Transcript 10-09 properties changes review

Determine whether each of the following represents
a physical property or a chemical property.
Vinegar has a pungent odor.
Carbon cannot be decomposed.
Sulfur is a bright yellow.
Sodium chloride is a crystalline solid.
Water does not burn.
Ten mL of mercury is a liquid at 25°C.
Oxygen is not combustible.
Aluminum combines with oxygen to form a
protective oxide coating.
9. The density of water at 4°C is 1.000 g/mL.
10. Hydrogen gas is very flammable.
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2.
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8.
U4-4
Determine whether each of the following represents
a physical property or a chemical property.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Physical (intensive)
Chemical
Physical (intensive)
Physical (intensive)
Chemical
Physical (extensive - 10 mL; intensive liquid at
25°C)
Chemical
Chemical
Physical (intensive)
Chemical
U4-4
State whether each of the following represents a
chemical change or merely a physical change.
1.
2.
3.
4.
5.
6.
7.
The lasagna was baked in the oven for 1 hour.
In the lab, a student mixes 2 mL of ammonium chloride
with 2 mL of hydrochloric acid in a test tube. He
notices that the test tube become cooler.
When potassium iodide and lead(II) nitrate are mixed
together, a yellow solid forms.
A few grams of table salt are placed in a small beaker of
deionized water; the salt crystals “disappear” and the
liquid in the beaker remain clear and colorless.
A copper statue, over time, turns green.
In the lab, a student cuts magnesium ribbon into 1-cm
strips.
25 grams of ice melted at room temperature.
U4-4
State whether each of the following represents a
chemical change or merely a physical change.
Chemical (cooking always indicates
chemical)
2. Chemical (indicator: change in energy)
3. Chemical (indicators: change in color and
formation of precipitate)
4. Physical (forms mixture not a new
substance)
5. Chemical (indicator: change in color)
6. Physical (changes size not composition)
7. Physical (phase changes are always physical)
1.
U4-4