all mature polypeptides contain a methionine at the n-terminus. true or false

119 grams of solid magnesium chloride are required to make 250ml of 0.50M solution.

First, we know that a 1 M solution contains

moles of solute per 1.0 L of solution.

This means that a 5.0 M magnesium chloride solution contains 5.0 moles of magnesium chloride (solute) per 1.0 L of solution.

Now all we need to calculate is that the moles of magnesium chloride in solution of 250ml . Hence, the moles of magnesium chloride in 250 ml = 0.250 L of solution is equivalent to 0.50 mol in 1.0 L of solution i.e.,

mol of MgCl₂ / 0.25L = 0.50mol/ 1.0 L

using cross multiplication we get,

moles of MgCl₂ in 250ml solution is 1.24

Now, we can use the number of moles formula to find out the mass of magnesium chloride in solution.

To convert this to grams, number of moles of magnesium chloride = ratio of mass of magnesium chloride to the molar mass of magnesium chloride.

molar mass of magnesium chloride= 95.2 g then mass of magnesium chloride in 250ml solution

= 1.25 × 95.2 = 119g

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Answer:

26,981539 u là khối lượng nguyên tử của AI

Explanation:

It should be noted that when a  reaction is occurring in a test tube, heat transmitted to the surroundings when Molecules collide with the glass, and the glass molecules then transmit that energy to the outside.

Heat can be regarded as a form of energy which is energy that is been transferred as a result of difference in temperature.

In the case above, Molecules collide with the glass, and the glass molecules then transmit that energy to the outside which is an exothermic reaction.

Therefore, option B is correct.

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Answer:

65 million years ago there was a mass extinction that is best known for killing the dinosaurs. There was also a large

deposit of dust that contained substances only found in asteroids, What most likely killed off the dinosaurs?

Explanation:

Answer:

b

Explanation:

Answer:0

Explanation: zero because it is the most stable form of oxygen in its standard state

the relative mass of an atom or molecule is hence considered by considering a mass of a light atom and relating the mass of other atoms or molecules to it

A gas has a capacity of 34 litres and a temp of 35°C, when it once had a quantity of 28, a temperature of 45°A, and an unknown pressure.

A pressure unit is what?

The Metric unit of pressure, the pascal (abbreviated as Pa), is equal to one thomas per sq meter (Y e or kg m-1s-2). Surprisingly, this name was chosen in 1971.

How is pressure measured?

P = F / A, or force per unit of surface area, is the formula for computing pressure. The sign for pressures in physical science is p, and the SI-derived unit for measuring pressure is the pascal (symbol: Pa). One pascal is equal to one Newton per square meter of force applied perpendicularly on a surface.

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Explanation:

the ground state of zinc is

Ar3d¹⁰4s²

thus it has no unpaired electrons

Answer:

Density = 0.27 decagrams/cm³

Explanation:

From conversion tables, we know that;

1 g/cm³ = 0.1 decagrams/cm³

We are given;

Density of aluminium = 2.7 g/cm³

Thus;

Density = 2.7 * 0.1

Density = 0.27 decagrams/cm³

Answer:

270000 decagrams/m³

Explanation:

1.

Density=mass/Volume

=2.7g/1cm3

=(2.7/1000)/(1/1000000)

=2.7x1000

Density=2700kg/ m3

= 270000 decagrams/m³

2.

1000g=1kg

1g=1/1000kg

1cm3= ? m3

100cm=1m

1cm=1/100 m

1cm3=1/1000000 m3

The solution with the highest pH value among these 1M solutions is Ammonium Hydroxide (NH4OH). pH and pOH are terms that are used to describe the acidity and basicity of solutions.

pH is used to measure the acidity of a solution and pOH is used to measure its basicity. The pH and pOH scales range from 0 to 14. A solution with a pH of less than 7 is acidic, while a solution with a pH of more than 7 is basic or alkaline. A 1M solution is a solution that contains 1 mole of solute per litre of solution. The mole is a unit that is used to measure the amount of a substance. In other words, a 1M solution contains 1 mole of the solute dissolved in a litre of the solution.1M solutions with pH values

The following is a list of 1M solutions and their corresponding pH values :Sodium Hydroxide (NaOH) - pH = 14 Potassium Hydroxide (KOH) - pH = 14

Calcium Hydroxide (Ca(OH)2) - pH = 12.5

Ammonium Hydroxide (NH4OH) - pH = 11

Sodium Bicarbonate (NaHCO3) - pH = 8.3

Sodium Carbonate (Na2CO3) - pH = 11

The above mentioned solutions are arranged in descending order of their pH values. Hence, the solution with the highest pH value among these 1M solutions is Ammonium Hydroxide (NH4OH).

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Answer: The answer is B. The pressure inside the tires increased.

Explanation:

The relationship between the pressure, volume, and temperature of a gas is described by the ideal gas law, which is usually written as:

\($$PV = nRT$$\)

where:

- \(\(P\)\) is the pressure,

- \(\(V\)\) is the volume,

- \(\(n\)\) is the number of moles of gas,

- \(\(R\)\) is the ideal gas constant, and

- \(\(T\)\) is the temperature (in Kelvin).

In this case, the volume \(\(V\)\) and the number of moles \(\(n\)\) of air in the tires stay the same. The temperature \(\(T\)\) is increasing. Therefore, for the equation to remain balanced, the pressure \(\(P\)\) must also increase.

So, the answer is B. The pressure inside the tires increased.

React with metal : property of acidic solutions.

PH > 7 : property of basic solutions.

Feels slippery: property of basic solutions

PH = 7: property of neutral solutions.

Tastes sour : property of acidic solutions.

more H+ ions than : property of acidic

OH- ions solutions.

OH- ions & H+ ions : property of neutral

present in equal solutions

amount

PH< 7 : property of acidic solutions.

conducts : property of acid solutions,

electricity property of basic solutions,

in Water property of acid & base

solutions

Tastes bitter : property of basic

solutions.

The antiseptic may affect the results of tests for bilirubin uric acid is Povidone-iodine.

Polyvinylpyrrolidone (povidone, PVP) and elemental iodine combine chemically to form the stable compound known as povidone-iodine. On a dry basis, it has a 9.0% to 12.0% available iodine content. H. A. Shelanski and M. V. Shelanski found this particular complex in 1955 at the Industrial Toxicology Laboratories in Philadelphia.

The compound was discovered to be less harmful to mice than tincture of iodine during in vitro tests to exhibit anti-bacterial efficacy. Clinical tests on humans revealed that the medication outperformed competing iodine formulations. Povidone-iodine was marketed right away and has since taken over as the most widely used iodine antiseptic.

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Povidone-iodine is an antiseptic that may affect the results of tests for bilirubin and uric acid. Povidone-iodine is a commonly used antiseptic that can be applied topically to the skin to reduce the risk of infection during medical procedures. However, it can also interfere with certain laboratory tests, including tests for bilirubin and uric acid.

Bilirubin is a yellow pigment that is produced when red blood cells break down, and it is excreted by the liver. Uric acid is a waste product that is produced when the body breaks down purines. Both bilirubin and uric acid can be measured through laboratory tests to help diagnose certain medical conditions.

However, povidone-iodine can interfere with these tests by reacting with the substances being tested, leading to inaccurate results. It is important for healthcare professionals to be aware of the potential for povidone-iodine to affect laboratory test results and take appropriate measures to minimize this risk, such as avoiding its use immediately prior to testing.

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8.1  will be the pH of a buffer solution containing an acid of pka 7. 5, with an acid concentration exactly one-fourth of that of the conjugate base.

In chemistry, the pH scale is used to define the acidity or basicity of an aqueous solution. Historically, pH stood for the "potential of hydrogen." The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.

A weak acid and the conjugate base of the weak acid, or a weak base and the conjugate acid of the weak base, are combined to form the buffer solution, a water-based solvent solution. They withstand being diluted or having modest amounts of acid or alkali added to them without changing their pH.

A weak base and its salt are combined with a strong acid to create a basic buffer, which has an acidic pH. the aqueous mixture of ammonium hydroxide and ammonium chloride, both in equal concentrations.

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Answer:

i think right artrium but not full aure

Answer:

A

Explanation:

Answer:

A

Explanation:

Not D or B

806.4 milliliters of bromine are required to react completely with 5 grams of 1,2-dimethoxybenzene.

To calculate the number of milliliters of bromine required to react completely with 5 g of 1,2-dimethoxybenzene, we need to determine the molar ratio between bromine and 1,2-dimethoxybenzene, and then convert the mass of 1,2-dimethoxybenzene into moles.

First, let's write the balanced chemical equation for the reaction:

1,2-dimethoxybenzene + Br2 -> 1,2-dibromo-3,4-dimethoxybenzene

From the balanced equation, we can see that 1 mole of 1,2-dimethoxybenzene reacts with 1 mole of bromine.

Next, we need to calculate the number of moles of 1,2-dimethoxybenzene. The molar mass of 1,2-dimethoxybenzene (C8H10O2) is 138.17 g/mol. Using the formula: moles = mass/molar mass, we can calculate:

moles = 5 g / 138.17 g/mol = 0.036 moles of 1,2-dimethoxybenzene

Since the molar ratio is 1:1 between 1,2-dimethoxybenzene and bromine, the number of moles of bromine required will also be 0.036 moles.

Now, we need to convert moles of bromine to milliliters. The molar volume of an ideal gas at standard temperature and pressure (STP) is approximately 22.4 L/mol. This can be converted to milliliters by multiplying by 1000:

22.4 L/mol * 1000 mL/L = 22,400 mL/mol

Finally, we can calculate the number of milliliters of bromine required:

0.036 moles * 22,400 mL/mol = 806.4 mL of bromine

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Answer:

Benzaldehyde (C6H5CHO) is an organic compound consisting of a benzene ring with a formyl substituent. It is the simplest aromatic aldehyde and one of the most industrially useful.

The magnitude of the energy absorbed in the process, 1st shell → 4th shell transition, will vary for a He+ ion compared to a Li2+ ion.

The 1st shell → 4th shell transition is the jump of an electron from the first shell to the fourth shell. The energy of an atom is directly related to the shells and subshells of the atom.

The magnitude of the energy absorbed in the process of 1st shell → 4th shell transition will be more in the case of a Li2+ ion as compared to a He+ ion.

This is because of the fact that the Li2+ ion is more positively charged, hence, the force of attraction experienced by an electron on the 1st shell is more than the force of attraction experienced by an electron on the He+ ion.

The energy required for the transition of an electron from the first shell to the fourth shell in the case of Li2+ ion is more as compared to the energy required for the same transition in the case of a He+ ion. Therefore, the energy absorbed in the process will also be more in the case of Li2+ ion as compared to the He+ ion.

Therefore, we can say that the magnitude of the energy absorbed in the process, 1st shell → 4th shell transition, will vary for a He+ ion compared to a Li2+ ion.


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the half-reactions

cathode : Zn²⁺ (aq) + 2e⁻ ---> Zn (s)  

anode : Mg (s) → Mg²⁺ (aq) + 2e−

a balanced cell reaction

Zn²⁺(aq) + Mg(s)→ Zn(s) + Mg²⁺ (aq)

Given

Zn and Mg electrodes

Required

The half-reactions for a galvanic cell

Solution

To determine the reaction of a voltaic cell, we must determine the metal that serves as the anode and the metal that serves as the cathode.

To determine this, we can either know from the standard potential value of the cell or use the voltaic series

1. voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent

So the metal on the left will easily undergo oxidation and function as anode

Since Mg is located to the left of Zn, then Mg functions as anode and Zn as a cathode

2. Standard potentials cell of Mg and Zn metals :

Mg2+ + 2e– → Mg E° = -2,35 V

Zn2+ + 2e– → Zn E° = -0,78 V

The anode has a smaller E°, then Mg is the anode and Zn is the cathode.

Answer:

Explanation:help

1.37 × 1024 molecules of carbon dioxide will be produced.

The balanced chemical equation for the combustion of acetaldehyde with excess oxygen is given as;`2CH3CHO + 3O2 --> 2CO2 + 2H2O`

Now that we have a balanced equation, we can determine the number of molecules of CO2 that will be produced. The coefficients in the balanced equation represent the mole ratios between the reactants and products, so we can use them to convert between moles of acetaldehyde and moles of carbon dioxide.

Here are the steps:1. Determine the number of moles of acetaldehyde: We can use the given mass and molar mass of acetaldehyde to find the number of moles.`100 g CH3CHO × (1 mol CH3CHO / 44.05 g CH3CHO) = 2.27 mol CH3CHO`

2. Use the mole ratio from the balanced equation to find the number of moles of CO2 produced: From the balanced equation, we can see that 2 moles of CH3CHO produce 2 moles of CO2.

Therefore, the mole ratio is 1:1.`2.27 mol CH3CHO × (2 mol CO2 / 2 mol CH3CHO) = 2.27 mol CO2`3.

Convert moles to molecules: Finally, we can convert the number of moles of CO2 to the number of molecules using Avogadro's number.`2.27 mol CO2 × (6.02 × 1023 molecules/mol) = 1.37 × 1024 molecules of CO2`Therefore, 1.37 × 1024 molecules of carbon dioxide will be produced.

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To make  type of kidney stone, calcium oxalate,  1 mole of CaCl₂ and 1 mole Na₂C₂O₄ as reactants. The products and balance the chemical reaction is  one mole of CaC₂O₄ and two moles of NaCl. The correct option is b.

The Calcium and the oxalate stones make up the majority of the kidney stones. Many of the people who will develop the calcium-containing stones have the excessive calcium in their urine, that is known as the hypercalciuria.

The 1 mole of CaCl₂ and 1 mole Na₂C₂O₄  reaction is as follows :

CaCl₂   +  Na₂C₂O₄  ---->  CaC₂O₄   +  2NaCl

This is the balanced chemical equation. Therefore the option b is correct.

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Answer:

D. The man is the antagonist because he is opposing Buck.

Explanation:

I just took the quiz.

The benzoic acid Collect the top layer dry with Na2SO4 and evaporate the solvent.

Benzoic acid is sparingly soluble in water and forms a precipitate. The benzoic acid can then be separated by suction filtration through a Buchner funnel. Washing with sodium bicarbonate converts the benzoic acid to the more water-soluble form of sodium benzoate, which is extracted into the aqueous layer. Additionally, sodium bicarbonate neutralizes the catalytic acid in this reaction.

Benzoic acid containing the naphthalene impurity can be purified by crystallization in water. The reaction between benzoic acid and NaOH is an acid-base neutralization reaction. An acid reacts with a base to form salt and water. In aqueous solutions, NaOH increases the solubility of benzoic acid. Benzoic acid cannot move from one layer to another because ethanol is immiscible with water.

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Answer:

you can also get oxygen from the mouth but you get more from the nose so i would chose nose

Answer:

Ethene

Explanation:

High-density polyethylene (HDPE) was introduced as a bearing surface in orthopedics in 1962 by Sir John Charnley from Manchester, England. Polyethylene is created through polymerization of ethene. It can be produced through radical polymerization, anionic polymerization, and cationic polymerization

Answer:

What can be said about these common forms of sulphur is that;

(B) They will exhibit same chemical properties

Explanation:

Allotropy is the property of an element to exist in two or more forms in the same physical state

Allotropes have several similar chemical  properties but differ in their physical properties, such as the white, pale yellow to totally colorless diamond and the gray graphite

Sulphur can exist in several allotropic forms, and carbon is the only element that has more allotropes than sulphur

The sulphur allotropes includes S₂, S₆, and S₅ have similar chemical properties but different physical properties.

The correct option is;

What can be said about these common forms of sulphur is that they have the same chemical properties

1. Al₂O₃ is ionic.

2. SnO₂ is molecular.

3. CO₂ is molecular.

4. H₂O is molecular.

5. Fe₂O₃ is ionic.

6. Li₂O is ionic

The following oxides is ionic or molecular:

1. Al₂O₃ (aluminum oxide) is ionic because it is formed by a metal (Al) and a non-metal (O).

2. SnO₂ (tin oxide) is molecular, as it consists of a metal (Sn) and a non-metal (O).

3. CO₂ (carbon dioxide) is molecular since it is composed of two non-metals (C and O).

4. H₂O (water) is molecular as it is formed by two non-metals (H and O).

5. Fe₂O₃ (iron oxide) is ionic because it contains a metal (Fe) and a non-metal (O).

6. Li₂O (lithium oxide) is ionic as it is composed of a metal (Li) and a non-metal (O).

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The n = 5 to n = 3 transition in the bohr hydrogen atom corresponds to the emission of a photon with a wavelength of 1280 nm.

Because it does not account for forces owing to inter-electronic attractions, Bohr's atomic model is only valid for single electron species.

The Bohr Model of the Hydrogen Atom presented the planetary model initially, but an assumption about electrons was subsequently established. The premise was that the structure of atoms could be quantized. Bohr hypothesised that electrons orbited the nucleus in fixed-radius orbits or shells.

Electrons orbit the nucleus in fixed-size, fixed-energy orbits. The orbit's energy is proportional to its size. The smallest orbit has the lowest energy. When an electron travels from one orbit to another, it absorbs or emits radiation.

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