What mass of acetylene, C, H,, will be produced from the reaction of 90. g of calcium carbide, CaC,, with water in
the following reaction?
CaC(s) + 2H2O(l) — C, H2(g) + Ca(OH),(s)

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine

1. list three scientific reasons cockroaches may fly.

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together