Neon, argon, and krypton are in the same column on the Periodic Table of the Elements.•What characteristic do these elements have in common? •A. atomic mass•B. negative electrical charge•C. number of neutrons•D. full valence electron shells•Answer is D
Which characteristic is common to most metals?
Traveling in opposite directions, buses A and B are passing each other at the relative speed of 15 km/h, while Andres on bus A walks toward the back of the bus at the speed of 5 km/h. What is the velocity of the Andres on bus A relative to bus B? A
A train travels around a track at 100 miles per hour, four observers describe the motion of the same train.•Observer’s Descriptions•1Train is moving to the right at 100mph•2Train is moving to the left at 100mph•3Train is moving away from him at 100mph•4Train is moving towards him at 100mph•What reason best explains the differences in observers’ descriptions?
Student 1 rides in a moving car and observes a bus traveling east. She estimates that it is traveling at a rate of 20 kilometers per hour (km/h). Student 2 is standing on the sidewalk and observes the same bus at the same time. She estimates that it is moving east at a rate of 50 km/h.•Which best explain this difference? •A. velocity varies with the compass direction of motion•B. measurement error causes multiple observations of motion to conflict•C. all motion is relative to the frame of reference chosen for measurement•D. acceleration and velocity have different values because they are different measure of motion.•Answer: C
Certain elements with similar chemical and physical properties are found in the same column in the Periodic Table of the Elements. These chemicals
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