Do these Experiments and fill in the table:
Can you please help me
Answers
Answer:
in first experiment it is there atmospheric pressure acting on the glass from every side that is why when the water whan filled till tip it had removed the air in it .hence the water didn't fall off.
in second it is air filled in the bottle that's why when it was opposed to water the air had came out of it as air bubbles.
in third the balloon as will burst show us that air has weight as it will hung up while other one will not.
last shows that oxygen is necessary for burning.
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Answer:
Observations of first one is that the index card does not fall
because of the pressure of air outside the plastic cup is pushing the card up
second one don't know
third one On lifting the scale it says horizontial but when the one of the ballon will brust it stays vertically because the intact ballon has air inside it which makes it heavier and hence rod tilt towards it
last one the candle that is exopsed to air and continues burning whereas candle covered in jar burn for short time this shows the oxygen is essential for burning