Specialized periodicals in which scientists publish the results of their works are called scientific journals.
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In educational publishing, a scientific journal is a periodical book intended to similarly the progress of technology, typically by way of reporting new studies.
Journal articles may include original research, re-analyses of studies, opinions of literature in a selected place, proposals of new but untested theories, or opinion pieces.
These scientific journals include the following.
- original articles,
- case reports,
- technical notes,
- pictorial essays,
- reviews,
- commentaries
- editorials.
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Answer:
Explanation:
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In this case, considering the given chemical reaction, we can use the molar mass of octane (114.23 g/mol) and the 2:16 molar ratio with carbon dioxide to compute the emitted moles of CO2 to the atmosphere via the following stoichiometric procedure:
Which also corresponds to the following mass:
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Answer: (a) Mole fraction of 
is 0.66.
Mole fraction of 
is 0.33
(b) The partial pressure of is 1.98 atm.
The partial pressure of is 0.99 atm.
(c) The total pressure is 3.0 atm
Explanation:
Given: Volume = 
(1 
= 1 L) = 22.4 L
Moles of = 2.0 mol
Moles of = 1.0 mol
Total moles = (2.0 + 1.0) mol = 3.0 mol
Temperature = 273.15 K
- Now, using ideal gas equation the total pressure is calculated as follows.
where,
P = pressure
V = volume
n = number of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
- The mole fractions of each component:
The mole fraction of is calculated as follows.
The mole fraction of is as follows.
- The partial pressures of each component:
Partial pressure of are as follows.
Partial pressure of are as follows.
Explanation:
A physical change is change that alters the physical properties of matter especially its form and state.
In many cases, the change is easily reversible.
Examples are change of state such as boiling, melting, freezing, condensation, sublimation e.t.c
A chemical change is one in which a new kind of matter is formed. It is always accompanied by energy changes.
Examples are combustion, rusting , precipitation, milk souring.
- Chemical changes are irreversible
- Physical changes do not lead to the formation of new kinds of matter.
- Most physical changes requires little energy.
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Hydrogen sulfide = hidrogen + sulfur
6.500 g
a) 0.384 g + x
=> 6.500 = 0.384 + x => x = 6.500 - 0.384 = 6.116 g
Answer: 6.116 g of sulfur must be obtained
b) this experiment demonstrate the conservation of mass.
c) Dalton's atomic model states that the atoms cannot be created, split or be destroyed, and so in a chemical reaction the atoms rearrange but the number of each type of atoms remain constant, so the mass of each type of atoms and the total mass remain constant.
