Question

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Answer 1

Answer:

1.A:A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products. combustion. Log burning in a fire. Burning wood is an example of a chemical reaction in which wood in the presence of heat and oxygen is transformed into carbon dioxide, water vapour, and ash.

2.A:Yes; new substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.

Answer 2

Answer:

1. Chemical reactions are type of reactions in which two or more substances react with each other to form new substances . Ex :- burning of wood .

2. The three conditions are :-

a. Close contact of substances

b. Physical state of the reactant

c. Surface area of the reactant

(a) example : formation of ammonium chloride from ammonia and hydrochloric acid .

(b) example : sodium chloride plus silver nitrate → silver chloride plus sodium nitrate .

(c) example : zinc metal and zinc shavings are added to dilute hydrochloric acid to give out hydrogen gas .

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