Question

please solve my question​

Answer 1

Answer:

1. Oxygen — 21 percent. Argon — 0.93 percent. Carbon dioxide — 0.04 percent. Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.

2. Oxygen

3. You will find that the candle blows out after burning for some time, and the water level inside the inverted glass rises to some extent. The component oxygen of air inside the glass is used up in burning. Therefore, water occupies that space. This shows that air supports burning.

4. We can show that air is dissolved in water with the help of following activity: Take some water in a glass or metal container like pan and heat it. Just before water begins to boil, you will notice some bubbles at the inner surface of the pan. ... This shows that air is dissolved in water.

5. A lump of cotton wool has a lot of air trapped inside the space present in its fibres. When this lump of cotton is immersed in water, all the air is replaced by water. Due to this the cotton lump shrinks down.

Answer 2

1. Oxygen - 21%. Argon - 0.93% . Carbon dioxide - 0.04% . Trace amounts of neon, helium, methane , krypton and hydrogen as well as water vapour .
2. Oxygen gas
3. You will find that candle blows out after burning for some time, and the water level inside the inverted gas rises to some extent . The component oxygen of air inside the gas is used up in burning. Therefore,water occupies that space. The shows that air supports burning.
4. We can show that air is dissolved in water with the help of the following activity : Take some water in a glass or metal container like Pan and heat it . Just before water begins to boil, you will notice some bubbles at the inner surface of the pan. This shows that air is dissolved in water .
5. A lump of cotton wool has a lot of air trapped inside the space present in its fibres . Due to this the