CHM 2045C Study Guide - Final Guide: Nitrous Oxide, Calorimeter, Hydrobromic Acid
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Determine whether each change is physical or chemical. (a) the evaporation of rubbing alcohol (b) the burning of lamp oil (c) the bleaching of hair with hydrogen peroxide (d) the forming of frost on a cold night. Name si unit for length, mass, time, temp. , amount, electric current, luminous intensity. A si(cid:272)k (cid:272)hild has a te(cid:373)perature of 40. 00 c. A man receives a platinum ring from his fianc e. Before the wedding, he notices that the ring feels a little light for its size and decides to determine its density. He places the ring on a balance and finds that it has a mass of 3. 15 grams. He then finds that the ring displaces 0. 233 cm3 of water. Is the ring made of platinum ? (density of platinum = 21. 4) How many significant figures are in each number? (a) 0. 04450 m (c) 10dm=1m (e) 0. 00002 mm (b) 5. 0003 km (d) 1. 000*105 s (f) 10,000 m.
