calculate the ph of a solution prepared by diluting 3.0 ml of 2.5 m hcl to a final volume of 100 ml with h2o

One mole of the C-C bond can be broken with the provided energy of 348 kJ.

Thus, the amount of energy needed to dissolve one C-C bond is 348 x 1000 / 6.023 x 10^23.

Required energy is 5.78 x 10^-19 Joules.

The relationship between wavelength and energy is

E = hc / λ

where wavelength is λ

Planck's constant is h.

the speed of light, c

5.78 X 10^-19 Joules = 6.62 X 10^-34 X 3 X 10^8 / λ

The highest wavelength of light at which a single photon may break a carbon-carbon single bond is 3.44 X 10-7 m = λ

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When comparing the density of metals to that of liquids, the percentage error is more likely to rise.

A liquid's density is a gauge of how heavy it is relative to the amount being measured. The liquid that weighs heavier is more dense if you weigh two liquids with similar volumes or amounts. A substance less dense than water will float when it is gradually introduced to the water's surface.

The mass to volume ratio of an object determines its density. The unit of density is frequently grams per cubic centimeter (g/cm3). Keep in mind that the volume is measured in cubic centimeters, not grams (the same volume as 1 millilitre).

Direct measurement of a solid's volume is impossible. A solid, especially one with an irregular shape, has a higher potential for measurement error than a liquid.

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Answer:

A scientific problem is often discovered when an observation is made, which leads to a question.

A hypothesis is formed when an explanation is proposed for an observation.

Testing a proposed explanation requires designing an experiment.

For the results of the experiment to be accepted, the experiment must produce the same results when repeated.

An explanation may become a theory if the same results are found after many tests.

Atomic mass refers to an element's average weight, whereas mass number refers to the number of nucleons.

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Calcium oxide is used to remove the pollutant so2 from smokestack gases. the overall reaction is:

CaO(s)+SO2​(g)+ 1/2 O2​(g)CaSO4​(s)

What is calcium oxide?

Calcium oxide (CaO), commonly referred to as quicklime or burnt lime, maybe a  widely used chemical compound.  it's a white, caustic, alkaline, crystalline solid at temperature.

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The change illustrated in the diagram is atoms that formed molecules; option C.

Matter is anything that has mass and occupies space.

Matter can exist as pure or impure substances.

Pure substances are the elements and compounds.

Impure substances are the mixtures.

All forms of matter are composed of atoms.

When atoms of substances combine, the form molecules of the same element or molecules of a compound.

Atoms can also form ions by the loss or gain of electrons.

Therefore, the illustrated diagram shows atoms of the same substance combining to form molecules.

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Answer:

Positive.

Explanation:

The slope is positive and increasing, thus meaning there is a positive correlation between time spent studying each day and performance.

When there is less natural gas, a luminous flame will appear.

A luminous flame is one that produces more light from a fuel source with inefficient combustion. In other words, there is not enough oxygen available for stoichiometric combustion when combustion occurs. For more effective combustion, this emits light that is more in the yellow-orange range of the visible light spectrum as opposed to a more blue-nearly colorless region.

An acetylene torch is a good illustration of luminous falme because the first ignition is normally carried out in the presence of only acetylene, which produces a very sooty, bright, yellowish-red flame. The flame receives more of the necessary oxygen for effective combustion when the oxygen valve is opened, and the flame changes color to blue.

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If the frog cells swell and burst while the human cells shrink means that the solution will be hypotonic for frog cells while for human cells the solution will be hypertonic.

These changes will occur because in the frog cell there will be higher concentrations of ions than in the extracellular space, so water will enter the cell by osmosis to equalize the concentrations of the cells. While in the human cell there will be a lower concentration of ions than outside the cell, for this reason the water leaves it in order to equalize the concentrations both inside and outside the cell. Being then the hypotonic solution for the frog cell and hypertonic for the human cell.

Therefore, we can confirm that if the frog cells swell and burst while the human cells shrink means that the solution will be hypotonic for frog cells while for human cells the solution will be hypertonic.

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Answer:

100/6% =16.67%

Explanation:

16.67%

An endpoint is observed using a phenolphthalein indicator when titrating CH3COOH against NaOH.

Phenolphthalein  is a shorthand notation for the chemical compound C20H14O4, which is frequently written as "HIn," "HPh," "phph," or just "Ph." In acid-base titrations, phenolphthalein is commonly employed as an indicator. It is a member of the group of colors known as phthalein dyes.

For use in studies, phenolphthalein is typically dissolved in alcohols because it is only marginally soluble in water. It is a weak acid that can dissolve and lose H+ ions. The double-deprotonated phenolphthalein ion is fuchsia, whereas the nonionized phenolphthalein molecule is colorless.

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the molar solubility of marble (i.e., [ca2 ][ca2 ] in a saturated solution) in normal rainwater, for which Ph=5.60ph=5.60 is 0.0142.

A saturated solution is a solution that contains maximum amount of solute that can be dissolved under the condition at which the solution exists.

In chemistry, after studying solutions and properties of solution, one can understand that a solution can reach a status of saturation. This state is when solution has reached a point in which no more solute can be added. Addition of solute after this point would result in solid precipitate or gas being released. Such mixture is called a saturated solution.

Ksp of(CaCO3)= 4.5 x 10 -9

Ka1 for (H2CO3) =  4.7 x 10^-7

Ka2 for the (H2CO3) = 5.6 x 10 ^-11

1) The equation 1 for Ksp = 4.5 x 10^-9

CaCO3(s)→ Ca +2(a q)    +  CO3-2(a q)  

2) The equation 2 for Ka1 = 4.7 x 10^-7

H2CO3- + H2O → HCO3- + H3O+

3) equation 3 for Ka2 = 5.6 x 10^-11

HCO3-(a q) + H2O(l) → CO3-2 (a q)  + H3O+(a q)

so, form the equation 1& 2&3 we can get the overall equation:

CaCO3(s)  +  H+(a q)  → Ca2+(a q)   + HCO3-(a q)

note: you could get the overall equation by adding the equation 1 to the inverse of equation 3 as the following:

when inverse of equation 3 is :

CO3-2 (a q) + H3O+ (a q) ↔ HCO3- (a q) + H2O(l)  Ka2^-1 = 1.79 x 10^10

when we add it to the equation 1

CaCO3(s) ↔ Ca2+(a q)  +  CO3-2(a q)   Ksp = 4.5 x 10^-9

∴ overall equation will be as we have mentioned before:

when H3O+ = H+

CaCO3(s) + H+(a q)  ↔ Ca2+ (a q) + HCO3-(a q)   K= 80.55

from overall equation:

∴K = [Ca2+][HCO3-] / [H+]

when we have [Ca2+] = [HCO3-] we can assume both = X

∴K = X^2 / [H+]

when we have the PH = 5.6 we can get [H+]

PH = - ㏒[H+]

5.6 = -㏒[H]

∴[H] = 2.5 x 10^-6

so, by the substitution on K expression:

∴ 80.55 = X^2 / (2.5 x10^-6)

∴X = 0.0142

∴[Ca2+] = X = 0.0142.

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'The detailed study on the failure of the Wedge Calibration Method at Nanonewton Setpoints for Friction Force Microscopy', by the author Ortuso, Roberto Diego and Kaori, Sugihara, published in the journal of physical chemistry C., 2018, vol. 122, no. 21, p. 11464-11474, American Chemical Society (acs) is widely popular calibration technique in friction force microscopy to convert raw lateral laser deflection signals (volt) into the forces (newton).  

There has been recent trends nanotechnologies which demands the use of the method at nanonewton force ranges, but this range is a failure for small forces.  

Conventional Wedge calibration method has been a failure at nanonewton force ranges and studies has been going on to identify the reason behind the failure of this method.

The equation used shows experimental errors by order of magnitude at setpoints due to its mathematical expressions.

This low tolerance against experimental errors in nanonewton force ranges is the reason for failure of wedge calibration method.

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Answer:

Explanation:

Element    #of protons     Mass #.      # of electrons      Atomic #.   Neutron

 Se.               34.                   78.96.                  34                     34           45
             

Si.                 14.                      28.                       14.                   14           14

H.                   1.                       1.                       1                         1               0

Ca.                  20.                 40.078.                20.                  20.              21

Fe.                  26.                  56.                         26.                 26.             30

Na.                  11.                    23.                       11.                    11.                12

Molarity of sucrose = 0.116 M .

Volume of solution = 0.5 liter

Mass of sucrose in gram = 20 gram

Molar mass of sucrose 342.3 g/mol

Molarity of sucrose

Computation:

Mole of sucrose = Mass of sucrose in gram / Molar mass of sucrose

Mole of sucrose = 20 / 342.3

Mole of sucrose = 0.058 (Approx.)

Molarity of sucrose = Mole of sucrose / Volume of solution

Molarity of sucrose = 0.058 / 0.5

Molarity of sucrose = 0.116 M

A substance's molarity (M) is the volume of solution in which it is present. The amount of a solute in moles per liter of a solution is known as molarity. A solution's molar concentration is another name for molarity.

The amount of solute in one mole per liter of solution is known as molarity. For instance, when table salt is dissolved in water, the solute is salt, and the solution is water. 58.44 grams make up one mole of sodium chloride. One molar solution, often known as 1M, is created when 58.44 grams of sodium chloride are dissolved in one liter of water.

The quantity of solute in one mole of solution per liter is known as molarity.

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2.380km= 2e+3m.

A kilometer is a unit of measurement, as is the mille. It additionally translated as 10,000-steps meters, creating a strolling aim that, thru the decades, by some means has become embedded in our global awareness and fitness trackers. however contemporary exceptional science suggests we do now not need to take 10,000 steps an afternoon, which is ready five miles, for the sake of our health or toughness.

The CDC recommends that on foot 10,000 steps a day is sufficient to stay in a suitable form, but the general public needs to hit 20,000 steps as a part of their fitness desires. if you need to try the 20000 steps a day weight reduction, you can expect notable results: decreased belly fat, progressed sleep, boosted immune response, and so on. As excellent as it sounds, taking walks 20000 steps a day of weight loss has its cons. They include emotions of tiredness and starvation, plus it steals a big chew of your day.

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The value of k is 24.44 kPa[tex]m^{3}[/tex] using the given model of pressure and volume .

Given data,

P= 36kPa

V = 0.679[tex]m^{3}[/tex]

According to the given model,

P = k/V

where, P = pressure in kPa

V = volume occupied by gas

k = proportionality constant

Plugging in the values in the respective model we get,

P = k/V

36 = k/0.679

k = 24.44 kPa[tex]m^{3}[/tex]

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The master mix now contains: 0.16 mL of 10 µM ethanol, 0.2 ml of 10 µM NAD, and 0.54 mL buffer. The substrate concentration of the master mix is

a = 0.0016 mM

This is further explained below.

Generally, Ethanol is acting as the substrate for this master mixture.

The following formula is used in order to determine the amount of ethanol that is included in the master mix:

CiVi= CfVf

Ci equals the starting concentration of ethanol, which is equal to 10 muM. 0.16 milliliters is equal to the volume of ethanol that was consumed initially.

Cf = final concentration, often known as the amount of ethanol present in the master mix = a Vf = final volume, which also refers to the final volume of the master mix = 1 milliliter

Introducing the values into the equation:

CiVi= CfVf

10 uM X 0.16 ml = a X 1 ml

a = (10 uM X 0.16 ml ) / 1ml

a = 1.6 uM

a = 1.6/ 1000 mM ... ( 1\muM = 1/1000 mM )

a = 0.0016 mM

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Answer: C. Positive nucleus surrounded by a blob of negative charges

Answer:

the weight

Explanation:

becouse the moon has less mass then earth the gravitational attraction on the Moon is much less than it is on Earth since the moon has less mass this means if you where to go to the moon your mass will stay the same but your weight will change

hope it helps

The form of carbamate mainly used as a herbicide is dithiocarbamate.

The esters of carbamic acid is are known as Carbamate compounds. They are mainly used as  insecticides and referred as N-methylcarbamate. The general formula for  RHNCOOR'. Carbamate compounds are highly soluble in water, polar and are chemically reactive. Carbamates can be easily hydrolyzed, they have low level of persistence in soil as well as water.

Dithiocarbamates are the small group of organic molecules. They have been extensively used in agricultural industry for more than 50 years.  They have strong chelating ability for inorganic species and have anti-oxidant property. Molecular weight of dithiocarbamate is 171.26.

Carbon disulfide with ammonium or either primary/secondary amine gives Dithicarbamates in presence of NaOH or amine. The reaction is an exothermic reaction.

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Answer:

Krypton

Explanation:

They're both inert gases

Answer: When the forces are balanced, neither of the teams, but if the rope moves away in a particular direction or if a team wins, then the forces applied by both teams are unbalanced. Practically anything that moves is a result of the exertion of unbalanced forces on it.

Explanation:

The balanced or unbalanced forces are related to rotational motion by the occurrence of the constant and altered changes in the speed of the object.

Rotational motion may be defined as a type of motion that involves the movement of an object along an axis in a circular path with a common angular velocity.

Balanced forces maintain the state of an object at a constant speed. It means that its velocity remains unchanged during the course of the time interval. While unbalanced forces stimulate the alteration in the velocity of an object. It either reduces or enhances the initial speed of an object.

Therefore, the balanced or unbalanced forces are related to rotational motion by the occurrence of the constant and altered changes in the speed of the object.

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The partial pressure of CO₂ which will give a solubility of 0.080 m is 0.93 atm, at a particular temperature.

Using Henry's Law,

Henry's law states that, solubility of a gas in a liquid is directly proportional to the partial pressure of gas and mole fraction of gas is proportional to partial pressure of the gas.

It is expressed as -

Sgas = Kh Pgas

where,

Sgas = Solubility of

Kh = Henry's law constant

Pgas = Partial pressure of gas

Putting the values in the above expression,

Sgas = Kh Pgas

0.13 M = Kh x  1.5 atm

Kh = 0.13 M

         1.5 atm

Kh = 0.086

For partial pressure,

Sgas = Kh Pgas

0.080 M  = 0.086 x Pgas

Pgas = 0.080 = 0.93 atm

            0.086

Partial pressure of CO₂ is 0.93 atm

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Taking into account the definition of Avogadro's Number, 0.02341 moles of carbon are 1.41×10²² atoms of carbon.

Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

You can apply the following rule of three: if 6.023×10²³ atoms are contained in 1 mole of carbon, then 1.41×10²² atoms are contained in how many moles of carbon?

amount of moles of carbon= (1.41×10²² atoms × 1 mole)÷ 6.023×10²³ atoms

amount of moles of carbon= 0.02341 moles

Finally, 0.02341 moles of carbon are 1.41×10²² atoms of carbon.

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Final temp = 108.05.

What is the boiling point of the automobile radiator fluid prepared by mixing 1.09 l of ethylene glycol (hoch2ch2oh, density = 1.114 g/ml) with 1.16 l of water (density = 1.000 g/ml)?

Delta T = 1*.52*1000*1.114*1000/1160*62

           =8.05 deg C

final temp = 108.05

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The answer would be for this question will be hyperpolarize; the driving force for potassium to exit the cell increases.

The resting potential of a neuron that is submerged in a solution with zero extracellular potassium will hyperpolarize because the driving force for potassium to exit the cell increases.

Hyperpolarization is the process in which the membrane potential looks good on more negative at a specific spot on the neuron's membrane where as depolarization is when the membrane potential became less negative.

At this point at which the neuron is hyperpolarized, in the middle of –70 mV and –75 mV. After hyperpolarization the potassium passage encloses and the natural permeability of the neuron to sodium and potassium permits the neuron to come back to its recline potential of –70 mV.

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The shell is spherically symmetrical orbital and two electrons are found in the N shell of the atom.

The electron configuration is defined as the manner in which the electrons are arranged in an atom. The electron present in an atom are arranged in subshells and shells. The shells are choose according to the principal quantum number in which the subshells are taken by the orbital quantum number.

The orbital in which the electron is found has a direct relation to the energy of the electron.

Thus, we concluded that the "4s^2" refers that it is spherically symmetrical orbital and the two electrons are found in the N shell of the atom.

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Destabilization that occurs in a molecule when two non bonded atoms are too close together is called Van der Waals repulsion.

When two non bonded atoms come close together then in such situation there are two types of forces that come into play.

First one is Van der Waal attractive forces and the second one is van der Waal repulsion forces.

Van der Waal attractive forces are the forces of attraction between the electronic cloud of one atom/molecule with the nucleus of the other atom/molecule and van der Waal repulsive forces are the force of repulsion between the electronic cloud of the both the atoms/molecules and the repulsion between the nucleus of both the atoms/molecules.

Attractive forces causes stabilization whereas repulsive forces causes destabilization.

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Answer:

Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface.

Explanation: