Calcium carbonate can break down to form calcium oxide and carbon dioxide. caco3 → cao + co2 the oxygen atoms on the product side are not balanced because there are only two oxygen atoms in co2 not balanced because there is only one oxygen atom in cao. balanced because the total number of oxygen atoms is 3. balanced when a coefficient of 3 is placed in front of co2.

According to the united nations refugee agency, more than 2/3 of the world's refugees come from just five countries. which country is not on that list? a) turkey b) myanmar c) afghanistan d) south sudan

Asimilarity between the governments of israel and iran is that a both are considered democracies b. both are ruled by a prime minister c. both give men and women voting rights d. neither allows political parties to exist

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].