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Authoritative PPT Summary
"Oxygen" The air around us PPT courseware
learning target
1. Know the main physical properties of oxygen.
2. Observe and describe the combustion phenomenon of sulfur, charcoal, and iron wire in oxygen, and summarize the chemical properties of oxygen.
3. Know why combustibles burn more violently in oxygen than in air.
Learning task one
Physical properties of oxygen:
It is a ______ gas, ______ is soluble in water
Density______air
Density of oxygen =1.429g/L
Density of air =1.293g/L
Cool to -183℃ and turn into light blue liquid (liquid oxygen)
-218℃ turns into light blue solid (oxygen solid)
Learning task two
Insert the wooden stick with sparks into the gas collecting bottle, and the wooden stick will re-ignite, proving that it is oxygen.
Learning task three
Experimental Exploration: Chemical Properties of Oxygen
1 Sulfur burns in air and oxygen
2 Charcoal burns in air and oxygen
3 The iron wire burns red hot in the air and in oxygen
Apply what you learn
1. Which statement about the physical properties of oxygen is correct ( )
A. Very soluble in water
B. Under standard conditions, the density is slightly higher than that of air.
C. It turns into a colorless liquid at -183°C.
D. It turns into a white solid at -218℃
2. The simplest way to prove that the gas collecting bottle contains oxygen is ( )
A. What makes candles burn is oxygen
B. Determine the density. If the density is greater than that of air, it is oxygen.
C. Insert the wooden stick with sparks into the gas collecting bottle, and the wooden stick will re-ignite.
D. Add red charcoal and then add clear lime water. The bottle that can make the lime water turbid must be oxygen.
3. What happens when thin iron wire burns in oxygen? ( )
A. Produces a dazzling flame, produces a black solid, and releases heat
B． Burns violently, sparks are emitted, black solid is produced, and heat is released
C. Iron wire red hot, melting
D． Produce blue flame, generate black solid, release heat
A classmate took a piece of thin iron wire from a screen window and did an experiment of "iron wire burning in oxygen" in the oxygen he collected. As a result, no "mars radiating" phenomenon was observed. Could you please analyze the possible reasons why this experiment failed?
1. As soon as the match is lit, put the wire in. The burning of the match consumes most of the oxygen in the bottle.
2. Put the iron wire in after the match has burned out. The temperature of the iron wire is too low.
3. The concentration of oxygen is not enough
4. There is rust on the surface of the iron wire
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