What kind of reaction is the conversion of cysteine to cystine?.

The molarity of calcium hydroxide if 15 ml of the solution is neutralized by 15.8 ml of. 90M phosphoric acid​ is 0.22 M.

The balanced chemical equation for the reaction between calcium hydroxide and phosphoric acid is:

Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + 2H₂O

The molar ratio of calcium hydroxide to phosphoric acid is 1:3.

The volume of the phosphoric acid solution is 15.8 mL and the molarity of the phosphoric acid solution is 0.90 M.

Use the following equation to calculate the moles of phosphoric acid:

moles of H₃PO₄ = molarity × volume

moles of H₃PO₄ = 0.90 M × 15.8 mL

moles of H₃PO₄ = 14.22 mmol

Since the molar ratio of calcium hydroxide to phosphoric acid is 1:3, the moles of calcium hydroxide is 1/3 of the moles of phosphoric acid.

moles of Ca(OH)₂ = moles of H₃PO₄ / 3

moles of Ca(OH)₂ = 14.22 mmol / 3

moles of Ca(OH)₂ = 4.74 mmol

Use the following equation to calculate the molarity of calcium hydroxide:

molarity of Ca(OH)₂ = moles of Ca(OH)₂ / volume

molarity of Ca(OH)₂ = 4.74 mmol / 15 mL

molarity of Ca(OH)₂ = 0.28 M

Therefore, the molarity of calcium hydroxide is 0.22 M.

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Answer:

What is the heat in joules required to raise the temperature of 25 grams of water from 0 degrees C to 100 degrees C? What is the heat in calories? Answer: 10450 J or 2500 calories of heat energy are required to raise the temperature of 25 grams of water from 0 degrees C to 100 degrees C.

Answer:

Explanation:

428 x 10³ Pa = 4.28 x 10⁵ Pa = 4.28 atm

We shall use the gas equation

P₁V₁ / T₁ = P₂V₂ / T₂

7.66  x 10 / ( 273 + 27 ) = 4.28 x 30 / T₂

.255 = 128.4 / T₂

T₂ = 503.53

= 503.53 - 273 = 230.53⁰C .

Answer:

See explanation

Explanation:

Even though the image is missing here but i believe that the other pancakes are at different temperatures. If this is the case, the pancake at the highest temperature will make the bottom pancake the warmest due to transfer of thermal energy.

The transfer of thermal energy between the hotter pancake and the bottom pancake occurs by conduction. Conduction is a mode of transfer of thermal energy that occurs when the two bodies are in close contact with each other.

After they have been touching for a while, the temperature of the bottom pancake increases while the temperature of the top pancake decreases since thermal energy is being transferred from the top pancake to the bottom pancake.

The information regarding the energy and the temperature should be explained below:

The following information should be considered:

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Answer:

BF 3

Explanation:

The geometry of the BF 3 molecule is called trigonal planar The fluorine atoms are positioned at the vertices of an equilateral triangle. The F-B-F angle is 120° and all four atoms lie in the same plane.

Answer:

BF3

Explanation:

A p ex

The number of atoms in a 27.5g iron ring has the same number in a nickel ring of the same mass as their ratio is 0.9311.

No of atoms = given mass/molar mass * Av no

so

N i / Nchro = Mcrome/ Miron

Ni / Nchro =   51.9961/ 55.845 = 0.9311

Each atom consists of a nucleus and one or greater electrons bound to the nucleus. The nucleus is fabricated from one or extra protons and some of each neutron. Most effective the most common variety of hydrogen has no neutrons. every strong, liquid, fuel, and plasma is composed of impartial or ionized atoms.

Atoms encompass 3 essential sorts of particles, protons, electrons, and neutrons. Neutrons and protons have about the same mass and in contrast to this, the mass of an electron is negligible. A proton incorporates a superb price, a neutron has no charge and an electron is negatively charged.

Atoms be a part of collectively forming molecules. A water molecule has 3 atoms: two hydrogens (H) atoms and one oxygen (O) atom. that is why water is every so often known as H2O. An unmarried drop of water consists of billions of water molecules.

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The statement provided in the question regarding Oxidative phosphorylation is True.

Oxidative phosphorylation is a process that involves the flow of electrons through the electron transport chain, a series of proteins and electron carriers within the mitochondrial membrane. The flow of electrons allows the electron transport chain to pump protons to one side of the mitochondrial membrane, creating a proton-motive force, a type of electrochemical pressure. This pressure is then relieved through specialized protein complexes, which capture the energy of the protons as they flow back to the other side of the membrane. This energy is used to produce ATP, the primary energy currency of cells. The process of oxidative phosphorylation is an essential step in cellular respiration, and it occurs in the mitochondria of eukaryotic cells and the plasma membrane of prokaryotic cells.

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The correct answer is, "Micelles are suspended in water and carry away dirt."

Micelles, which are suspended in water, remove dirt. Soap contains a lengthy hydrophobic tail and polar hydrophilic head group. A micelle is a globular collection of soap molecules. In soil, nonpolar hydrocarbons are drawn. In water, micelles hold dirt in place.

Grease is solubilized by a detergent, which then emulsifies it with water.

The most typical cleaning agent is a detergent. Each detergent has  hydrophilic head and hydrophobic tail. The detergent can dissolve in water because the hydrophilic head can interact with it. It can interact with grease because of its hydrophobic tail.

In order to dissolve the grease, a detergent's molecules clump together to form micelles. Grease is totally removed by mechanical scrubbing by emulsifying it with water.

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Answer:

10 atoms

( 5 molecules )......

Answer: Hello sir, hope you are having a good day, I have came to tell you your answer needs a picture so we can answer it or otherwise we will be wrong

Explanation:

A large group of chemical elements that contains many metals which are not highly reactive such as copper, iron, and tungsten is called: Transition metals.

​

Transition metals can be defined as a chemical element that has a partially filled d-orbital or is capable of producing cations with an incomplete d-orbital (subshell).

Hence, a transition metal refers to a large group of chemical elements that are found in the d-block of the periodic table such as Group III to Group XII elements.

In Chemistry, some examples of transition metals include the following:

In conclusion, transition metals comprises of many metals which are not highly reactive such as tungsten, iron and copper.

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Based on the bond energies given, the enthalpy change for the reaction of is -33 kJ and the reaction is exothermic.

The change in bond energy of a reaction is calculated using the formula below:

A reaction is exothermic if the change in bond energy is negative.

A reaction is endothermic if the change in bond energy is positive.

Given the bond enery values above:

sum of energies of bonds broken = 4 × C-H + Br-Br

sum of energies of bonds broken = 4 × 413 + 193 = 1845 kJ

sum of energies of bonds formed = 3 × C-H + C-Br + H-Br

sum of energies of bonds formed = 3 × 413 + 276 + 363 = 1878 kJ

Thus;

change in bond energy = 1845 - 1878 = -33 kJ

Therefore, the enthalpy change for the reaction of is -33 kJ and the reaction is exothermic.

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When the bath is filled to within 2.35 inches of the top, there are about 804 litres of water within.

To ensure that the units are constant, let's first convert the water bath's measurements from metres to centimetres:

Length = 1.45 m x 100 cm/m = 145 cm

Width = 0.870 m x 100 cm/m = 87.0 cm

Depth = 0.700 m x 100 cm/m = 70.0 cm

Next, we must calculate the water's height in centimetres:

The height of water equals the total bath height less the height from the top.

Height of water = (70.0 cm) - (2.35 in x 2.54 cm/in) = 64.8 cm

The volume of water = Length x Width x Height of water

Volume of water = (145 cm) x (87.0 cm) x (64.8 cm) = 804,276 cm^3

Since there are 1000 cm^3 in 1 litre, we can convert the volume of water to litres:

Volume of water = 804,276 cm^3 ÷ 1000 cm^3/L = 804.276 L

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Answer:

Explanation:

Exothermic Reactions

Exothermic Reactions

This means that the energy required to break the bonds in the reactants is less than the energy released when new bonds form in the products. Excess energy from the reaction is released as heat and light. Figure: Chemical reaction: A Hermite reaction, which produces molten iron.

Finding electrons is a fundamental concept in the study of physics and chemistry. Electrons are the negatively charged particles that orbit the nucleus of an atom. They are the building blocks of matter and are responsible for many of the properties and behavior of materials.

One way to find electrons is through a cathode ray tube. A cathode ray tube is a device that uses an electric current to create a stream of electrons that can be directed toward a screen. This is the basic principle behind old-fashioned televisions and computer monitors. The electrons in the cathode ray tube cause the phosphors on the screen to glow, creating the image we see.

Another way to find electrons is through a scanning electron microscope. A scanning electron microscope is an instrument that uses a beam of electrons to produce high-resolution images of the surface of a material. This allows scientists to see the details of the surface at a tiny scale and to study the properties of electrons on the surface.

A third way to find electrons is through a particle accelerator. A particle accelerator is a machine that uses high-energy electromagnetic fields to accelerate particles, such as electrons, to very high speeds. These high-speed electrons can then be directed toward a target, where they can be used to study the properties of atoms and molecules.

Overall, there are many ways to find electrons and study their properties, from the cathode ray tube, scanning electron microscope, and particle accelerator, to other methods such as electron diffraction and electron microscopy. Each method offers different advantages and allows scientists to study electrons differently.

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Answer:

The right option is the 4 one. nucleoid

Prokaryotic cells are simple cells that lack a definite nucleus and some membrane-bound organelles. Prokaryotic cells have a nucleoid region, which is an irregularly-shaped central region of the cell that contains the cell’s genetic information (DNA). Other organelles that can be found in prokaryotic cells include plasma membrane, cell wall, cytoplasm, and ribosomes.

Explanation:

Answer:

nucleoid

Explanation:

Answer:

những lựa chọn ở đâu?

Explanation:

Hy vọng nó sẽ giúp ích;>

The final temperature of the bottle will be 279.81 K, equivalent to approximately 6.66 °C.

The combined gas law, which links a gas's pressure, volume, and temperature, can be used to address this issue:

Where P₁, V₁, and T₁ are the gas's beginning pressure, volume, and temperature, respectively, and P₂, V₂, and T₂ are the gas's ultimate pressure, volume, and temperature, respectively, the equation is P₁V₁/T₁ = P₂V₂/T₂.

Since the bottle is a hard container in this situation, we may infer that its capacity stays constant. As a result, the combined gas law may be expressed as follows: P₁/T₁ = P₂/T₂, where P₁, T₁, and T₂ have the same values as previously.

The beginning pressure may be converted to mm Hg, the same units as the final pressure:

P₁ is equal to 100 kPa, 100000 Pa, or 750.06 mm Hg.

P₂ = 702 mm Hg

Since the temperature must be in kelvin in the combined gas law

calculation, we may also convert the starting temperature to kelvin:

T₁ = 25.0 + 273.15 = 298.15 K

Currently, we can determine the final temperature, T₂:

P₁/T₁ = P₂/T₂ T₂ . T₂ = P₂, while T₁/P₁ T₂ = (702 mm Hg) (298.15 K) / (750.06 mm Hg)

T₂ = 279.81 K

where the definitions of P₁, T₁, P₂, and T₂ remain the same.

Therefore, the final temperature of the bottle will be 279.81 K, equivalent to approximately 6.66 °C.

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10.63 grams of ZnO remain after the reaction is complete.

The balanced chemical equation for the reaction between zinc oxide and water is:

ZnO(s) + H2O(l) → Zn(OH)2(aq)

No. of moles of ZnO = Mass of ZnO / Molar mass of ZnO= 35.0 g / 65.38 g/mol= 0.535 moles of ZnO

The amount of water is given as 6.85 g

The molar mass of water is:H2O = 18.02 g/mol

No. of moles of H2O = Mass of H2O / Molar mass of H2O= 6.85 g / 18.02 g/mol= 0.380 moles of H2O

Now, we need to find out the limiting reagent.

.No. of moles of Zn(OH)2 formed from 0.535 moles of ZnO = 0.535 molesNo. of moles of Zn(OH)2 formed from 0.380 moles of H2O = 0.380 moles

Therefore, since the amount of ZnO (0.535 moles) is greater than the amount of H2O (0.380 moles), H2O is the limiting reagent and ZnO is the excess reagent.

The maximum amount of Zn(OH)2 that can be formed is given by the amount of ZnO that reacts with H2O, which is 0.380 moles.

No. of grams of Zn(OH)2 = No. of moles of Zn(OH)2 × Molar mass of Zn(OH)2= 0.380 mol × (97.41 g/mol)= 37.08 gThe formula for the limiting reagent is H2O. The amount of excess reagent remaining after the reaction is complete can be calculated by subtracting the amount of limiting reagent used from the initial amount of excess reagent

.Initial amount of excess reagent (ZnO) = 35.0 g

No. of moles of ZnO = Mass of ZnO / Molar mass of ZnO= 35.0 g / 65.38 g/mol= 0.535 moles of ZnO

Amount of ZnO used in the reaction = No. of moles of Zn(OH)2 formed × Ratio of ZnO to Zn(OH)2= 0.380 mol × (1 mol ZnO / 1 mol Zn(OH)2)= 0.380 moles of ZnO used

Amount of ZnO remaining after the reaction = Initial amount of ZnO − Amount of ZnO used= 35.0 g − (0.380 mol × 65.38 g/mol)= 10.63 g

Therefore, 10.63 grams of ZnO remain after the reaction is complete.

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The volume of 3M from making stock solution is 7.5 liters.

To make a 3M solution from a 6M stock solution of AgNO3, we need to add water to the stock solution. Let us assume x liters of 3M solution from 5 liters of the 6M stock solution.

The amount of AgNO3 in the 5 liters of the stock solution is:

5 L * 6 mol/L = 30 mol AgNO3

To make a 3M solution, we need:

3 mol/L * x L = 3x mol AgNO3

We can use the formula:

C1V1 = C2V2

where,

C1 = concentration of the stock solution

C2 = concentration of the final solution

V1 = volume of stock solution

V2 = volume of the final solution

In this case, we know that:

C1 = 6 M

C2 = 3 M

V1 = x

V2 = 5 L + x

In this case, we know that:

C1 = 6 M

C2 = 3 M

V1 = x

V2 = 5 L + x

let us substitute the above values in the formula

6 M * V1 = 3 M * (5 L + x)

Solving for x, we get:

x = 2.5 L

Therefore, to make a 3M solution from a 6M stock solution, a final volume of 5 + 2.5 = 7.5 liters to get a 3M solution.

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Answer:

stochiometry works with measuring quantitative relationships and used to determine the amount of products and reactants that are produced or needed in a reaction

Answer:

Stoichiometry is the calculation of reactants and products in chemical reactions in chemistry. Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals.

Among the types of radiation, alpha, beta, gamma, and x-ray, the one that requires the least amount of protective clothing is x-ray radiation.

X-rays are a form of electromagnetic radiation, and they have a shorter wavelength than gamma rays, which means that they carry less energy. As a result, they are less harmful to living tissues and do not require as much protection. In many cases, only a lead apron or a lead vest is needed to shield the patient from x-rays during medical procedures.
Alpha and beta radiation, on the other hand, are particles that can cause significant damage to living tissues and require more extensive protective measures, such as gloves, masks, and full-body suits. Gamma radiation is also highly penetrative and requires thick layers of lead or concrete to shield against it.
In summary, x-ray radiation is the type of radiation that requires the least amount of protective clothing due to its lower energy and shorter wavelength compared to other types of radiation. However, it is still important to take appropriate safety precautions when working with x-rays to minimize exposure and potential harm.

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Answer:

n=mass/molar mass

mass=?,molar mass=12+(35.5)4=154g/mol.n=4.63x10²

mass=4.63x10²x154=7128g

23.88  grams of fe2o3 are formed when 16.7 g of fe reacts completely with excess o2.

According to the synthesis reaction 4Fe + 3O₂ → 2Fe₂O₃, we need to determine how many grams of Fe₂O₃ are formed when 16.7 g of Fe reacts completely with excess O₂.

Step 1: Determine the molar mass of Fe and Fe₂O₃.
Fe: 55.85 g/mol
Fe₂O₃: (2 × 55.85) + (3 × 16.00) = 159.69 g/mol

Step 2: Convert grams of Fe to moles of Fe.
moles of Fe = (16.7 g) / (55.85 g/mol) = 0.299 moles

Step 3: Use the stoichiometry of the reaction to determine moles of Fe₂O₃ produced.
The reaction shows that 4 moles of Fe produce 2 moles of Fe₂O₃. Therefore,
moles of Fe₂O₃ = (0.299 moles Fe) × (2 moles Fe₂O₃ / 4 moles Fe) = 0.1495 moles Fe₂O₃

Step 4: Convert moles of Fe₂O₃ to grams of Fe₂O₃.
grams of Fe₂O₃ = (0.1495 moles) × (159.69 g/mol) = 23.88 g

23.88 g of fe203 is formed.

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Takealot excels at providing convenience, extensive product selection, competitive pricing, and a seamless online shopping experience as its value proposition for consumers.

Convenience is a key aspect of Takealot's value proposition. As an online retailer, Takealot offers the convenience of 24/7 shopping from the comfort of one's own home.

Customers can browse a wide range of products, place orders, and have them delivered directly to their doorstep.

Takealot also offers an extensive product selection, spanning various categories such as electronics, fashion, home goods, and more.

This breadth of choices allows consumers to find and compare different products all in one place, saving them time and effort compared to traditional retailers with limited inventory.

Competitive pricing is another area where Takealot excels. By operating online, the company has lower overhead costs compared to brick-and-mortar retailers, enabling them to offer competitive prices and discounts to their customers.

The seamless online shopping experience provided by Takealot includes user-friendly interfaces, secure payment options, and efficient delivery services. This enhances customer satisfaction and convenience.

In contrast, traditional non-online retailers typically have limited operating hours, smaller product selections, and may not offer the same level of convenience and competitive pricing.

They often require customers to physically visit their stores, which can be time-consuming and may not provide the same level of ease and accessibility as online platforms like Takealot.

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Answer: a)Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

b) Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

c) Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

Explanation:

(a) Balanced formula equation:

(NH₄)₂S + FeSO₄ → (NH₄)₂SO₄ + FeS

Complete ionic equation:

2NH₄⁺ + S²⁻ + Fe²⁺ + SO₄²⁻ → 2NH₄⁺ + SO₄²⁻ + FeS

Net ionic equation:

Fe²⁺ + S²⁻ → FeS

(b) Balanced formula equation:

Na₂SO₃ + CaCl₂ → NaCl + CaSO₃

Complete ionic equation:

2Na⁺ + SO₃²⁻ + Ca²⁺ + 2Cl⁻ → 2Na⁺ + 2Cl⁻ + CaSO₃

Net ionic equation:

SO₃²⁻ + Ca²⁺ → CaSO₃

(c) Balanced formula equation:

CuSO₄ + BaCl₂ → CuCl₂ + BaSO₄

Complete ionic equation:

Cu²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Cu²⁺ + 2Cl⁻ + BaSO₄

Net ionic equation:

Ba²⁺ + SO₄²⁻ → BaSO₄

The curve represents saturation. Below the curve, the water is unsaturated. Above the curve, water is supersaturated. This means that more solute is present than the water can contain.

The line of the solubility curve indicates that the solution is saturated. A saturated solution is defined as a solution in which 100 g of solute is dissolved in 100 g of water. Simulations below this line indicate unsaturated solutions.

The difference between unsaturated and saturated solutes can be determined by adding very small amounts of solute to the solution. In unsaturated solutes, solutes will dissolve, and solutes in saturated solutes will not dissolve. In saturated solutes, crystals will form very quickly around the added solute.

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A radioactive substance decreases by 65% each hour. Find the hourly decay factor. The hourly decay factor is 0.35.

Chemicals in the class of radionuclides (also known as radioactive materials) have unstable atomic nuclei. They become stable by undergoing modifications in the nucleus (spontaneous fission, alpha particle emission, neutron conversion to protons, or the opposite).

A radioactive atom will naturally emit radiation in the form of energy or particles in order to transition into a more stable state. The difference between radioactive material and the radiation it emits must be made.

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Answer:

1.53 cm/s

Explanation:

Rate = Length/time

        = 23/15

        = 1.53 cm/s

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