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4 years ago

What is the answer to number 14 ?

Chemistry

1 answer:

Yuri [45]4 years ago

8 0

Answer:

a) 2 significant figures

b) 5 significant figures

c) 5 significant figures

d) 1 significant figures

Explanation:

• All non-zero digits are significant.

E.g. - 421 has 3 significant figures.

• Zeros between non-zero digits are significant.

E.g. - 502 has 3 significant figures.

• In a decimal less than 1, all zeros to the left of non-zero digits are not significant.

E.g. - 0.0345 has 3 significant figures.

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B. nuclear to thermal to mechanical to electrical

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Identify each statement as true or false. Explain in every case.a.Ionization energies are always negative quantities.b.Oxygen ha

worty [1.4K]

Answer:

(a) FALSE

(b) FALSE

(d) FALSE

Explanation:

Ionization energy refers to the energy needed for removal of a valence electron present in valence shell of a gaseous atom.

(a) The value of ionization energy of an atom is always positive. This is because energy has to be always supplied or provided to a gaseous atom for the removal of the valence electron.

Therefore, the statement (A) is false

(b) The ionization energy of an atom increases across a period i.e. from left to right. This is because the effective nuclear charge that is experienced by the valence electron increases from left to right in the periodic table, as the atomic number increases.

So, more energy is required to remove the valence electron of fluorine as compared to oxygen.

Therefore, the ionization energy of fluorine is greater than oxygen.

Therefore, the statement (B) is false

(c) First ionization energy is energy needed for removal of first electron present in valence shell of a neutral atom. Whereas, second ionization energy is the energy needed for removal of second electron present in valence shell of a monovalent cation

The second ionization energy of an atom is always greater than the first ionization energy. This is because removing an electron from a positively charged species, requires more energy.

Therefore, the statement (C) is true

(d) The third ionization energy refers to the energy needed to remove the third electron from a divalent cation.

Therefore, the statement (D) is false

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3 years ago

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The process that releases energy which causes lightning is known as Glaciation

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