write activity of class 8 chapter 6 activity 6.4 science.
please send kare dho
Answers
Answer:
Activity 6.4
(Caution: Be careful while handling burning candle. )
Make two paper cups by folding a sheet of paper. Pour about 50 mL of water in one of the cups. Heat both the cups separately with a candle (Fig. 6.5). What do you observe?
combustion and flame ignition of paper cup with and without water
What happens to the empty paper cup? What happens to the paper cup with water? Does water in this cup become hot?
If we continue heating the cup, we can even boil water in the paper cup.
Can you think of an explanation for this phenomenon.
Answer
Paper cup which contains water do not burns and paper cup which does not contain water starts burning quickly.
Paper cup which contains water do not burn till water is vapourised. This happens because heat introduced to paper cup containing water, goes to water. Additionally water keeps the ignition temperature of the paper cup below limit. This the cause that paper cup containing water does not burn.
On the other hand paper cup having no water, reached its ignition temperature required to burn paper quickly and it starts burning.
Explanation:
brainliesst took a long time
Answer: camphor | yes | black
answer2: limestone | yes | black, white, brown