What is the pH of a solution that is 0.040 M formic acid and 0.0032 M formate (the conjugate base)? Ka of formic acid = 1.77 x 10-4

2. Which of the following would have the highest buffer capacity?

Group of answer choices

1.500 M NH4+ / 1.500 M NH3

0.25 M HCO3- / 0.25 M CO32-

0.35 M HCOOH / 0.35M HCOO-

0.40 M HF / 0.40 M F-

1.0 M HCN / 1.0 M CN-

3. What will be the final pH when 5.865 mL of 3.412 M NaOH is added to 0.5000 L of 2.335 x 10-2 M HCl?

4. 0.450 L of 0.0500 M HCl is titrated to the equivalence point with 8.73 mL of a NaOH solution. What is the concentration (in M) of the NaOH solution that was added?

1) Assuming that only single bonds are formed by group 4A(14) elements, the shape of a central atom of group 14 is tetrahedral.

The general electronic configuration of group 14 elements is ns²np² and it is shown in box diagram in the attached image. When one electron is excited, it goes in vacant p-orbital and the p and s-orbital is half filled. It is shown in attached image.

When the another atoms are filled in the half-fiiled orbital, it forms sp³ hybridisation and its shape is tetrahedral.

Therefore, the shape of central atom of group 14 is tetrahedral.

2) Assuming that only single bonds are formed by group 4A(14) elements, the shape of a central atom of group 15 is pyramidal.

The general electronic configuration of group 15 element is  ns²np³ and its box diagram is already shown in the image. When atoms are filled, it goes in p-orbital and pair of electron acts as a lone pair. Due to this lone pair, lone pair-bond pair repulsion is occurred and the geometry of the central atom is pyramidal.

Therefore, the shape of central atom of group 15 is pyramidal.

3) Assuming that only single bonds are formed by group 4A(14) elements, the shape of a central atom of group 16 is bent.

The general electronic configuration of group 16 is ns²np⁴ and its box diagram is shown in the attached image. There are two electron pairs which acts as a lone pair and another two orbitals are filled by another atom. When they are filled, it shows lone pair-lone pair, lone pair-bond pair and bond pair-bond pair repulsion. Therefore, they are come closer to each other and forms bent shape.

Therefore, the shape of the central atom of group 16 is bent shape.

To know more about the shape and hybridisation of the central atom

https://brainly.com/question/13291133

#SPJ1

Answer:

is this exam.. are you coping..

Answer:  No, the samples are not of equal masses.

Explanation:  Mass is volume X density

A:  (2ml)*(18.4g/ml) = 36.8 g

B:  (5ml(*(35.5g/ml) = 177.5 g

Answer:

octet rule

Explanation:

The mass of CO2 produced by 26g of acetylene is 88g.

Given ,

In an oxyacetylene torch, acetylene gas (ethyne; HCCH) burns to produce carbon dioxide and water vapour.

The acetylene combustion reaction is given by,

H2O + HCCH + 5/2 O=O 2CO2

Heat of reaction for acetylene combustion = 1259kj/mol

CO2 has a molecular mass of 44g/mol.

2 moles of CO2 have a molecular mass of 88g.

On combustion, 1 mole of acetylene yields 2 moles of CO2.

Thus, 26g of acetylene produces 88g of CO2 when burned.

As a result, the mass of carbon dioxide produced by 26g of acetylene is 88g.

Learn more about acetylene here :

brainly.com/question/15346128

#SPJ4

Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

Answer:

they are located on the abbism

Of the options given, lipids are considered a macronutrient.

Macronutrients are nutrients that the body requires in large amounts to function properly and maintain health. The three primary macronutrients are carbohydrates, proteins, and fats (lipids). Lipids are a type of nutrient that includes fats, oils, and cholesterol, and they are essential for the body's energy production, insulation, and the formation of cell membranes.

Vitamins and minerals, on the other hand, are considered micronutrients, which are nutrients that the body requires in smaller amounts but are still essential for proper health and functioning. Vitamins are organic compounds that help regulate various bodily functions, while minerals are inorganic substances that are necessary for proper cellular function, enzyme activity, and other bodily processes.

Therefore, option (a) lipids is the correct answer, as it is the only macronutrient among the given options.

For more such questions on macronutrient

https://brainly.com/question/30364554

#SPJ11

Answer:

1. Warm air rises and cold air sinks.

2. Air moves from high to low pressure.

3. Cold air is denser than warm air.

4. Warm air is lighter than cold air and consequently exerts less pressure.

5. Because the Earth rotates on its axis, circulating air is deflected toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere. This deflection is called the Coriolis effect.

Answer:

The pH scale ranges from 0-14.

Explanation:

Zero is the most acidic measurement while six would be the least acidic of the acids, seven is a pure substance, neither acidic nor basic, eight is the least basic measurement while 14 is the most basic of the bases.

Answer:

They are made up of elements.

Explanation:

An atom is the smallest particle of matter that still retains the property of the element.

Two or more atoms combine to form elements or compounds. Elements are formed by two or more similar atoms, while compounds are formed by two or more different elements.

Atoms are made up of subatomic particles, protons, electrons and neutrons. Electrons are negatively charged, protons are positively charged while neutrons have no charge.

I hope this help! :)

Answer:

1. The formula for the number of moles formula is expressed as.

2. Given.

3. Number of moles formula is.

4. Number of moles = Mass of substance / Mass of one mole.

5. Number of moles = 95 / 86.94.

Answer: gravity affect the amount of both kinetic and potential energy

Explanation:

A sample of water is taken, and the amount of acid required to bring it to a pH of 4.2 is then calculated to determine the total alkalinity.

By titrating the water sample with sulfuric acid that has known pH, volume, and concentration values, it is possible to estimate the alkalinity of water. The amount of sulfuric acid required to reach the end point and the reaction's stoichiometry are used to calculate the concentration of alkalinity in water.

The concentration of acid protons [H+] is what is commonly referred to as ph. The alkalinity of a solution, on the other hand, determines how well it can neutralize acids. Ions that are alkaline incorporate acid protons into their molecules so that they are not available as a free acid that can cause the pH to decrease.

To know more about  alkalinity of this water visit:-

https://brainly.com/question/2256890

#SPJ4

Answer:

proton-27

electron-25

neutron-35

Explanation:

Answer: your anwer is B. New moon

Hope this helped!

Answer:

C.

Explanation:

hope this helps!

thank u

~sharms uwu /

Lithium react slowly with water while potassium react violently with water. potassium caught  fire while lithium does not caught fire.

Chemical reaction is defined as a procedure in which one or more compounds, known as reactants, are changed into one or more distinct substances, known as products.

It can also be defined as a process in which two or more molecules collide with the proper orientation and enough force to produce a new product.

There are mainly five types of reaction.

Thus, Lithium react slowly with water while potassium react violently with water. potassium caught  fire while lithium does not caught fire.

To learn more about  chemical reaction, refer to the link below:

https://brainly.com/question/3461108

#SPJ1

Nitrate compounds is the answer

The standard molar enthalpy of the formation of N2O5(g) at 298 K is 19.913 kJ/mol.

To write a balanced chemical equation for the standard enthalpy of formation of N₂O₅, we start with the elements nitrogen and oxygen in their standard states:

N₂(g) + 5/2 O₂(g) → N₂O₅(g)

This equation shows that one mole of N₂ reacts with 2.5 moles of O₂ to form one mole of N₂O₅.

The standard enthalpy of formation, ΔHf°, is defined as the enthalpy change for the formation of one mole of a compound from its constituent elements in their standard states, all at 1 atm pressure and a specified temperature (usually 298 K). The enthalpy change can be calculated from the standard molar internal energy of formation, ΔUf°, using the equation:

ΔHf° = ΔUf° + RT

where R is the gas constant and T is the temperature in Kelvin.

Substituting the given values, we get:

ΔHf° = 17.433 kJ/mol + (8.314 J/mol*K)(298 K) / 1000 J/kJ
ΔHf° = 17.433 kJ/mol + 2.480 kJ/mol
ΔHf° = 19.913 kJ/mol

Therefore, the standard molar enthalpy of the formation of N₂O₅(g) at 298 K is 19.913 kJ/mol.

Learn more about standard enthalpy of formation at https://brainly.com/question/30431725

#SPJ11

The first step in this calculation is to know how many liters is equal to 1 gallon, and the value is 3.785 liters, so now we have to make the following calculation:

1 gal = 3.785 Liters

30.0 gal = x Liters

x = 3.785 * 30.0

x = 114 Liters

Elements of boron are not found in nature. It is mixed with borates, kernite, ulexite, colemanite, borax, and boric acid. Boric acids are occasionally present in vulcanic spring fluids.

boron into the air, soil, and water during weathering, boron occurs naturally in the environment. In very small quantities, it may also be present in groundwater.

Through the production of glass, the burning of coal, the melting of copper, and the use of agricultural fertilizers, humans add boron to the environment. Human-added boron concentrations are lower than boron concentrations that occur naturally as a result of weathering.

Although it is unlikely that someone may be exposed to borate dust at work, it is possible to be exposed to borate through the air and drinking water. Consumer goods like laundry detergent and cosmetics might expose you to boron.

Thus Elements of boron are not found in nature. It is mixed with borates, kernite, ulexite, colemanite, borax, and boric acid. Boric acids are occasionally present in vulcanic spring fluids.

Learn more about Boron, refer to the link:

https://brainly.com/question/31235857

#SPJ1

Answer:

Peptide bonds form between the amino group of the amino acid attached to the A-site tRNA and the carboxyl group of the amino acid attached to the P-site tRNA. The formation of each peptide bond is catalyzed by peptidyl transferase, an RNA-based enzyme that is integrated into the 50S ribosomal subunit.

When you use a soap or detergent to wash, the surfactant molecules will interact with the dirt and oils to help wash them away. During this interaction, something called a micelle is formed.

A micelle is a cluster of surfactant molecules that are formed when soap or detergent molecules are mixed with water. When soap or detergent is added to water, the hydrophobic tails of the molecules (which do not mix with water) cluster together, while the hydrophilic heads (which are attracted to water) point outwards towards the water.

Micelles are formed by the hydrophobic tails of the surfactant molecules clustering together in the center, with the hydrophilic heads facing outward.

The soap or detergent's molecules' hydrophobic tails attract oils and dirt, while the hydrophilic heads attract water molecules. The hydrophobic tails of the detergent molecules encircle the dirt and oil particles, while the hydrophilic heads point outward toward the water, creating a micelle.

The micelles disperse the dirt and oil particles throughout the water so that they can be washed away.

To learn more about detergent, refer below:

https://brainly.com/question/241514

#SPJ11

The mass of air in the scuba tank is 841.614 g.

Using the ideal gas equation;

PV=nRT

P = pressure of the gas = 195 kPa

V = volume of the gas =  350 L

n = Number of moles of the gas = ??

R = molar gas constant = R = 8.314 J K-1 mol-1

T = temperature of the gas =  10 °C or 283 K

n = PV/RT

n = 195 * 350/8.314 * 283

n = 68250/2352.862

n = 29.00 moles

Number of moles = mass/molar mass

mass of air = Number of moles * molar mass

mass of air = 29.00 moles * 29g/mol

Mass of air = 841.614 g

Learn more: https://brainly.com/question/4147359

The molecule or compound that exhibits dipole-dipole forces as its strongest intermolecular force is SO₂.

the correct option is A.

Intermolecular forces are forces that exist between molecules of the same compound and which are responsible for several physical properties of substances such as boiling and melting points.

Some of the intermolecular forces that exist between molecules of compounds include:

The strongest intermolecular force is the ion-dipole force.

Considering the intermolecular forces present in the given compounds:

SO₂ - has  London dispersion forces and dipole-dipole forces

Cl₄ - has London dispersion forces

BCl₃ - has London dispersion forces

Br₂ -  - has London dispersion forces

H₂O -  - has London dispersion forces, dipole-dipole forces, and hydrogen bonding

Learn more about intermolecular forces at: https://brainly.com/question/12243368

#SPJ1

Answer:

Explanation:

The objects velocity will decrease because the force is opposing its motion

Answer:

0.9g/L.

Explanation:

To calculate the density of hydrogen sulfide (H2S) at 0.7 atm and 322 K, we can use the ideal gas law:

PV = nRT

where P is the pressure in atmospheres (atm), V is the volume in liters (L), n is the number of moles of gas, R is the universal gas constant (0.08206 L·atm/(mol·K)), and T is the temperature in Kelvin (K).

We can rearrange this equation to solve for the number of moles of gas:

n = PV / RT

Next, we can use the molar mass of H2S (34.08 g/mol) to convert the number of moles to mass:

mass = n × molar mass

Finally, we can divide the mass by the volume to obtain the density:

density = mass/volume

Let's assume a volume of 1 L (since the volume is not given in the question). Then we have:

P = 0.7 atm

T = 322 K

R = 0.08206 L·atm/(mol·K)

molar mass of H2S = 34.08 g/mol

First, we calculate the number of moles of H2S using the ideal gas law:

n = PV / RT

n = (0.7 atm) (1 L) / (0.08206 L·atm/(mol·K) × 322 K)

n = 0.0265 mol

Next, we calculate the mass of H2S using the number of moles and the molar mass:

mass = n × molar mass

mass = 0.0265 mol × 34.08 g/mol

mass = 0.9 g

Finally, we calculate the density of H2S:

density = mass/volume

density = 0.9g/1 L

density = 0.9 g/L

Therefore, the density of hydrogen sulfide (H2S) at 0.7 atm and 322 K is approximately 0.9g/L.

True statement for a nuclear reactions is that it changes the identity of the element.

Nuclear reactions are those reactions in which changes in the nucleus of atoms take place in the form of fission and fussion.

Hence identity of element changes.

To know more about nuclear reactions, visit the below link:
https://brainly.com/question/984564

Answer:

1-a

Explanation:

science to understand while tech. make the work easier