The statement which correctly describes periodic trends in ionization energy is: B. Ionization energy generally increases from bottom to top and left to right.
A Periodic table is an organized tabular array of all the chemical elements arranged in order of increasing atomic number (in rows).
Ionization energy can be defined as the minimum energy required to remove (detach) an electron from a neutral atom in its gaseous state.
Generally, ionization energy tend to increase from left to right across a period on the periodic table and from bottom to top in each group of a periodic table.
This increase is mainly because the atomic radius of chemical elements generally decreases across the periodic table, typically from alkali metals (group one elements) such as sodium, lithium and hydrogen to noble gases (group eight elements) such as neon, helium, and argon. Thus, the periodic trend for ionization energy is from left to the right and bottom to top of the periodic table.
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A bike rusting is an example of a chemical
change since rusting is a chemical reaction. New substances are formed from
this reaction. On the other hand, other choices given are just physical changes
because only the shape or the physical form of the substances are being
changed. An example of a physical change is cutting a paper.
Answer:
0.0630
Explanation:
The molar mass of urea = 60 g/mol
we all know that:
Then; the number of moles of urea
=
= 0.0667 mol
Similarly; the number of moles of methanol
=
= 0.9988 mol
The total number of moles = (0.0667 + 0.9988) mol
= 1.0655 mol
Finally,the mole fraction of urea =
=
= 0.0630