Can you answer these questions?

I did two science experiment in class, but I can't answer these questions related to the experiments which we did. Here are the two experiments:

Making Hydrogen

Aim: To make and test hydrogen gas

Materials: test tube rack, test tubes, magnesium ribbon, dilute hydrochloric acid, taper and matches, test tube holder

Method:
1. Put a test tube in the test tube rack and one-third fill it with dilute hydrochloric acid.
2. Put the magnesium ribbon into the acid. Use a test tube holder to hold another empty test tube down over the mouth of the first test tube.
3. Ask another person to light a taper. Then remove the top test tube and immediately put the burning taper near its mouth. A 'pop' or 'squeak' indicated that the gas in the tube is hydrogen. You may observe water in the test tube.

These are the discussion questions related.

1. What evidence is there that a chemical reaction occurred in the test tube?
2. After a while no more hydrogen is produced. Why is this?
3. How can you explain the presence of water inside the test tube after you 'pop' the hydrogen?
4. Why did you tilt the test tube upwards before bringing the burning taper near?
5. Suggest why you didn't hold the collecting test tube in your hand when you tested for hydrogen.

This is the second experiment;

Making Oxygen

Aim: To make oxygen gas and test it.

Materials: Manganese dioxide, hydrogen peroxide, 2 test tubes, test tube rack, test tube holder, wooden splint and matches

1. Put a test tube in the test tube rack and one-third fill it with hydrogen peroxide.
2. Put the manganese dioxide into the peroxide. Then use a test tube holder to hold the empty test tube upside down over the mouth of the first test tube.
3. Ask another person to light a wooden splint. The wooden splint will glow in air, but when in the oxygen gas, it will burst into flame.

These are the discussion questions related.

1. Why is it that the splint only glowed in air, but burst into flame in oxygen gas?
2. The black manganese dioxide powder was not a reactant in the reaction. It speeds up the reaction but is not used up. Predict what would happen if you placed the leftover manganese dioxide into a new test tube containing hydrogen peroxide. Give a reason for your answer.
3. In the reaction that produced oxygen, water was also produced. The hydrogen peroxide was used up. Which were the products in the reaction. Which were the reactants?


That's just ten questions. I will do best answer for the best answer. I used to say that on my old questions but didn't realise I was only on level 1, now I'm on level 2, so I can do it for sure. Okay, please answer. If possible, please do about a line or two of the results of each experiment, so about four lines for both experiments.
BEST ANSWER to the person who answers it.