REVISION -7

Particles are arranged tightly in

• solid

• liquid

• gas

During melting the arrangement particles in solid

• becomes more tight

• becomes more separated from one another

Magnesium reacts with oxygen and forms magnesium oxide. It is an example of (a)   reaction

60 atoms of carbon joins and becomes a football like structure is (a)  

calcium oxide dissolves in water and forms

• calcium carbonate

• calcium hydroxide

when copper carbonate is heated, the products formed are

• Calcium Oxide and carbondioxide

• Copper Oxide and carbondioxide

Carbondioxide is identified with a test using

• calcium sulphate

• calcium hydroxide

write an experiment for the formation of copper oxide and explain the procedure one by one -refer book-2 -page number152 .

word equation for the thermal decomposition of copper carbonate is

• copper carbonate--> copper oxide + carbondioxide

• copper carbonate--> copper oxide

(a)   dissolves in water to form calcium hydroxide Ca(OH)2