During a running (dynamic) compression test at idle, a good engine should produce PSI. A. 150 to 200 B. 100 to 150 C. 30 to 60 D. 60 to 90​

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:

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:

a. 5.2

Explanation:

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

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

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.

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:

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:

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:

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:

50.0 moles CO2

Explanation:

Answer:

Ok, thank you

Explanation:

Answer:

b

Explanation:

Answer:

D. Dry

Explanation:

Colorado's combination of high elevation, midlatitude, and continental interior geography results in a cool, dry climate.

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:

9.15

Explanation:

To solve this problem we'll use Henderson-Hasselbach's equation:

For this problem:

Now we calculate [NH₄Cl], first by converting 50.0 g of NH₄Cl into moles using its molar mass:

Meaning that [NH₄Cl] = 0.935 mol / 1.00 L = 0.935 M

Finally we calculate the pH:

The pH can be defined as the hydrogen ion concentration in the solution. The pH of ammonium chloride solution in ammonia is 9.16.

The molarity is the moles of a compound in the liter of solution. The molarity of 50 grams ammonium chloride in a liter of solution is given as:

[tex]\rm Molaity=\dfrac{mass}{molar\;mass\;\times\;volume(L)} \\\\NH_4Cl\;Molarity=\dfrac{50\;g}{53.491\;g/mol\;\times\;1\;L} \\\\NH_4Cl\;Molarity=0.935\;M[/tex]

The ammonia in the solution contributes to the pH from the ammonium chloride salt. The pH can be given as:

[tex]\rm pH=pKa+log\dfrac{acid}{salt}[/tex]

The pKa of ammonia is 9.25. The concentration of ammonia is given as 0.75 M.

The pH of the solution can be given as:

[tex]\rm pH=9.25+log\dfrac{0.75\;M}{0.935}\\ pH=9.25+(-0.09)\\pH=9.16[/tex]

The pH of the solution is 9.16.

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Answer:

d

Explanation:

increasing the temperature the fraction of molecules which collide with energy greater than Ea increase and hence the rate constant

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:

not sure but i think the answer is A

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:

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:

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:

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

Explanation:

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:

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:

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:

The answer is definitely D

Explanation:

Answer:

Explanation:

The principal reason why these statements are equivalent and identical is that there can be a progressional flow of heat from a hot object item to a cold object because of this entropy is increasing and expanding Δg < 0 but stream flow from cold to hot is nonspontaneous as Δg > 0.

e.g [tex]dS = \dfrac{\delta Q}{T}[/tex]

As found in heat engines and refrigerators.

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