A chemical change is also referred to as a chemical reaction because it involves substances reacting with each other to form new substances with distinct chemical compositions, demonstrating a change at the molecular level.
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Chemical properties undergo alteration during a chemical change as substances react with each other, resulting in the formation of new substances with different chemical compositions.
Burning involves a chemical reaction where a substance reacts with oxygen to produce new substances with altered chemical compositions. This transformation is indicative of a chemical change or chemical reaction.
Chemical properties dictate how substances interact with each other and their environment. In the case of water and cooking oil, their chemical properties determine their odor, inflammability, and behavior in various situations.
Oil burns in air because it undergoes a chemical reaction with oxygen, resulting in combustion. In contrast, water extinguishes fire by smothering it and lowering the temperature, preventing oxygen from reaching the fuel source.
Water and cooking oil differ in odor and inflammability due to their distinct chemical compositions.
A physical change involves a change in the physical state or appearance of a substance without altering its chemical composition, whereas a chemical change involves the formation of new substances with different chemical compositions.
Despite starting with the same materials, the properties of the products obtained by Groups I and II differ because Group I involves a physical change, while Group II involves a chemical change or reaction.
The gas obtained by Group II is hydrogen sulfide. It is a colorless gas with the smell of rotten eggs.
The combustion test for hydrogen involves burning the gas, which can be potentially hazardous due to its flammability. Therefore, it is not advisable to perform this test in a classroom setting.