Describe two observations you might make when a chemical change takes place

Is ethane polar or nonpolar

A blue car is turning left on a road and a purple car is turning right onto the same road. who has the right of way? A. the blue car B. the purple car C. both cars D. neither car

Which is more metallic a) Silicon b) Aluminum

What is kinetic molecular theory

Josh prepares a solution by mixing sodium nitrate and water. To calculate the molarity of the solution, Josh should calculate the moles of which substance, and why?

Which terms most precisely describes the cellular process of breaking down large molecules into smaller ones?

A gas in a rigid container is heated so that it's kelvin temperature doubles. What happens to its pressure

Common cause of biological contamination

Whcih kind if material would best accomplish this task

List at least two chemical reactions that resulted in a yellow, orange, or red precipitate. For these reactions, list the possible chemical name of the precipitate.