Notice that " s o 4 " appears in two different places in this chemical equation. s o 2− 4 is a polyatomic ion called "sulfate." what number should be placed in front of cas o 4 to give the same total number of sulfate ions on each side of the equation? ? cas o 4 +alc l 3 →cac l 2 +a l 2 (s o 4 ) 3 express your answer numerically as an integer.

Which example is a mechanical wave?     a.microwave    b.radio wave    c.water wave    d.ultraviolet light

Which of the following is a pure substance? airbloodcopperwood

20 !! 1 a metal has higher reactivity than magnesium. which of the following statements about the location of this metal on the periodic table can be true? a. the metal is to the right of magnesium in the same row. b. the metal is to the left of magnesium in the same row. c. the metal is below magnesium in the same column. d. the metal is above magnesium in the same column.