Answers the following questions:
(a) Keeping food in air tight containers helps in preventing rancidity. Why?
(b) Chip's manufacturers usually flush bags of chips with nitrogen gas. Why?
(c) What is exothermic reaction?
(d) What are the conditions that promote corrosion?
(e) Give one example of a physical change.
Answers
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ANSWER:
1) Keeping food in air tight containers help in preventing rancidity. It does not allow air (oxygen) to come in contact with the food and this prevents oxidation of food. Thus the food never become rancid and its smell and taste remains the same.
2) Potato chip bags are not full of air, but of nitrogen gas. This is done to prevent the chips from oxidizing, which is part of what makes them go stale. Oxygen is very reactive, and likes to combine with other molecules whenever it can, causing chemical changes to take place.
3) Exothermic reaction: The reaction in which heat energy is released after the reaction takes place is called Exothermic reaction.
4) Corrosion is also a chemical reaction in which metal reactions with atmospheric moisture and oxygen gas to form metallic oxides. That is the reason, metals corrode quickly. Metallurgy is the process of conversion of metallic ores to metal as metals are usually found in combined state in nature.
5) Examples of physical changes include crushing a can, melting an ice cube, and breaking a bottle.
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