B. Caffeine has an empirical formula of C4H5N20 and a molar mass of 194 g/mol. What is its molecular formula? (3 points)

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Which statement best describes the function of enzymes?

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.