Water provides the for many plants and animals.

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains