Geologists discover what seems to be a new, powdery substance, deep underground. When they analyze it it's found to contain, amongst other things, potassium and iodine. Which of the following are ruled out about this substance?

A. It is a mixture

B. It is a compound

C. It has a lattice structure

D. It is made up of molecules

E. It is an element

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

4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s. circle one: ke / gpe / both show your work for finding the values of each type of energy the object has:

One nanometer is equal to how many meters?