Jake began an experiment when his teacher was not in the room. he gathered all his materials and chemicals he would need with his bare hands. when his nose begins to itch, he reaches up to scratch it, causing a severe reaction. 1) how could the scenario have been prevented? 2) how should the student respond in the scenario to minimize the harm? (3 points - you will earn 1 point for using rare) *

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

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

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?