Weigh out the appropriate amount of HEPES sodium salt required to prepare 100 mL of a HEPES buffer that has pH 7.50 and is 90 mM in HEPES. FW for the HEPES sodium salt is 260.31. Transfer to a 150 mL beaker. Flowchart: Calculate the amount of HEPES sodium salt required to make the buffer.

Nuclear Fission

Nuclear fission, subdivision of a heavy atomic nucleus, such as that of uranium or plutonium, into two fragments of roughly equal mass. The process is accompanied by the release of a large amount of energy. In nuclear fission the nucleus of an atom breaks up into two lighter nuclei.

Nuclear fission is a process where the nucleus of an atom is split into two or more smaller nuclei, known as fission products. The fission of heavy elements is an exothermic reaction, and huge amounts of energy are released in the process.

answer:

a compass needle points north toward earths magnetic pole.

Explanation:

because of the earths magnetic field.

a compass needle points north toward earths magnetic pole is an example of the electromagnetic force.

An electromagnetic force is one of the four fundamental forces a combination of both electrical and magnetic forces and this force is act up on the charged particles .

It  is inversely proportional to the inverse square of the distance between particles, electromagnetic force can be attractive or repulsive shows infinite range and this force holds atoms together in molecules.

This force can be produced by electromagnetic fields, electrostatic field, and magnetostatic field which affects all of the universal objects due to its infinite range.

This force causes electric and magnetic effects like repulsion between like electrical charges or the interaction of bar magnets, it is weaker than the strong force.

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Most chemical reactions involve the breaking and formation of chemical bonds. It takes energy to break a chemical bond but energy is released when chemical bonds are formed. If more energy is released than consumed, then the chemical reaction evolves heat and is said to be exothermic.

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Answer:

Most chemical reactions involve the breaking and formation of chemical bonds. It takes energy to break a chemical bond but energy is released when chemical bonds are formed. If more energy is released than consumed, then the chemical reaction evolves heat and it called exothermic.

Answer:

\(T_S=-1.09\°C\)

Explanation:

Hello!

In this case, since the freezing point depression for a solution is computed via:

\((T_S-T_W)=-imK_f\)

Whereas TW is the freezing temperature of water, TS that of the solution, i the van't Hoff's factor (3 for K2S as it ionizes properly), m the molality of the solution and Kf the freezing point constant of water. Thus, we plug in to obtain:

\((T_S-0\°C)=-3*0.195m*1.86\frac{\°C}{m}\\\\T_S=-1.09\°C\)

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The correct answer is -1.088. (Don't forget the negative sign).

Positively charged ions move from a salt bridge to the anode compartment in a galvanic cell, whereas negatively charged ions move from a salt bridge to a cathode compartment.

Galvanic or voltaic cells are two types of electrochemical devices that use chemical energy from spontaneous redox reactions to produce electricity. Convectional cell An electrochemical device known as a voltaic cell uses chemical reactions to produce electricity.

The electrical energy generated by the transfer of electrons during a redox reaction is used by galvanic cells to carry out practical electrical operations. Separating the oxidation / reduction half-reactions and connecting them with a wire makes it possible to collect the electron flow since the electrons must pass through the wire in order to move between the two half-reactions.

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Answer:

A water molecule displays polarity by having negative and positive ends. Due to this charge difference, a water molecule is called a dipole.

Explanation:

The latent heat of fusion for a food product with 68% moisture content could be between 70-150 Joules per gram (J/g).

The latent heat of fusion is a crucial factor that determines the energy required to melt a food product. The percentage of moisture content present in a food product is a key variable that can significantly affect its latent heat of fusion. However, the latent heat of fusion for such food products is not set in stone and can vary depending on several other factors as well.

The type of food product, its composition, and melting point are some of the other key aspects that can influence a food product's latent heat of fusion. Different food products may have different latent heats depending on their composition and melting point. For instance, products with high-fat content may require more energy to melt than products with low-fat content. Similarly, if a food product has a low melting point, it may require less energy to melt.

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Answer:

15 cents where im from

Explanation:

To convert to Celsius, we subtract 273.15 from the Kelvin temperature, giving us a final answer of 42.1°C.

Temperature is a physical quantity that measures the average kinetic energy of the particles in a system. It is an important parameter for understanding the behavior of matter and the underlying physical processes at work. Temperature is measured in units such as degrees Celsius (°C), Fahrenheit (°F), Kelvin (K), or Rankine (°R). Temperature affects the rate at which chemical reactions occur and the movement of particles in solids, liquids, and gases.

The ideal gas law states that PV = nRT,
where n is the number of moles,
P is the pressure,
V is the volume, R is the ideal gas constant (8.314 J/molK), and
T is the temperature in Kelvin.
Rearranging the equation, we get T = (PV)/(nR).
Plugging in our values, we get T = (89.9 atm * 4191 mL)/(2.6 mol * 8.314 J/molK) = 115.2 K.
To convert to Celsius, we subtract 273.15 from the Kelvin temperature, giving us a final answer of 42.1°C.

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The pH of a 0.00150 M HNO3 solution is 2.82

Answer:

a mole is the number of molecules in 22.4 dm³ for all gases at all temperatures and pressures

Any object which have less density than the mercury will float in it and which have higher density will sink on it. Here, gold has higher density than  mercury. Thus it will sink on mercury.

Density of a substance is the measure of its mass per volume. Thus it says about how much denser the substance is in a specific volume. The ratio of density of an object to the density of  water is called specific gravity.

The density of mercury is 13.4 g/ml. Any object which is less dense than mercury will float on its surface whereas, objects which have higher density than mercury will sink on it.

The density of gold is 79.3 g/ml. All other given metals iron, lead and copper have a density less than that of mercury. Hence the substance which sink on mercury is gold. Option Dis correct.

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Answer:

It appears that the diagram you provided represents the chemical compound chlorine monofluoride (CI-F). The arrow below the compound may be intended to indicate the movement or flow of electrons in the compound.

Chlorine monofluoride is a highly reactive and toxic compound that is used as a powerful oxidizing agent. It is a compound of chlorine and fluorine, with the chemical formula ClF. It is a yellowish gas at room temperature and has a strong, pungent smell. Chlorine monofluoride is highly reactive and can ignite or explode upon contact with many materials, including water. It is used in a variety of industrial processes, such as the production of semiconductors and the purification of aluminum. However, it can also be harmful to human health if inhaled or ingested, and it should be handled with caution.

Explanation:

This is due to the fact that a substance's chemical qualities, such as its molecular form, polarity, and functional groups, govern how it behaves and interacts with other substances.

By illustrating the spatial arrangement of atoms and chemical bonds within the molecule, chemical structure establishes the molecular geometry of a compound. In doing so, chemists are given a crucial visual depiction of a chemical formula.

In a chemical reaction, reactants come into contact with one another, atoms in the reactants break their connections with one another, and then the atoms reorganise and form new bonds to create the products.

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Answer:

0.476 L

Explanation:

To find the volume of the blood, you need to multiply the given mass (grams) by the density of blood. It is important to arrange the ratio in a way that allows for the cancellation of units (since you are going from grams to mL, grams must be in the denominator).

Density = 1.05 g/mL

 500 grams                1 mL
--------------------  x  ---------------------  =  476 mL
                               1.05 grams

Finally, you need to convert mL to L. The final answer should have 3 sig figs like the given mass.

1,000 mL = 1 L

   476 mL                    1 L
-----------------  x  --------------------  =  0.476 L
                              1,000 mL

The pH of the solution is approximately 9.13.

The mixture is a buffer solution because it comprises acetic acid, a weak acid, and the conjugate base, acetate ion. The pH of the buffer solution can be determined using the Henderson-Hasselbalch equation:

\(pH = pKa + log([A^-]/[HA])\)

where [A-] is the concentration of the acetate ion (measured by the dissociation of sodium acetate), [HA] is the concentration of acetic acid, and [pKa] is the acid dissociation constant of acetic acid (1.75 x 10^-5).

The concentration of the acetate ion ([A-]) in the solution must first be determined. The concentration of sodium acetate can be estimated as follows since 2.05 g of sodium acetate dissolve in 92.00 mL of solution:

molar mass of \(NaCH_3COO\) = 82.03 g/mol

moles of \(NaCH_3COO\) = 2.05 g / 82.03 g/mol = 0.0250 mol

concentration of \(NaCH_3COO\) = 0.0250 mol / 0.09200 L = 0.271 mol/L

Due to the complete dissociation of sodium acetate in water, the acetate ion concentration is also 0.271 mol/L.

The amount of acetic acid ([HA]) in the solution must then be determined. Since acetic acid has an initial concentration of 0.25 M, part of it will interact with the acetate ion to produce more sodium acetate. The following illustrates the reaction:

\(CH_3COOH(aq) + CH_3COO^-(aq) = CH_3COO^-Na^+(aq) + H_2O(l)\)

The equilibrium constant for this reaction is:

\(Ka = [CH_3COO^-Na^+][H_2O] / [CH_3COOH(aq)][CH_3COO^-(aq)]\)

Since water is a solvent, its concentration remains essentially constant, and we can write:

\(Ka = [CH_3COO^-Na^+] / [CH_3COOH(aq)][CH_3COO^-(aq)]\)

Solving for [\(CH_3COOH\)(aq)], we get:

\([CH_3COOH(aq)] = [CH_3COO^-Na^+] / (Ka[CH_3COO^-(aq)])\)

\([CH_3COOH(aq)] = (0.271 mol/L) / (1.75 * 10^{-5})(0.271 mol/L)\)

\([CH_3COOH(aq)] = 15.5 *10^{-3} mol/L\)

Substituting these values into the Henderson-Hasselbalch equation, we get:

\(pH = pKa + log([A^-]/[HA])\)

\(pH = -log(1.75 * 10^{-5}) + log(0.271 mol/L / 15.5 * 10^{-3} mol/L)\)

pH = 9.13

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CaO and H2O mix to form Ca(OH)2, a single chemical. It is a combination reaction as a result.

When two or more elements or compounds combine to create a single product, the reaction is known as a direct combination reaction. Equations of the type X + Y. XY are used to depict these reactions.

A combination reaction occurs when two or more components combine to produce a single compound.

Combination reactions occur when two or more reactants come together to create a new product. Synthesis reaction is another name for combination reaction. For instance, hydrogen and chlorine can mix to form hydro-chloride.

Thus, CaO + H2O →Ca(OH)2 this reaction is combination reaction.

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Answer:

You know that's the answer of the question am searching

The net ionic equation is applied mainly in neutralization reactions, displacement reactions and redox reactions. The net ionic equation is as follows

Cl⁻+Ag⁺\(\rightarrow\)AgCl

The net ionic equation represents a chemical equation of a reaction that give an idea of species that are really participating in the reaction. We can write net ionic equations for those electrolyte which are strong in water.

The balanced net ionic equation for the reaction of Cl and AgNO\(_3\) is

 Cl⁻+ AgNO₃\(\rightarrow\)AgCl +NO₃⁻

 Cl⁻+Ag⁺+NO₃⁻\(\rightarrow\)AgCl +NO₃⁻

Cl⁻+Ag⁺\(\rightarrow\)AgCl

The net ionic equation cancels out ions that appear on both sides of the reaction arrow because they essentially don't participate in the reaction of interest.

Therefore, the net ionic equation  for the reaction of Cl and AgNO\(_3\) is

Cl⁻+Ag⁺\(\rightarrow\)AgCl

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Answer:

Cautiously and avoiding filling in the central area so that it does not overflow when filling, since being very beach makes filling difficult.

Explanation:

The basins are shallow, that is why filling is difficult, the filling must be slow, low intensity and at the edges not placing the water filling in the center of the basin.

When you fill a basin with liquid water, you can see that the water takes the shape of the container in which it is contained. This is because in the liquid state, water has molecules farther apart than in the solid state.

You can notice this property when performing an experiment with liquid and solid water.

When filling a glass, liquid water takes on the shape of a glass, and solid water, such as an ice cube, remains the same shape when placed in a glass.

Therefore, when filling a basin with water we perceive a property of the physical state of water, in liquid form. Water is one of the few substances that can be found naturally in liquid, solid and gaseous states.

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Answer:

1. iodide ion into neutral iodine

2. blue-black

3. neutral iodine into iodide ion

4. clear

Explanation:

The function of hypochlorite in iodine titration is to oxidize the iodide ion into iodine molecule as shown below;

ClO-(aq) + 2H+(aq) + 2I-(aq) ---------> 6 I2(l) + Cl- (aq)+ H2O(l)

The addition of starch to iodine leads to the formation of a starch iodide complex which has a blue black colour.

the titrant, thiosulfate, reduces neutral iodine into iodide ion as shown below;

I2  +  2S2O32-  → 2I- + S4O62-

At end point, the solution becomes clear again.

Option b is the correct answer. Nucleic acid is a type of biochemical is shown in this illustration.

The representation gave is an improved on variant of the design of a nucleotide, which is a structure block of nucleic acids like DNA and RNA. The nucleotide comprises of three parts: a sugar particle (displayed in the representation as CH2OH), a nitrogenous base (not displayed in this delineation), and a phosphate bunch (displayed in the representation as - O-P=O). The phosphate bunch is adversely charged and can shape hydrogen bonds with different nucleotides to make the foundation of the nucleic corrosive strand. The plan of nucleotides and the arrangement of the nitrogenous bases decide the hereditary code and capability of the nucleic corrosive.

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If an equation includes 7(CrO₄)₂, the numbers of Cr's and O's atoms that are there are 14 and 56 respectively.

The number of atoms present in a chemical compound can be calculated by multiplying the subscript of the particular element by any coefficient.

According to this question, 7 moles of chromate with the chemical formula; (CrO₄)₂ is given. The number of oxygen and chromium atoms in this compound can be calculated as follows:

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Answer: Protons cannot change in an atom because that would change the identity of a particle. Electrons on the other hand can be added or removed creating an ion. Neutrons can also be added or removed to create an isotope.

Answer:

The molar mass is 138.8843 g/mol 

Answer:

C. 4%

Explanation:

The answer is 4%

The resulting pH of the solution is 1.74(approx).

To solve this problem, we need to use the concept of acid-base equilibrium and the pH scale. The addition of sulfuric acid will increase the concentration of H+ ions in the solution, which will shift the equilibrium of the \(H_2S\)/HS- system. We can use the following equation to calculate the pH of the resulting solution:

Ka = [H+][HS-]/\(H_2S\)]

where Ka is the acid dissociation constant for \(H_2S\), [\(H_2S\)], [HS-], and [H+] are the concentrations of the \(H_2S\), HS-, and H+ ions, respectively.

First, we need to calculate the initial concentrations of\(H_2S\) and HS- in the solution:

[\(H_2S\)] = 0.505 M

[HS-] = 0.505 M

Next, we need to calculate the amount of H+ ions added to the solution by 1 mL of concentrated sulfuric acid. To do this, we can use the following equation:

[H+] = (n/V) = (18.4 mol/L) x (1x\(10^{-3}\) L) = 1.84 x\(10^{-2}\)mol

where n is the amount of sulfuric acid added in moles, V is the volume of the solution in liters, and 18.4 mol/L is the concentration of the sulfuric acid.

Now, we can calculate the new concentrations of \(H_2S\), HS-, and H+ ions in the solution:

[\(H_2S\)] = [\(H_2S\)]0 - [H+] = 0.505 - 1.84x\(10^{-2}\)= 0.486 M

[HS-] = [HS-]0 + [H+] = 0.505 + 1.84x\(10^{-2}\) = 0.524 M

[H+] = 1.84 x \(10^{-2}\)M

Finally, we can use the equation for Ka to calculate the pH of the resulting solution:

Ka = 1.1 x \(10^{-7}\)

[H+] x [HS-]/[\(H_2S\)] = Ka

pH = -log[H+]

Substituting the values, we get:

(1.84 x \(10^{-2}\)) x (0.524)/(0.486) = 1.98 x \(10^{-2}\)

pH = -log(1.98 x \(10^{-2}\)) = 1.74(approx)

Therefore, the resulting pH of the solution is 1.74(approx)

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Answer:

ionic

Explanation:

the bonds that hold magnesium and oxygen together are formed between atoms that give electrons