What is a chemical change ? Give the characteristic of a chemical change.
Answers
The color changed from yellow/orange, red to blue-black in the first cup. In the scond cup, the color changed and bubbles formed. 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.
Challenge: food cooking, rust formation, tarnish forming on doorknobs, fuel burning for heat, tarnished penny.
Answer:
A chemical change is a change which may effect, all or some substance involve in the reactivity , chemically.
The odour, state , colour , molecular composition of substance may change in chemical change.
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