed by the enzyme aminoacyl-tRNA synthetase.

The ester bond in aminoacyl-tRNA is essential for protein synthesis. During translation, the aminoacyl-tRNA molecule carries the specific amino acid to the ribosome, where it is incorporated into the growing polypeptide chain. The ester bond is later hydrolyzed, releasing the amino acid for further use in protein synthesis.

In summary, the binding of the amino acid in aminoacyl-tRNA involves the formation of an ester bond between the carboxyl group of the amino acid and the hydroxyl group of the ribose sugar in the tRNA molecule.

Option b

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The molecular formula of the compound that contains only carbon and hydrogen, with 85.6% carbon and has a molar mass of 70 g/mol is C₅H₁₀

C = 85.6%

H = 100 – 85.6 = 14.4%

Divide by their molar mass

C = 85.6 / 12 = 7.13

H = 14.4 / 1 = 14.4

Divide by the smallest

C = 7.13 / 7.13 = 1

H = 14.4 / 7.13 = 2

Thus, the empirical formula of the compound is CH₂

Empirical formula => CH₂

Molar mass of compound = 70 g/mol

Molecular formula = Empirical × n = molar mass

[CH₂]n = 70

[12 + (1×2)]n = 70

[12 + 2]n = 70

14n = 70

Divide both side by 14

n = 70 / 14

Molecular formula = [CH₂]ₙ

Molecular formula = [CH₂]₅

Therefore, the molecular formula of the compound is C₅H₁₀

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The expected boiling point ranking of the given compounds is in the order of highest to lowest will be:

• CH3OH

• CH3Cl

• CH4

The boiling point of a compound is influenced by factors such as the strength of intermolecular forces, molecular weight, and branching. Based on these factors, we can rank the given compounds by their expected boiling point:

• CH3OH (methanol) - Methanol has the highest boiling point among the given compounds due to its ability to form strong hydrogen bonds between its molecules. Hydrogen bonding is a strong intermolecular force that requires a significant amount of energy to break, which results in a higher boiling point.

• CH3Cl (chloromethane) - Chloromethane has a lower boiling point than methanol because it only has dipole-dipole interactions and van der Waals forces between its molecules. These intermolecular forces are weaker than hydrogen bonding, so less energy is required to overcome them, resulting in a lower boiling point.

• CH4 (methane) - Methane has the lowest boiling point among the given compounds because it is nonpolar and only has weak van der Waals forces between its molecules. These intermolecular forces are the weakest, requiring the least amount of energy to overcome, which results in the lowest boiling point.

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The ranking of these compounds by boiling point is:

1. CH3OH (Methanol)

2. CH3Cl (Chloromethane)

3. CH4 (Methane)

1. CH3OH (Methanol) - Boiling Point: 65°C

Methanol (CH3OH) is a colorless and flammable liquid that is the simplest alcohol, with a molecular formula of CH3OH. It is used in antifreeze, as a solvent, and as a fuel. It has a boiling point of 65.0 °C.

2. CH3Cl (Chloromethane) - Boiling Point: -24.3°C

Chloromethane (CH3Cl) is a colorless, flammable gas with a sweet odor. It is used as a solvent and a refrigerant, and has a molecular formula of CH3Cl. It has a boiling point of -24.2 °C.

3.CH4 (Methane) - Boiling Point: -161.5°C

Methane (CH4) is a colorless and odorless gas that is the main component of natural gas. It has the chemical formula CH4 and is the simplest hydrocarbon. It is used as a fuel for heating and cooking, and has a boiling point of -164.0 °C.

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The balanced equation for the reaction between hydrochloric acid and sodium hydroxide is:

HCl + NaOH → NaCl + H2O

For which,  36.53 grams of sodium chloride will form when 25.0 g of hydrochloric acid and 25.0 g of sodium hydroxide are mixed.

The balanced equation for the reaction between hydrochloric acid and sodium hydroxide is:

HCl + NaOH → NaCl + H2O

When 25.0 g of sodium hydroxide is mixed with 25.0 g of hydrochloric acid, the amount of sodium hydroxide is the limiting reagent, since the amount of hydrochloric acid is in excess. To find out how many grams of sodium chloride form, we need to use stoichiometry. Let's start by finding the number of moles of sodium hydroxide we have:

n = m/Mn = 25.0 g / 40.00 g/mol = 0.625 mol

From the balanced equation, we see that the mole ratio between sodium hydroxide and sodium chloride is 1:1. This means that 0.625 moles of sodium chloride will form. Since we know the molar mass of sodium chloride, we can convert moles to grams:

mass = n × M

Mass = 0.625 mol × 58.44 g/mol = 36.53 g

Therefore, 36.53 grams of sodium chloride will form when 25.0 g of hydrochloric acid and 25.0 g of sodium hydroxide are mixed.

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The chemical formula for the cation present in the aqueous solution of Zn(C₂H₃O₂)₂ is Zn²⁺.

In this compound, Zn represents the symbol for zinc, and the subscript 2 indicates that there are two zinc ions present. The acetate ion, acts as the anion in the compound and balances the charge of the cation.

When dissolved in water, Zn(C₂H₃O₂)₂ dissociates into Zn²⁺ cations and C₂H₃O₂⁻ anions. Zinc cations are positively charged due to the loss of two electrons, resulting in a 2+ charge.

These cations are attracted to the negatively charged oxygen atoms in the acetate ions, forming the aqueous solution of Zn(C₂H₃O₂)₂+.

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Q is the heat transferred, m is the mass, C is the specific

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Since we are given the pressure and temperature of the system, we need to find the volume and number of moles of gas.

First, we can find the number of moles of hydrogen that dissociates from the H₂ gas. If the mole fraction of H is 5%, then the mole fraction of H₂ is 95%. Let's assume we start with 1 mole of H₂ . Then, we have:

0.05 moles of H

0.95 moles of H2

Some of the H₂ gas dissociates to H, so let's say x moles of H₂ dissociate. Then, we have:

(0.05 + x) moles of H

(0.95 - x) moles of H₂

Since we are assuming that the only final product is H₂, we know that all of the H atoms will recombine to form H₂:

(0.05 + x - 2x) moles of H₂

(0.95 - x) moles of H2

Simplifying this, we get:

(0.05 - x) moles of H₂

(0.95 - x) moles of H₂

Since we started with 1 mole of H₂, we know that the total number of moles is:

(0.05 - x) + (0.95 - x) = 1 - 2x

Now, we can use the ideal gas law to find the volume of gas at the final pressure and temperature. Since we know the number of moles of gas and the temperature, we just need to find the volume. We can rearrange the ideal gas law to get:

V = (nRT)/P

At 298 K and 1 atm, the gas constant R is 0.08206 L·atm/(mol·K). So, for the initial conditions, we have:

V_initial = (1 mol * 0.08206 L·atm/(mol·K) * 298 K) / 1 atm = 24.4658 L

Now, we can use the mole fractions and the number of moles to find the final volume of gas. We have:

(0.05 - x) moles of H₂

(0.95 - x) moles of H₂

The total number of moles is 1 - 2x, so we have:

(0.05 - x)/(1 - 2x) moles of H₂

(0.95 - x)/(1 - 2x) moles of H₂

Using the ideal gas law again, we can find the final volume:

V final = [(0.05 - x)/(1 - 2x) + (0.95 - x)/(1 - 2x)] * (0.08206 L·atm/(mol·K) * T) / 1.1 atm

Simplifying this, we get:

V final = [1 - 2x] * (0.08206 L·atm/(mol·K) * T) / (1.1 atm)

Now, we need to use the fact that the specific heat is constant to find the final temperature. We can use the formula:

Q = mCΔT

where Q is the heat transferred, m is the mass, C is the specific

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When an electron in a hydrogen atom undergoes the transition from the energy level. The wavelength is 97.3 nm.

The separation between similar points in successive waves of a waveform signal that have traveled across space or along a wire.

1 / λ = -1.097 x 107 m-1 ( 1/nf2 - 1/ni2 )

λ = wavelength in m

nf = final energy level = 1

ni = initial energy level = 7

1 / λ = -1.097 x 107 m-1 (1/16 - 1) = 1.097 x 107 m-1 (-0.9375)

1 / λ = 1.028 x 107 m-1

λ = 9.73x10-8 m = 97.3 nm

Thus, the wavelength, in nanometers, of the spectral line is 97.3 nm.

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Mass of O₂ needed : = 57.408 g

Given

122 g of Aluminum oxide

Required

Mass of Oxygen

Solution

Reaction

4Al + 3O₂ → 2Al₂O₃

Mol Al₂O₃(MW=102 g/mol) :

= mass : MW

= 122 g : 102 g/mol

= 1.196

From the equation, mol ratio of O₂ : Al₂O₃ = 3 : 2, so mol O₂ :

= 3/2 x mol Al₂O₃

= 3/2 x 1.196

= 1.794

Mass O₂ (MW = 32 g/mol) :

= mol x MW

= 1.794 x 32

= 57.408 g

After shaking with D₂O, the spectrum of ethanol shows two proton signals. The OH signals will no longer exist.

Three peaks may be seen in the ethanol 1H-NMR spectra. The following are the chemical shifts (Image 1).

The spectrum of ethanol after shaking with D₂O shows only two peaks. After shaking with D₂O, the peak that corresponds to OH disappears at this point. The following are the chemical shifts (Image 2).

At around 3.57 ppm, a water peak forms while the -OH resonance totally vanishes. This happens as a result of leftover H₂O and HOD in the D₂O bottle and traded out hydroxy protons (-OH), which now produce more H₂O.

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The molarity of the RbOH solution is 1.52 M.

Balanced chemical equation for the neutralization reaction between RbOH and HBr is;

RbOH + HBr → RbBr + H₂O

From the balanced equation, we can see that the stoichiometric ratio of RbOH to HBr is 1:1.

We can use the equation for molarity, which is;

Molarity (M) = moles of solute / volume of solution in liters

We can first calculate the moles of HBr that were used in the neutralization reaction;

moles of HBr = Molarity × volume of HBr solution in liters

moles of HBr = 1.385 M × 0.02435 L

moles of HBr = 0.0337 mol

Since the stoichiometric ratio of RbOH to HBr is 1:1, the moles of RbOH in the solution is also 0.0337 mol.

Now, we can calculate the molarity of the RbOH solution using the volume of the RbOH solution;

Molarity of RbOH = moles of RbOH/volume of RbOH solution in liters

Molarity of RbOH = 0.0337 mol / 0.0221 L

Molarity of RbOH = 1.52 M

Therefore, the molarity of the RbOH solution is 1.52 M.

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Answer: Water is the solvent in this recipe.

Explanation: A solvent is " a molecule that has the ability to dissolve other molecules". Lemon juice and sugar are solutes.

Answer:

Models

Explanation:

Answer:

Mechanical weathering

A. does not change rock composition

C. abrasion

F. ice wedging

Chemical weathering

B. oxidabon

D. changes rock composition

E. acid rain

Explanation:

In the column of mechanical weathering folowing points came does not change rock composition, ice wedging and abrasion.

Weathering is a phenomenon in which break down or cracking of rocks takes place due to various reasons.

Abrason is a kind of mechanical weathering as in this proces due to rubbing of a rack againt abother object causes weathering. And ice wedging is also a mechanical weathering because of the expansion of water it takes place.

Acid rain and oxidabon is a process in which rock changes its structure due to chemical reaction.

Hence division of weathering is done above properly.

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B

The sodium hydroxide (NaOH) solution is a basic solution, so the pH of that solution should be close to 14

then when adding hydrochloric acid (HCl) we start to neutralice the solution, meaning the pH must sift slowly to lower pH.

Assuming both solutions have similar concentration the pH shall shift form basic (above 7) to acid pH (below 7). Until now both B and D images agreed with the explanation given. To chose between them we need to remember that HCl is a very strong acid, which means that in solution will get to very acid solutions (very low pH values) which leaves only B as possible answer

Answer: look down hope I helped

Explanation:

1) First convert to pOH as OH is the dissociating species in a base equilibrium.pH + pOH = 14 (at 25 C)pH=13, hence pOH = 1,Hence [OH] = 10^-1 Mdiluting by factor of 10 with pure water gives [OH] = 10^-2 MThe new pOH = 2, hence the new pH is 12In general, dilution (with pure water) by a factor of 10 moves the pH 1 unit in the direction of the pH of water (pH 7). i.e. it moves up for acids, down for bases.(At infinite dilution of either acids or bases, you’d have pure water - obvious when you think of it like that)

The statement "100% iodine and 95% alcohol are rapidly effective disinfectants" is False.

What are disinfectants?

Disinfectants are chemical agents that can destroy or remove harmful microorganisms, viruses, and bacteria from various surfaces, areas, and substances. The effectiveness of a disinfectant can be determined by its ability to kill bacteria, viruses, and other microorganisms effectively.

What are the effective disinfectants?

The following are the effective disinfectants: Chlorine. Chlorine is one of the most effective disinfectants, as it has a broad spectrum of antimicrobial activity. It is highly effective against bacteria, viruses, and fungi, among other microorganisms. Iodine. Iodine is another effective disinfectant, but it has a narrow range of antimicrobial activity. It is highly effective against bacteria, viruses, and fungi.Alcohol. Ethanol and isopropanol are two types of alcohol that are commonly used as disinfectants. They have broad-spectrum antimicrobial activity, making them effective against bacteria, viruses, and fungi.

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Co oxidises to Co after reducing Ni to Ni (0). (III). Co is a reducing agent,

3Ni2+(aq)+2Co(s)⟶2Co3+(aq)+3Ni(s)

The charge that indicates an object's capacity to gain, lose, or share electrons is known as the oxidation number.

Increasing the number of oxidations is oxidation.

Co is oxidised, changing from Co(0) to Co. (III).

Decrease in oxidation number equals reduction.

Ni (II) is reduced to Ni2+ from Ni2+ (0).

An oxidising agent is something that reduces itself while oxidising others.

Ni2+ reduces itself to Ni after oxidising Co to Co (III) (0). Ni2+ is an oxidising agent, then.

A reducing agent is something that both reduces other things and oxidises itself.

Co oxidises to Co after reducing Ni to Ni (0). (III). Co is a reducing agent, then.

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After reducing Ni to Ni, Co oxidises to Co. (0). (III). Co is a decreasing agent. 3Ni2+(aq)+2Co(s)⟶2Co3+(aq)+3N The oxidation number is the charge  shows an object's ability to receive, lose,  share electrons.

Oxidation is the process of increasing the number of oxidations.Co undergoes oxidation, transforming from Co(0) to Co. Reduction is equal to a decrease in the oxidation number. From Ni2+, Ni (II) is reduced to Ni2+ (0). An oxidising agent is anything that oxidizes others while reducing itself. After oxidizing Co to Co (III), Ni2+ decreases to Ni (0). Ni2+ is therefore an oxidizing agent. A reducing agent is anything that both reduces and oxidizes other substances. After reducing Ni to Ni, Co oxidises to Co. (0). (III). Co is a decreasing agent.After reducing Ni to Ni, Co oxidises to Co. (0). (III). Co is a decreasing agent. 3Ni2+(aq)+2Co(s)⟶2Co3+(aq)+3N The oxidation number is the charge  shows an object's ability to receive, lose,  share electrons.

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Answer:

Well, you'd have 1 electron more than protons (since there are 10 protons and 11 electrons). So the previously neutral ion has now become an ion with a -1 charge

Answer:

2.23L

Explanation:

Using the general gas law as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas constant (0.0821 Latm/molK)

T = temperature (K)

According to the information provided in this question,

Mass of nitrogen = 2800mg

Since 1g = 1000mg

2800mg = 2800/1000

= 2.8g

Using mole = mass ÷ molar mass

Molar mass of nitrogen gas (N2) = 28g/mol

mole = 2.8/28

mole of N2 gas = 0.1mol

Pressure = 98kPa

1 kilopascal (kPa) = 1000pascal (pa)

98kPa = 98 × 1000

= 98000pascal

Since 1 Pascal = 9.869 × 10^-6 atmosphere (atm)

98000pascal = 98000 × 9.869 × 10^-6

= 0.967atm

Temperature = -10°C

Kelvin = °C + 273

Kelvin = -10 + 273

K = 263K

Hence, using PV = nRT

0.967 × V = 0.1 × 0.0821 × 263

0.967V = 2.159

V = 2.159/0.967

V = 2.23

Volume of Nitrogen gas = 2.23 L

Answer:

This means that all cells are created from mitosis. A cell creates a copy of itself and forms two daughter cells. All cells are created from life that already exists, they don't form spontaneously.

Explanation:

Not exactly sure what the question is because the explanation is kind of in the question but hope I could help!! <3

The major products formed when benzene reacts with the following reagents are :

(a) tert-butylbenzene

(b) bromobenzene

(c) mixture (ortho-nitrobenzene, meta-nitrobenzene, para-nitrobenzene)

(d) benzaldehyde

(e) nitrobenzene

(a) The major product formed when benzene reacts with tert-butyl bromide and \(AlCl_3\) is tert-butylbenzene.

(b) The major product formed when benzene reacts with bromine and a nail (iron) is bromobenzene.

(c) The major product formed when benzene reacts with iodine and \(HNO_3\) is a mixture of ortho-nitrobenzene, meta-nitrobenzene, and para-nitrobenzene.

(d) The major product formed when benzene reacts with carbon monoxide, HCl, and \(AlCl_3\)/CuCl is benzaldehyde.

(e) The major product formed when benzene reacts with nitric acid and sulfuric acid is nitrobenzene.

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Answer:

Some important achievements of chemistry includes discovery of oxygen ;Atomic Theory; Atoms Combine Into Molecules ;Synthesis of Urea; Chemical Structure ; Periodic Table of the Elements; Electricity Transforms Chemicals ; The Electron etc.

Chemistry is a field of science which deals with the chemicals present in laboratory or in our environment o related to human body also.

There are main 3 branches of chemistry that is organic and inorganic and physical chemistry some others are too like analytical chemistry ,industrial chemistry , pharmaceutical chemistry.

Organic chemistry deals with the carbon compounds and hydrogen compound inorganic chemistry deals with the elements of periodic table and pharmaceutical makes medicines for human health care. The reasons  for people to pursue discoveries in chemistry because it is the most important part of  daily life and related to the human health too.

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The complete question

Mention some important achievements of chemistry

Answer: b. 14.2%

Explanation: I'm not sure if it's correct but I did it this way. Since we have a 25.0 gram of magnesium oxide by the name of it we should know that the 25.0 gram is composed of magnesium and oxygen. It tells us that we have 10.8 grams of magnesium. Therefore we can subtract 25.0- 10.8 = 14.2 so our answer would be 14.2% of oxygen.

Answer:One mile is also equal to 5,280 feet or 1,760 yards. The mile is a US customary and imperial unit of length. Miles can be abbreviated as mi, and are also sometimes abbreviated as m. For example, 1 mile can be written as 1 mi or 1 m. Inches. An inch is a unit of linear length measure equal to 1 / 12 of a foot or 1 / 36 of a yard.

Explanation:

Answer:There are many problems that result from this method of growing crops, including deforestation, a direct consequence of cutting down forests for crop land; loss of habitat and species; an increase in air pollution and the release of carbon into the atmosphere—which contributes to global climate change; and an increase

Explanation: