Which of the following is an example of observational scientific investigation? a. mixing two reactants together in a small beaker. b. noting the color of a solution when heated. c. placing test tubes in an ice bath for 15 minutes. d. drying solid produced by placing it in an oven.

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?

What is a subatomic particle with a negative charge and very little mass?

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.