Afire is burning in a fire place where is the convection
a. you touch the warm bricks next to the fireplace
b. the fire heats the bricks at the bottom of the fireplace
c. heat is rising up the chimney

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

When an object is heated it contracts. a. true b. false

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