what mass of sodium benzoate should you add to 150.0 ml of a 0.15 m benzoic acid solution to obtain a buffer with a ph of 4.25?

The right choice is Si-C. Carbon has a stronger ability to draw electrons to itself because of its higher electronegativity.

The smallest elemental component of the an atom, the electron seems to have a negatively charged. In a neutral atom, there is an equal number of both electrons and protons. 1 electron and 1 proton are all that the hydrogen atom has. In contrast way, the uranium atom contains 92 protons, which means 92 electrons.

The strongest evidence we currently have is that neutrons and protons contain particles. These subatomic particles are known as quarks. The strongest evidence we have also demonstrates that an electron is completely empty inside.

To know more about electron visit :

https://brainly.com/question/18367541

#SPJ4

The Earth's surface is covered with an electron. To maintain the electron immobile, an electric field must always be applied downward.

A negative charge subatomic particle known as an electron can either be free or attached to an atom. One of the three main types nuclear particles within an atom is an ion that is bonded to it; some other two are neutrons and protons.

For dispassionately charged species, the concentration of electrons within an atom is similar to the atomic weight of an element. This indicates that an element has an equal amount of both protons and electrons. Consequently, oxygen contains 8 electrons.

To know more about electrons visit:

https://brainly.com/question/18367541

#SPJ4

Starting with one molecule of isocitrate and ending with fumarate the maximum number of ATP molecules that could be made through substrate-level phosphorylation is one

Cells primarily employ adenosine triphosphate, or ATP, as their source of energy. It can be broken down to liberate the energy held in its phosphate bonds, which have a lot of energy. In the first stage of the citric acid cycle, isocitrate is changed into alpha-ketoglutarate, which causes substrate-level phosphorylation to produce one molecule of NADH.

The remaining phases of the citric acid cycle use the NADH and FADH2 created during the cycle to make ATP through the electron transport chain rather than substrate-level phosphorylation. Therefore, one isocitrate molecule can only be converted into one ATP molecule through substrate-level phosphorylation.

Read more about ATP on:

https://brainly.com/question/14796956

#SPJ4

The mass of water in the container that contains a block of granite of mass 660g is 132.53g.

Calorimetry is the science of measuring the heat absorbed or evolved during the course of a chemical reaction or change of state.

The mass of the granite in this question can be calculated using the following formula;

Q = mc∆T

Where;

mc∆T (water) = - (mc∆T) {granite}

m × 4.184 × {88 - 25} = - {660 × 0.79 × (88 - 155)

263.592m = 34,933.8

m = 132.53g

Therefore, 132.53g is the mass of the water in the container.

Learn more about calorimetry at: https://brainly.com/question/11477213

#SPJ1

Answer:

a. chemical

Explanation:

Chemical energy is energy stored in the bonds of atoms and molecules.

9 moles of CO2 would require 9 moles of C3H8 since the ratio of C3H8 to CO2 is 1:3. This is because the balanced chemical equation for the reaction is C3H8 + 5O2 --> 3CO2 + 4H2O. This equation shows that for every 1 mole of C3H8, there will be 3 moles of CO2 produced.

Furthermore, the stoichiometric coefficients of the reactants and products indicate the relative amounts of each reactant and product in the reaction. Hence, reaction stoichiometry can be used to calculate the amount of each reactant or product needed to produce a desired amount of product.

This is especially useful in determining the amount of a reactant needed to produce a certain amount of product. In this case, the stoichiometry of the equation indicates that 9 moles of C3H8 would be needed to produce 9 moles of CO2.

To know more about  balanced chemical equations refer to the link brainly.com/question/28294176

#SPJ4

The equivalence point of the titration would occur when all three protons have been neutralized and the pH of the solution becomes neutral (around 7).

Titration curves provide graphical depictions of titration analyses. Scientists first measure a property of the analyte solution (usually pH for acid-base titrations). Then, they plot this property against the volume of the titrant added.

Phosphoric acid (H3PO4) is a triprotic acid, which means it can donate three protons (H+) with different acid dissociation constants (pKa) values. The pKa values for phosphoric acid are 2.12, 7.21, and 12.67.

In the first region, the initial pH of the phosphoric acid solution is 1.0, which corresponds to the first proton dissociation (pKa = 2.12). As NaOH is added, the pH of the solution increases rapidly as the first proton is neutralized.

In the second region, the pH of the solution increases more slowly as the second proton (pKa = 7.21) is neutralized.

In the third region, the pH of the solution increases even more slowly as the third proton (pKa = 12.67) is neutralized.

The equivalence point of the titration would occur when all three protons have been neutralized and the pH of the solution becomes neutral (around 7).

To know more about titration curve, visit:

brainly.com/question/29590776

#SPJ4

Carvone boils at 227 °C when its vapour pressure reaches 760 mmHg, which is normal pressure

Vapour pressure rises with temperature and is a measurement of a substance's propensity to transform into a gaseous or vapour state. The boiling point of a liquid is the temperature at which the pressure exerted by its surroundings equals the vapour pressure present at the liquid's surface.

An indicator of a chemical's volatility is vapour pressure. Authorities and professionals frequently use it to forecast airborne chemical concentrations, occupational exposure, and environmental releases to the atmosphere. Data on vapour pressure is also necessary as a prerequisite for studies involving animals and the environment.

To know more about vapour pressure visit:

https://brainly.com/question/25699778

#SPJ4

.

Red propolis is a complex bee product. It is a resin produced by Apis mellifera bees and studies show that they have various beneficial properties.

The extraction of compounds can be done using water or ethanol. The components extracted depend upon the solvent used. Red propolis has characteristic phenolic compounds. They seem to have a wide range of activity from antibacterial to antifungal to antioxidant properties. The most activity was shown in extracts using aqueous solutions of ionic liquids or eutectic solvents.

The main compounds found in Red propolis are daidzein, formononetin, biochanin, medicarpin, neoflavanoids, chalcones, and flavonols, the characteristic red color of the product is due to pigments called retusapurpurins. Extracts having a high content of flavonoids shows high antioxidant activity.  Extracts seem to have effects on commonly encountered cocci and Gram-positive rods, such as human tubercle bacillus, but only limited activity against Gram-negative bacilli.

So Brazilian red propolis seems to affect Gram-positive rods and commonly seen cocci.

For further details about natural antibacterial agents, kindly refer

https://brainly.com/question/28188181

#SPJ4

Silver nitrate has a heat of hydration of -797.4 kJ/mol.

The heat produced when water reacts with cement powder in contact is known as the heat of hydration. The cement composition, curing temperature, water to cement ratio, and cement fineness all affect how much heat is released. The amount of energy generated during the hydration process of one mole of ions is known as the heat of hydration. It is a particular kind of dissolution energy, and water is the solvent. The heat of hydration is a crucial component of mass concrete (ACI 207.1R). In order to reduce cracking, measures must be taken to deal with the heat generated during the hydration of the cement and the resulting volume change. Mass concrete is any volume of concrete with dimensions large enough to necessitate such measures.

Here,

In the case of silver nitrate, the heat of hydration is -797.4 kJ/mol.

To know more about heat of hydration,

https://brainly.com/question/21235543

#SPJ4

One dose of milk of magnesia needs to be neutralized with 0.35 L of HCl at a pH of 1.3

From the pH, we may calculate the hydrogen ion concentration as follows;

pH equals -log[H+]

Antilog: [H+] (-pH)

Antilog = [H+] (-1.3)

[H^+] = 0.0398 M

The reaction equation is now;

Milk of Magnesia with 2HCl leads to MgCl2 plus 2H2O.

Mg[tex](OH_{2} )[/tex]  reaction mass is 4.00102mg or 0.4 g.

Mg[tex](OH_{2} )[/tex] moles are equal to 0.4 g/58 g/mol, or 0.00689 moles.

If two moles of HCl and one mole of Milk of Magnesia react, Mg[tex](OH_{2} )[/tex]  interacts with 0.00689 moles of 0.00689 moles of 2 moles/1 mole.

equals 0.0138 moles of HCl

Observe that

Number of moles = volume concentration

Volume equals moles times concentration

Volume is 0.0138 moles per 0.0398 M.

Amount = 0.35 L

Learn more about Milk of Magnesia

brainly.com/question/22066653

#SPJ4

0.12g Cu

The rate of flow of charge, measured in amperes, can be represented as coulombs per second.

4.0 minutes x 4.0 min x (60 s / 1 min) x (1.5 coulomb / 1s) x (1 mol e- / 96485 coulomb) x (1 mol Cu / 2 mol e-) x (63.55g Cu / 1 mol Cu)  equals 0.1186g Cu.

Approximately 0.12g Cu.

Apply the unit-factor approach as known as dimensional analysis. You can reach the solution with a one-line setup and a series of computations.

To learn more about charge, click here: -

https://brainly.com/question/18403197

#SPJ4

The number of lead ions in 1 kg of water at 15 ppb on a weight basis is found to be 4.3623 x 10^16.

The amount of units of mass of a contaminant per million units of total mass is known as parts per million (ppm).

Learn more about lead here:

brainly.com/question/1782326

#SPJ4

The relationship between the two molecules is as shown in the diagram attached which are diasetreomers.

Optical isomers are the stereoisomers that are non superimposable mirror images of each other and differ in the direction with which they rotate plane-polarised light. They are said to be “chiral” (handed) and referred to as enantiomers or enantiomorphs of each other.

An object or a system is chiral if it differs from its mirror image, and its mirror image can not be superimposed on the original object. A molecule can be chiral only if it lacks an improper axis of rotation- that is, a rotation-reflection axis (Sn).

However, molecule can also be considered as chiral if it doesn’t possess a center or plane of symmetry. The later criterion must be applied carefully, because some molecule may lack both center and plane of symmetry but still have superimposable mirror image, means compound is achiral.

Hence, the correct option is B.

To know more about diastereomers here

https://brainly.com/question/13265194

#SPJ4

As her drink got warmer, she noticed that there were fewer bubbles in it because as temperature increases, pressure also increases and vice versa.

Using a derivative of the combined gas law we can explain that is happening in both the cases.

Assuming that volume is constant which is predicated on the bottle shape and structure, pressure of a given mass of gas varies directly with  absolute temperature.

As temperature increases, pressure also increases and vice versa. The bottle at a higher temperature has a higher pressure of gas and the bottle at lesser temperature has a reduced pressure inside.

To know more about combined gas law, refer

https://brainly.com/question/13154969

#SPJ4

The significance of carbon bonding in biological molecules because it enables the synthesis of a variety of chemical compounds that are necessary for the survival and proper functioning of all living things.

Because it is the foundation for the structural and functional variety of biological molecules, carbon bonding plays a crucial role in these molecules. Carbon is a remarkable element that may be used to make a diverse range of chemical compounds because it can form stable covalent bonds with so many different elements, including other carbon atoms, hydrogen, oxygen, nitrogen, sulphur, and phosphorus. Carbon-based compounds make up the majority of biological molecules, including proteins, lipids, nucleic acids, and carbohydrates. These molecules are important for all living organisms to function and live.

Carbohydrates like sugars and starches are the primary energy source for all living things. Their structure is composed of covalently bonded simple carbohydrates like glucose and fructose. Fats and oils are lipids that are essential for the development of cell membranes as well as energy storage and insulation. Covalent bonds hold the fatty acids that make up their structure together. Nucleic acids like DNA and RNA make up the genetic material found in all living organisms. They are composed of nucleotides, which are connected by covalent bonds and are in charge of storing and transmitting genetic information. Proteins are essential for structure, regulation, and catalytic reactions in living things. The amino acids that makeup them are joined together by peptide bonds in their construction. 

To know more about carbon bonding, click the below link

https://brainly.com/question/12156863

#SPJ4

368 g of hydrogen gas is produced. calculate the number of moles of hydrogen gas produced.

It is found in the sun and most of the stars, and the planet Jupiter is composed mostly of hydrogen. On Earth, hydrogen is found in the greatest quantities as water. It is present as a gas in the atmosphere only in tiny amounts – less than 1 part per million by volume.

Hydrogen can be used in fuel cells to generate electricity, or power and heat. Today, hydrogen is most commonly used in petroleum refining and fertilizer production, while transportation and utilities are emerging markets.

To know more about hydrogen visit

https://brainly.com/question/28937951

#SPJ4

The experimental yield of carbon dioxide would be 85% of the amount of calcium carbonate that reacted.

Carbon dioxide (CO2) is a naturally occurring gas composed of one carbon atom and two oxygen atoms. It is the most significant of the greenhouse gases, responsible for about 63% of the total global warming effect. Carbon dioxide is produced by the burning of fossil fuels, through respiration, and is also released during land-use changes such as deforestation. Carbon dioxide is essential to life on earth, as it is a major component of photosynthesis, which helps plants to grow. In the atmosphere, carbon dioxide acts as a blanket that traps infrared radiation, causing the global temperature to rise.

To learn more about carbon dioxide
https://brainly.com/question/25385913
#SPJ4

If you were to measure out 0.0237 moles of potassium nitrate into a clear, dry cup. 2.4 grams are in this sample. Molar mass of KNO₃ is 101.11g/mol.

The term molar mass is defined as the mass in grams of one mole of the compound.

Molar mass of KNO₃ = 39.10 + 14.01 + 16 (3)

= 101.11g/mol

Mass (m) = ?

Molar mass (M) = 101.11g/mol

Number of moles (N) = 0.0237 moles

n = m / M

m =  0.0237 × 101.11

= 2.4 grams

Thus, If you were to measure out 0.0237 moles of potassium nitrate into a clear, dry cup. 2.4 grams are in this sample. Molar mass of KNO₃ is 101.11g/mol.

To learn more about the molar mass, follow the link;

https://brainly.com/question/12127540

#SPJ1

The following physical properties of the unknown substance are described in the scenario: Color: green-blue, State: solid, Malleability: not malleable, Melting point: 24.3 oC, Density: 5.621 g/m3 and Flammability: flammable.

Therefore, six physical properties are described in the scenario.

Properties that can be defined without altering the arrangement of a substance are known as physical properties. Features such as melting point, boiling point, density, colour,  solubility, odor, etc. are physical properties.

A chemical property is a feature of a substance that may be observed when it takes part in a chemical reaction. Examples of chemical properties include flammability, chemical stability, toxicity, and heat of combustion.

To know more about density, visit here:

https://brainly.com/question/29775886

#SPJ4

To heat a beaker of water when a gas line is not present we can use hot plate instead in the given scenario.

In the laboratory, hot plates are frequently used for a variety of tasks, including heating samples and conducting chemical reactions. The idea of a hot plate is straightforward: it is a flat surface with heating elements. They are suitable for use in oil or sand baths and do not produce open flames. When heating samples, the hot plate system with a stirrer offers greater temperature uniformity. For precise temperature heating in chemistry and biology, a laboratory hot plate is typically used. Use aluminium plates if you need to work with temperatures between 300 and 400 degrees Celsius as your maximum required working temperature.

To learn more about laboratory click here:

https://brainly.com/question/1820425

#SPJ4

The most likely charge on the ion when this atom forms an ion O⁻².

Actually any atom tries to reach its nearest noble gas electron distribution, which is 8 electrons in its last shell (2 in case of helium). To achieve the total of 8 electrons in its last shell an atom takes up or gives up electrons.

Like in case of oxygen, it has 6 electrons in its last shell, thus generally takes up 2 more electrons to achieve the electron distribution of noble gas neon(10) and it can be written as O⁻².

Now when an atom takes up electron it becomes electronegative(because of more negative charged entities in it i.e, electrons)  and when one gives up electron it becomes electropositive(because of extra positive charged entities in it i.e, proton).

But there can be some extra valencies other than the most stable one(which has the noble gas configuration). For example, oxygen has valencies of +1, +2, -1 other than -2(most stable).

Your question is incomplete most probably your full question was

From your knowledge about the distribution of electrons in their shells and from the atomic number (in parentheses), indicate the most likely charge on the ion when this atom forms an ion. (Remember the 2-8-18 shell distribution.) Oxygen (8) +1 +2 -2 -1

To look more about electrons click here

brainly.com/question/1255220

#SPJ4

Since the molar mass of water is 18.02 grams, then the amount of water that can be produced is 2 × 18.02 = 36.04 grams. This means that when 168.3 grams of HNO3 is consumed, 36.04 grams of water can be produced.

The reaction equation also shows that 6 moles of HNO3 are needed to create 1 mole of water. This means that for every 6 grams of HNO3 consumed, 1 gram of water can be produced. Therefore, when 168.3 grams of HNO3 are consumed, 168.3/6 = 28.05 grams of water can be produced.  

In order to calculate the number of grams of water that can be produced from a given amount of HNO3, it is important to know the molar mass of both the reactants and the products. This is because the molar mass can be used to convert the amount of reactant into the amount of product. In the equation given above, when 168.3 grams of HNO3 are consumed, 36.04

To know more about molar mass refer to the  link  brainly.com/question/12127540

#SPJ4

The work for the gas expansion from a sample of an ideal gas at 15.0 atm and 10.0 L that is allowed to expand against constant external pressure of 2.00 atm at a constant temperature is calculated as 13.2 kJ.

Boyle's law is an experimental gas law that describes relationship between pressure and volume of a confined gas.

Given, Initial pressure = 15.0 atm ; Initial volume = 10.0 L and Final external pressure = 2.00 atm

Using the equation for Boyle's Law ; P₁V₁ = P₂V₂

(15.0 atm × 10.0 L) = (2.00 atm × V₂)

V₂ = (15 * 10)/2

So, V₂ = 75.0 L

change in the volume, ΔV = V₂ - V₁

ΔV = 75.0 L - 10.0 L

So, ΔV = 65.0 L

As, W = -PΔV

P , external pressure = 2.00 atm

W = -(2.00 atm × 65.0 L)

So, W = -130 L. atm

W= -130 * (101.3/1)

W = 13169 J

Hence, W = 13.2 kJ

Therefore, work for the gas expansion is 13.2 kJ

To know more about Boyle's Law, refer

https://brainly.com/question/1696010

#SPJ4

Note: The question given on the portal is incomplete. Here is the complete question.

Question : sample of an ideal gas at 15.0 atm and 10.0 l is allowed to expand against a constant external pressure of 2.00 atm at a constant temperature. calculate the work in units of kj for the gas expansion.

Every restaurant kitchen has a hood suppression system that, when smoke is detected, releases wet chemicals over the fire's source.

Wet chem is a type of analytical methods that examines materials using traditional techniques like observation. Wet chemistry is the term used to describe the majority of analysis, which takes place in the liquid phase. Because many tests are carried out at lab benches, wet chemistry is sometimes known as bench chemistry.

Chemical wet The extinguishing agent may consist of water in solutions with potassium dichromate, potassium carbonate, potassium lactate, or a combination of these compounds, but this is not a requirement (which are conductors of electricity). The pH of the liquid agent is normally 9.0.

To know more about Wet chemicals visit :
https://brainly.com/question/28260537

#SPJ4

Number of valence electrons determine how fast/easy for an atom to gain stability. Either by gaining electrons or losing electrons. Group 1 & 7 elements react fast because they only have 1 electron to gain or lose.

A chemical substance is a species of atoms, such as the pure substance made entirely of that species, with a specific amount of protons in their nuclei. Chemical elements, in contrast to compounds, cannot be converted either by chemical reaction into simpler substances.

The first twenty elements include metals such as lithium, beryllium, sodium, potassium, magnesium, aluminum, and calcium. The non-metals in the first twenty are hydrogen, helium, carbon, nitrogen, oxygen, fluorine, neon, phosphorus, sulphur, chlorine, and argon.

To know more about elements visit :

https://brainly.com/question/14347616

#SPJ4

100 gram of cobalt and chloride in 250 gram of water to make solution  that its density 1.25g/ml then the molarity of the solution will be 2.42m and 2.16 M.

Determine some important information:

Solute = CoCl₃ (molar mass = 165.29 g/m); mass of 100 g

Solvent = Water, mass of 250 g

Solution of mass = mass of CoCl₃ + mass of water

250 gram + 100 gram = 350 gram of solution

If we want to reach a molarity (mol/L), let's determine solution volume with its density:

Solution of density = solution mass / volume of solution

1.25 g/mL = 350 g / volume of solution

Volume of solution = 350 g / 1.25 g/mL = 280 mL

Let's convert the volume into Liter → 280 mL = 0.280L

Let's convert the mass of a solute into moles = 100 g / 165.29 g/m →0.605 mol

Mol/L = 0.605 mol / 0.280 L = 2.16 M

Now let's to calculate the molalilty (mol/kg of solvet)

We must to convert mass of a solvent into kg → 250g = 0.250 kg

Then, 0.605 mol / 0.250 kg =2.42 m

To know more about molality here

https://brainly.com/question/26921570

#SPJ4

Answer:

Covalent bonding between oxygen and hydrogen within water molecules.

Steel is an interstitial alloy made from Carbon and iron atoms. It is usually composed of 98-99% Iron and 1-2% Carbon. The possible answer here will be option B.

As we said Steel is an interstitial alloy, not a substitutional. So option D is not possible. The iron atoms are larger in size, so depicting both Iron and Carbon as equal size is not correct. Thus option c cannot be the structure. Also in the case of option A, if we examine it, the percentage amount and size of the atom will be problematic. This gives us the only possible answer B.

As we said steel is an interstitial alloy, which in a particle level structure will show 12 large iron atoms, arranged in a 3 by 4 array and carbon atoms are present in the intersection of four Iron atoms. Small carbon atoms will be seen throughout the lattice.

So the answer will be option B.

For further information regarding Particle structure of alloys, kindly refer

https://brainly.com/question/25263017

#SPJ4        

When 1-propanol is heated in the presence of an acid, the reaction produces two products: 1-propene and water.

This reaction is known as an ether cleavage, and it is commonly used in the production of propene and other hydrocarbons.

It is an exothermic reaction, meaning that the heat generated from the reaction increases the rate of the reaction.

The other product of this reaction is water, which is produced when hydrogen from the 1-propanol molecule is removed and replaced with a hydroxyl group.

This reaction is an example of an acid-catalyzed dehydration, where an alcohol molecule is converted into an alkene molecule by the removal of the OH group and the addition of a hydrogen atom from the acid. The overall reaction is: C3H7OH + H2O → C3H6 + H3O+.

To learn more about water, click here;

https://brainly.com/question/28465561

#SPJ4