2. A major abiotic factor in fresh- water ecosystems is the
a. source of the water.
b. speed of the water.
C. width of the stream or river.
d. None of the above

9. write the chemical equation for the following word equations. include symbols for physical states in the equation. a. solid zinc sulfide + oxygen gas -> solid zinc oxide + sulfur dioxide gas b. aqueous hydrochloric acid + aqueous barium hydroxide -> aqueous barium chloride + water

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons