19. according to the first law of thermodynam...
19. according to the first law of thermodynamics, energy:\ncan be created and destroyed\ncannot be created or destroyed, only transferred\nis always lost during transfer\nis constantly increasing in the universe\n\n20. how can the steepness of a slope be determined on a topographic map?\nby the color of the contour lines\nby the distance between contour lines\nby the thickness of the contour lines\nby the direction of the contour lines\n\n21. what is the appropriate response to a chemical spill in the lab?\nclean it up yourself\nignore it\nreport it immediately to the teacher\nleave the lab
Answer
# Answer:
19. B. Cannot be created or destroyed, only transferred
20. B. By the distance between contour lines
21. C. Report it immediately to the teacher
# Brief Explanations:
19. The first - law of thermodynamics states energy conservation.
20. Closer contour lines mean steeper slope.
21. Safety protocol in lab for spills is to report to teacher.