Apuddle of water on the porch disappears after a few days. which statement justifies this phenomenon?
water loses energy to the atmosphere and is converted to steam.
water loses energy and freezes to ice, which is transparent.
water gains energy from sunlight and is converted to vapor.
water gains energy from sunlight and freezes to ice.
water loses energy causing the water molecules to shrink and disappear.
nextreset

Suppose a pair of chemical compounds a and b can react in two different ways: a + b -> c reaction 1 gives product c. a + b -> d reaction 2 gives product d. the following facts are known about the two reactions: . reaction 1 is endothermic and reaction 2 is exothermic. if a reaction vessel is charged (filled) with a and b , then at first d is produced faster than c. use these facts to sketch a qualitative reaction energy diagram for both reactions. note: because these sketches are only qualitative, the energies don? t have to be exact. they only have to have the right relationship to each other. for example, if one energy is less than another, that fact should be clear in your sketch.