Question

an example of chemical change is
a) boiling alcohol
b) grinding coffee beans
c) digesting pizza
d) coffee spilled on a shirt
e) an ice cube melting in a drink

Answer 1

Chemical Changes cannot easily be reversed. Can you easily reverse the process of boiling alchohol

Answer 2

no?

Answer 3

idk lol

Answer 4

Chemical Changes usually involve a change of chemical bonds. Does grinding coffee beans involve a change of chemical bonds

Answer 5

i have no idea

Answer 6

What did the teacher say about chemical and physical changes

Answer 7

idk man thats why im asking questions on here. i have no idea

Answer 8

I suggest you take a look at this resource if you were unclear about what the teacher said: http://antoine.frostburg.edu/chem/senese/101/matter/faq/physical-chemical.shtml
I don't think I should just give you the answer

Answer 9

its 2 am im just trying to go to sleep

Answer 10

Chemical Changes usually involve a formation of new chemical substances. At the molecular level, it usually involves bond breaking and formation of bonds. For example, iron rusting is a chemical change which produces iron oxide.

Physical change rearranges molecules but doesn't affect their internal structures. Examples include, boiling water, dissolving sugar etc.

Answer 11

Do you know which one is a chemical change?...

Answer 12

>Physical change rearranges molecules but doesn't affect their internal structures. Examples include, boiling water, dissolving sugar etc.

Based on that, a) boiling alcohol is not a chemical change. It's just vaporization.

Answer 13

b) grinding coffee beans changes the form but not the arrangement of molecules or whatever. It is still coffee. That's physical.

Answer 14

Nothing chemical is changed here:

d) coffee spilled on a shirt

e) an ice cube melting in a drink

That leaves the answer as what?