answer and explanation of 1-5

1. How many significant figures are in the following measurements? a. 45.66km b. 30.0mL 2. A cubed block of wood measures 7.69cm in height, 4.21cm in width, and 5.40cm in depth. Calculate the volume of the wood in units of cm3. Hint: volume = height x width x depth 3. How many milligrams are in 3.44g ? Write your answer in scientific notation. 4. A student used a balance to measure the mass of three vitamin tablets. The reading on the balance was 12.04g. What is the average mass of ONE vitamin tablet? 5. A student measured the mass of a solid to be 45.704g. The volume of the solid is 6.26mL. Calculate the density of this solid. 6. Look up the density of steel, aluminum, copper, brass, PVC (polyvinyl chloride), and acrylic, Be sure to include units in your answers