chemical reactions and equations

who said "Facts are not science --- as the dctionary is not literature."

• Martin H. Fischer

• Albert Einstein

• Newton

In chemical reaction

• rearrangement of atoms takes place

• atoms of element change into different element to form compound

magnesiumm ribbon burns with

• dazzling white flame

• dazzling light green flame

• dazzling pink flame

when magnesium ribbon is burned it forms a white powder called

• magnesium carbonate

• magnesium oxide

magnesium ribbon before burning is cleaned by sandpaper. Why?

• to remove the layer of magnesium oxide

• to remove the layer of magnesium carbonate

we know chemical cange takes plaace when there is

• change is tempeature

• change in state

• change in colour

• formation of precipitate

• evolution of gas

substances which take part in chemical reation are known as

• reactants

• products

new substances formed in a chemical reaction is known as

• reactants

• products

the process in which new subtances with new properties are formed in known as

• chemical equations

• chemical reaction

a ______ equation has equal number of atoms of diferrent element in reactant and product

• balanced

• skeletal