“Models are developed when a scientist’s creativity and insight are combined with data and observations about many similar scenarios”. Models are used for a lot of things in science. As we know everything has advantages and disadvantages, and the same applies to models. Models help us illustrate the concept and formulate hypothesis. When models are used, the scientists are able to notice patterns and develop and revise representation that become a useful model, which makes their scientific knowledge stronger and helps them understand more about the nature of science. Models are a simplified representation. One of the biggest advantages of the model is, that it allows you to have a look at things which are too small such as atoms or too big such as the solar system.
Although, having many benefits, models have quite a number of disadvantages. Models sometimes oversimplify the process therefore leading to a misunderstanding. As models are supposed to be a simplified representation, they will not be complex, which means they will lack detail. For Example “our particle model explains many things about matter, it is not comprehensive — for example, it cannot predict why certain materials have different electrical properties. We could add further refinements that are outside the scope of this course to enable it to do so, but it would make our model so complicated that it would no longer be useful to us”
Answer:
Answer :
The total pressure inside the cylinder is, 6.7 atm
The mole fraction of N_2 in the mixture is, 0.52
Solution :
First we have to calculate the total pressure inside the cylinder.
According to the Dalton's law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gasses.
P_T=p_{N_2}+p_{O_2}+p_{Ar}+p_{He}
Now put all the given values is expression, we get the total pressure inside the cylinder.
P_T=3.5+2.8+0.25+0.15=6.7atm
Now we have to calculate the mole fraction of N_2 in the mixture.
Formula used :
pN_2=XN_2 x P_T
where,
P_T = total pressure = 6.7 atm
pN_2 = partial pressure of nitrogen gas = 3.5 atm
XN_2 = mole fraction of nitrogen gas = ?
Now put all the given values in the above formula, we get
3.5atm=XN_2 x 6.7atm
XN_2=0.52
Therefore, the total pressure inside the cylinder is, 6.7 atm and the mole fraction of N_2 in the mixture is, 0.52
Hope it helps answer the question:)
I think the answer is transparent and translucent
Answer:
hope you understand and your answer is correct
Answer:
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
Isotopic notation: Protons Neutrons Electrons
¹⁹⁷₇₉Au 79 118 79
Solution:
p+n = atomic mass = 79+118 = 197
e = 79 (atomic number) so the element with atomic number Au.
Isotopic notation: Protons Neutrons Electrons
⁷⁹₃₅Br 35 44 35
Solution:
Number of neutrons = atomic mass - number of protons= 79-35 = 44
Number of protons and electrons are equal so number of electrons are 35.
Isotopic notation: Protons Neutrons Electrons
¹²⁷₅₃I 53 74 53
Solution:
The atomic number of iodine is 53.
Number of neutrons = atomic mass - number of protons= 127-53 = 74
Number of protons and electrons are equal so number of electrons are 53.
Isotopic notation: Protons Neutrons Electrons
⁵⁶₂₆Fe 26 30 26
Solution:
The atomic number of iron is 26.
atomic mass = n+p= 26+30= 56
Number of protons and electrons are equal so number of electrons are 26.
