Elements are organized on the periodic table based on their properties. Which statement correctly predicts and explains the chem
2 answers:
<u>Answer:</u> The correct answer is Option A.
<u>Explanation:</u>
Chemical reactivity is defined as the tendency of an atom to loose or gain electrons.
Metals are the elements that looses electrons and thus, their chemical reactivity will be the tendency to loose electrons.
Their chemical reactivity decreases as we move from left to right in a period. This is so because, the electron get added up in the same shell. So, the electron in the outermost orbital gets more tightly bonded to nucleus. And hence, loosing an electron will require high energy. Thus, the chemical reactivity decreases.
- Alkali metals are the elements which belong to group 1 of the periodic table. The general electronic configuration of these metals is
These metals will loose 1 electron to form +1 ions.
- Alkaline earth metals are the elements which belong to group 2 of the periodic table. The general electronic configuration of these metals is
These metals will loose 2 electrons to form +2 ions.
Hence, the correct answer is Option A.
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Answer:
The molarity of this solution is 0,09254M
Explanation:
The concentration of the Ni²⁺ solution is:
Ni²⁺ + EDTA⁴⁻ → Ni(EDTA)²⁻
0,03935L × 0,01307M = 5,143x10⁻⁴ moles Ni²⁺ ÷ 0,03010L =<em>0,01709M Ni²⁺</em>
25,00 mL of this solution contain:
0,01709M × 0,02500L = 4,2716x10⁻⁴ moles of Ni²⁺
The moles of Ni²⁺ that are in excess and react with EDTA⁴⁻ are:
0,01015L × 0,01307M = 1,3266x10⁻⁴ moles of Ni²⁺
Thus, moles of Ni²⁺ that react with CN⁻ are:
4,2716x10⁻⁴ - 1,3266x10⁻⁴ = 2,9450x10⁻⁴ moles of Ni²⁺
For the reaction:
4CN⁻ + Ni²⁺ → Ni(CN)₄²⁻
Four moles of CN⁻ react with 1 mole of Ni²⁺:
2,9450x10⁻⁴ moles of Ni²⁺ × = <em>1,178x10⁻³ moles of CN⁻</em>
As the volume of cyanide solution is 12,73mL. The molarity of this solution is:
<em>1,178x10⁻³ moles of CN⁻ ÷ 0,01273L = </em><em>0,09254M</em>
I hope it helps!