Chemical reactions happen when . a. atoms attract or repel one another b. heat is created by friction c. two or more substances are mixed substances are heated or d. cooled

Jewelweed, a flowering plant, has seed pods that burst open when touched and forcefully eject their seeds. these structures are favorable because they a. can cause genetic changes to occur. b. prevent germination within the seed pod. c. aid in the dispersal of the species. d. attract insects that aid in pollination.

Is laundry detergent an acid or a base?

Based on its chemical properties, identify the position of each chemical family on the periodic table.