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Lunna [17]
3 years ago
14

The term "periodic" helps identify __________ that occur in the table, like electronegativity or atomic radii.

Chemistry
1 answer:
Montano1993 [528]3 years ago
6 0

Answer:

option C= patterns

Explanation:

The periodic table is helpful to identify the element readily. All the elements are arranged properly. The elements with same physical and chemical properties are placed in same group and period. Periodic table is also helpful to predict the properties of those elements which are not discovered yet. This table is also very helpful to balance the chemical equations. The horizontal rows are called periods while vertical column are called groups. There are seven periods and eighteen groups are in periodic table.

Trends in periodic table:

As we move left to right in a period the atomic radius is decreases with increase of atomic number. The ionization energy goes to increases from left to right in period because of greater hold of nuclear charge on valance electron, so that's way more energy is required to overcome this charge and to make the atom ionic.

From left to right in period electron affinity and electronegativity also increases.

As we move top to bottom in group ionization energy decreases with increase of atomic number  because of large atomic radius. The valance electron require less energy to move free. The electron affinity and electronegativity also decreases from top to bottom.

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Identify which of the following two reactions you would expect to occur more rapidly: (1) addition of HBr to 2-methyl-2-pentene
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Answer:

(1) addition of HBr to 2-methyl-2-pentene

Explanation:

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Therefore the <u>most stable carbocation</u> is the one produced by the 2-methyl-2-pentene. So, this molecule would react faster than 4-methyl-1-pentene. (See figure)

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For double-helix formation, DG can be measured to be 2 54 kJ mol 1 ( 2 13 kcal mol 1 ) at pH 7.0 in 1 M NaCl at 25 8C (298 K). T
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ΔS = -661.0J/mol is the entropy change for the system

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Explanation:

From the relationship between ΔG, T, ΔH and ΔS,

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plugging into the equation,

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ΔS  = -0.6610KJ/mol or in J.mol

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  • For entropy change for the surroundings = ΔS = ΔH/T
  • ΔS  = -251 kJ/mol / 298K
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