tell whether each of the following is chemical or physical change and why.?

Question

a.perspiration evaportaing
b.peanut brittle hardening
c.snow turning into water
d.aspartame, a sugar substitue, decomposing when heated
e.sodium metal in contact with chlorine emitting a bright light.
f.making ice cream from sugar and cream
g.dew forming on plants
h.trinitrotoluene explodeing when heated

Answer 1

a. physical - the liquid isnt changing its substance, its just changing its state of matter

b. physical - the peanut brittle just hardens, its substance is not being changed.

c. physical - snow turning to water is again a change in the state of matter. snow is composed of water of course.

d. chemical - the atoms of aspartame are no more when burned so there is no substance left or little substance that was changed in the process.

e. chemical - sodium atoms combust with chlorine atoms to form a new molecule -- Sodium Chloride(NaCl). The substances combusted so its a molecule with both substances.

f. physical - ice cream is only changing state of matter again. once it melts, it will still be ice cream but in a different form.

g. physical - relative humidity reaches dew point (100%) atmospheric moisture condenses as a result of water droplets on the grass and other plants. the substace was never changed.

h. chemical - trinitrotoluene exploding when heated is a chemical reaction like fire burning wood.

Physical Change - A changed in the physical state of matter of the substance, the substance themselves don't change.

Chemical Change - A change of the atoms of the substaces themselves.

So, there you have it.

Answer 2

A. Physical
B. Physical
C. Physical
D. Chemical
E. Chemical
F. Physical
G. Physical
H. Chemical

The question to ask is how are the elements changing? Example: Ice, Water, and Water Vapor are all H2O just changing it's physical state. Where the sodium metal in contact with chlorine is a chemical reaction causing the light.

Answer 3

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Answer 4

a. physical (evaporation of moisture is a physical change)
b. Physical again due to loss of moisture
c. physical (melting is a physical change)
d. chemical (carbon containing substances do undergo chemical changes when heated)
e. chemical (sodium and chlorine react to form sodium chloride)
f. physical (ice cream is a colloidal physical mixture)
g. physical (condensation of moisture)
h. chemical (a chemical reaction)

Answer 5

The usual method is, if you can reverse the change, it is physical and if you can't it is chemical.
e.g. if you rip a piece of paper up, you can pulverise and mush it back up and make it into a sheet of paper again. However if you burnt it, all that would be left would be delicate bits of ash that you could not make back into a sheet of paper!

Answer 6

a)chemical
b physical
c physical
d chemical
e physical
f physical
g physical
h chemical


I'm too drunk to explain why