A buffered solution is made by adding 50.0g NH4Cl to 1.00 L of a 0.75M solution of NH3. Calculate the pH of the final solution. (assume no volume change).

Answer: compressibility

Explanation:

The ratio of the measured molar volume of a real gas to the measured molar volume  of an ideal gas is known as​ compressibility.

Compressibility is defined by the symbol Z and is calculated by the formula :

[tex]Z=\frac{PV}{nRT}[/tex]

For a gas with ideal behavior, molar volume of an ideal gas is equal to the molar volume of a real gas so Z= 1.

Answer:

The readings of equilibrium constant is incorrect.

Explanation:

There is a mistake in the value of equilibrium constant if the burette contains traces of distilled water because the water will be present in the solution from which equilibrium constant is calculated. The spectrophotometer did not give the correct reading because its calibration is incorrect. If we want to gain correct readings from the spectrophotometer, we must have to calibrate the instrument correctly.

Incorrect value of equilibrium constant is obtained.

Equilibrium constant of any reaction tells about the relative ration of the concentration of products to the reactants.

Value of equilibrium constant can be calculated in the aqueous medium where concentration of water also present. If we don't rinse the burette with the reaction solution then the already present traces of water affect the concentration of water during the calculation of equilibrium constant.

As the absorbance of any solution is also directly proportional to the concentration, so if the spectrometer is not calibrated accurately then incorrect value of absorbance also affects the value of equilibrium constant.

Hence, we get incorrect value of equilibrium constant for each of the given mistakes.

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Answer:

Student 4

Explanation:

In the structure of the atom of an element, there are protons, electrons and neutrons. The number of protons in the atom of such element determines the atomic number of the element. For example, if Calcium contains 20 protons, the atomic no of Calcium will be 20. Since this is so, it means that the identity of an element on the periodic table can be known using the number of protons/atomic no.

According to this question, four students are gathering information on elements to determine their identity. Based on the explanation above, it takes only the number of protons = atomic no. of the element to identify it. Hence, student 4, who counts the number of protons will correctly identify the element using his/her data.

Answer:

pH = 3.513

Explanation:

Hello there!

In this case, since this titration is carried out via the following neutralization reaction:

[tex]HONH_2+HCl\rightarrow HONH_3^+Cl^-[/tex]

We can see the 1:1 mole ratio of the acid to the base and also to the resulting acidic salt as it comes from the strong HCl and the weak hydroxylamine. Thus, we first compute the required volume of HCl as shown below:

[tex]V_{HCl}=\frac{22.0mL*0.200M}{0.15M}=29.3mL[/tex]

Now, we can see that the moles of acid, base and acidic salt are all:

[tex]0.0220L*0.200mol/L=0.0044mol[/tex]

And therefore the concentration of the salt at the equivalence point is:

[tex][HONH_3^+Cl^-]=\frac{0.0044mol}{0.022L+0.0293L} =0.0858M[/tex]

Next, for the calculation of the pH, we need to write the ionization of the weak part of the salt as it is able to form some hydroxylamine as it is the weak base:

[tex]HONH_3^++H_2O\rightleftharpoons H_3O^++HONH_2[/tex]

Whereas the equilibrium expression is:

[tex]Ka=\frac{[H_3O^+][HONH_2]}{[HONH_3^+]}[/tex]

Whereas Ka is computed by considering Kw and Kb of hydroxylamine:

[tex]Ka=\frac{Kw}{Kb}=\frac{1x10^{-14}}{9.10x10^{-9}} \\\\Ka=1.10x10^{-6}[/tex]

So we can write:

[tex]1.10x10^{-6}=\frac{x^2}{0.0858-x}[/tex]

And neglect the x on bottom to obtain:

[tex]1.10x10^{-6}=\frac{x^2}{0.0858}\\\\x=\sqrt{1.10x10^{-6}*0.0858}=3.07x10^{-4}M[/tex]

And since x=[H3O+] we obtain the following pH:

[tex]pH=-log(3.07x10^{-4})\\\\pH=3.513[/tex]

Regards!

Answer:

An element's atomic number refers to the number of protons found in the nucleus of each atom of the element.

Answer:

ur mom

Explanation:

ur mom lol

Answer:

tendency of molecules with unlike electrical charges to attract each other.

Explanation:

In all living organisms, in substances like carbohydrate, starch, urea etc. To prove sugar contains carbon, take a little amount of sugar in spoon and heat it gently till it melts and turned into yellowish color. On further heating it changes into brown colored mass and then black, which is charcoal.

Answer: sugar treated with strong sulphur acid turns to black

Explanation: sulphur acid removes water from sugars and carbon is left in residue.

This should not to try at home. Water boils when high temperature is achieved.

Also smell of burned sugar occurs

Answer:

Cl⁻ was oxidized.

Explanation:

Oxidation can be defined as the process in which the oxidation number of a substance increases.

On the left side of the equation, Cl has a charge of -1 (in HCl); while on the right side of the equation Cl has a charge of 0 in Cl₂.

Thus, Cl⁻ was oxidized.

Answer:

50.0 moles CO2

Explanation:

Answer:

C. Hydrogen bonds​

Explanation:

Strongest intermolecular force

Hydrogen Bonding (H-Bonding)

Hydrogen bonds are caused by highly electronegative atoms. They only occur between hydrogen and oxygen, fluorine or nitrogen, and are the strongest intermolecular force.

Answer: C hydrogen bonds

Explanation:

Answer:

According to the law of conservation of energy, energy cannot be created or destroyed, although it can be changed from one form to another. KE + PE = constant. ... As the car coasts down the hill, it moves faster and so it's kinetic energy increases and it's potential energy decreases. hope this helps

Explanation:

Answer:

They cannot be destroyed or created however,

Explanation:

it can only be transformed or transferred from one form to another.

Answer:

a. 5.2

Explanation:

pOH = -log(1.43 x 10^-9) = 8.845

pH = 14 - pOH = 14 - 8.845 = 5.155 ≈ 5.2

The number of moles that are present in 0.75 g of ammonia is 0.04 moles.

Relation between the mass and moles of any substance will be represented as:

n = W/M, where

On putting all these values, we can calculate the moles of ammonia as:

n = 0.75g / 17g/mol = 0.04 mole

Hence required moles of ammonia is 0.04 moles.

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#SPJ2

Answer:

A vitamin is an organic molecule (or a set of molecules closely related chemically, i.e. vitamers) that is an essential micronutrient which an organism needs in small quantities for the proper functioning of its metabolism. Essential nutrients cannot be synthesized in the organism, either at all or not in sufficient quantities, and therefore must be obtained through the diet. Vitamin C

Answer:

Explanation:

From the information given:

oxidation of oxidized solution takes place at 950° C

For wet oxidation:

The linear and parabolic coefficient can be computed as:

[tex]\dfrac{B}{B/A} = D_o \ exp \Big [\dfrac{-\varepsilon a}{k_BT} \Big][/tex]

Using [tex]D_o[/tex] and [tex]E_a[/tex] values obtained from the graph:

Thus;

[tex]\dfrac{B}{A} = 1.63 \times 10^8 exp \Big [ \dfrac{-2.05}{8.617 \times 10^{_-5}\times 1173}\Big] \\ \\ = 0.2535 \ \ \mu m/hr[/tex]

[tex]B= 386 \ exp \Big [-\dfrac{0.78}{8.617 \times 10^{-3} \times 1173} \Big] \\ \\ = 0.1719 \ \mu m^2/hr[/tex]

So, the initial time required to grow oxidation is expressed as:

[tex]t_{ox} = \dfrac{x}{B/A}+ \dfrac{x^2}{B} - t_o (initial)[/tex]

[tex]where; \\ \\ t_{ox} = 2 \ hrs;\\ \\ x = 0.5 \\ \\ B/A = 0.2535 \\ \\ B = 0.1719[/tex]

∴

[tex]2= \dfrac{0.5}{0.2535}+ \dfrac{0.5^2}{0.1719} - t_o (initial)[/tex]

[tex]2 = 3.4267 - t_o (initial) \\ \\ t_o(initial) = 3.4267 - 2 \\ \\ t_o(initial) = 1.4267 \ hr[/tex]

NOW;

[tex]1.4267 = \dfrac{d_o}{0.2535} + \dfrac{d_o^2}{0.1719} \\ \\ 1.4267 = 3.9448 \ d_o + 5.8173 \ d_o^2 \\ \\ d_o^2 + 0.6781 \ d_o = 0.2453[/tex]

[tex]d_o = \dfrac{-b \pm \sqrt{b^2-4ac}}{2a}[/tex]

[tex]d_o = \dfrac{-(0.6781) \pm \sqrt{(0.6781)^2-4(1)(-0.245)}}{2(10)}[/tex]

[tex]d_o = \dfrac{-(0.6781) \pm \sqrt{0.45981961+0.98}}{20}[/tex]

[tex]d_o = \dfrac{-(0.6781) \pm \sqrt{1.43981961}}{20}[/tex]

[tex]d_o = \dfrac{-(0.6781) + \sqrt{1.43981961}}{20} \ OR \ \dfrac{-(0.6781) - \sqrt{1.43981961}}{20}[/tex]

[tex]d_o =0.02609 \ OR \ -0.0939[/tex]

Thus; since we will consider the positive sign, the initial thickness [tex]d_o[/tex] is ;

≅ 0.261 μm

Answer:

a) Base Peak

b) Base Peak

c) Molecular Ion

d) Base Peak and Radical Cation

e) The Parent Ion, Molecular Ion, the Radical Cation and the Base Peak

Explanation:

a) The Base Peak is assigned a relative intensity of 100.

b) The Base Peak is the most intense peak in the mass spectrum.

c) The Molecular Ion Peak represents the original molecule that has only lost an electron.

d) Base Peak and Radical Cation could be/represent a smaller, charged fragment of the original molecule.

e) The Parent Ion, the Molecular Ion, the Radical Cation/ the Base Peak is/represents a positively charged species.

I uploaded the answer to a file hosting. Here's link:

tinyurl.com/wpazsebu

Answer:

I would say A. I'm no expert, but it can't be C obviously, and I think wind would hit all of it, wearing off the top as well like the great pyramids. B would be my next choice, but A i think would be best.

Answer:

Ok, thank you

Explanation:

Answer:

Transports Dissolved gases and Controls pH The pH of blood must remain in the range 6.8 to 7.4, otherwise it begins to damage cells.

Explanation:

main functions tho Transportation. Nutrients from the foods you eat are absorbed in the digestive tract. ...

Defense. Many types of WBCs protect the body from external threats, such as disease-causing bacteria that have entered the bloodstream in a wound.

Maintenance of Homeostasis. Recall that body temperature is regulated via a negative-feedback loop.

Answer:

Transform = the third one

convergent = the first one

divergent = the second one

Explanation:

Answer:

Hello your question is poorly written below is the well written question

Uranium, an important component of both nuclear weapons and nuclear reactors, has two major isotopes, U-238, which has a half-life of  approximately 4.5 billion years, and U-235, which has a half-life of approximately 700 million years. Both were present in equal amounts at the time of the creation of the Earth, 4.5  billion years ago. How many years after the creation of the Earth had the amount of radiation from uranium decayed to half the amount present at the time of the creation of the Earth

Answer : 140 billion years

Explanation:

Given that :

U-238   h1/2 = 4.5 billion years

U-235   h1/2 = 700 million years

At the beginning both Isotopes where present in equal amount

Determine the T years before the amount of Uranium decays to Half

T =   ?    N'2 = N1 / 2

we know that N = No ( 1/2 )^h   where h = time / half-life time

attached below is the detailed solution of the given problem

Answer:

The answer is definitely D

Explanation:

Answer:

Retention factor or [tex]R_f[/tex] value is defined as the ratio of distance traveled by the unknown to the distance traveled by the solvent front.

[tex]R_f=\frac{\text{ distance by unknown}}{\text {distance by solvent}}[/tex]

Putting in the values we get:

[tex]R_f_{X}=\frac{0.50cm}{3.0cm}=0.16[/tex]

[tex]R_f_{Y}=\frac{1.0cm}{3.0cm}=0.33[/tex]

As the [tex]R_f[/tex] value of Y is more than X , it follows that Y compound will be retained less strongly than the compound X. Thus Y is more polar than X.

Answer:

31,380 Joules

Explanation:

Given Data:

Mass = m = 100 g

Temperature 1 = = 25 °C

Temperature 2 = = 100 °C

Specific Heat Constant = c = 4.184

Change in Temp. = ΔT = 100 - 25 = 75 °C

Required:

Heat = Q = ?

Formula:

Q = mcΔT

Solution:

Q = (100)(4.184)(75)

Q = 31, 380 Joules

Hope this helped!

~AH1807

Answer:

[tex]\Large \boxed{\sf 31400\ J}[/tex]

Explanation:

Use formula

[tex]\displaystyle \sf Heat \ (J)=mass \ (g) \times specific \ heat \ capacity \ (Jg^{-1}\°C^{-1}) \times change \ in \ temperature \ (\°C)[/tex]

Specific heat capacity of water is 4.18 J/(g °C)

Substitute the values in formula and evaluate

[tex]\displaystyle \sf Heat \ (J)=100.0 \ g \times 4.18 \ Jg^{-1}\°C^{-1} \times (100\°C-25\°C)[/tex]

[tex]\displaystyle Q=100.0 \times 4.18 \times (100-25 )=31350[/tex]

Answer:

Their sleek shape makes them more aerodynamic which reduces the contact force.

Answer: The are formed in a way so they create less friction against the air and water. Helping the jet stream create less traction so it moves faster. Like how a bullet is designed. The pointed front and narrow body helps it move faster through the air. Less things sticking of these object so friction is avoided, and they can easily move speedily. The same thing goes for cars, the more narrow they are as well as pointed makes it easier to push through the air making the wind resistance extremely low.

Hope this helps :)

Answer:

pH = 7.08

Explanation:

We can solve this problem using Henderson-Hasselbach's equation:

With the given concentrations and volumes, we can calculate the new values for [ClO⁻] and [HClO] when the solutions are mixed:

Now we calculate pKa:

Finally we calculate the pH:

Answer:

You will know if elements have the same properties if they are in the same column (up and down) on the periodic table.

Explanation:

Ex: Lithium and a hydrogren has the same properites bcause they are both on the same line/column. Columns are up and down the table and rows are left and right. Hope this helps