What mass of cu(s)cu(s) is electroplated by running 14. 5 aa of current through a cu2 (aq)cu2 (aq) solution for 4. 00 hh?

A buffer solution contains an equivalent amount of acid and base. The pH of the solution with an acid dissociation constant (pKa) value of 3.75 is 3.82.

The amount of hydrogen or the proton ion in the solution is expressed by the pH. It is given by the sum of pKa and the log of the concentration of acid and bases.

Given,

Concentration of salt [HCOO⁻] = 0.24 M

Concentration of acid [HCOOH] = 0.20 M

The acid dissociation constant (pKa) = 3.75

pH is calculated from the Hendersons equation as,

pH = pKa + log [salt] ÷ [acid]

pH = 3.75 + log [0.24] ÷ [0.20]

= 3.75 + log (1.2)

= 3.75 + 0.079

= 3.82

Therefore, 3.82 is the pH of the buffer.

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The molecular formula of the given compound is [tex]$\mathrm{H}_{2} \mathrm{CO}_{3}$[/tex] also known as  Carbonic acid.

The simplest whole-number ratio of the various atoms in a compound is represented by an empirical formula.

The precise number of various atom types present in a compound's molecule is indicated by the molecular formula.

Given that,

H = 3.3%

C = 19.3%

O = 77.4%

No. of moles of H = 3.3/1

No. of moles of H = 3.3

No. of moles of C = 19.3 / 12

No. of moles of C = 1.60

No. of moles of O = 77.4/16

No. of moles of O = 4.83

Therefore, the ratio of the atoms of C, H and O = 3.3 : 1.60 : 4.83

Divide by smallest value which you get =3.3 / 1.60 : 1.60 / 1.60 : 4.83 / 1.60

The ratio of the atoms of C, H and O = 2 : 1 : 3

So, the empirical formula is [tex]$\mathrm{H}_{2} \mathrm{CO}_{2}$[/tex]

Let the molecular formula is [tex]$\left(\mathrm{H}_{2} \mathrm{CO}_{3}\right) \mathrm{n}$[/tex]

Then, molar mass [tex]$=(2 \times 1+1 \times 12+3 \times 16) n\\[/tex]

Molar mass = 62n

As the question, 62 n = 60

n = 0.96 or n = 1 (rounded off to nearest ones)

So, the molecular formula is [tex]$\left(\mathrm{H}_{2} \mathrm{CO}_{3}\right) 1=\mathrm{H}_{2} \mathrm{CO}_{3}$[/tex] i.e., the compound is Carbonic acid.

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Magnesium is a metal that reacts quickly. Magnesium chloride or hydrogen gas will be produced during the reaction with hydrochloric acid. Following will happen as a result: Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g).

The equation for how magnesium interacts with hydrochloric acid reads: Mg(s)+2 HCl(aq) = MgCl2(aq)+H (g) This experiment can be used to demonstrate the production of hydrogen gas, a single displacement reaction, or even the typical reaction for metals with acid.

Because energy was released into the environment when magnesium or oxygen particle collide to create new bonds, burning magnesium is indeed an exothermic reaction. Baking soda and citric acid react endothermically when the temperature drops. As the temperature rises, magnesium or hydrochloric acid undergo exothermic reactions.

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Answer:

from 10-14

Explanation:

the pH of potassium hydroxide is extremely high and is a strong base although the exact value depends on the concentration of the base in water.

There are  0.138 gram  copper could be electroplated on the cathode in an experiment where an average of 200 ma was passed through the cell for 35 minutes .

Calculation ,

Given ; Current passed through copper ( I ) = 200 mA =  200×[tex]10^{-3}[/tex] A

time in second = 35 minutes×60 = 2100 sec

Current ( I )= Q/t

Q =It =  200×[tex]10^{-3}[/tex] A  × 2100 sec  = 420 C

96500 C of charge =  1 mole

420 C of charge =  1 mole ×420 C/ 96500 C = 0.00435 mol

In  , the valancy of Cu is +2 .

2 moles of electron  are required for the decomposition of 1 mole of Cu on the cathode .

0.00435 mol  of electron  are required for the decomposition of Cu =  1mol × 0.00435 mol/2 = 0.002175 mol of Cu

Number of moles of Cu = given mass / molar mass

Mass of Cu = Number of moles of Cu × molar mass = 0.002175 ×63.546

Mass of Cu = 0.138 gram

Therefore , mass of copper is  0.138 gram

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A student makes up 2 l of a 3. 0 m aqueous solution of HBr. to this solution she adds 1 l of a 4 m NaOH solution, then the pH of the resulting solution is 13.83.

Normality is defined as the ratio of equivalent mass of compound to the volume of solution in litre.

N1 is the normality of HBR = 3m

N2 is the normality of NaOH = 4m

V1 is the volume of the HBr = 2l

V2 is the volume of the NaOH = 1l

V is the total volume of solution = V1 + V2 = 2l +1l

= 3l

Normality of the solution = N

As we know that,

N1V1 - N2V2 = NV

3 × 2 – 4 × 1 = N × 3

6 – 4 = N – 3

N = 2/3 = 0.67 m

(OH-) = N = 0.67 m

Since normality of NaOH is greater than BR . Hence the resulting solution is alkaline.

pOH = -log[OH-]

POH = - log (0.67) = 0.17

As we know that,

PH + pOH = 14

pH = 14 – 0.17

= 13.83

Thus, we calculate that the pH of the resulting solution is 13.83.

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Hydration number is 9

Given:

molar mass of na2so4•nh2o = 304.04 g/mol

To Find:

hydration number 'n'

Solution: hydration number is the number of molecules of water with which an ion can combine in an aqueous solution of given concentration.

Atomic mass of Na = 23g

S = 32g

0 = 16g

H = 1g

Molar mass of the compound is evaluated as:

2(23) +32 + 4(16) + n[2(1) +16] = 304.04

46 +32 +64 +18n = 304.04

142 +18n = 304.04

18n = 304.04 - 142

18n = 162.04

n = 9

So, hydration number is 9

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If it takes 35.04ml of a 0.2455M NaOH solution to neutralize 25. 00ml of an unknown HCl solution, the molarity of the HCl solution is 0.34M.

The molarity of a solution can be calculated using the following formula:

C1V1 = C2V2

Where;

According to this question, it takes 35. 04ml of a 0. 2455M NaOH solution to neutralize 25.00ml of an unknown HCl solution. The molarity of the HCl can be calculated as follows:

35.04 × 0.2455 = 25.0 × V2

8.602 = 25C2

C2 = 8.6/25

C2 = 0.34M

As a result, the molarity of the HCl solution is 0.34M if it takes 35. 04ml of a 0.2455M NaOH solution to neutralize 25ml of an unknown HCl solution.

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Natalie is observing electron cloud model of an atom.

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The pair of reactants which will undergo aldol condensation to produce methyl vinyl ketone is formaldehyde and acetone.

It occurs only with aldehydes but only those aldehydes which are having alpha hydrogen within them because when two different forms of aldehydes react the elimination of waters molecule occurs which needs one alpha hydrogen within it.

CH₂O + CH3COCH3 will give methyl vinyl ketone elimination of water molecule has to be done.

Therefore, the pair of reactants which will undergo aldol condensation

to produce methyl vinyl ketone are formaldehyde and acetone.

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The resistance of the heating element is 21.61 Ω

Given

The power dissipated = 1500 W

Voltage = 180 V

We know that

Power = Voltage * Current

⇒ Power / Voltage = Current

⇒ 1500 W/180 V = Current

⇒ 8.33 A = Current

In order to calculate the resistance of the heating element. We Have to apply the formula

Power = (Current)^2 * Resistance

⇒ Resistance = Power / (Current)^2

⇒ Resistance = 1500 W/ (8.33) ^2

⇒ Resistance = 21.61 Ω

Hence the resistance of the heating element is 21.61 Ω

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The mass of the piece of wood is 35.58 g.

Joule = M × T × C

Where, M = mass

T = change in temperature(42C-23C=19 C)

C = specific heat capacity = 1.716 joules/gram

Substituting the values in the equation,

1160 = M × 19 × 1.716

M = 1160/32.604 = 35.58 g

Therefore, the mass of the piece of wood = 35.58 g

A material's specific heat capacity, which is defined as its heat capacity divided by its mass, determines how much energy is required to increase a gram's temperature by one degree Celsius (or one Kelvin)

Mass is the quantity of matter in a physical body.

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2.3352 g of PbCl₂ are formed when 50. 0 ml of 0. 336 m KCl react with pb(no3)2.

The balanced equation for the above double displacement reaction is as follows;

2KCl + Pb(NO₃)₂ ---> PbCl₂ + 2KNO₃

Stoichiometry of KCl to PbCl₂ is 2:1

This means that 2 mol of KCl would react with every 1 mol of PbCl₂

The molarity of KCl = 0. 336 M

in 1 L of KCl, there are mol

Therefore in  50. 0 ml of KCl, there are=  [tex]\frac{0. 336 * 50}{1000}[/tex]

Number of KCl moles reacted = 0.0168 mol

according to stoichiometry

number of PbCl₂ moles formed =  1/2 x number of KCl moles reacted

Therefore number of PbCl₂ moles formed = 0.0168 mol/2 = 0.0084 mol

molar mass of PbCl₂ = 278 g/mol

mass of PbCl₂ formed = 278 g/mol x 0.0084 mol = 2.3352 g

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Answer:

Carbonyl

Explanation:

While the diagram is slightly unclear, the molecule most likely being shown is a carbonyl. A molecule is a carbonyl when there is a carbon double-bonded to an oxygen.

The conjugate acid is H2SeO4 and the conjugate base pairs in the reaction is H2O.

The full equation of the reaction is

H2SeO4 + H2O----- H3O^+(aq) + HSeO4

Conjugate base are those substance formed when an acid loses a hydrogen ion. Considered a base because it can gain a hydrogen ion to reform the acid.

The conjugate acid is the species that donate a proton to the conjugate base, hence H2SeO4 is the conjugate acid while H2O is the conjugate base because it accepts a proton from H2SeO4.

Thus we concluded that the conjugate acid is H2SeO4 and the conjugate base pairs in the reaction is H2O.

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When comparing the titration curves for the titration of a strong acid with a strong base and the titration of a weak acid with a strong base, pH increases when we reach the equivalent point.

Initially the pH rises little by little. This is because the scale of the pH increases is logarithmic. Then it rises sharply near the equivalent point. At this point the remaining hydronium ions are low, and only a small amount of hydroxide ion is needed to raise the pH.

Weak acid has low pH but second point is firstly the pH rises faster but less quickly when approaching the equivalent point.

The pH produced by titration of weak acid with strong base rises faster at first but less quickly when approaching the equivalent point.

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When an electron passes through the magnetic field of a horseshoe magnet, the electron's direction is changed.

Path of an electron in a magnetic field

The force (F) on wire of length L carrying a current I in a magnetic field of strength B is given by the equation:

F = BIL

But Q = It and since Q = e for an electron and v = L/t you can show that :

Magnetic force on an electron = BIL = B[e/t][vt] = Bev where v is the electron velocity

In a magnetic field the force is always at right angles to the motion of the electron (Fleming's left hand rule) and so the resulting path of the electron is circular.

Therefore :

Magnetic force = Bev = mv2/r = centripetal force

v = [Ber]/m

and so you can see from these equations that as the electron slows down the radius of its orbit decreases.

If the electron enters the field at an angle to the field direction the resulting path of the electron (or indeed any charged particle) will be helical. Such motion occurs above the poles of the Earth where charges particles from the Sun spiral through the Earth's field to produce the aurorae.

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Answer:

18016

Explanation:

(empirical formula)n=molar mass

Answer: C_6 H_12 O_6

Explanation: The molar mass of glucose is given as 180.16 gm/mol.

It is 40% carbon, so the weight of the carbon is 40% of 180.16 =72.06 gm. The molar weight of the carbon is 12.011 gm, so the total number of the moles of carbon are 72.06/12.011 = 6 moles.

It is 6.719% of hydrogen, so the weight of the hydrogen is 6.719% of 180.16 = 12.105 gm. The molar weight of the hydrogen is 1.008 gm, so the total number of the moles of hydrogen are 12.105/1.008 = 12 moles.

It is 53.27% of oxygen, so the weight of the oxygen is 53.27% of 180.16 = 95.97 gm. The molar weight of the oxygen is 16 gm, so the total number of the moles of oxygen are 95.97/16 = 6 moles.

The viscosity of a solution is quadrupled, the rms-average distance of a collection of diffusing molecules from their starting point would be [tex]\frac{1}{2}[/tex] over the same amount of time.

If the viscosity of a solution is quadrupled then the distance of collection of diffusing molecules would be half over the same amount of time. The viscosity of the molecules is dependent on density of the liquid. It is independent to the volume of the liquid.

Viscosity is measure of a fluid's resistance of flow.

The SI unit of viscosity is Poiseuille (PI) is other units ae newton second per square meter or pascal second. The dimensional formula of viscosity is [[tex]ML^{-1}T^{-1}[/tex]].

The viscosity of liquids decreases rapidly with an increase in temperature, and the viscosity of gases increases with an increase in temperature.

η = [tex]\frac{2ga^{2} (Δρ)}{9v}[/tex]

Where (Δρ) is the density difference between fluid and sphere tested, a is the radius of the sphere, g is the acceleration due to gravity and v is the velocity of the sphere.

Viscosity Types:

Viscosity is the measure of fluid's friction to it's flow. There are two ways to measure the fluid is viscosity is follows:

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Since 1750, about 46 percent of CO2 is increased in the atmosphere.

Co2 gas is considered as Greenhouse effect.

Green house effect : The trapping of the sun's warmth in a lower atmosphere of planet, due to the more and more transparency of the atmosphere to visible radiation from the sun than the infrared radiation which are emitted by the surface of the planet.

Due to greenhouse effect the temperature of earth surface increases.

Many reasons for increase in Greenhouse effect are as follow:

Due to these reason the percentage of CO2 in the atmosphere is increased by 46.

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option (c) 1 × 10-9 m is the right answer.

The [oh−] of the solution  having a [h3o ] of 1 × 10−5 m is 1 × 10-9 m.

The concentration of OH- ions will be,

OH- = Kw {H3O+}

{H3O+} = 1 × 10−5 M.

Kw = 14

On substituting the value in the equation,

OH = 14 { 1 × 10−5 M.}

OH = 1 × 10−9 M

Consequently, the [H3O+] of the solution is 1 × 10-5 M.

Option (C) is the right choice because the [OH-] of the solution will be 1 × 10-9 M.

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After 0.0015 mol of NAOH is added to 0.5000 l of this solution, the pH is 3.37.

First, modify the Henderson-Hassle-batch equation to find the acid's pka.

[tex]pH=pka + log\frac{[A]}{[HA]}[/tex]

[tex]pka = pH-log\frac{[A]}{[HA]}[/tex]

[tex]=3.35- log \frac{[0.1500]}{[ 0.2000 ]}[/tex]

[tex]pka =3.47[/tex]

Molarity of the added NaOH.

[tex]M=\frac{mol}{L}[/tex]

[tex]=\frac{0.0015 mol}{ 0.5000L}[/tex]

= 0.003 M

In water, NaOH will dissociate

[tex]NaOH- > Na^{+} + OH^{-}[/tex]

strong base OH will react with HA

HA+ OH --> [tex]H_{2} O[/tex] + A

the reaction also produced A. as, all OH are consumed in the reaction

HA will be decreased by 0.003 M and A will be increased by 0.003 M.

[tex]HA= 0.2000-0.003 \\= 0.1970[/tex]

[tex]A=0.1500+0.003=0.1530 M[/tex]

solving new pH using pka and the new values of [HA] and [A]

[tex]pH=pka + log\frac{[A]}{[HA]}[/tex]

[tex]=3.35 + log\frac{[0.1530]}{[0.1970]}[/tex]

pH=3.37 is the ph after 0.0015 mol of naoh is added to 0.5000 l of this solution

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Answer:

Hydrogen bonding is the major intermolecular attraction responsible for the relatively high boiling points of alcohols.

Mn metal can be used as a sacrificial electrode to prevent the rusting of an iron pipe. So, the correct option is (c) Mn.

Commonly, sacrificial electrodes are employed to stop another metal from corroding or oxidising. A metal that is more reactive than the metal being shielded must serve as the sacrificial electrode. Magnesium, aluminium, and zinc are the three metals most frequently used in sacrificial anodes.

Manganese-Magnesium (Mn-Mg) electrode is more suited for on-shore pipelines where the electrolyte (soil or water) resistivity is higher since it has the highest negative electropotential of the three. In order to replenish any electrons that could have been lost during the oxidation of the shielded metal, the highly active metal offers its electrons.

Therefore, Mn metal can be used as a sacrificial electrode to prevent the rusting of an iron pipe. So, the correct option is (c) Mn.

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Ethers have a much lower boiling point than their isomeric alcohols because ether have not hydrogen bond that why ethers have lower boiling point .

Ethers will not have a hydrogen atom attached to the oxygen atom as alcohols do. Because ether molecules can not form intermolecular hydrogen bonds, their boiling points are much shorter than those of alcohol with such a comparable mass.

Owing to the combination of intermolecular H-bonding in alcohols though not in ethers, alcohols possess higher boiling temperatures than isomeric ethers.

Therefore, ethers have a much lower boiling point than their isomeric alcohols because ether have not hydrogen bond that why ethers have lower boiling point .

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Answer:

glucose and fructose

Explanation:

Sucrose is a disaccharide (a kind of sugar made of two monosaccharides) made of glucose and fructose

Answer:

4510 J

Explanation:

To calculate the energy of the water, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = energy/heat (J)

-----> m = mass (g)

-----> c = specific heat capacity (J/g°C)

-----> ΔT = change in temperature (°C)

First, you need to determine the mass of the water. To do this, you need to multiply the given volume by the density of water (1.00 g/mL).

 100.0 mL H₂O          1.00 g
------------------------  x  ------------  =  100.0 g H₂O
                                    1 mL

Now, you can plug the given values into the equation and solve for "Q" (Q = [tex]q_H_2_O[/tex]). The final answer should have 3 significant figures to match the given values with the lowest number of sig figs.

Q = ? J                           c = 4.18 J/g°C

m = 100.0 g                  ΔT = 32.0 °C - 21.2 °C = 10.8 °C

Q = mcΔT

Q = (100.0 g)(4.18 J/g°C)(10.8 °C)

Q = 4510 J

4510Answer:

Explanation:

The nature of ions formed by different atoms is as follows:

Ions are substances which are formed when neutral atoms gain or lose electrons.

There are two types of ions based on the charge the ion carries;

The nature of the ions formed by different atoms depend on whether the atoms are atoms of metals or atoms of non-metals.

Metal atoms form positively-charged ions by the loss of one or more electrons as illustrated below:

where; M is a metal atom, M⁺ is a metal ion, and e⁻ is an electron.

Non-metal atoms form negatively-charged ions by the gain of one or more electrons as illustrated below:

where; N is a non-metal atom, N⁻ is a non-metal ion, and e⁻ is an electron.

In conclusion, the nature of ions formed by atoms depends on the nature of the atom, whether they are metallic or non-metallic atoms.

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The concentration of the hydroxide ion given that the concentration of the hydronium ion 1.0 times 10^-14 M. The reverse mathematical method used to determine the pOH can be used to get the hydroxide ion concentration from the pOH. How many hydroxide ions are there in a solution with a pOH of 5.70, for instance.

Calculate 10-5.70, or "inverse" log, on a calculator (- 5.70). It indicates that one hydroxide ion is produced by one part of the NaOH solution. Because of this, the molar concentration of hydroxide ions in the solution is the same as the molar concentration of the NaOH.

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This family (ethane, propane, butane, etc) of materials is likely to have following set of properties.

The ethane, propane, butane, belong to alkanes family.The alkanes are also considers as saturated hudrocarbons. Ethane is found in gaseous stae Ethane is the second alkane followed by propane followed by butane.

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