CHEM120 Final: Chem 120 Practice Final

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Number of exam pages (including the cover & data sheets) 001, 002, 003, 004, 005: bissonnette, s. forsey, d. gilbert, t. mcmahon tba tba. 3 hours (note: your exam is only 2 hours!) Laptop or notebook computers are not permitted: this examination booklet and the data sheet must be returned, attempt all 30 questions. Chem 120: sample exam questions: methane (ch4) reacts with oxygen (o2) to give carbon dioxide (co2) and water (h2o). Page 2 of 17: a compound contains only the elements carbon and hydrogen. When a 1. 000-g sample of this compound is burned in excess oxygen, 3. 296 g co2 and 0. 899 g h2o are obtained. Chem 120: sample exam questions: a sample of mgcl2 is known to be contaminated with nacl. A 3. 47-g portion of the sample is dissolved in water and treated with an excess of agno3 solution. The precipitate is filtered off, dried and weighed.