“Why is the sky blue?” “Why can I sometimes see the moon during the day?” “Why do birds fly south in the winter?”

Have a pro golfer hit each ball 10 times and measure the distance. Ask golfers which ball travels farthest. Compare the tests performed by each company. Have a machine hit each ball with equal force and measure the distance traveled by each ball.

What are atoms and chemical elements? 2 How are substances represented by chemical formulas and models? 3 Identify chemical formulas for ball-and-stick models 4 Describe the atomic composition of molecules