Analysis questions:

A) What evidence is there that the gas bubbles formed in the first part of the investigation were hydrogen gas?

Answer: Evidence there was that proved that the gas bubbles formed in the first part of the investigation were hydrogen gas is that there was this popping noise and it was igniting.

-I was not quite that sure of what else to add in my answer, so if u could add to this, then I will be very thankful to you.

B) The reaction of zinc metal and hydrochloric acid creates hydrogen gas, an element. what property of this element requires u to keep the second tube upside down.

Answer: Property of this element which requires u to keep the second tube upside down is that it can be reactive depending on the kind of atmosphere around.

C) What evidence is there that the compound formed in the second test tube is water?

C) It is water because appears as a clear liquid.

D) Water has the chemical formula H2O. Where did the hydrogen (H) and oxygen (O) atoms required to form the water molecules come from?

Answer: Not sure.

E) Did the investigation verify ur prediction? Explain.

Answer: Yes, the invesigation verified my prediction becuase it proved that an element van be separated from a compound and that an element can form a compound.

A) What evidence is there that the gas bubbles formed in the first part of the investigation were hydrogen gas?

To provide a more complete answer, you can add:

In addition to the popping noise and igniting, you can look for additional evidence that the gas bubbles formed were hydrogen gas. Some other observations that can support this conclusion include:
1. The gas bubbles being lighter than air and rising rapidly.
2. Effervescence or fizzing when the reaction occurred, indicating the release of a gas.
3. Conducting the "Squeaky Pop Test" by collecting some of the gas in a test tube, and then holding a lit splint near the mouth of the tube. If the gas is hydrogen, it will ignite with a squeaky pop sound.

B) The reaction of zinc metal and hydrochloric acid creates hydrogen gas, an element. What property of this element requires you to keep the second tube upside down?
To provide a more thorough answer, you can add:

Hydrogen gas (H2) is extremely light and has a low density compared to air. Its property of being less dense than the surrounding air causes it to rise. Keeping the second tube upside down creates a barrier, preventing the hydrogen gas from escaping. Because of its low density, if the tube is not inverted, the hydrogen gas would quickly escape, as it is lighter than the surrounding air.

D) Water has the chemical formula H2O. Where did the hydrogen (H) and oxygen (O) atoms required to form the water molecules come from?
To provide a more comprehensive answer, you can explain:

In the context of the investigation, the hydrogen (H) and oxygen (O) atoms required to form the water molecules came from the reactants involved. Water (H2O) is formed through a chemical reaction between hydrogen gas (H2) and oxygen gas (O2). However, in this particular investigation, the water may have been produced through the reaction between the zinc metal and the hydrochloric acid, where hydrogen gas (H2) is one of the products. So, the hydrogen atoms come from the hydrochloric acid (HCl) while the oxygen atoms are from the air, which is typically present in the surroundings.

E) Did the investigation verify your prediction? Explain.
To provide a more complete response, you can elaborate:

Yes, the investigation verified my prediction. My prediction was that an element can be separated from a compound and that an element can form a compound. In the investigation, hydrogen gas (H2) was produced by the reaction of zinc metal and hydrochloric acid, which demonstrated that an element (hydrogen) can indeed be separated from a compound (hydrochloric acid). Additionally, the formation of water indicated that an element (hydrogen) can form a compound (water). Therefore, both aspects of my prediction were confirmed through the investigation.

D) The hydrogen (H) atoms required to form the water molecules came from the hydrochloric acid used in the reaction. The oxygen (O) atom came from the air present in the surroundings.