Write the following numbers in scientific notation. (Please make it E-Notation form) Will mark branliest

What can be added to the examples section of each circle? endothermic: ice melting into water, and a heat pack becoming warm exothermic: a glow stick glowing, and fireworks exploding endothermic: ice melting into water, and an instant ice pack turning cold exothermic: fireworks exploding, and gasoline burning endothermic: a glow stick glowing, and a heat pack becoming warm exothermic: an instant ice pack turning cold, and ice melting into water endothermic: gasoline burning, and an instant ice pack turning cold exothermic: ice melting into water, and an instant ice pack turning cold

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %