Chemical Reaction and Equations

Q.1 Define chemical reaction?

Ans.: Those process which involve chemical change is called Chemical Reactions.

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Q.2 Define reactant?

Ans.: Substance which take part in a chemical reaction is called Reactant.

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Q.3 Define product?

Ans.: New substance which formed in a chemical reaction is called Product

  Reactant —------------> Product

                       Activity 1.1

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Q.4 Why is magnesium ribbon rubbed with sand paper before heating?

Ans.: when  magnesium ribbon kept in open it react with air and form a layer of oxide    over it .To remove that layer of oxide it rub with sand paper.

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Q.5 Name the type of reaction involved with the equation?

Ans.:    Mg + O2  -------------> MgO

    Combination reaction and Oxidation Reaction

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Q.6 Name the new substance formed in above reaction?

Ans.: MgO magnesium oxide (white powder) is formed.

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Q.7 What type of flame you observed during burning?

Ans.: Dazzling White Flame.

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Q.8 What is your observation when red litmus added to solution of product obtained in the above reaction? Give reason.

Ans.: MgO when dissolved in water it form Magnesium Hydroxide, so when Red litmus added into it, it turn blue.

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