1) Oxygen gas dissolved in water can be used by fish, which remove it from the w
ID: 547620 • Letter: 1
Question
1) Oxygen gas dissolved in water can be used by fish, which remove it from the water by means of their gills. Classify the change that occurs when oxygen dissolves in water.
a. Physical
b. Chemical
c. Can’t tell from the information given
Explain your answer:
2 ) Seawater can be made into drinking water by boiling the seawater, collecting the steam, and condensing the steam to liquid water. Classify the changes in water that occur when it is boiled to steam, and then condensed to liquid water.
a. Both are physical changes.
b. One is a physical change and one is a chemical change. c. Both are chemical changes.
d. Can't be determined from the information given.
Explain your answer:
Explanation / Answer
1)
when oxygen dissolves in water, the chemical formula of neither of them changes. It is just a physical change (gas changing to aqueous)
Answer: a
2)
Boiling is changing liquid to gas which is physical change because only the state is changing. Chemical formula H2O is still intact.
condensation is changing gas to liquid which is physical change because only the state is changing. Chemical formula H2O is still intact.
Answer: a
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