A student heats up solid X. it starts to melt at 35°c, and finishes melting at 40°C. what does this tell you about solid X. a. solid X is a pure compound
b. solid X is a pure element
c. solid X is an impure substance
d. solid X is an impure compound​

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

How does a noncompetitive inhibitor reduce an enzyme’s activity?

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules