Give two examples to show that we observe changes by their effects
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If a chemical change occurs there is anew substance is formed.
Like when we add iron in copper
4.Production of Heat and Light
5. Evolution of gas.
Germination of seed is a chemical change because seeds are dry before germinating but when they are fully germinated then they are wet and a plant like structure called sprout appears upon it Hence a new substance is formed that's why it is a chemical reaction. IHope this would help you slit dude.
4.4. ppze
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