Which of the following describes an investigation to determine a chemical property? A Measuring the density of a sample of balsa wood
B Determining the melting point of lead
C Measuring the boiling point of sugar water
D Determining the reactivity of baking soda and vinegar

Which source would provide the most bias-free information about smoking and increased health risks? a) a website created by heart disease patients b) a research study conducted by the mayo clinic eliminate c) a public service message sponsored by tobacco companies d) an online question forum conducted by attorneys for cardiac specialists