What is the poh in a solution if the [oh-] = 5.42 x 10-5 m?

a
5.26

b
7.26

c
4.26

d
6.26

Answer:

Explanation:

own definitions for the words definite and occupy.

Example sentence

Solid is the state of matter that has a definite shape and volume.

definite:

__________

Example sentence

A larger container will allow a gas to occupy more space.

occupy:

Answer:

Approximately [tex]0.639\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex].

Explanation:

Look up the specific heat of water:

[tex]c(\text{water}) = 4.18\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex].

It is given that the mass of the water in this calorimeter is:

[tex]m(\text{water}) = 130.0\; {\rm g}[/tex],

The temperature of the water in this calorimeter has increased by:

[tex]\Delta T(\text{water}) = (31.0 - 25.5)\; {\rm K} = 5.5\; {\rm K}[/tex].

Thus, the energy that the water in this calorimeter absorbed would be:

[tex]\begin{aligned}& Q(\text{water})\\ =\; & c(\text{water}) \, m(\text{water}) \, \Delta T(\text{water}) \end{aligned}[/tex].

Let [tex]c(\text{metal})[/tex] denote the specific heat capacity of this piece of metal.

The mass of this piece of metal is:

[tex]m(\text{metal})[/tex].

The temperature of this piece of metal has been reduced by:

[tex]\Delta T(\text{metal}) = (96.0 - 25.5)\; {\rm K} = 70.5\; {\rm K}[/tex].

As this piece of metal cooled down, the energy it released would be:

[tex]\begin{aligned}& Q(\text{metal})\\ =\; & c(\text{metal}) \, m(\text{metal}) \, \Delta T(\text{metal})\end{aligned}[/tex].

Assuming that there is no exchange of energy between contents of this calorimeter and surroundings. By the law of conservation of energy, energy could neither be created nor destroyed.

Since energy could not be destroyed, the water in this calorimeter need to absorb the entirety of the energy that this piece of metal released. At the same, since no energy isn't created, the energy that the water absorbed would need to entirely come from this piece of metal. Therefore:

[tex]Q(\text{metal}) = Q(\text{water})[/tex].

[tex]\begin{aligned}& c(\text{water})\, m(\text{water})\, \Delta T(\text{water}) \\&= c(\text{metal})\, m(\text{metal})\, \Delta T(\text{metal}) \end{aligned}[/tex].

Rearrange and solve this equation for [tex]c(\text{metal})[/tex]:

[tex]\begin{aligned}& c(\text{metal}) \\=\; & \frac{c(\text{water}) \, m(\text{water})\, \Delta T(\text{water})}{m(\text{metal})\, \Delta T(\text{metal})} \\ =\; & \frac{4.18\; {\rm J \cdot g^{-1} \cdot K^{-1}} \times 130.0\; {\rm g} \times (31.0 - 25.5)\; {\rm K}}{72.0\; {\rm g} \times (96.0 - 25.5)\; {\rm K}} \\ \approx\; & 0.639\; {\rm J \cdot g^{-1}\cdot K^{-1}}\end{aligned}[/tex].

Answer:

Explanation:

Process of desalination is used to remove salt from seawater for provision of fresh water

Answer:

siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz

Explanation:

Q.A police siren passes you with a frequency of 5000 Hz. Which correctly describes the sound wave after the police car passes you? The speed of sound is 340 m/s.

(a) siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz

(using doppler's effect)

Doppler effect is the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer, caused by the relative motion of the observer and the wave source.

Christian Johann Doppler, an Austrian mathematician, and physicist discovered the Doppler effect in 1842.

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Based on their pOH values, the difference in [OH– ] concentration between point A and point B is 10^6.

The pH is determined by the concentration of Hydrogen ions [H+]. The higher the concentration of H+ ions, the lower the pH of a substance. If the concentration of H+ is greater than OH-, the material is acidic, i.e. the pH value is less than 7

In this case, the formula for this will be:

[tex]pH= -log[H+][/tex]

So we have:

[tex][OH]= 14-1= 10^{-13}\\[OH] = 14-7=10^{-7}[/tex]

Therefore, the difference in [OH– ] concentration between point A and point B is 10^6.

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Answer: 10^6

Explanation: edge2023

Answer:-102

Explanation:The equation shows that 1 mole of H-H bonds and 1 mole of Br/Br vines are broken from 2 miles of H-Br bonds

Answer: -102

Explanation:

Answer:

H20 +

Explanation:

The ion that is formed when the positive hydrogen ions from an acid bond to water molecules is H₂O⁺. The correct option is C.

Hydrogen is an element that is present in the first place on the periodic table, and its atom's number is 1. The nucleus of hydrogen contains only one electron, and it contains a positive 1 charge.

Hydrogen is called hydrogen ion when it participates in any chemical reactions. They become charged and participate in electron bonding to form compounds.

The positive Hydrogen ions, when forming a bond to water molecules, will be represented as H₂O⁺ because hydrogen only contains a positive charge on it. The unit positive charge on the hydrogen is the proton present in its nucleus.

Thus, the correct option is C. H₂O⁺

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Answer:

3.96×10^−22J

Explanation:

First find the frequency of the photon from the equation

c=fλ

∴f=c/λ

=3×10⁸m/s / 0.050×10^−2m

=6×10¹¹Hz.

Energy of such photons is quantized and given by

E=hf

=(6.6×10^−34)(6×10¹¹)

=3.96×10^−22J

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The energy of photon is 3.96×10⁻²²J.

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave

There is a relation between energy of wave. frequency of wave, and wavelength of wave

Mathematically,

E=hc/λ

where,

E = energy of electromagnetic wave

h is planks constant having value 6.67×10⁻³⁴js

c is speed of light that is 3×10⁸m/s

λ is the wavelength of electromagnetic wave

frequency=speed of light/wavelength

                =3×10⁸m/s / 0.050×10⁻²m

                 =6×10¹¹Hz.

E=h×frequency

  =(6.6×10⁻³⁴)(6×10¹¹)

  =3.96×10⁻²²J

Therefore, the energy of photon is 3.96×10⁻²²J.

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The iron filings react with copper sulfate, the copper is displaced and iron sulfate results.

The reaction between iron filings and copper sulfate is represented by the equation below:

[tex]Fe + CuSO_4--- > FeSO_4 + Cu[/tex]

The iron filings displace the copper from copper sulfate to form iron sulfate.  Thus, elemental copper and iron sulfate are formed.

Iron is able to displace copper from copper sulfate because iron ranks higher than copper in the reactivity series.

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Answer:The temperature of the water in both beakers is greater than 8 °C. in beaker B

Explanation:

The table should be included, but that's okay

hcl naoh: salt neutral (both strong)

hcl nh4oh: salt acidic(strong acid+weak base)

ch3cooh koh: salt basic(weak acid+strong base)

Answer:

Polymerization, any process in which relatively small molecules, called monomers, combine chemically to produce a very large chain-like or network molecule, called a polymer. The monomer molecules may be all alike, or they may represent two, three, or more different compounds.

Explanation:

:^)

Answer:

in a solution of salt in water, the solute is salt, and solvent is water.

Explanation:

C) salt is the solute, water is the solvent.

Answer:

C

Explanation:

:)

Explanation:

is equal to the mass of the original elements

Answer:

22 and 24

Explanation:

neutron i is bigger thañ protons

Answer:

the phenotype of TT is the right answer

Answer:

deferent elements

Explanation:

because 11n 12 is not the same as well as13

Answer: They are the same elements

Explanation:

They're same elements because the number of electrons are same (number of protons=electrons).

The number neutrons don't matter.

If any two atoms have the same number of Electrons and protons and has different number of neutron's they still are the same element.

Answer:

d) 6.0 moles

Explanation:

M = moles of solute/liters of solution

3 0M = x/2.0

2.0L×3 0M = x/2.0L×2.0L

6.0 moles = x

Hess’s Law describes how the heat energy of a reaction consists of the total of the energy changes of the individual step reactions.

Hess's law of constant heat summation states that the total heat changes that occur in a reaction is independent of the several intermediate pathways of the reaction, but is a sum of all the heat changes that occur.

Hess’s Law describes how the heat energy of a reaction consists of the total of the energy changes of the individual step reactions.

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Answer:

False; the correct atomic number for lithuim is 3

Explanation:

Answer to back it up

~rere

The original amount of a radioactive sample should be multiplied by (one half) superscript n to calculate the amount remaining.

This is the time taken for half a substance to decay.

The number of half-lives a substance has undergone is related to its original amount as and amount remaining according to the following equation:

N = N₀ × (½)ⁿ

Where

From the above equation, we can conclude that the original amount of a radioactive sample should be multiplied by (one half) superscript n

to calculate the amount remaining.

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Answer:

c. (1/2)^n

Explanation:

Answer:

Mitosis

Explanation:

you scrape your knee and the skin repairs itself

65 grams of oxygen is approximately equal to 2.03125 moles.

To convert 65 grams of oxygen to moles, we need to use the molar mass of oxygen (O₂), which is approximately 32.00 g/mol. Oxygen exists as a diatomic molecule (O₂), so we use the molar mass of O₂ to convert from grams to moles.

The formula for converting grams to moles is:

Moles = Mass (in grams) / Molar mass (in grams per mole)

Given:

Mass of oxygen = 65 grams

Molar mass of oxygen (O₂) = 32.00 g/mol

Moles of oxygen = 65 grams / 32.00 g/mol

Moles of oxygen ≈ 2.03125 moles

Therefore, 65 grams of oxygen is approximately equal to 2.03125 moles.

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Solid-

liquid-

Gas-

Plasma-

Answer:

1.1 M

Explanation:

The formula mass of sodium hydrogen carbonate is about 23+1+12+3(16)=84 g/mol, so 96 g is about 1.142 mol.

molarity = (moles of solute)/(liters of solution) = 1.1 M

The replacing of house lights with lower-watt bulbs represents energy conservation not energy sustainability because energy conservation is the efficient use of energy without wasting it.

Energy conservations refer to the practice of using less energy for doing various activities. Turning off the light when you leave the room is the example of energy conservation.

So we can conclude that replacing of house lights with lower-watt bulbs represents energy conservation not energy sustainability because energy conservation is the efficient use of energy without wasting it.

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Answer:

one advantage: no air pollutants, one disadvantage: gives off radioactive waste