Researchers are investigating the effect of pHpH level in water on the breeding habits of the moon jellyfish. As part of a laboratory experiment, they will randomly assign one of three treatments, low pHpH, medium pHpH, or high pHpH, to the water in the tanks that hold the jellyfish.
Which of the following is the best reason for the random assignment of a treatment level to an experimental unit?
Randomization tends to minimize the effects of uncontrolled variables, such as water temperature, so that such factors are not confounded with the treatment effects.

COOH, SOCH, NH are the acids among compounds.

Any substance that, when dissolved in water, imparts an acidic flavor, can change the color of some indicators (such as blue litmus paper turning red), can react with some metals to release hydrogen, can interact with bases to form salts, and can quicken various chemical processes (acid catalysis). Acids are examples of both inorganic compounds known as mineral acids, such as sulfuric, nitric, hydrochloric, and phosphoric acids, as well as organic molecules that belong to the carboxylic acid, sulfonic acid, and phenol families. These substances have one or more hydrogen atoms, which when in solution are released as positively charged hydrogen ions (see Arrhenius theory).

To know more about  acids visit : https://brainly.com/question/16749233

#SPJ4

True;  A chemist prepares a solution of calcium bromide by measuring out of calcium bromide into a volumetric flask and filling the flask to the mark with water.

Compounds with the chemical formula CaBr2(H2O)x are known as calcium bromide. The rare dihydrate (x = 2), the hexahydrate (x = 6), and the anhydrous substance (x = 0) are examples of individual compounds. Each of the white granules dissolves in water, and the hexahydrate crystallises from these solutions. Most drilling fluids employ the hydrated form. It is created when hydrobromic acid, calcium oxide, calcium carbonate, or calcium metal combine with elemental bromine.

It assumes the rutile structure, with octahedral Ca centres bonded to six bromide anions that also form bridges to other Ca centres.

Strongly heated calcium bromide in air will react with oxygen to form calcium oxide and bromine.

Learn more about calcium bromide here:

https://brainly.com/question/889279

#SPJ4

The molar mass of the unknown gas is equal to 11.62 g/mol.

The ideal gas law can be demonstrated as the general equation of the state of a perfect gas.  Ideal gas law gives the product of the volume and pressure of gas equal to the product of the absolute temperature and universal gas constant (R).

The ideal gas equation can be represented in the form equation as follows:

PV = nRT

PV = (m/M) RT

M = mRT/PV

Where m is the mass of the gas, P is the pressure,  V is the volume of the gas,  and R is the gas constant.

Given, the volume of the unknown gas, V = 750 ml = 7.5 L

The temperature of gas, T = 100°C = 100 + 273 = 373 K

The value of the gas constant, R = 0.082atm.L/K mol

The mass of the gas, m = 2.85 g

The pressure of the given gas, P = 760 mmHg = 1 atm

Substituting the values m, V, R, P, and T in the gas equation, we get:

The mass of unknown gas, M = mRT/PV

M = (2.85 ×0.082 × 373)/(1 ×7.5)

M = 11.62 g/mol

Learn more about ideal gas equation, here:

brainly.com/question/3637553

#SPJ1

On a humid day the air is full of water vapour. Hence, evaporation is very slow. This is the reason why wet clothes take longer time on a humid day.

On a humid day, wet clothes take longer to dry because the air has a lot of water vapour and can't hold the water vapour the wet garments produce.

Learn more about Evaporation here:

https://brainly.com/question/24258

#SPJ4

Consider a supersaturated solid solution consisting of components a and b, so the system's temperature and pressure of supersaturation is in a non equilibrium state. in supersaturation the solution contains more solute than in equilibrium.

The solute concentration in solution surpasses the solubility under specific conditions is called as supersaturation.

Thus, Consider a supersaturated solid solution consisting of components a and b, where the abundant species b precipitates out to form particles of pure b. following nucleation, the particles grow to much larger sizes through diffusion. this coarsening, known as Ostwald ripening so the system's temperature and pressure of supersaturation is in a non equilibrium state. in supersaturation the solution contains more solute than in equilibrium.

To learn more about supersaturated here

https://brainly.com/question/16547197

#SPJ4

A buffer solution is used to maintain the pH of a solution. Buffer solution has a constant pH and it does not taking part in any reaction directly. Thus, option C is correct.

pH of a solution is the concentration of H+ ions in the solution. It measures how acidic or basic the solution is. The solution of pH 7 is neutral and solution with pH below 7 is acidic. Basic solutions has the pH above 7.

A buffer solution is used to maintain the pH of a solution in a constant either in acidic or basic range. There are two types of buffer solutions acidic buffer and basic buffers.

An acidic buffer is made by mixing  a weak acid with its salt and a basic buffer is made by mixing a weak base with its salt. A buffered solution will change its pH up on the addition of an acid or base. Hence, option C is correct.

To find more on buffer solutions, refer here:

https://brainly.com/question/13169083

#SPJ1

The three negative electrons that surround the lithium atom's nucleus, on the other hand, make it neutral.

The nucleus manages and regulates the operations of the cell, houses the genes and molecules that contain the genetic information (such as growth and metabolism). Inside the nucleus, nucleoli, which are tiny structures, are frequently found. The nuclear components appear to be suspended in a gel-like matrix called the nucleoplasm.

The nucleus is recognized as one of the most important parts of eukaryotic cells because of its function in the storage, recovery, or duplication of genetic information. It is an organelle that has two membranes connected to it and houses chromatin, a type of genetic material.

To know more about nucleus  visit:

https://brainly.com/question/17704494

#SPJ4

The molarity of the acetic acid solution is 0.7576M

What is molarity?

It is the proportion of an ingredient in a specific volume of solution. The number of moles of a solute in a litre of solution is referred to as molarity. 

What is acetic acid ?

With the chemical formula CH3COOH, acetic acid is also referred to as ethanoic acid, ethylic acid, vinegar acid, and methane carboxylic acid. Vinegar's distinctive smell is caused by acetic acid, a fermentation byproduct. Water-soluble acetic acid makes up 4-6% of vinegar.

molar mass of acetic acid (HC2H3O2 )   = 60g/mole

molarity of acetic acid       = 1M  = 1 mole/L

molarity of acetic acid     = 1 mole/L * 60g/mole

                                       = 60g/L  >>>>>answer

9.  CH3COOH + NaOH ------------> CH3COONa + H2O

   1 mole            1 mole

 CH3COOH                                                                NaOH

M1   =                                                                        M2  = 0.2M

V1   = 25ml                                                                V2   = 94.7ml

n1   = 1                                                                        n2  = 1

                    M1V1/n1    =     M2V2/n2

                      M1            =    M2V2n1/V1n2

                                       =    0.2*94.7*1/25*1    = 0.7576M

molarity of acetic acid     = 0.7576M

Therefore, the molarity of the acetic acid solution is 0.7576M.

Learn more about molarity  from the given link.

https://brainly.com/question/24305514

#SPJ4

A student combined a soil sample with water, capped the container, and then forcefully shook it to determine the percent change in mass of the soil sample.

The amount of matter that makes up every item or body is the greatest way to understand mass. Everything that we can see has mass. Tables, chairs, beds, footballs, glasses, and even the air are examples of items with mass.

An object's or a substance's mass is a measurement of how much matter there is in it. Smaller masses can be measured in grams, but the kilogram (kg) is the standard SI unit for mass (g).

To know more about mass visit :

https://brainly.com/question/14651380

#SPJ4

The answer is 1.5 ounces.

Although the U.S. government has never declared an official measurement for this most states and bars use this amount for shots. Shots are used as part of happy hour drinks or in popular cocktail recipes. can be provided separately. Pubs and bars typically serve spirits in 25ml increments. This is roughly 1 unit of alcohol per unit.

But with many pubs and bars switching to 35ml or 50ml units these days, you may be drinking a lot of alcohol without realizing it. A portion is a measured amount of food or drink. B. A piece of bread or 1 cup of milk. Many foods presented as single servings actually contain multiple servings.

Learn more about Ounces here:-https://brainly.com/question/2853335

#SPJ4

DUMP molecule serve as immediate precursor for synthesising dttp.

To learn more about molecules refer to :

https://brainly.com/question/26044300

#SPJ4

In a chemical reaction, one or more substances—also known as reactants—are changed into one or more additional substances—also known as products.                                                                                                 Chemical elements or chemical compounds make up substances. Color change, gas production, smell change, temperature change are all examples of chemical transition circumstances. Chemical transitions, commonly referred to as chemical reactions, are the conversion of one or more chemicals into one or more brand-new, distinct substances. Atoms are rearrange during chemical reactions, and as new products are produced, the reaction is accompanied by an energy change. The reaction of sodium and water to produce sodium hydroxide and hydrogen is an illustration of a chemical change. A great deal of energy is released, causing the hydrogen gas to burn spontaneously in the atmosphere.

Hence, chemical change are irreversible changes.

To know more about Irreversible changes.

https://brainly.com/question/16991902

#SPJ4

Answer:

2ZnS(s) + 3O2(g) → 2ZnO(s) 2SO2(g)

(H = -879 kJ/mol would be the answer, I believe.

Explanation:

Brainliest Please?

Alpha and beta particles originate from the nucleus. protection from radiation is necessary because if radiation passes through the body it can damage cells. exposure to radiation can be limited by increasing the distance from the radioactive source.

The Alpha and  beta particle are the unstable atoms on decay. the radiation is very very harmful to us it can damage the cells or DNA and have impact on mutation. exposure to radiation can be limited by increasing the distance from the radioactive source.

Thus, Alpha and beta particles originate from the nucleus. protection from radiation is necessary because if radiation passes through the body it can damage cells. exposure to radiation can be limited by increasing the distance from the radioactive source.

To learn more about Alpha and beta particle here

https://brainly.com/question/24279404

#SPJ4

The reagent that will efficiently convert but-1-yne into hex-3-yne NaNH2, and CH3CH2I

The preparations of alkynes are very similar to those of the alkenes. The main preparative reactions generally involve the elimination of groups or ions from the molecules, resulting in the formation of the π bonds.

Dehydrohalogenation is the loss of a hydrogen atom and a halogen atom from the adjacent alkane carbon atoms that leads to the formation of an alkene. The loss of additional hydrogen and halogen atoms from the double‐bonded carbon atoms leads to alkyne formation. The halogen atoms can be located on the same carbon that is called a geminal dihalide or on adjacent carbons that is a vicinal dihalide.

Butyne is a terminal alkyne. It has acidic hydrogen which can be removed by using a strong base to convert butyne into butynide.

The reagents which can be used to remove the acidic hydrogen from butyne are NaH or NaNH2.

Butynide will then react with ethylhalide to form hexyne.

The reagents which can be used for ethylation of butynide are;

CH3CH2I or CH3CH2Cl.

To know more about reagents

https://brainly.com/question/27180041

#SPJ4

The values in cells A2 and A20 are added using the Excel notation =SUM(A2:A4).

The values in a range (a group of cells) can be added simply with a formula, however the SUM function is more user-friendly when working with bigger numbers. =SUM(A2:A6) is less likely to contain typographical errors than =A2+A3+A4+A5+A6.

In order to form the equation:

Put =SUM and the opening parenthesis in a cell ().

Enter the first formula range, commonly known as an argument, by typing A2:A4 (a piece of information required for the formula to function).

Type a comma to separate the first and second arguments (,).

The next argument to type is C2:C3.

Type a closing parenthesis, then press Enter.

For more information on addition in excel kindly visit to

https://brainly.com/question/12961162

#SPJ4

The answer is you will need 300 ml of 65% solution and 150 ml of 20% solution to produce 450 ml of a 50 per cent solution.  

According to the question:

Start by defining variables to represent the amounts of each of the solutions that are going to be mixed.

So let x = the amount of the 65% solution, and y = the amount of the 20% solution.

First of all, you know that x + y = 450, because after they are mixed you want to have 450 ml of the 50% solution.

Second, look at how much acid is in each of the starting solutions and how much is in the ending solution.

The 65% solution is 65% acid, so the amount of acid in it is 65% of x, or .65x. Similarly, the amount of acid in the 20%  

solution is 0.2y

At the end, the amount of acid you want to end up with is 50% of 450ml, so that's 225 ml.

When you mix the two solutions, you're not going to change the total amount of acid you started with. This means that  

0.65x + 0.2y = 225

So, you have two solutions with two unknowns, and that's something you can solve:

x + y = 450

0.65x + 0.2y = 225

Let's use elimination. Multiply the first equation through by 0.65:

0.65x + 0.65y = 0.65*450 = 292.5

Now you have:

0.65x + 0.65y = 292.5

0.65x + 0.2y = 225

Subtract:

0.45y = 67.5

Divide by 0.45

y = 67.5 / 0.45 = 150

Since x + y = 450, that means that x = 300.

So, you will need 300 ml of 65% solution and 150 ml of 20% solution to produce 450 ml of a 50 per cent solution.  

To learn more about Mixing of acid solution https://brainly.com/question/29573303

#SPJ4

Steps that are required to generate a Wittig reagent are: -reaction of phosphonium salt with a strong base and reaction of alkyl halide with Ph3P.

Wittig reagents are made by deprotonation of alkyl phosphonium salts and then this reaction can be reversed. The methodology is useful in the preparation of unusual Wittig reagents. Alkylation of Ph3P=CH2 with a primary alkyl halide R−CH2−X, gives out substituted phosphonium salts: Ph3P=CH2 + RCH2X → Ph3P+ CH2CH2R X.

Wittig reaction has a low atom economy because triphenylphosphine oxide is formed as a byproduct but this reaction can be improved in the absence of solvent.

To know more about Wittig reagent, refer

https://brainly.com/question/17093654

#SPJ4

The statement 'the first step of a direct-marketing program is to determine which markets to target through the use of a mailing list or a marketing database' is false.

In the field of business, such a strategy by which a company or organization directly reaches out to its customers or potential buyers of products, rather than including any third party is referred to as direct marketing.

The first step in direct marketing is to recognize your target market. The target market is recognized by fully researching about the market and its aspect.  A mailing list or a marketing database is not used for this purpose. Rather fully detailed research analytics into the insight is used. Hence, the statement is false.

To learn more about direct marketing, click here:

https://brainly.com/question/28215890

#SPJ4

About approximately four billion years ago, the first organic compounds started to form. This could have occurred when chemical processes in the early atmosphere of Earth were triggered by lightning.

In essence, macromolecules are polymers, which are composed of several long chains of monomeric molecules. Proteins, carbohydrates, and nucleic acids all exist as lengthy polymers. They are referred to as macromolecules because of their huge size and polymeric makeup.

They frequently result from the synthesis of smaller molecules like as proteins, lipids, and polysaccharides. A polymer is another term for a macromolecule that comes from the Greek word poly-, which means "many units."

To know more about macromolecules visit:

https://brainly.com/question/21263612

#SPJ4

An saturation pressure of each component in a gas mixture is the force that would occur is if gas alone covered the complete volume of the original mixture with the same temperature, partial pressure of 627.0c.

Helium was mostly commonly used to fill balloons for celebrations and parades since it is a secure, non-flammable gas. Helium, however, is an essential element in a variety of industries, including high-tech manufacturing, medical technology, space travel, and national security. Helium, the second most common element in the cosmos, is in little supply on Earth. It is the lightest gas, colorless, odorless, inert, and has a low boiling point. It is a byproduct from nuclear fusion and nuclear decay.

PV = nRT

=41.8*25.0*6.00

=627.0

A volume of 6.00 l at 25.0oc is 627.0c.

To know more about helium gas visit:

brainly.com/question/13645498

#SPJ4

The definition of Marxist criticism is an approach to analyzing political and social issues in terms of conflicts between people from various socioeconomic strata.

Gallup has been asking Americans to categorize themselves into the upper, upper-middle, middle, working, and lower social classes for a number of years. These five class names serve as a good example of the basic methodology employed by both researchers and the general public.

a technique to categorize people according to their employment status, income level, and level of education. Low, medium, or high are typical classifications for socioeconomic level. When compared to people with greater socioeconomic level, those with lower socioeconomic status typically have fewer access to financial, educational, social, or health resources.

To know more about socioeconomic visit:

https://brainly.com/question/1543020

#SPJ4

84 mL of 0.060 M NaF is mixed with 28 mL of 0.15 M Sr(NO3)2. the concentration of Sr2+ in the final solution is 0.015 M.

NaF = 84 mL = 0.084 L

Concentration = 0.060 M

Sr(NO₃)₂ = 28 mL = 0.028 L

molarity = 0.15 M.

molarity of NaF = mole / total volume

                          = (0.084 × 0.060) / 0.112

                          = 0.045 M

molarity of  Sr(NO₃)₂  = mole / total volume

                                   = (0.028 × 0.15) / 0.112

                                   = 0.0375 M

the equation is given as :

Sr²⁺   +  2F⁻  ---->  SrF₂

ksp = [Sr²⁺ ] [ F⁻]²

2 × 10⁻¹⁰ = (0.037 + x)(0.045 +2x)²

Sr²⁺ = x + 0.0375 = 0.015 M

The concentration of Sr²⁺ = 0.015 M.

Thus, 84 mL of 0.060 M NaF is mixed with 28 mL of 0.15 M Sr(NO3)2. the concentration of Sr2+ in the final solution is 0.015 M.

To learn more about concentration here

https://brainly.com/question/9441613

#SPJ4

In the hydrogenation of alcohol, Ethanol is the reducing agent and it loses electron.

Alcohol hydrogenase transform ethanol to Acetaldehyde. This known as carcinogen. In this Acetaldehyde is more toxic compound. Alcohol dehydrogenases catalyze the oxidation of primary and secondary alcohols to the corresponding aldehyde or ketone by the transfer of a hydride anion to NAD+ with release of a proton.

Ethanol + NAD^+ ---> acetaldehyde + NADH + H^+

The half reactions are:

Ethanol --------->Acetaldehyde + 2H^+ + 2e (oxidation)

NAD+ + 2H+ + 2e- ------->NADH + H^+ (Reduction)

Ethanol is oxidized to acetaldehyde, because it loses e- .NAD+ is reduced to NADH, because it gain of e− . NAD is the oxidizing agent. Oxidizing agent gains e− and therefore reduced during reaction. Ethanol is the reducing agent. Reducing agent loses e−and therefore oxidized during reaction . Alcohol dehydrogenase is also involved in the toxicity of other types of alcohol.

To know more about Dehydrogenation please visit:

https://brainly.com/question/16026648

#SPJ4

The correct answer is BH₃.

Boron is the fifth element in the periodic table.

Hydrogen is the first element in the periodic table.

A boron-hydrogen compound's empirical formula is BH₃.

It has a 27.7 g/mol molar mass.

As it joins three atoms, the boron-hydrogen-boron bridge link, which has two electrons, is also known as a three-center, two-electron bond.

An enduring attraction between atoms or ions known as a chemical bond is what allows molecules and crystals to form. The bond may be created by the sharing of electrons in covalent bonds or by the electrostatic attraction of two oppositely charged ions, as in ionic bonds.

As it joins three atoms, the boron-hydrogen-boron bridge link, which has two electrons, is also known as a three-center, two-electron bond.

In the earth's subsurface, there is just free hydrogen. The majority of hydrogen is found in stars and gas giant planets. Hydrogen dominates the composition of the Sun. The pressure is so intense in the inside of stars that hydrogen atoms are changed into helium atoms.

To know more about Hydrogen visit: brainly.com/question/28937951

#SPJ4

The equal volumes of 0.0300 m nh3 and 0.0150 m hcl are mixed together the concentrations of nh3 and nh4 in the reaction are  0.0075 M .

Suppose the every identical quantity is V.

Read more about reaction:

https://brainly.com/question/24795637

#SPJ4

Here using the radius ratio rule

Therefore ,

[tex]\frac{RA+}{RB-}[/tex]  = [tex]\frac{ 0.069 }{0.140 }[/tex]

[tex]\frac{RA+}{RB-}[/tex] = 0.49

Hence coordination number is  0.49.

What is Radius Ratio Rule?

Radius Ratio is the ratio of smaller ionic radius (cation) to bigger ionic radius (cation) (anion). Radius ration = rs/rl.

What is its significance?

Hence  0.49 is a correct answer.

To know more about Radius Ratio Rule follow link

https://brainly.com/question/10232398

#SPJ4

​

​

Structure A is the electron rich compound and starting material is electron poor one.

What is electron rich carbon?

The carbon that contain a negative charge or attached with a electropositive atom is known as electron rich carbon.

What is electron poor carbon?

The carbon that contain a positive charge or attached with a electronegative atom is known as electron poor.                                      Read more about electron rich atom:

https://brainly.com/question/2526974

#SPJ4

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

Question:

The effect of exposure is the exposure to high level of radiation will b urn the skin.

The effect of the radiation exposure is it will cause a severe damage to your skin and it cause radiation sickness. the light exposure to the retina will cause photoreceptor cell , damage to the condition. the high level of the radiation exposure  will cause the life long health damage like cancer, cardiovascular diseases etc.

The radiation exposure also cause the hair loss. the harmful effect of the radiation exposure on the body is it leads to the thyroid, heart and brain functioning.

To learn more about exposure here

https://brainly.com/question/28069199

#SPJ4

Answer: Chlorine.

Explanation: The correct answer to this equation when fluorine is added to sodium chloride gives sodium fluoride and chlorine.

Fluorine + sodium chloride →sodium fluoride +Chlorine

A chemical reaction states The rearrangement of the molecular or ionic structure of a substance, rather than its physical change or nuclear reaction. A chemical reaction always has reactants and products.

A chemical reaction occurs when compounds or substances undergo a chemical change to form different compounds or substances.

To check more answers to this chemical equation refer to
https://brainly.com/question/24978426