Predict whether S for each reaction would be greater than zero, less than zero, or too close to zero to decide. a. H2(g) + F2(g) → 2HF(g)
b. 2SO3(g) → 2SO2(g) + O2(g)

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.

Measurements that have similar values are: a. usually accurate b. sometimes accurate c. always accurate d. never accurate

Which sample at stp has the same number of atoms as 18 liters of ne at stp