PDF chapter test TRY NOW
Very short answer questions:
1. Two glass jars A and B are filled with carbon dioxide and oxygen gases, respectively. In each jar a lighted candle is placed simultaneously. In which jar will the candle remain lighted for a longer time and why?
, the candle remains lit longer because supports combustion. So, oxygen (air) is necessary for combustion to take place.
2. Anu wants to boil water quickly in a test tube. On observing the different zones of the flame, she is not able to decide which zone of the flame will be best for boiling water quickly. Help her in this activity.
Anu should hold her test tube in the or non-luminous zone of the flame because it is the hottest zone and has more temperature.
In the zone of a flame, the fuel's complete combustion occurs due to plenty of air around it, so water in a test tube will boil fast in this zone.
In the zone of a flame, the fuel's complete combustion occurs due to plenty of air around it, so water in a test tube will boil fast in this zone.
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