In each pair, select a substance that is a better heat conductor. 1. copper wire / wood 3. water / iron
2. water / air 4. iron / glass

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

The experiment was repeated many years later but the gases were mixed in a different type of container. a white solid was obtained which was xenon fluoride. predict whether you think 1) krypton and 2) radon will react with fluorine. explain reasons for your predictions

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.