The density of lead is 11.4 g/cm3 at 20°c. a chemist has a metallic sample that is either pure lead or mostly lead. if the density of the sample is 11.0 g/cm3 at 20°c, then the sample most likely is

a. pure lead
b. lead mixed with heavier substances
c. lead mixed with lighter substances

Sarah wants to know where in her garden chamomile would grow the best. she thinks chamomile will grow best in the corner of the garden that gets the most sunlight. to test her hypothesis, she decides to plant several groups of chamomile in her garden as an experiment. which of the following variables will sarah need to measure to know which group of plants grew best? a. the location of the plants b. the type of plants c. the height of the plants d. the amount of water she gives the plants

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Is the idea of spontaneous generation supported by redi's experiment? justify your answer in 2-3 sentences?