Acollection of coins contains 15 pennies, 12 dimes, and 7 quarters. what is the percentage of pennies in the collection?
express your answer to two significant figures and include the appropriate units.

What postulate of the kinetic molecular theory best explains why gases have high fluidity? because collisions between gas particles are elastic, there is no loss of energy as particles flow past each other. because gases consist of large numbers of tiny particles, they spread out and do not come in contact with each other. because the attractive forces between gas particles are negligible, gas particles can glide easily past one another. because the average kinetic energy of gas particles increases as temperature increases, gas particles behave more like a liquid. question 6 compare the compressibility of gases and liquids. support your answer by describing the arrangement of particles in gases and liquids.

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

What natural processes produce large quantities of co2