When a physical change in a sample occurs, which of the following does not change?
a. shape
b. temperature
c. volume
d. composition

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

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How does concentration affect reaction rate