CHEMISTRY HIGH SCHOOL

Calculate the pH of a solution that is 0.111 M HCl. PH=?

Answers

Answer 1
Answer: HCl(aq) ------> H⁺(aq)  + Cl(aq)  
     ↓                    ↓            ↓
i :   0.111 M          0               0
v: - 0.111 M     +0.111 M   +0.111 M
_______________________________
eq:    0            +0.111 M    +0.111 M 

HCl is a strong acid, so it ionizes 100% in solution :

PH = - log [ H+]

PH = - log [ 0.111]

PH = 0.9546

hope this helps!

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The superheated water vapor is at 15 MPa and 350°C. The gas constant, the critical pressure, and the critical temperature of water are R = 0.4615 kPa·m3/kg·K, Tcr = 647.1 K, and Pcr = 22.06 MPa. Determine the specific volume of superheated water based on the ideal-gas equation. (You must provide an answer before moving to the next part)

Answers

Answer:

0.01917 m^3/kg.

Explanation:

Given:

P = 15 MPa

= 1.5 × 10^4 kPa

T = 350 °C

= 350 + 273

= 623 K

Molar mass of water, m = (2 × 1) + 16

= 18 g/mol

= 0.018 kg/mol

R = 0.4615 kPa·m3/kg·K

Using ideal gas equation,

P × V = n × R × T

But n = mass/molar mass

V = (R × T)/P

V/M = (R × T)/P × m

= (0.4615 × 623)/1.5 × 10^4

= 0.01917 m^3/kg.

Final answer:

The specific volume of superheated water vapor under the conditions of 15 MPa pressure and 350°C temperature, using the ideal gas equation, is approximately 0.01919 cubic meter per kilogram.

Explanation:

The question is asking to calculate the specific volume of superheated water vapor using the ideal gas equation P = ρRT, where P is the pressure, ρ is the density (inverse of specific volume), R is the gas constant, and T is the temperature.

To find the specific volume (v), we need to rearrange the ideal gas equation to v = RT/P. Given that the pressure P = 15 MPa = 15000 kPa, the gas constant R = 0.4615 kPa.m³/kg.K, and the temperature T = 350°C = 623.15 K (adding 273 to convert °C to K), we can substitute these values into our rearranged equation balance to calculate for v.

The specific volume v = (0.4615 kPa.m³/kg.K * 623.15 K) / 15000 kPa = 0.01919 m³/kg. So, the specific volume of superheated water vapor under the given conditions is approximately 0.01919 cubic meter per kilogram.

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The greatest amount of energy released per gram of reactants occurs during a(1) redox reaction(2) fission reaction
(3) substitution reaction
(4) neutralization reaction

Answers

Answer : The correct option is, (2) Fission reaction.

Explanation :

  • Fission reaction : This is a type of nuclear reaction in which the splitting of bigger nuclei into two smaller nuclei takes place. During this process, the large amount of energy is released.
  • Redox reaction : This is an oxidation-reduction reaction in which the electrons transferred between the two molecules.
  • Substitution reaction : In this reaction, one functional group is replaced by the another functional group in a chemical compound.
  • Neutralization reaction : In this reaction, the acid and base react to give water and a salt.

Redox reaction, substitution reaction and neutralization reaction are the chemical reactions in which the heat releases when the chemical bonds are breaking and forming.

Therefore, the greatest amount of energy released per gram of reactants occurs during the fission reaction.
The answer is (2) fission reaction. The other three are chemical reaction, so they change the chemical energy to heat to release when chemical bonds breaking and forming . But for fission reaction, the nucleus have been changed. So the mass change to energy to release.

Which change in oxidation number indicates oxidation?(1) –1 to +2 (3) +2 to –3
(2) –1 to –2 (4) +3 to +2

Answers

The change that shows an oxidation is the change  –1 to +2.

What is oxidation?

The term oxidation has to do with an increase in oxidation number. This increase will always be positive.

Hence, we have to look out for the change in which there is an increase in oxidation number and this occurs for the change –1 to +2.

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Oxidation is the loss of electrons (OILRIG, oxidation is loss, reduction is gain), so that would mean a gain in charge (Well from negative to positive). The only one to show charge going up is (1)

__CH4 + __S8 ----> __CS2 + __H2SBalance this equation and calculate the mol CS2 produced when 1.50 mol S8 is used.

Answers

The new balanced equation would be:
 2 CH4 +  1 S8 ---->  2 CS2 +   4 H2S

1.50 mol S8  x   2 mol CS2  =  3 mol CS2
         1                1 mol S8

Final answer:

The balanced chemical equation is CH4 + 4S8 --> CS2 + 4H2S. The moles of CS2 produced from 1.50 mol S8 will be 1.50 mol.

Explanation:

To balance the chemical equation CH4 + S8 --> CS2 + H2S, we'll start by balancing the sulfur atoms. The balanced equation becomes: CH4 + 4S8 --> CS2 + 4H2S. Now, count the carbon and the hydrogen atoms on both sides. These are balanced successfully, and hence the overall equation is balanced.

Now, let us calculate the moles of CS2 produced from 1.50 mol S8. Using stoichiometry, a ratio derived from the balanced equation, we find that 1 mol of S8 produces 1 mol of CS2. So, 1.50 mol S8 will produce 1.50 mol CS2.

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Why carbon is a basic thing to classify as organic and inorganic compounds?​

Answers

Answer:

To answer, all living organisms contain carbon-based compounds, which classifies them organic.

Simply, carbon dioxide, is an example of an inorganic compound since it does not contain both carbon and hydrogen. Alternatively, one molecule of carbon dioxide contains one atom of carbon and two atoms of oxygen.

After raining when do rain drops dry away easily on a cloudy day or on a sunny day? explain

Answers

on a sunny day the temperature might be above 40°C which will cause the water to vaporize quicker as if it were cloudy and colder


    I would tend to think that the amount of sunlight reaching the water is irrelevant.

The color of the surface that the water lies on is more important.  A black, matte

surface absorbs more infrared radiation than a light-colored, reflective surface.
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