Water evaporates from a lake into the atmosphere, where it crystallizes. What causes the water to fall back to Earth as snow? A. Condensation
B. Gravity
C. Evaporation
D. Transportation

Write a hypothesis that answers the lesson question, “while observing a chemical reaction, how can you tell which reactant is limiting? ” hypothesis: if a substance is the limiting reactant, then . . because . .

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17