Calculate the percent composition by mass of each of the following compounds. Part A CaCl2, calcium chloride Express your answers using two decimal places. Provide the mass percents for Ca first, then Cl, and separate values with a comma (e. g., 38.55,61.45).

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Pls i will do pls imma diewhat forms white light? (4 points)a. combination of all wavelengths of ultraviolet light b. combination of all wavelengths of visible lightc. absorption of electromagnetic waves d. absorption of infrared rays

The independent variable in an experiment will be the variable that you o a) change ob) hold constant ng c) observe for changes