1. List an example of a fast chemical change, 2. Example of a colour and a chemical change accompanied by release of heat. 3. chemical change accompanied by change in?
Answers
1.
An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen. So much energy is released that the hydrogen gas released spontaneously burns in the air
2.
A change in color is also another characteristic of a chemical reaction taking place. For example, if one were to observe the rusting of metal over time, one would realized that the metal has changed color and turned orange. This change in color is evidence of a chemical reaction.
3.
Chemical changes are accompanied by changes in energy.
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the process by which green plants turn carbon dioxide and water into food using energy from sunlight
सूर्य के प्रकाश से हरे पौधों द्वारा कार्बन डाइ-ऑक्साइड और जल को भोजन का रूप देने की प्रक्रिया; प्रकाश-संश्लेषण; फ़ोटोसिंथीसिस