the ph of a 7.50 x 10-2 m, 0.250 l aqueous solution of a weak monoprotic base is 10.5 . what is the value of the pkb of the base?

A person floats much higher in the Dead Sea than in ordinary water because salt water has a higher density than fresh water. Saline water has a density of (1080 kg m per cube) while fresh water has a density of ( 1000 kg m per cube). Because of this, swimming in salt water is simpler for swimmers.

Compared to the 3.5% salinity of the Mediterranean, the Dead Sea has a salinity of 34.2%. It ranks behind the Don Juan Pond and Lake Vanda in Antarctica, the Lake Assal in Djibouti, and Lake Vanda as the fourth saltiest body of water in the world. The Dead Sea doesn't pour out, which is one of the causes of excessive salinity.

To learn more about the Dead sea here:

https://brainly.com/question/12913257#

#SPJ4

Complete Question

The water of the Dead Sea is extremely salty. which gives it a very high density of 1240 kg/m^3. Explain why a person floats much higher in the Dead Sea than in ordinary water.

The superscript preceding each hydrogen atomic symbol (h) represents the mass number.

The mass number is the total number of protons and neutrons in the nucleus of an atom. It is represented by the superscript preceding the atomic symbol of an element. In the case of hydrogen (H), hydrogen atoms can have different mass numbers due to the presence of different numbers of neutrons.

For example, the most common isotope of hydrogen, known as protium, has a mass number of 1. It is denoted as ¹H. Deuterium, another isotope of hydrogen with one neutron in addition to one proton, has a mass number of 2 and is represented as ²H. Tritium, which contains two neutrons and one proton, has a mass number of 3 and is denoted as ³H.

The superscript preceding the atomic symbol provides information about the specific isotope of the element and allows distinguishing between isotopes with different numbers of neutrons.

To learn more about mass number, here

https://brainly.com/question/18803094

#SPJ4

Air bubbles must be expelled from the buret tip in order to ensure accurate and precise volume measurements during titrations or other laboratory procedures.

When performing titrations, the volume of the solution being dispensed from the buret needs to be measured precisely. Air bubbles in the buret tip can lead to inaccurate volume readings, as they occupy space that should be occupied by the liquid solution. This can result in an incorrect amount of the solution being added, leading to errors in the calculated concentrations or stoichiometric ratios.

Expelling the air bubbles ensures that only the liquid solution is being dispensed from the buret, allowing for more accurate and reliable measurements. It helps maintain the integrity of the experimental results and ensures that the correct amount of solution is added during the titration process.

To know more about stoichiometric ratios refer to-

https://brainly.com/question/6907332

#SPJ11

Option (A) is correct. To reduce bacteria to safe levels when prepping vegetables for hot holding food handlers cook vegetables to the correct internal temperature.

There are three major factors in reducing bacteria from the vegetables. The first is to reduce the total number of bacteria present in the food before you prepare your food, the second is to use proper equipment and technique during preparation of food and the third step is to maintain food temperatures properly at correct temperature when serving your food. To reduce pathogens in food to safe levels food handlers need to cook it to its required minimum internal temperature. Once the temperature is reached handler must hold the food at that temperature for a specific amount of time. And most important is to cook the vegetable at minimum temperature and immediately allow it to cool completely.

To learn more about Bacteria in vegetables

https://brainly.com/question/30414616

#SPJ4

The complete question is,

How can food handlers reduce bacteria to safe levels when prepping vegetables for hot holding?

A.  Cook the vegetables to the correct internal temperature.

B. Prep root vegetables before prepping green, leafy vegetables

The pH of a 2.45 x 10^-3 M sulfuric acid solution is 2.61.

The pH of a solution can be calculated using the formula:

pH = -log[H+]

where [H+] represents the concentration of hydrogen ions in the solution.

For a strong acid like sulfuric acid (H2SO4), it is completely dissociated in water, meaning all of its molecules will release their hydrogen ions (H+) into the solution. Therefore, the concentration of hydrogen ions in the solution will be equal to the concentration of sulfuric acid.

In this case, the concentration of sulfuric acid is 2.45 x 10^-3 M. Therefore, the concentration of hydrogen ions is also 2.45 x 10^-3 M.

Now we can calculate the pH using the above formula:

pH = -log[H+]

= -log(2.45 x 10^-3)

= 2.61

Therefore, the pH of a 2.45 x 10^-3 M sulfuric acid solution is 2.61.

To know more about Sulfuric acid:

https://brainly.com/question/30425882?referrer=searchResults

#SPJ11

Answer:

solid to liquid = melting

liquid to gas = evaporation

solid to gas = sublimation

liquid to solid = freezing

gas to liquid = condensation

gas to solid = deposition

Explanation:

Answer: 1) melting

2) Evaporating

3) sublimation

4) Freezing

5) condensation

6) Deposition

Explanation:

Additional variables can make an experiment result unreliable.

Additional variables can make an experiment result unreliable because they can introduce confounding factors that affect the outcome of the experiment. Confounding variables are extraneous factors that are not controlled or accounted for in the experiment but may influence the results.

To ensure the reliability of an experiment, researchers should carefully control for as many extraneous variables as possible, using random assignment and other methods to ensure that the groups being compared are as similar as possible except for the factor being studied.

Learn more about experiment:https://brainly.com/question/30055326

#SPJ1

Answer:

Chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes

Answer:

hope it helps you a little

The ground-state electron configurations of chromium (Cr) and copper (Cu) are different from what we might expect based on their positions in the periodic table.

According to the Aufbau principle, electrons fill orbitals in increasing order of their energy levels. However, the ground-state electron configurations of chromium and copper deviate from this principle.

In the case of chromium, instead of the expected configuration of 4s² 3d⁴, the actual ground-state configuration is 4s¹ 3d⁵. This configuration allows for a half-filled d orbital (3d⁵), which is a more stable arrangement due to electron-electron repulsion being minimized.

Similarly, for copper, the expected configuration would be 4s² 3d⁹, but the actual ground-state configuration is 4s¹ 3d¹⁰. By having a completely filled d orbital (3d¹⁰), copper achieves greater stability through the exchange energy, where the energy is minimized by having paired electrons in the same orbital.

The deviation from the expected configurations in Cr and Cu demonstrates the importance of achieving stable configurations, even if it means redistributing electrons to achieve half-filled or electron completely filled d orbitals. This phenomenon is known as "irregular electron configuration" and is a result of the interplay between electron-electron repulsion and the exchange energy, which favors stable configurations.

Learn more about electron here

https://brainly.com/question/31855977

#SPJ11

Answer:

So, the elements with similar properties to sodium (Na) are all of those elements in the same Group.

Explanation:

The ones "most" similar would be the ones closest in mass as well. Those would be Lithium (Li) and Potassium (K).

Answer:A) N and P

Explanation:

N and P, because they are in the same group on the periodic table. This is because they both have 3 valence electrons, and properties of elements are dependent partly on the number of valence electrons they have.

It is the charterer's duty to hire a ship for a certain period of time to transport cargo or passengers.

The charterer's job is to hire a ship for a set amount of time to transport goods or people. They are in charge of negotiating the charter conditions with the vessel owner or broker, setting up the required licences and paperwork, and ensuring the timely and safe delivery of cargo or passengers. Broker: The broker's job is to make it easier for the charterer and the vessel owner to come to an agreement. They serve as middlemen, using their connections and market expertise to identify suitable vessels and agree upon conditions of charter that are acceptable to both sides. A appropriate vessel must be provided by the vessel owner in order to satisfy the charterer's needs. They keep the vessel seaworthy, adhere to pertinent laws, and guarantee effective operations throughout the charter.

To know more about charter, here:

https://brainly.com/question/27998149

#SPJ4

True. It would take more energy to boil water( which is polar) than to boil a liquid made of non-polar molecules.

Thus we can conclude that it takes more energy to boil water than to boil a liquid made of non-polar molecules.

Learn more about intermolecular forces at https://brainly.com/question/13588164

#SPJ4

Answer:

porous = allowing liquid or air to pass through slowly

I hope it's helpful

Answer:

It is a rock or or other materials, having minutes interstices through which liquid or air may pass.

Answer:

The clear liquid is less dense than the black liquid, which is why it floats on top. If the volume were different, you would visually see more clear liquid than black and vice versa.

The clear liquid is less dense than the black liquid

Answer:

A. The clear liquid is less dense than the black liquid

Explanation:

Since the clear liquid since on top of the black one it's density is less. Whatever liquid has a higher density will sink to the bottom of the flask.

Answer: Electron

Explanation:An electron is most likely to be found in an energy level within an atom.

Answer:

yes

Explanation:

Answer:

578.....882...767..86

Answer:

Br

Explanation:

Because Fl is a halogen and also Br is the only halogen element in the choices

The element that would most likely have similar properties with that of Fluorine (F) is Bromine (Br).

The periodic table shows the tabular arrangement and representation of chemical elements. On the periodic table, elements are arranged in groups(vertical columns) and periods(horizontal rows).

Elements in the same groups are said to exhibit similar chemical properties.

From the periodic table, Fluorine (F) and Bromine(Br) are members of the halogen families and they exhibit the same chemical properties.

Learn more about the Periodic table here:

https://brainly.com/question/5216907

Answer:

The economics in costing​ is explained below in complete details.

Explanation:

The economic cost is the blend and mixture of wastes of any assets that have a worth connected to them by any one person. The economic cost is practiced largely by economists as a method to examine the prudence of one sequence of performance with that of another. The economic cost varies from accounting cost because it incorporates opportunity cost.

Answer:

mixture i think

Explanation:

Answer:

mixture

Explanation:

Answer:

more energy is absorbed when the bonds in the reactants are broken

Answer:

twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete

Explanation:

twenty-four grams of magnesium metal reacts with sixteen grams of oxygen gas to form magnesium oxide. According to the law of conservation of mass, how much magnesium oxide will there be after the chemical change is complete

When the gas emits at a rate that is 0. 667 times that of CO₂, it has a molar mass of 62.9 g/mol.

Graham's Law states that a gas's rate of effusion is inversely related to the square root of its molar mass.

√[M(b)/M(a)] = R(a)/R(b)

R is the effusion rate.

square root = sqrt = √

the molar mass, M

Square root of R(a)/R(CO) is √[M(CO)/M(a)].

(0.667)² = 28 g/mol/ M(a)

( by squaring both sides)

M(a)(0.667)² = 28

M(a) = 28/(0.667)²

M(a) = 62.9 g/mol.

The molar mass of the unidentified gas is 62.9 g/mol.

What effect has Graham's law?

According to Graham's law of diffusion, the ratio of the square root of the molecular weights of gas particles to their diffusion rates is equivalent.

To know more about Graham's law of diffusion, visit:

brainly.com/question/14004529

#SPJ4

Answer: a<33

Explanation: have a good day! :)

The following substances are normally eluted from columns in the following order: alkyl halides, saturated hydrocarbons, unsaturated hydrocarbons, ethers, esters, ketones, amines, alcohols, phenols, and acids. Frequently, salts and polymeric compounds do not elute.

The more polar molecules will elute from the column following the non-polar ones. Elution is a result of chemicals interacting with the stationary and mobile phases. Therefore, in typical column chromatography, non-polar substances will elute first.

Elution is a result of chemicals interacting with the stationary and mobile phases. Therefore, in typical column chromatography, non-polar substances will elute first.

To know more about catalysis experiment visit:-

https://brainly.com/question/29724341

#SPJ4

Answer:

Earth is built around compounds that contain elements such as carbon, nitrogen, hydrogen and oxygen

Explanation:

Answer:

a scientific question

Procedure

Conclusion.

Explanation:

Scientific investigation is usually carried out to explain and give answers to natural phenomenon. Now, this scientific investigation is performed through the three main types as described in the question.

With that being said, the most common parts of all types of investigation are :

1. Scientific question: In this stage, questions are usually asked on the basis of observation made which could be answered.

2. Procedure: In this stage, the dimension of the steps are followed to answer and test the scientific question.

3. Conclusion: This is the primary aim that we check when done with our sample values

Answer:

B and C

Explanation:

is it multiple choice question??

Van der Waals forces are the interaction between the molecules and the atoms. It increases with an increase in the molecular size and the number of electrons. Thus, options B and C are correct.

Van der Waals forces are the weak forces of attraction and repulsion present between the atoms and the molecules of the compounds. They are also called London Dispersion Forces and dipole-dipole forces.

An increase in the number of electrons and size of the molecule increases the surface area and the electron cloud which in turn, increases the Van der Waals force.

The intermolecular force increases as in large atoms or molecules the valence are held loosely as they are far from the nucleus or the center of the atom.

Therefore, the size and the electron increase the Van der Waals force.

Learn more about Van der Waals force here:

https://brainly.com/question/11457190

#SPJ5

Parallel flow will be preferred in a ship's engine room since the required surface area is lesser than in counter flow.

The Log Mean Temperature Difference (LMTD) when the heat exchanger is counter flow is 43.13°C.

The formula for calculating LMTD in counter flow is:

LMTD = ((80-35) - (45-25))/ln((80-35)/(45-25))

LMTD = (45)/(ln(45/20)) = 43.13°Cb)

The LMTD when the heat exchanger is parallel flow is 30°C.

The formula for calculating LMTD in parallel flow is:

LMTD = ((80-25) - (45-35))/ln((80-25)/(45-35))

LMTD = (55)/(ln(55/10)) = 30°Cc) Two factors that will affect the overall heat transfer coefficient of a heat exchanger are:

Surface Area of the heat exchanger Temperature Difference between the fluids

In a ship's engine room where there is limited area for equipment, parallel flow is preferred. The surface areas of the two types of heat exchanger are given by the formula:For counter flow:

A = Q/(U×LMTD)

For parallel flow:

A = Q/(U×LMTD/√(2))

The surface area for counter flow is:

A = (1×4180×(80-45))/(300×43.13)A

= 0.877 m²

The surface area for parallel flow is:

A = (1×4180×(80-45))/(300×30/√(2))A

= 0.717 m²

To know more about parallel visit :

brainly.com/question/30761817

#SPJ11

Based only on intermolecular forces, the least soluble compound in CH3CH(OH)CH3 (also known as ethanol) would be A) CH3OCH3 (also known as dimethyl ether).

In CH3CH(OH)CH3, the dominant intermolecular force is hydrogen bonding. Ethanol molecules can form hydrogen bonds with each other through the hydroxyl (-OH) groups. When a solute is added to a solvent like dissolves meaning that substances with similar intermolecular forces tend to dissolve in each other.

Comparing the compounds listed:

A) CH3OCH3 (dimethyl ether) lacks a hydroxyl group and cannot form hydrogen bonds with ethanol. It only exhibits weak London dispersion forces. Therefore, it would be the least soluble in ethanol.

B) CH3CH2CH3 (propane) also lacks a hydroxyl group and cannot form hydrogen bonds with ethanol. However, it has more surface area and can exhibit stronger London dispersion forces compared to dimethyl ether. Therefore, it would be more soluble than dimethyl ether but still less soluble than compounds with hydrogen bonding capabilities.

C) H2O (water) is highly soluble in ethanol due to its ability to form hydrogen bonds with the hydroxyl groups of ethanol.

D) CH3CH2CH2OH (1-propanol) is also highly soluble in ethanol due to its ability to form hydrogen bonds with the hydroxyl groups of ethanol.

Therefore, the least soluble compound in CH3CH(OH)CH3 would be A) CH3OCH3 (dimethyl ether).

Know more about solvent here :

https://brainly.com/question/11985826

#SPJ11

Answer:

here is where you can buy it

https://www.walmart.com/ip/Product-Of-Hunts-Tomato-Paste-Can-Count-1-Tomato-Paste-Grab-Varieties-Flavors/850453511?wmlspartner=wlpa&selectedSellerId=4648&&adid=22222222228000000000&wl0=&wl1=g&wl2=m&wl3=42423897272&wl4=aud-430887228898:pla-51320962143&wl5=9012391&wl6=&wl7=&wl8=&wl9=pla&wl10=115056687&wl11=online&wl12=850453511&veh=sem&gclid=Cj0KCQjw9ZGYBhCEARIsAEUXITUEOCgO6I5Xsg6DjNJSFFzf6pLMzFzhjW7WipqMInuuYo8EfjNoRAkaAp17EALw_wcB&gclsrc=aw.ds