Exam 1: Introduction to Chemistry

Numbers and Measurements A rock is placed on a balance and its mass is determined to be 22.410 g. When the rock is then placed in a graduated cylinder that originally contains 11.34 mL of water the new volume is 17.82 mL. What should the density of the rock be reported as?

Problem Solving in Chemistry and Engineering In the description of the refining of aluminum the molecular scale depiction of precipitation was not included. Use the web to determine what chemicals are involved in the precipitation process and draw a molecular scale drawing of this reaction.