Name each activity or observation as either physical or chemical change.
1) boiling water for pasta
2) digesting food
3) soda goes "flat"
4) stretching a rubber band
5) grilling a hamburger
6) adding sugar to tea
7) adding lemon to tea
8) mowing the grass
9) the smell of perfume "wafts" across the room
10) candle wax melts
11) breaking glass
12) making cement
13) lighting a match
14) water is absorbed by a paper towel
15) firefly glows in the dark
16) snow melts
17) bleaching your hair
18) turning on a light bulb
19) milk goes sour
20) shooting off fireworks

1) Boiling water for pasta-> physical
2) Digesting food -> chemical
3) Soda goes "flat" -> physical
4) Stretching a rubber band -> physical
5) Grilling a hamburger -> chemical
6) Adding sugar to tea -> physical
7) Adding lemon to tea -> physical
8) Mowing the grass -> physical
9) The smell of perfume "wafts" across the room -> physical
10) Candle wax melts -> physical
11) Breaking glass-> physical
12) Making cement-> chemical
13) Lighting a match-> chemical
14) Water is absorbed by a paper towel-> physical
15) Firefly glows in the dark-> chemical
16) Snow melts-> physical
17) Bleaching your hair-> chemical
18) Turning on a light bulb-> physical
19) Milk goes sour-> chemical
20) Shooting off fireworks-> chemical

The molecules contain like 54 of water 

The velocity would be 2