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nlexa [21]
3 years ago
12

Which general trends in first ionization energy and electronegativity values are demonstrated by group 15 elements as they are c

onsidered in order from top to bottom(1) The first ionization energy decreases and the electronegativity decreases.
(2) The first ionization energy increases and the electronegativity increases.
(3) The first ionization energy decreases and the electronegativity increases.
(4) The first ionization energy increases and the electronegativity decreases.
Chemistry
1 answer:
MaRussiya [10]3 years ago
3 0

Answer: (1) The first ionization energy decreases and the electronegativity decreases

Explanation:

When we move from top to bottom in a periodic table the atomic size of elements increases and it becomes easy to remove valence electron from the elements at low energy.Thus decrease in ionisation energy from top to bottom.

Metallic character increases as we move down into a group of a periodic table and metals have low electronegativity than non-metals. So, value of electronegativity decreases from top to bottom.

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A student performs the reduction of 4-nitrobenzaldehyde (151.12 g/mol) with sodium borohydride (37.83 g/mol) in the presence of
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Answer:

65.4%

Explanation:

The redox reaction is a 1:1:1 reaction because the reagents suffer a double displacement reaction, and the substance that is substituted have the same charge (H+ and Br-), thus, we first need to know which of the reagents is the limiting.

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The mass of the product that was expected is then:

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The percent yield is the mass that was formed divided by the expected mass, and then multiplied by 100%:

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