B. work produces disorder in a system.
C. work produces waste heat, which leaves a system.
D. all of the above
3. Use your knowledge of collision theory to explain the results of your experiments in this laboratory.
Thestable form of salt at standard temperature and pressure is solid. If you addwater to salt, it will dissolve. However, there are certain factors that affectthe rate of solution formation of salt. The rate of formation of salt solutionis faster when the vial is agitated than when it is not agitated. By agitatingthe solution, you are increasing the surface area of the salt particles incontact with water.
Answer:
answer for number 2
Explanation:
By increasing the temperature of the solvent, the movement of molecules sped up resulting in the more movement of particles and they bump into each other more vigorously. As a result of that, the particles of the solute break faster and dissolve in the solvent faster .
Answer:
E = 1.8 x 10⁵ J/mol
Explanation:
We are being asked the enery per mol for an emission line corresponding to 649 nm.
The energy of a photon is given by the porduct of Planck's contant times the frequency of the radiation,
E = hν
We also know that the frequency is given by
ν = c/λ
where c is the speed of light (3 x 10 ^8 m/s) and λ is 649 nm given in the problem. Therefore the energy per photon will be given by
E= hc/λ = 6.626 x 10⁻³⁴Js x 3 x 10 ^8 m/s/ 649 x 10 ⁻⁹ m
E = 3.1 x 10 ⁻¹⁹ J/ photon
(Note the wavelength has to be in nanometers (1nm= 10⁻⁹ m) and that the energy we get is the energy per a single photon. Thus we will need to multiply this result by Avogadro's number to answer this question.
E = 3.1 x 10 ⁻¹⁹ J/ photon x 6.022 x 10 ²³photon/mol
E = 1.8 x 10⁵ J/mol
The energy of the 649 nm emission from strontium ions in a flare is approximately 1.83 x 10⁵ Joules per mole. This calculation is done using the formula for energy of a photon and converting it to energy per mole using Avogadro's number.
The energy of a single photon can be calculated using the equation E=hc/λ, where h is Planck's constant (6.626 x 10⁻³⁴ J.s), c is the speed of light (3.00 x 10⁸ m/s), and λ is the wavelength of the light in meters. First, let's convert the wavelength from nanometers to meters, which results in 649 x 10⁻⁹ m.
Putting these values into the equation, we get E= (6.626 x 10⁻³⁴ J.s x 3.00 x 10⁸ m/s) / (649 x 10⁻⁹ m). The calculated value is about 3.05 x 10⁻¹⁹ J. However, the question asks for the energy in joules per mole. Multiplying this value by Avogadro's number (6.022 x 10²³ mol⁻¹), we get about 1.83 x 10⁵ J/mol.
Therefore, the energy of the 649 nm emission from strontium ions in a flare is approximately 1.83 x 10⁵ Joules per mole.
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C₂H8 is Dimethocain-M. In C₂H₈ two atoms of carbon are present. Combustion of 6.40 mole C₂H₈ produced 12.8 moles of CO₂.
Combustion reaction refers to burning of compound in presence of oxygen. The reaction is accompanied by heat and light. One mole of burned carbon produced one mole of CO₂ gas.
Combustion is a chemical reaction between substances ,usually including oxygen and usually accomplished by the generation of heat and light.
Here we see that in C₂H₈ there are there are two carbons present then 2 moles of CO₂ gas is produced i.e. 2 × 6.40 = 12.8 moles.
Hence, 12.8 moles of CO₂ produced in combustion of 6.40 mole C₂H₈.
To learn more about combustion refer the link below;
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An appropriate hypothesis explaining the observation of distant galaxies moving away from each other, and that they do so more rapidly the further they are can be found in the Big Bang Theory. This theory suggests our universe began with a 'big bang' causing galaxies to move away from each other, a process which continues today.
Based on the observations mentioned, an appropriate hypothesis might involve the Big Bang Theory. This theory in physics and astronomy assumes that our universe started from a singularity - a very high-density and high-temperature state. The Big Bang Theory suggests that after the initial explosion, the galaxies began moving away from each other, a process which continues till today.
The farther a galaxy is from us, the faster it's receding, which is known as Hubble's Law. This observed phenomenon matches with the theory's premise, providing validating evidence for the Big Bang.
Learn more about Big Bang Theory here:
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