Q26 E
Question
Classify the six underlined properties in the following paragraph as chemical or physical:
Fluorine is a pale yellow gas that reacts with most substances. The free element melts at -2000C and boils at -188 °C. Finely divided metals burn in fluorine with a bright flame. Nineteen grams of fluorine will react with 1.0 gram of hydrogen.
Step-by-Step Solution
Verified Answer
Physical, Chemical, Physical, Physical, Chemical and Chemical respectively.
1Understanding what is physical and chemical change
Physical change is a type of change in which physical structure changes but chemical composition does not change.
Chemical change is a change in which chemical composition of a substance changes.
2Analyzing underlined properties one by one
- Gas – A physical state of matter
- Reacts with most substances – Chemical property because reaction is required to check reactivity
- Melts at -2000C – A physical property as no chemical reaction is required
- Boils at -1880C – A physical property because boiling shows change of state
- Metals burn in fluorine – A chemical property as chemical reaction is required
- Nineteen grams of fluorine will react with 1.0 gram of hydrogen – A chemical property as chemical reaction is being done
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