The hydronium ion concentration in an aqueous solution at 25oC is 6.1 x 10-2M. What is the pH of this solution?
a. 1.21 b. 12.79 c. 8.21 d. 7.90 e. 11.20

Answer:hydrogen gas is allowed to permeate through a thin plastic membrane that is 109 microns thick. concentrations of 0.025 moles/m3 and 0.0025 moles/m3 are maintained on the high and low pressure sides of the membrane, respectively. if the diffusivity of hydrogen gas molecules in the plastic is 4.1x10-8 m2/s, how many moles of hydrogen gas pass through a 4.0 square meter area of the plastic membrane every hour?

Explanation:

hope this helps have a great day

Answer:

yes

Explanation:

it change everything

im pretty sure the awnser is yes

Answer: (B) −198 kJ.

To find out how many meters the skydiver fell, you can use the formula:

distance = speed x time

distance = 10 m/s x 15 seconds

distance = 150 meters

Therefore, the skydiver fell 150 meters during his 15-second fall.

Speed is a scalar quantity that describes how fast an object is moving. It is typically measured in units of distance per time, such as meters per second (m/s) or kilometers per hour (km/h).

Speed is different from velocity, which is also a measure of an object's movement, but velocity is a vector quantity and it describes an object's speed in a certain direction. Speed is the magnitude of velocity and it's a scalar quantity which only describes how fast an object is moving without considering direction. The formula for speed is distance traveled divided by the time it takes to travel that distance.

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Answer: The answer is 4.5e+27 grams, I hope I helped!

Explanation: N/A (I threw away my paper ^^")

The rate of reaction is given by rate = k [CH3COOC2H5] [C4H9OH], where k is the rate constant. From the given data, the forward reaction rate constant, k = 9 x 10-5 dm3 mol-1 s-1. The equilibrium constant, Kc = 1.08.

At equilibrium, the rate of forward reaction equals the rate of backward reaction. So, Kc = [CH3COOC4H9] [C2H5OH] / [CH3COOC2H5] [C4H9OH] At equilibrium, we have [CH3COOC4H9] [C2H5OH] / [CH3COOC2H5] [C4H9OH] = 1.08 ... equation (1)

The plot of the concentration of butanol and butyl acetate as a function of time is given in the following graph: \(y=1.545x^{2}-279.29x+14411\)\(z=400-0.625x\)The unit of y is mol/dm3 and x is seconds. The unit of z is dm3. (b)The maximum concentration of butyl acetate is reached when the concentration of butanol is zero.

Therefore, the total reactor volume to maximize the concentration of butyl acetate and avoid overflowing the vessel is 279 dm3 (approx).

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Answer: C(Elevation of surface features)

Explanation: It's a topographical Map which displays lines of Equal Elevation.

To change the vapor pressure to 752 mmHg, 27.8 g of sucrose (C12H22O11) must be added to 500 g of water at 100C.

Vapor pressure of a solution is affected by the presence of solutes in the solution. The relationship between vapor pressure lowering and concentration of a non-volatile solute in a solvent is described by Raoult's law.

It states that the vapor pressure of a solution is equal to the mole fraction of the solvent multiplied by the vapor pressure of the pure solvent, P₀. Hence, Pᵥ = P₀ x Xw

where, Pᵥ = vapor pressure of the solution Xw = mole fraction of the solvent P₀ = vapor pressure of the pure solvent

Therefore, P₀ - Pᵥ = P₀ x (1 - Xw)

This equation can be used to calculate the vapor pressure lowering of a solution relative to the pure solvent. By definition, the mole fraction of the solvent is given by

Xw = number of moles of solvent / total number of moles of solute and solvent.

Since we assume that the volume of the solution is 500 g of water + m g of sucrose, where m is the mass of sucrose, we can write

0.752 atm x 760 mmHg / atm = P₀ x (500 g / (500 g + m))

m= 27.8g

Therefore, we have m = 27.8 g of sucrose.

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A conjugate acid-base pair is the pair of two compounds which differ by the presence of a proton. An acid will donate protons to a base and become a conjugate base. A base will accept protons and become a conjugate acid.Conjugate acid/base pairs are as follows:H2PO4− and HPO42−H2CO3 and CO32−HCl and Cl−H3O+ and OH−Explanation:

H2PO4− and HPO42−H2PO4− can donate a proton to become HPO42− and the latter can accept a proton to become H2PO4−.H2CO3 and CO32−H2CO3 can donate a proton to become CO32− and the latter can accept a proton to become H2CO3.HCl and Cl−HCl can donate a proton to become Cl− and the latter can accept a proton to become HCl.H3O+ and OH−H3O+ can donate a proton to become OH− and the latter can accept a proton to become H3O+.Therefore, the following are conjugate acid/base pairs:H2PO4− and HPO42−H2CO3 and CO32−HCl and Cl−H3O+ and OH−

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By exchanging electrons with one another, atoms create new materials. When two atoms share at least one pair of electrons, this is known as a covalent link. Ionic bonds form when positive  are attracted to one another and share an electron as a consequence.

When two atoms share , they establish a  connection. Because the two positively charged atomic nuclei and shared, negatively charged electrons in a covalent bond are attracted to one another by electrostatic forces, the bond is stable.

One or more pairs of electrons from each atom are shared by the other atoms to form a covalent link. The two atomic nuclei are pulling these electrons in opposite directions. When the gap between two atoms' electronegativities is too narrow for an electron transfer to take place and form ions, a covalent bond is created.

Reactants interact with one another in a chemical reaction, breaking the bonds that hold their atoms together.

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Answer:

Here's your answer on the Image!

Explanation:

I took the K-12 Quiz

Answer:

The answer is E) none of the above.

In all of the given reactions, mass and charge are conserved. The law of conservation of mass states that the mass of reactants must be equal to the mass of the products in a chemical reaction. The law of conservation of charge states that the total charge of the reactants must be equal to the total charge of the products.

In reaction A, the water molecule dissociates into a hydrogen ion (H+) and a hydroxide ion (OH-), but the total mass and charge are still conserved.

In reaction B, the reduction of CIO2 to Cl- is balanced by the oxidation of water to form OH-. The electrons and charge are conserved.

In reaction C, H2SO4 reacts with NaOH to form Na2SO4, H+ and OH-. The mass and charge are conserved.

In reaction D, ZnCl reacts with water to form ZnOH, H+ and Cl-. The mass and charge are also conserved.

1000 grams of nitroglycerin 2% ointment should be mixed with the ointment base to obtain 100 grams of an ointment with a concentration of 0.2%.

To determine the amount of nitroglycerin 2% ointment needed to mix with an ointment base to obtain 100 grams of an ointment with a concentration of 0.2%, we can use the concept of a proportion.

Let's set up the proportion:

(grams of nitroglycerin 2% ointment) / 2% = 100 grams / 0.2%

To solve for the grams of nitroglycerin 2% ointment, we can cross-multiply and then divide:

(grams of nitroglycerin 2% ointment) = (2% / 0.2%) * 100 grams

Calculating the right side of the equation:

(grams of nitroglycerin 2% ointment) = (2 / 0.2) * 100 grams

                                = 10 * 100 grams

                                = 1000 grams

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Answer:

volume is 78.651685393258 cm^3 or about 78.7 cm^3

Explanation:

Answer:

0.013g/cm3

Explanation:

d=m/v and we are looking for the volume so you multiply density by mass to get the volump

Explanation:

First, we need to rewrite the equation:

2K + 2H2O -> 2KOH + H2

This equation tells us that 2 moles of K react with 2 moles of H2O and produce 2 moles of KOH and 1 mole of H2.

If we have 43.7 grams of potassium, we can transform it into moles, compare with the ratio between Potassium and Hydrogen (H2) and then, calculate the quantity of hydrogen in grams.

So first, let's transform 43.7 grams of K into moles using the following formula:

moles = mass/molar mass

molar mass of K = 39.10 g/mol

moles = 43.7/39.10

moles = 1.12 moles

So:

2 moles of K --- 1 moles of H2

1.12 moles of K --- x moles of H2

2x = 1.12

x = 1.12/2

x = 0.559 moles of H2

Now let's transform moles into grams using the following formula:

mass = moles x molar mass

molar mass of H2 = 2.02 g/mol

mass = 0.559 x 2.02

mass = 1.13 g

Answer: It is produced 1.13 grams of H2.

The theory of traits of a population change over time explains how people can change with respect to the  strength and intensity of basic trait dimensions.

Trait theory in psychology serves as the thorry that focus on the  idea that people differ  whichg can be attributed to their strength  as well as  intensity of basic trait dimensions.

It shouuld be noted that the criteria that characterize personality traits involves the act of consistency as well as  stability,  along with  individual differences.  Natural selection  give us the underswtandng of how genetic traits of a species undergo change over time.

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CH2Cl2 has both dipole-dipole interactions and London dispersion forces as its intermolecular forces.

In CH2Cl2 (dichloromethane), the types of intermolecular forces present are:
1. Dipole-dipole interactions: These occur between polar molecules, like CH2Cl2, which have a positive and a negative end (dipole). In CH2Cl2, the electronegative chlorine atoms pull electron density away from the carbon and hydrogen atoms, creating a dipole moment.
2. London dispersion forces: These are temporary, weak attractive forces that occur between all molecules, including nonpolar ones. They arise due to random fluctuations in the electron distribution, leading to temporary dipoles.
In summary, CH2Cl2 has both dipole-dipole interactions and London dispersion forces as its intermolecular forces. These forces are generally weaker than the covalent bonds within the CH2Cl2 molecules themselves.

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Answers:

13) 3.9

14) 12000

15) 6800

16) 110

17) 0.00049

18) 120

Explanation:

Rules to round numbers to two significant figures:

First we will look at the second digit of given values.

we will draw a line after second digit then we will look the digit after line.

It the digit after line which is 3rd digit is 5 or more than 5 then one will be added to the second digit.

It it is less than five then second digit remain same.

After this we will add zeros to the right till decimal point.

13) 3.948

Round to two significant figures = 3.9

14) 11561.06

Round to two significant figures = 12000

15) 6789.2

Round to two significant figures =  6800

16) 112.6

Round to two significant figures = 110

17) 0.00048888

Round to two significant figures = 0.00049

18) 119.999

Round to two significant figures =  120

The third container have the lowest rate of vaporization.

The container with the highest rate of vaporization would be the one that holds the solution with the lowest boiling point, because the boiling point is directly related to the vapor pressure of a substance. The lower the boiling point of a substance, the higher the vapor pressure, and the higher the rate of vaporization.

The boiling point of a substance can be lowered by adding a non-volatile solute, which decreases the vapor pressure of the solvent. Since the solutions in the containers are at 20oC, the rate of vaporization of a solution will be determined by the vapor pressure of the solvent.

The rate of vaporization would be highest for the container that holds the solution with the lowest vapor pressure (highest boiling point). So, the container with water would have the lowest rate of vaporization because it has the highest boiling point, hence the lowest vapor pressure.

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The hydrogen-oxygen bond is ionic 3 because to the difference in electronegativity.

The capacity of such an atom to draw protons (or electronic structure) to itself is measured by its electropositive. It controls the distribution of the shared energy between two molecules in a bond. The bigger an atom's electropositive, the more aggressively it will draw electrons from its bonds.

The capacity of an element to draw electron density in a covalent connection is referred to as electron affinity. The stronger a material attracts other shared electrons, the greater its degree of electronegativity.

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The states of matter of the materials;

1) Dispersion forces - Yes

2) Hydrogen bonding - No

3) Ionic - No

4) Dispersion forces - No

5)  Dispersion forces - Yes

6) Ionic  - No

7) Hydrogen bonding - No

Sublimation is a physical process in which a substance transitions directly from its solid phase to its gaseous phase without passing through the intermediate liquid phase. In sublimation, the solid substance is heated, and the resulting gas molecules escape from the solid lattice structure without the need for melting.

One common example of sublimation is the process of dry ice. Dry ice is solid carbon dioxide (CO2) that sublimes at a temperature of -78.5 degrees Celsius (-109.3 degrees Fahrenheit). When dry ice is exposed to room temperature, it transitions directly from a solid to a gas, producing a fog-like effect.

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Answer:

The balanced chemical equation is:

- Ratio of Al2O3 to O2: 2:3R

- Ratio of Al2O3 to Al: 2:4R

- Ratio of Al to O2: 4:3R

Explanation:

To balance the chemical equation, it is necessary to have the same amount of elements on the reactant side as on the product side:

Now we know that the reaction is balanced, because on the reactant side and on the products side there are:

- 4 Al

- 6 O

Now that the equation is balanced, we can write the ratios with the stoichiometry of the reaction.

Answer:

here's your answer...

Explanation:

Full moon, also hey lol.

have a germ-free day.

Explanation:

it helps to provide the energy which is necessary to hold two different atoms together as part of chemical compound.

Answer:

physical property

Answer:

physical

Explanation:

nothing changed to the material

1) Covering with greases on the iron  stops air and water from being in contact with the iron.

2) The substance that can react with copper to make  copper carbonate is silver carbonate

3) The combustion of lithium produces lithium oxide

4) The table is not shown hence the question can not be answered

5) another metal, oil and grease

6) The chemical reaction creates new substances.

7)  ​​A corrosion reaction is a chemical reaction that happens on the surface of a metal.

8) .In a chemical equation, the reactants and products are different from each other.

9)  ​​As silver reacts with polluted air, a black compound,  silver oxide is formed.

In the process of oxidation, we are just burning up a substance in oxygen. When we burn the substance in oxygen, there is an increase in the oxidation number of the object and oxygen is also added to the object. This is what we call oxidation of a substances.

Now we know that oxygen is abundant in the universe and thus it can be used in the burning of a substances. In effect we can look at the process of combustion as a situation in which we burn an object in air.

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The four mole ratios are: 6 KOH / 2 K₃PO₄, 2 KOH / 1 Co₃(PO₄)₂,

1 K₃PO₄ / 1 Co₃(PO₄)₂, 1 Co(OH)₂ / 2 KOH.

Mole ratio refers to the ratio between the number of moles of two substances in a chemical reaction.

The given chemical equation is:

2 KOH + Co₃(PO₄)₂ → K₃PO₄ + Co(OH)₂

And the first mole ratio given is:

6 KOH / 2 K₃PO₄

To find the other mole ratios, we need to first balance the chemical equation. It is already balanced, so we can proceed to find the other mole ratios:

(2) 2 KOH / 1 Co₃(PO₄)₂

This ratio indicates that two moles of potassium hydroxide react with one mole of cobalt(II) phosphate.

(3) 1 K₃PO₄ / 1 Co₃(PO₄)₂

This ratio indicates that one mole of potassium phosphate is produced for every mole of cobalt(II) phosphate that reacts.

(4) 1 Co(OH)₂ / 2 KOH

This ratio indicates that one mole of cobalt(II) hydroxide is produced for every two moles of potassium hydroxide that react.

Therefore, the four mole ratios are:

(1) 6 KOH / 2 K₃PO₄

(2) 2 KOH / 1 Co₃(PO₄)₂

(3) 1 K₃PO4 / 1 Co₃(PO₄)₂

(4) 1 Co(OH)₂ / 2 KOH

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Correct question is:

KOH + Co₃(PO₄)₂ →

With the above balanced equation, make atleast four mole ratios ( one is done for you ):

\(\frac{6KOH}{2K3PO4}\)    -      -        -

The maximum volume of carbon dioxide that can be formed at RTP would be 0.48 L.

Sodium carbonate reacts with hydrochloric acid according to the following balanced equation:

\(Na_2CO_3 + 2HCl -- > 2NaCl + H_2O + CO_2\)

The mole ratio of the sodium carbonate that reacts to the carbon dioxide that is produced is 1:1. Thus 0.020 mol of sodium carbonate will be equivalent to 0.020 mol of carbon dioxide.

At room temperature and pressure (RTP), 1 mole of gas is equivalent to 24 L of gas.

Thus, 0.020 mol carbon dioxide would be equivalent to:

0.020 x 24 = 0.48 L

In other words, the maximum volume of carbon dioxide that can be produced from the reaction at RTP is 0.48 L.

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