STC 112 Theory Questions: Thermite Reaction, Percent Yield, and Stoichiometry Concepts

100 Level Science Technology Department exam questions and detailed answers. Download the answers in document format. Correct, detailed, and straightforward answers.

Questions:

a. Thermite is a mixture of iron (iii) oxide and aluminum powders. It undergoes a spectacular reaction to yield solid aluminium oxide and molten iron.

i. How many grams of iron form when 135g of aluminium reacts?

ii. How many atoms of aluminium react for every 1.00g of aluminium oxide formed?

b. Silicon carbide (SiC) is made by allowing sand (Silicon dioxide, SiO22​) to react with powdered carbon at high temperature. Carbon (II) oxide is also formed. When 100kg of sand is processed 51.4kg of SiC is recovered. What is the percent yield of SiC from this process?

c. Write short notes on the following

d. Stoichiometrically equivalent molar ratio.

e. Chemical equation

f. A balanced chemical equation.

 

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