Chemistry, 17.07.2019 08:40 maltbie1283

Iwill award ! members of the alkaline earth elements have several things in common. they are a) nonmetals and are nonreactive. b) metals with two valence electrons. c) metals that are not very reactive. d) metalloids with two valence electrons. after the fission of u-235 takes place, how many neutrons does the missing nucleus have? a) 84 b) 85 c) 141 d) 143

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First question:
All metals
All share metallic properties
All solids at room temperature

Second question:
In nuclear fission, heavier nuclei breaks into two or more particles which are relatively stable than the former one.
The reaction can be written as,
U-235 > X-k + Kr-92 + 2n
X is the unknown element which is to be determined.
Mass is conserved in Nuclear fission but not in nuclear fusion.

Therefore, mass of X will be 141. Which is an isotope of Barium. Thus the missing element was Barium.
Therefore, X-k = Ba-141, k=141.
Tomic number of Ba is 56. Therefore, number of neutrons of missing nucleus(Barium) = 141 -56 = 85.

Answer from: Quest

answer: - 3.) the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

solution: - as per the rules, oxidation number of oxygen in its compounds is -2. the sum of oxidation numbers of all the elements of a molecule or compound is zero.

also, the oxidation number in elemental form is zero.

in no, the oxidation number of o is -2 so the oxidation number of n is +2 so that the sum is zero.

similarly, the oxidation number of c in co is +2 and o is -2.

on product side the oxidation number of n is 0 as it is in the elemental form( $n_2$ ) .

oxidation number of c in carbon dioxide is +4 as there are two oxygen in it and we know that each oxygen is -2.

so, oxidation number of n is changing from +2 to 0 and the oxidation number of c is changing from +2 to +4.

since nitrogen is reduced and hence no is acting as an oxidizing agent. carbon is oxidized and so co is acting as a reducing agent.

so, the right choice is number 3.)the oxidation state of nitrogen in no changes from +2 to 0, and the oxidation state of carbon in co changes from +2 to +4 as the reaction proceeds.

Answer from: Quest

Sun is explosive itself spread 9 planets.earth is 3rd explosive in the solar system about 500 hundred million years ago . first earth became ice age and freezing climate.centre of earth magma. north zone is artic . south is anatric

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Iwill award ! members of the alkaline earth elements have several things in common. they are a) no...