5. State what is meant by the term 'activity series of metals. State the most reactive & the le
roactive metal from the following - Zn, Ag Na, Fe, Cu, Pb.
Give three reasons why - carbon dioxide is considered a compound, while carbon - an elemen
State what information is provided by the formula of calcium hydroxide - Ca(OH),
Answers
Answer:
The arrangement of metals in a horizontal column in order of their decreasing reactivity from top to bottom is known as the activity or reactivity series of metals .
Sodium (na) is the most reactive metal followed by zinc (zn) , iron ( fe) , lead (pb), copper(cu) and finally silver(ag).
1. carbon dioxide is a compound because it has more than one element which are carbon and oxygen .
2. Elements are pure substances but in compound like carbon dioxide we find the elements in fixed proportions.
3. Elements like carbon are represented by symbol ( C ) but carbon dioxide has a chemical formula ( CO2)
Calcium hydroxide's formula depicts that there is one atom of calcium combined to 2 atoms of hydroxide .
It is also called Slaked lime .
It is a metal hydroxide .
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