To what category of elements does an element belong if it is a poor conductor of electricity

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.

Find the mass in grams of 1.37x1020 particles of h3po4

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?