11. Methanoic acid, HCOOH, is a weak acid with a K. = 1.6 x 104. Calculate the pH of a. A 0.20 M solution of methanoic acid. b. A solution of 6.8 g of solid methanoic acid dissolved in 2.0 L of distilled water.

Answer:

I’m not sure if this is right but, 3 moles of oxygen at STP will occupy a volume of 3×22. 4=67. 2 L.

Explanation:

The standard temperature and pressure conditions have a pressure of 1-mole and a volume of 22.4 L. At STP, 3.20 moles of gas will have a volume of 72 L.

The ideal gas equation relates the volume to the moles of the substance. At STP conditions it is known that 1 mole contains 22.4 L.

Given,

Moles of gas = 3.20 moles

1 mole gas at STP = 22.4 L

The volume at 3.20 moles,

= 3.20 × 22.4

= 72 L

Therefore, 72 L is the volume at 3.20 moles.

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Answer:

I think it has to do with batteries 'n stuff

AH— Ampere Hour

Answer:

At STP 1 mol of any gas occupies a volume of 22.4 liters. So the calculation is:

206.08/22.4 = 9.2 mol

Answer:

4.Anything that has mass

Explanation:

In order to appreciate what matter is, we must first know that matter is the 'stuff' that makes up the universe. Everything in the universe is composed of matter. Matter in turn is made up of atoms. Intact mass is the quantity of matter in a body.

All matter must have mass and occupy space. Hence all matter must have a measurable mass. This is a fundamental property of all matter. Hence every object in the universe has mass because it is composed of matter. We find matter in our plates, spoons , clothes and indeed everything we see in the universe! For instance, you can measure the mass of a spoon because it is made of matter which has mass and occupy space.

The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.

The electrochemical cell is the cell that is capable of generating the electrical energy from the chemical reactions or by the use of the electrical energy to cause the chemical reaction. The conditions for a standard electrochemical cell. select one or more : pressure of 1 atm temperature of 298 k solution concentrations of 1 M.  

There are the two types of the electrochemical cells is as follows : the galvanic called the electrolytic cells. the galvanic cell is also called as the voltaic cell.

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The calculated value at 50 percent and 75 percent loss could be expected to be given by the equation t1/2 = ln(2)/λ . Hence t1/2 is independent of time.

Now,

 according to the given question,

   We have to calculate the values for  50% and 75% loss.

Hence,

  The difference in time is to be (300-160) = 140 sec, which means that  it is closer to 160s to that of half-life.

This is expected result.

The value of A₀ does not matter to calculate the half-life. Whatever the initial value is , it will always take the same time to get halved.

  We have,  

 N = No e– λt                                  

where

N = No/2  

t = t1/2

Now

½ = e– λ t1/2

λ t1/2 = ln (2)

hence,

 t1/2 = ln(2)/λ

Hence,

  t1/2 is independent of time.

Thus, from the above conclusion we can say that the calculated value at  50% and 75% loss would be expect to be given by t1/2 = ln(2)/λ . t1/2 is independent of time.

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Ammonia and phosphoric acid are the reactants for the reaction 9, for the formation of Ammonium Phosphate.

What are ionic reactions?

Ionic reaction is the reaction of ions that are anions and cations to form a compound in a medium in which they are dissolved. When ions of water-soluble salts interact with each other in aqueous medium results in the formation of water-insoluble salts.

9) 3NH₃ + H₃PO₃ → (NH₄)₃PO₄

10) CaCO₃ + HCl → CaCl₂ + H₂CO₃

11) SnO₂ + HCl → SnCl₂ + H₂O

12) Ca(OH)₂ + HNO₃ → Ca(NO₃)₂ + H₂O

13) C₃H₅O(COOH)₃ + 3KOH → C₃H₅O(COOK)₃ + 3H₂O

14) 2Mg + C₃H₅O(COOH)₃ → (C₃H₅O(COO)₃)Mg₂ + H₂

15) H₃PO₄ + 3KOH → K₃PO₄ + 3H₂O

Therefore, Ammonia and phosphoric acid are the reactants for the reaction 9, for the formation of Ammonium Phosphate.

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Answer:  V1/V2 = 0.357,

V2 = (V1/0.357) or 28.0*V2

Explanation:  Use the combined gas law:  P1V1/T1 = P2V2/T2  We want to find V1/2 (or V2/V1).  Rearrange:

V1/V2 = (P2/P1)(T1/T2)

The units all cancel.  Temerature is constant, so (T1/T2) = 1.

V1/V2 = (125/350)*(1)

V1/V2 = 0.357

\((NH_4(+))\) No, ammonia is not a good conductor of electricity due to its low level of dissociation and the resulting low concentration of ions in the solution.

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A chemical reaction is when reactants are converted into another substance (also called products). Their reaction rearranges the constituent atoms of the reactants to give different substances as products.

I hope this helps! Please mark me as brainliest!

Have a wonderful day!

Answer:

La respuesta está en el enunciado

Explanation:

Una solución química es definida como una mezcla de dos o más sustancias donde, la que está en mayor proporción, es definida como el solvente y los componentes que están en menor cantidad se definen como los solutos.

En general, en la formulación de bebidas, el solvente es agua, los solutos son otros componentes como saborizantes y colorantes que permiten que el consumidor tenga experiencias agradables con la bebida.

Además, la solución debe ser homogenea, esto es, todos los solutos se encuentran completamente disueltos en el solvente. Una bebida comercial a la que se le encuentren partículas no genera confianza y puede ser rechazada por parte del consumidos.

Answer:

99758 meters

Explanation: 1 mile=1609 meters. Just multiply 62 with 1609. Let me know if you want a conversion sheet.

The reaction between the t-amyl alcohol to t-amyl chloride can be performed without using HCl. The SN1 mechanism needs to be present to affect the transformation of the alcohol to the chloride.

Hydrogen chloride (HCl), a gas at standard pressure and temperature, is a compound of the elements hydrogen and chlorine. Hydrochloric acid is the name for the gas's water solution.

Chlorides are created when active metals and their oxides, hydroxides, and carbonates react with gaseous hydrogen chloride.

Only in the presence of moisture do these reactions happen easily. Hydrogen chloride that has never been wet is very inert.

The reactions of hydrochloric acid are those of conventional strong acids, including those with metals in which hydrogen gas is displaced, reactions with basic (metal) oxides and hydroxides that are neutralized by the creation of a metal chloride and water, and reactions with weak acid salts in which the weak acid is expelled.

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Answer:

They are Weaker than a chemical

corrected by the one in the comment section

The balanced version of the half-reaction that occurs in acidic solution for the reduction of NO3 to NO2 is:

NO3^-(aq) + 2H^+(aq) + 2e^- → NO2(g) + H2O(l)

In this reaction, NO3^- is reduced to NO2, and electrons (e^-) are gained. To balance the equation, we need to ensure that the number of atoms and charges are equal on both sides.

To balance the oxygen atoms, we add water (H2O) on the right side:

NO3^-(aq) + 2H^+(aq) + 2e^- → NO2(g) + H2O(l)

Next, we balance the hydrogen atoms by adding protons (H^+) to the left side:

NO3^-(aq) + 2H^+(aq) + 2e^- → NO2(g) + H2O(l)

Finally, we balance the charges by adding electrons (e^-) to the left side:

NO3^-(aq) + 2H^+(aq) + 2e^- → NO2(g) + H2O(l)

Now, the equation is balanced, with an equal number of atoms and charges on both sides. Therefore, the balanced version of the half-reaction for the reduction of NO3 to NO2 in acidic solution is given by the equation above.

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Answer:

I will assume that the moles are all mistyped and will change them to:

4.64, 25.9, and 2.73.

15.2 liters

Explanation:

Both situations can be described using the ideal gas law:  

PV=nRT,

where P, V, and T are the pressure, volume, and temperature (in degrees K).  n is the number of moles.  R is the gas constant.

First NO2 :      P1(25.9L) = (4.64moles)RT

Second NO2: P2V2 = (2.73moles)RT2

Divide one equation by the other:

(P1(25.9L)  =  (4.64)RT1)      

  P2V2 = (2.73)RT2          

The temperatures, pressures, and gas constants are unchanged, so we can cancel those to obtain:

(25.9L)/V2 = (4.64/2.73)

V2 = (25.9L)(2.73/4.64)

V2 = 15.2 Liters

The abundance of  Rb85 isotope is approximately 72.17%, and the abundance of Rb87 is approximately 27.83%.

To determine the abundance of each isotope of rubidium, we can use the atomic masses of the isotopes and the concept of average atomic mass.

The average atomic mass is the weighted average of the masses of all the naturally occurring isotopes of an element, taking into account their respective abundances.

Let's assume the abundance of Rb85 is x, and the abundance of Rb87 is (1 - x) since the total abundance should add up to 100%.

Using the given atomic masses:

(84.9118 u)(x) + (86.9092 u)(1 - x) = average atomic mass of rubidium

The average atomic mass of rubidium is typically reported as 85.4678 u, which is the weighted average of the isotopic masses. Now we can solve for x:

(84.9118 u)(x) + (86.9092 u)(1 - x) = 85.4678 u

Simplifying the equation:

84.9118x + 86.9092 - 86.9092x = 85.4678

84.9118x - 86.9092x = 85.4678 - 86.9092

-1.9974x = -1.4414

x = -1.4414 / -1.9974

x ≈ 0.7217

Therefore, the abundance of Rb85 is approximately 72.17% (or 0.7217), and the abundance of Rb87 is approximately 27.83% (or 1 - 0.7217).

The abundance of Rb85 in naturally occurring rubidium is approximately 72.17%, while the abundance of Rb87 is approximately 27.83%. These values represent the relative proportions of the isotopes in a given sample of rubidium.

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Answer:

B.) kinetic energy from wind turns blades on wind turbine → wind turbine blades turn generator → generator changes kinetic energy to electricity

Explanation:

correct on edge

just took the quiz

The correct order of steps when using wind to generate electricity is kinetic energy from wind turns blades on wind turbine → wind turbine blades turn generator → generator changes kinetic energy to electricity. Therefore, option B is correct.

The energy an item has as a result of motion is known as kinetic energy. A force must be applied to an item in order to accelerate it. We must put forth effort in order to apply a force.

Kinetic energy has the following formula: K.E. = 1/2 mv², where m is the object's mass and v is its square velocity.

The kinetic energy is measured in kilograms-meters squared per second squared if the mass is measured in kilogrammes and the velocity is measured in metres per second.

The steps when using wind to generate electricity is kinetic energy from wind turns blades on wind turbine → wind turbine blades turn generator → generator changes kinetic energy to electricity.

Thus, option B is correct.

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Answer:

The change from a liquid phase to a gaseous phase occurs when the vapor pressure of the liquid is equal to the atmospheric pressure exerted on the liquid.

Explanation:

Boiling is a physical change and molecules are not chemically altered during the process.

Explanation:

Transpiration is the movement of water through plants using the xylem and also their loss from plants surfaces.

Water is a lost from plants from the leaves and the stomata. This water is usually replaced by the absorption of water by the root.

An example of transpiration when water loses water from their leaves.

Answer:

Explanation:

Your answer is C

Answer:

density= mass/volume

hence density of gold rock

= 386/20

=19.3 g/cc

The phosphate of the incoming ribonucleotide is added to the oxygen on   the fifth carbon.

Genetic material is characteristic information of living things that can be passed on to their offspring. The characteristic information of living things is contained in the cell.

Nucleic acid is the genetic material of the cell nucleus which functions to control cell activity and carry genetic information.  Nucleic acids are nucleotide polymers whose hydrolysis produces phosphates, deoxyribose or ribose pentose sugars, and nitrogenous bases. The pentose sugar that makes up the nucleotide has the form of furanose, the phosphate group is bonded to the 5' carbon of the pentose sugar through an esterification mechanism so that it is called a phosphoester bond, while the heterocyclic nitrogenous bases that make up the nucleotides are purines and pyrimidines.

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Answer:

"The polar regions have long winters and short, cool summers."

Explanation:

Climate is the average of that weather. The climate record also includes extreme values such as record high temperatures or record amounts of rainfall.

For Climate example:

You can expect snow in the Northeast in January or for it to be hot and humid in the Southeast in July.

The ability of glass to behave in some kind of a superplastic manner and to experience extremely large uniform elongations above high temperatures is a feature that makes it possible to produce bottles.

The term "material" describes something that is used to create another item. Cloth or any other item formed of matter that exists throughout the physical world can be referred to as material. As just a noun and also an adjective, "material" has several more meanings.

Metals, polymers, plus ceramics are the three main categories of materials. Steel, fabric, and ceramics are a few examples of them. These classes often have quite distinct origins, traits, and uses.

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A pure material is one that, like water, air, or nitrogen, has a constant chemical makeup throughout.

All elements are mostly pure materials. Some of these are diamond, copper, oxygen, chlorine, and gold. The term "pure substance" also refers to compounds like water, salt crystals, baking soda, and others.

Pure substances include things like water, air, and nitrogen that have a constant chemical makeup throughout. One ingredient or compound does not necessarily make up a pure material.

Tin, sulphur, diamond, water, pure sucrose (sucrose), sodium chloride (table salt), baking soda, and sulphur are examples of pure substances (sodium bicarbonate). Generally speaking, crystals are unpolluted materials. As instances of pure chemical elements, consider tin, sulphur, and diamond. Each and every element is a pure material.

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