Question

when we can say any chemical reaction takes place​

Answer 1

⚫When a chemical reaction takes place,

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:

i) CHANGE IN COLOURS

ii) CHANGE IN ODOUR

iii) CHANGE IN TEMPERATURE