Give an example of a chemical reaction or chemical change for each of the following
situations:
(a) A change in colour is observed.
(b) A gas is evolved.
(c) Sound is produced.
(d) Heat is produced.
(e) Change in taste is observed.
(f) Light is produced.
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Answer:
Give an example of a chemical reaction for each of the following situations:
A change in colour is observed.
A gas is evolved.
Sound is produced.
Formation of precipitate.
Change of state from liquid to gas.
Change of state from gas to liquid.
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Explanation:
The light energy or the photons from the sunlight decompose the molecule. ... Hence, the colour change observed when white silver chloride is left exposed in sunlight is from white to grey and the type of chemical reaction is photolytic decomposition reaction or photolysis.
A gas evolution reaction is a chemical reaction in which one of the end products is a gas such as oxygen or carbon dioxide. Gas evolution reactions may be carried out in a fume chamber when the gases produced are poisonous when inhaled or explosive.
Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. As the particles vibrate, they move nearby particles, transmitting the sound further through the medium.
Heat is produced by matter. Matter is made up of atoms and molecules and energy causes the atoms and molecules to always be in motion. They either bumping into each other or vibrating back and forth to cause energy. Which makes friction, which makes heat.
Nervous system disorders that affect the nerves of the mouth or brain, such as Parkinson's disease, multiple sclerosis (MS), and Alzheimer's disease, may cause a change in the perception of taste. In addition, some non-nervous system disorders, such as cancer, can alter taste perception – especially during treatment.
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