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General Chemistry

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Chemical Reactions

Question
9 out of 15
 

Passage 1

Information regarding the amounts of substances that actually react to form the products are of extreme help. Analyzing reactions and having the balanced equations help chemists to determine the correct and optimum proportions of reactants to be used. There are various other factors besides the amount of reactants, which determine the efficiency of reactions.

Experiment 1

Student 1 used 40.5 g of aluminum and 80 g of Fe2O3 for Reaction I. A second student conducted the same reaction with a different amount for one of the reactants. The second student used 40.5 g of aluminum, and 90 grams of Fe2O3. A third student also conducted the same reaction with 54 g of aluminum and the same amount of Fe2O3 used by the first student.

Experiment 2

Reaction II involved the production of Al2O3 from aluminum hydroxide This was done by heating aluminum hydroxide.


Experiment 3


What is the most likely identity of product x?

A Aluminum
B Water
C Hydrogen
D Oxygen

Ans. B To answer this question, you have to use your intuition. The reaction occurs by means of the heat supplied to the aluminum hydroxide, and it is a dehydration reaction. So the most plausible answer is water.

Chemical Reactions Flashcard List

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