kooombaya
Apr11-10, 04:29 PM
1. The problem statement, all variables and given/known data
5. [1pt]
For each of the following, indicate whether the statement describes a physical (P) or a chemical (C) change. Answer, in order, with a single string, e.g. CPCPC -- NO SPACES, NO PUNCTUATION.
a) A grease spot is removed with cleaning fluid.
b) Sodium chloride (salt) is obtained from salt water by evaporation of the water.
c) Ski goggles become fogged.
d) A snowball melts.
e) Heated oil smokes and turns brown.
3. The attempt at a solution
For a) chemical to remove the stain
b)physical
c)physical
d)physical
e)chemical
5. [1pt]
For each of the following, indicate whether the statement describes a physical (P) or a chemical (C) change. Answer, in order, with a single string, e.g. CPCPC -- NO SPACES, NO PUNCTUATION.
a) A grease spot is removed with cleaning fluid.
b) Sodium chloride (salt) is obtained from salt water by evaporation of the water.
c) Ski goggles become fogged.
d) A snowball melts.
e) Heated oil smokes and turns brown.
3. The attempt at a solution
For a) chemical to remove the stain
b)physical
c)physical
d)physical
e)chemical