1) the density of gold is 19.3g/cm3. what is the mass of 15 cm3 of gold? 2) You have a graduated cylinder containing 20 ml of water. you add 250 g of lead weights, and the volume of water in the graduated cylinder rises to 42 ml. What is the density of the lead?

3) A drinking glass at a crime scene contains a clear, colourless liquid that may be water or alcohol. As the investigator, you know that the densities of alcohol, water and ice are 0.79g/ml, 1.0 g/ml and 0.92g/ml, respectively. Design a simple method to determine the identity of the mystery liquid. Explain your design.