Where on the periodic table can you find elements that typically will “take” two electrons in chemical reactions?

Professor Lawler borrows a spaceship and loads one of the lasers from a physics lab into it. She flies away in a straight line at constant speed going exactly half the speed of light.   As she flies off, she shines a beam of light from the laser back towards the science center and has one of her students measure how fast the light is going. What does the student find?

Which one of these forces is a result of an electromagnetic interaction?

You are given two clear solid crystals and told that only one of them is an ionic material. Both of them dissolve in water. How can you tell which one is the ionic material?

How does the momentum of the dynamite before the explosion compare to the total momentum of all of the pieces immediately after the explosion?

The next two questions deal with this situation: In one early experiment that helped determine the structure of matter, alpha particles were shot at a thin sheet of gold foil. The particles were detected on a screen that could be moved about the room.

Below is a mass spectrum for one of the molecules pictured above. Which molecules produced this spectrum?   

As you stand on the escalator going from one floor to a higher one at constant speed, which of these statements best describes what is happening?

The next two questions deal with this situation: Suppose you are playing baseball and hit the ball with the bat.

How do we measure the mass of planets?