Chemical vs Physical change/property

In summary, the conversation involves identifying whether certain statements describe physical or chemical changes. The correct answers, in order, are PPCPC. The participants discuss their answers and one person notes that the first statement (a) was a bit tricky.
  • #1
kooombaya
36
0

Homework Statement


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.

The Attempt at a Solution


For a) chemical to remove the stain
b)physical
c)physical
d)physical
e)chemical
 
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  • #2
Nevermind I got it.
 
  • #3
What did you get for a?
 
  • #4
I got physical for A.
 
  • #5
Ooh-rah!
 
  • #6
Haha that one was tricky you must admit :)
 

Related to Chemical vs Physical change/property

1. What is the difference between a chemical change and a physical change?

A chemical change is when a substance undergoes a reaction that results in the formation of new chemical substances. This change is usually accompanied by a change in color, odor, or energy. On the other hand, a physical change is when a substance undergoes a change in its physical properties, such as shape, size, or state, without forming any new substances.

2. How can I tell if a change is chemical or physical?

To determine whether a change is chemical or physical, you can observe the properties of the substance before and after the change. If new substances are formed, it is a chemical change. If the substance only undergoes a change in its physical properties, it is a physical change.

3. What are some examples of chemical changes?

Some examples of chemical changes include burning a piece of paper, rusting of iron, and cooking an egg. In these instances, new substances are formed as a result of the chemical reactions.

4. What are some examples of physical changes?

Physical changes include melting an ice cube, cutting a piece of wood, and boiling water. These changes only affect the physical properties of the substance and do not result in the formation of new substances.

5. Can a substance undergo both chemical and physical changes?

Yes, a substance can undergo both chemical and physical changes. For example, when sugar is burned, it undergoes a chemical change as it is transformed into carbon dioxide and water vapor. However, the physical properties of the sugar, such as its color and texture, also change as a result of the heat from the burning.

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