H2 + O2 → H2O

Why does his teacher ask him to balance the equation by including the correct coefficients?

A. to show that most molecules exist in pairs

b. to show that most compounds exist in pairs

c. to show that atoms are conserved in chemical reactions

d. to show that atoms are created in chemical reactions

Ageologist determines that a sample of a mineral cant 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

When coal has reached it hardest, darkest form, it is called select one: 0 a. sub-bituminous b. lignite c. bituminous d. antrhacite next page

The is an estimate of the fewest number of organisms a population needs to avoid extinction. this measurement will most if the number of offspring each female in the population produces increases. if the population's this measurement will most likely increase. 1 population density, minimum viable population, carrying capacity 2 decrease, be unaffected, increase 3 death rate increase, dead rate decrease