Chemical Equations with Physical States Notations

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Questions and Answers

Match the following metals with the type of coating formed due to corrosion:

Iron = Reddish brown powder Copper = Green coating Silver = Black coating Gold = No visible coating

Match the following preventive measures with the corresponding issue they address:

Adding antioxidants to food = Preventing rancidity of fats and oils Keeping food in air-tight containers = Slowing down oxidation of fats and oils Flushing bags of chips with nitrogen gas = Preventing chips from getting oxidized Regularly cleaning metal objects = Preventing formation of corrosion

Match the following descriptions with the correct term:

Process of metals getting tarnished due to substances around them = Corrosion Change in smell and taste of fats/oils due to oxidation = Rancidity Substances that prevent oxidation in food containing fats/oils = Antioxidants Gas used to prevent chips from getting oxidized = Nitrogen

Match the following examples of corroded objects with their material:

Damaged car bodies, bridges, iron railings, ships = Iron Black coating on silver and green coating on copper = Silver and Copper Reddish brown powder on iron articles = Iron No visible coating on gold objects = Gold Signup and view all the answers

Match the following terms with their definitions:

Corrosion = Process where metals are attacked by substances around them like moisture or acids Rancidity = Change in smell and taste of fats/oils due to oxidation Antioxidants = Substances added to food to prevent oxidation in fats/oils Nitrogen gas flushing = Process used to prevent chips from getting oxidized Signup and view all the answers

Define exothermic and endothermic reactions. Provide examples of each.

Exothermic reactions release heat to the surroundings, like combustion. Endothermic reactions absorb heat from the surroundings, like photosynthesis. Signup and view all the answers

Explain why respiration is considered an exothermic reaction.

Respiration is exothermic because it releases energy in the form of heat and ATP during the breakdown of glucose. Signup and view all the answers

Why are decomposition reactions considered the opposite of combination reactions? Provide equations for each type of reaction.

Decomposition reactions involve the breakdown of a compound into simpler substances, while combination reactions involve the formation of a compound from simpler substances. Signup and view all the answers

Differentiate between displacement and double displacement reactions. Write equations for both types of reactions.

Displacement reactions involve an element displacing another in a compound, while double displacement reactions involve the exchange of ions between two compounds. Signup and view all the answers

Explain the process involved in the refining of silver using displacement by copper metal.

In the refining of silver, copper metal displaces silver from silver nitrate solution, forming copper nitrate and elemental silver. Signup and view all the answers

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