Connor turns on a hair dryer to style his hair in the morning. Which choice identifies all of the energy transformations in the system? electrical -- heat sound, and motion
electrical -- sound and motion
heat-electrical and sound
heat and sound -motion

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

Different isotopes indicate that an element will have different numbers of

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025