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andrezito [222]
3 years ago
6

Is nail polish a pure substance or a mixture?

Chemistry
2 answers:
ss7ja [257]3 years ago
7 0
Nail polish is a mixture.
docker41 [41]3 years ago
5 0
It is a mixture because the Sundance was combined by chemical means
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Compute the value of the molar heat capacity at constant volume, CVCV, for CO2CO2 on the assumption that there is no vibrational
katovenus [111]

Answer:

Explanation:

Molar heat capacity at constant volume Cv  of a gas = n x .5 R where n is degree of freedom of the gas molecules

CO₂ is a linear molecule , so number of degree of freedom =  3 + 2 = 5

3 is translational and 2 is rotational degree of freedom . There is no vibrational degree of freedom given .

So Cv = 5 / 2 R

= 2.5 R .

4 0
3 years ago
How do you convert in the metric system?
julia-pushkina [17]

Answer:

To convert among units in the metric system, identify the unit that you have, the unit that you want to convert to, and then count the number of units between them. If you are going from a larger unit to a smaller unit, you multiply by 10 successively. If you are going from a smaller unit to a larger unit, you divide by 10 successively

Explanation:

hope it helps

7 0
3 years ago
Hydrogen sulfide decomposes according to the following reaction, 2 H2S(g) → 2 H2(g) + S2(g) where ∆S = +78.1 J/K, ∆H = +169.4 kJ
arlik [135]

Answer:

The reaction is spontaneous when T > 2170 K.

Explanation:

The spontaneity of a reaction is related to the standard Gibbs free energy (ΔG°). When ΔG° < 0 the reaction is spontaneous. ΔG° is related to the standard enthalpy (ΔH°) and the standard entropy (ΔS°) through the following expression:

ΔG° = ΔH° - T.ΔS°

where,

T is the absolute temperature

The reaction is spontaneous when ΔG° < 0, that is,

ΔH° - T.ΔS° < 0

ΔH° <  T.ΔS°

T > ΔH°/ΔS° = (169.4 × 10³ J)/(78.1 J/K) = 2170 K

The reaction is spontaneous when T > 2170 K.

7 0
4 years ago
What is arranged to form a material with a crystal structure
mafiozo [28]

Answer:

A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. The scientific study of crystals and crystal formation is known as crystallography.

Explanation:

3 0
3 years ago
Nicotine is responsible for the addictive properties of tobacco. assume kb1 = 1.0×10-6 and kb2 = 1.3×10-11 . determine the ph of
Naddika [18.5K]
If we abbreviate the formula for nicotine as Nic, then the equations for two different equilibria of Nic in water are 
     Nic + H2O ---> NicH+ + OH- 
     NicH+ + H2O ---> NicH2 2+ + OH-  

We can write the Kb1 expression for the first equation as 
     Kb1 = 1.0×10^-6 = [NicH+][OH-] / [Nic] 
     1.0×10^-6 = x^2 / 1.85×10^-3 - x 
Approximating that x is negligible compared to 1.85×10^-3 simplifies the equation to   
     1.0×10^-6 = x^2 / 1.85×10^-3 
     x = 0.0000430 
     x = [OH-] = 4.30×10^-5 M  

From the Kb2 expression 
     Kb2 = 1.3×10-11 = [NicH2 2+][OH-] / [NicH+]  
     1.1×10^-10 = x^2 / 4.30×10^-5 - x 
Approximating that x is negligible compared to 4.30×10^-5 simplifies the equation to 
     1.1×10^-10 = x^2 / 4.30×10^-5 
     x =  [OH-] = 6.88×10^-8  

The concentration [OH-] can be computed as 
     [OH-] = 4.30×10^-5 M + 6.88×10^-8 M = 4.30×10^-5 M  
This shows that the second equilibrium has a negligible effect on the pH.  

We can now calculate for pH:   
     pOH = -log [OH-] = -log (4.30×10^-5 M) = 4.37 
     pH = 14 - pOH = 14 - 4.37 = 9.63
7 0
4 years ago
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