25.0 mL of 0.160 M Sr(NO3)2 is mixed with 75.0 mL of 0.022 M NaF. A precipitate of SrF2 forms. What is [F-] at equilibrium?

Which position represents spring in the southern hemisphere? a) b) c) d)

Particle model to predict what will happen if a sharp object creates a hole in the soccer ball

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.