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gladu [14]
3 years ago
9

When a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. Why is the burning o

f magnesium considered a chemical change?
Chemistry
2 answers:
yKpoI14uk [10]3 years ago
5 0
It's considered a chemical change because the whitish substance is now newly produced.
katen-ka-za [31]3 years ago
4 0

Balanced chemical reaction: 2Mg(s) + O₂(g) → 2MgO(s).

This is chemical change (chemical reaction), because new substance (magnesium oxide MgO) is formed, the atoms are rearranged and the reaction is followed by an energy change (exothermic reaction because energy is released).

Chemical changes (chemical synthesis) is when a substance combines with another (in this example magnesium and oxygen) to form a new substance.

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Write the formula for a complex formed between co3 and nh3, with a coordination number of 6.
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In complex compounds coordination number is the number of atoms or polyatomic ions surrounding the central metal. In given statement the coordination number given is 6, means there are 6 ligands surrounding the metal atom, and the ligands given are only NH₃, so 6 NH₃ molecules are surrounding the Cobalt atom. Hence,

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As, NH₃ is neutral so the charge on sphere will be the charge on Co, as charge given in statement id +3 so,

                                               [Co (NH₃)₆]³⁺

Name of this complex is as follow,

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