a) breath fogging a mirror
b) bleaching a stain
c)milk souring
2007-01-27 12:43:54 · 9 answers · asked by happy days 1 in Science & Mathematics ➔ Chemistry
A chemical change requires the breaking and/or making of chemical bonds (covalent or ionic). There is a phase change when the moisture in your breath condenses onto the colder mirror and there are chemical forces in play, but no new chemcial bonds are made nor old ones broken
bleaching is an oxidant which means it chemically reacts (oxidizes) with the stain (breaking and making bonds)
milk souring - this is a cheat it is a biological process which involves the growth of bacteria requires both physical and chemical changes (physical such as curdling).
So we may conclude that any chemical change involves a change in the physics but not vice versa.
2007-01-27 12:53:26 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Funny, but I'm studying the same thing right now. And it is physical chemical and chemical.
2007-01-27 20:55:13 · answer #2 · answered by Big Bear 7 · 0⤊ 0⤋
a physical
b chemical
c chemical
2007-01-27 20:48:11 · answer #3 · answered by hundredaire 4 · 0⤊ 0⤋
a) physical change
b) chemical change
c) chemical and physical
2007-01-27 20:53:31 · answer #4 · answered by Charlie 1 · 0⤊ 0⤋
a) physical
b) chemical
c) chemical
2007-01-27 20:48:02 · answer #5 · answered by rfedrocks 3 · 0⤊ 0⤋
physical, chemical, chemical
2007-01-27 20:52:21 · answer #6 · answered by Mr. G 6 · 0⤊ 0⤋
a - physical
b and c - chemical
2007-01-27 20:47:23 · answer #7 · answered by special-chemical-x 6 · 0⤊ 0⤋
a)Physical
b)Chemical
c)Chemical...I Think
2007-01-27 20:52:40 · answer #8 · answered by Pshtt Baby x3 2 · 0⤊ 0⤋
a)physical
b(chemical
c(Physical
2007-01-27 20:47:50 · answer #9 · answered by Anonymous · 0⤊ 0⤋