The teacher wants us to calculate the ph of natural rainwater. we thought it was 7, but she said to consider water and carbonate species and use chemical equilibrium relationships and electroneutrality (where [h+] = [hco3-] + 2[co3 2-] + [oh-]) to get it. what is the ph and how do we calculate it?

Select the correct text in the passage. the moving continents affect all subsystems on earth. which sentence identifies a potentially negative consequence of shifting continents? the supercontinent pangaea began to break up about 175 million years ago. [during this process, more coastline was exposed as the landmasses separated]. [the rearrangement and displacement of these huge landmasses resulted in the diversity of plants and animals we see on earth today]. [the movement of the plates sometimes leads to earthquakes and tsunamis]. however, over the long course of earth's history, their effects are usually minimal. in oceans, the plate movements usually lead to seafloor spreading. [seafloor spreading often results in the formation of underwater ranges of mountains].

In the late 1990s, brazil’s poor people protested about crowded cities land distribution mining permits industrial pollution

Many areas surrounding the caspian sea contain important a. rare minerals b. forestry resources c. gold and silver mines d. oil and natural gas fields