Scientists are working with a liquid that is made of only one type of atom. which statement correctly describes this liquid? check all that apply
1. the liquid contains only one compound
2. the liquid contains only one element
3. the liquid contains only neutral electrons
4. the liquid is a pure substance
5. the liquid can be broken down into simpler substances
6. the liquid must have equal numbers of neutrons and protons

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false